MAXIM MAX349/MAX350 handbook
Contents
1. 0 3V 17 SCLK CS DIN DOUT RESET 0 3V to V 0 3V COME aan nena an V 2V to V 2V Continuous Current into Any Terminal 30mA Peak Current NO or COM pulsed at 1ms 10 duty 100mA Continuous Power Dissipation 70 C 18 Pin Plastic DIP derate 11 11mW C above 70 889mW 18 Pin SO derate 9 52mW C above 70 762mW 20 Pin SSOP derate 8 00mW C above 70 C 640mW 18 Pin CERDIP derate 10 53mW C above 70 C 842mW Operating Temperature Ranges MAX349C 50 __ 0 C to 70 C 49 5 40 C to 85 C MAX349M__ MAX350M__ 155 C to 125 C Storage Temperature Range 65 C to 150 C Lead Temperature soldering 10sec 300 C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied Exposure to absolute maximum rating conditions for extended periods may affect device reliability ELECTRICAL CHARACTERISTICS Dual Supplies V 4 5V to 5 5V V 4 5V to 5 5V Ta to Tmax unless otherwise not2. Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product No circuit patent licenses are implied Maxim reserves the right to change the circuitry and specifications without notice at any time 20 Maxim Integrated Products 120 San Gabriel Drive Sunnyvale CA 94086 408 737 7600 1998 Maxim Integrated Products Printed USA ALAXLM is registered trademark of Maxim Integrated Products
3. 120 0 01 10k 100k 10M 100M 16 10 00 k 10k FREQUENCY Hz FREQUENCY Hz 12 MAKIM Serially Controlled Low Voltage 8 Channel Dual 4 Channel Multiplexers Pin Description PIN MAX349 MAX350 NAME FUNCTION DIP SO SSOP DIP SO SSOP 1 1 1 1 SCLK Serial Clock Digital Input 2 2 2 2 V Positive Analog Supply Voltage Input 3 3 3 3 DIN Serial Data Digital Input 4 4 4 4 GND Ground Connect to digital ground Analog signals have no ground reference they are limited to V and V 5 5 COM Common Analog Switch mux output 6 13 6 9 11 14 NOO NO7 Normally Open Analog Switch Inputs 0 7 5 5 COMA Common Analog Switch A mux output 6 9 6 9 Normally Open Analog Switch A Inputs 0 3 10 13 11 14 Normally Open Analog Switch B Inputs 0 3 14 15 Common Analog Switch B mux output 14 10 15 16 10 16 N C No Connect not internally connected 15 17 15 17 v Negative Analog Supply Voltage Input Connect to GND for single supply operation 16 18 16 18 DOUT Serial Data Digital Output Output high is V sre RESET Input Connect to logic high or V for normal operation 17 19 ig 13 RESET Drive set all shift reg ios to 0 18 20 18 20 CS Chip Select Digital Input Figure 1 Note NO and COM pins are identical and interchangeable Either may
4. As r r oi mi ocioluw 2 MOLD FLASH OR PROTRUSIONS NOT TD TITLE EXCEED 15mm 006 5 PACKAGE OUTLINE SSOP 5 3X 65mm 3 CONTROLLING DIMENSION MILLIMETER 21 0056 AREE AERA f N 11 mn 0 8 IHE 1 043 3 s Al INCHES MILLIMETERS INCHES MILLIMETERS MIN MIN MIN MIN N_ MSO13 0 093 0 104 2 2 65 10 398 10 413 110 10 10 50116 AA 1 0 004 0 012 0 30 10 447 10 463 11 35 111 75 18 0 014 0 019 0 49 D 10 496 10 512 1182 60 13 00120 0 009 0 013 0 32 D 10598 14 115 20115 601241 AD 0 050 BJ D 10 697 10 713 117 70118 10 28 AE E 0 291 0 299 7 40 7 60 H 0 394 0 419 10 00 10 65 1 D amp E DD NOT INCLUDE MOLD FLASH h 0 010 0 030 0 25 0 75 8 MOLD FLASH OR PROTRUSIONS NOT L 0 016 0 050 0 40 11 27 3 LEADS BE CHPLANAR WITHIN 102mm C004 CONTROLLING DIMENSION MILLIMETER MEETS JEDEC 5013 AS SHOWN IN ABOVE TABLE 6 N NUMBER OF PINS ZVLAXCLAVI PACKAGE FAMILY OUTLINE SOIC 300 PA ETE R 7 on 21 0042 mv
5. 5V to 5 5V V OV TA TMIN to TMAx unless otherwise noted Typical values are at Ta 25 C MIN TYP MAX PARAMETER SYMBOL CONDITIONS Note 1 UNITS SWITCH DYNAMIC CHARACTERISTICS 25 C 160 400 Turn On Time From rising edge of CS CEM 500 ns Ta 25 C 60 200 Turn Off Time tOFF From rising edge of CS CEM 300 ns Break Before Make Delay BBM From rising edge of CS Ta 25 C 15 ns Charge Injection Note 4 VCTE 1nF Vyno OV Rs 00 TA 25 C 1 10 RL 500 15pF Off Isolation Note 6 Viso VNo 1Vams f 100kHz TA 25 C gt 90 dB Channel to Channel Crosstalk RL 500 15pF TA 25 C lt 90 dB Note 7 VNo 1 f 100kHz MAXIM Serially Controlled Low Voltage 8 Channel Dual 4 Channel Multiplexers TIMING CHARACTERISTICS Single 5V Supply Figure 1 V 4 5V to 5 5V V Ta TMIN to Tmax unless otherwise noted Typical values are at Ta 25 C PARAMETER SYMBOL CONDITIONS MIN MAX UNITS SERIAL DIGITAL INTERFACE SCLK Frequency C E M 0 2 1 MHz Cycle Time Note 4 tcH tcL 480 ns CS Lead Time Note 4 tess C E M 240 ns CS Lag Time Note 4 icsH2 C EM 240 ns SCLK High Time Note 4 tCH C E M 190 ns SCLK Low Time Note 4 tcL 190 ns Near D
6. B V 5V V 0V 40 3 30 2 g 2 6 2 10 j 41 lt 10 2 20 3 30 4 40 5 50 5 4 3 2 1 0 2 3 4 5 0 2 4 6 8 V SUPPLY VOLTAGE V MAKIM gt gt OSEXVIW 6VEXVIN 49 50 Serially Controlled Low Voltage 8 Channel Dual 4 Channel Multiplexers Typical Operating Characteristics continued V 5V V 5V GND OV Ta 25 C unless otherwise noted DATA SETUP TIME vs POWER SUPPLY CURRENT MINIMUM SCLK PULSE WIDTH vs POSITIVE SUPPLY VOLTAGE vs TEMPERATURE e MAXO49 250 TOC10 POSITIVE SUPPLY VOLTAGE MAXG49 350 TOC2 l 83 SCLK ns DATA SETUP TIME ns DA e 0 2 4 6 8 0 2 4 6 8 SUPPLY VOLTAGE V TEMPERATURE C SUPPLY VOLTAGE V TOTAL HARM ONIC DISTORTION FREQUENCY RESPONSE vs FREQUENCY 20 100 B Vt 51 8 0 7 6000 IN AND OUT 8 45V 10 20 50W IN AND OUT 20 22 g 40 40 5 60 80 s m 100 100
7. PARAMETER SYMBOL CONDITIONS MIN TYP Note 1 ANALOG SWITCH Analog Signal Range Vcom VNO C E M V V V V 5V V 3 5V TA 25 C 125 175 COM NO On Resistance RON wal CEM 225 Q Y 25 0 1 0 002 0 1 on 20 5 5 Off Leakage Current 10 10 nA Notes 4 5 T TT Ta 25 C 0 1 0 002 0 1 WO 45V 00000 GE is M 10 10 TA 25 C 0 1 0 002 0 1 MAX349 C E 10 10 uad M 100 100 0 Ta 25 C 0 1 0 002 0 1 MAX350 C E 5 5 COM Off Leakage Current 50 50 Notes 4 5 Ta 25 C 0 2 0 002 0 2 MAX349 C E 10 10 M 100 100 VNo 4 5V 25 0 2 0 002 0 2 MAX350 5 5 M 50 50 Ta 25 C 0 2 0 01 0 2 MAX349 C E 10 10 COM On Leakage Current ee 100 100 Notes 4 5 4 5V 25 0 2 0 02 0 2 MAX350 5 5 M 50 50 DIGITAL I O 11 13 Nah CLEM y C EM v TL 2 4V C E M 1 HA DOUT Output Voltage Logic High VDOUT IDOUT 0 8mA C E M 2 8 V V DOUT Output Voltage Logic Low VDOUT IDOUT 1 6mA C E M 0 0 4 V SCLK Input Hysteresis SCLKHYST C E M 100 mV POWER SUPPLY V Supply Current eU SOUND 2 425 E gt uA MAXIM 5 OSEXVW 6VEXVIN 49 50 Serially Controlled Low Voltage 8 Channel Dual 4 Channel Multiplexers ELECTRICAL CHARACTERISTICS Single 5V Supply continued V 4
8. 10pF Fall Time of DOUT Note 4 te e 100 ns 10pF Allowable Fall Time at DIN SCLK 20 of V to 70 of V CEM 2 us Note 4 CL 10pF RESET Minimum Pulse Width tRW TA 25 C 70 ns Note 1 The algebraic convention is used in this data sheet the most negative value is shown in the minimum column Note 2 ARON RON max RON min On resistance match between channels and on resistance flatness are guaranteed only with specified voltages Flatness is defined as the difference between the maximum and minimum value of on resistance as measured over the specified analog signal range Note 3 Leakage parameters are 100 tested at maximum rated hot temperature and guaranteed by correlation at room temp Note 4 Guaranteed by design Note 5 Leakage testing at single supply is guaranteed by testing with dual supplies Note 6 See Figure 6 Off isolation 2010010 VcoM VNO Vcom output NO input to off switch Note 7 Between any two switches See Figure 3 aS a MAXIA Serially Controlled Low Voltage 8 Channel Dual 4 Channel Multiplexers ELECTRICAL CHARACTERISTICS Single 5V Supply V 4 5V to 5 5V V Ta TMIN to Tmax unless otherwise noted Typical values are at Ta 25 C
9. 19 0451 Rev 1 10 98 Serially Controlled Low Voltage 8 Channel Dual 4 Channel Multiplexers General Description The MAX349 MAX350 are 8 channel and dual 4 channel serially controlled multiplexers muxes These muxes conduct equally well in either direction On resistance 100 max is matched between switches 10 16Q max and is flat 100 max over the specified signal range These CMOS devices can operate continuously with dual power supplies ranging from 2 7V to 8V or a sin gle supply between 2 7V and 16V Each mux can handle rail to rail analog signals The off leakage current is only 0 1nA at 25 C or 5nA at 85 C Upon power up all switches are off and the internal shift registers are reset to zero The serial interface is compatible with SPI QSPI and MICROWIRE Functioning as a shift register it allows data at DIN to be clocked in synchronously with the rising edge of clock SCLK The shift register s output DOUT enables several MAX349s or 505 to be daisy chained All digital inputs have 0 8V or 2 4V logic thresholds ensuring both TTL and CMOS logic compatibility when using 5V supplies or a single 5V supply Applications Industrial and Process Control Systems ATE Equipment Networking Serial Data Acquisition Systems Avionics Audio Signal Routing Features SPI QSPI MICROWIRE Compatible Serial Interface 8 Separately Controlled SPST Switches Single 8 to 1 Mux
10. 4 tcss C E 240 ns CS Lag Time Note 4 tCSH2 C E M 240 ns SCLK High Time Note 4 tCH C E M 190 ns SCLK Low Time Note 4 tcL C E M 190 ns Minimum Data Setup Time Note 4 ips C E M 38 120 ns Data Hold Time Note 4 tDH 38 ns DIN Data Valid after Falling SCLK t 5096 of SCLK to 1096 of TA 25 C 150 Note 4 De DOUT CL 10pF C E M 400 Rise Time of DOUT Note 4 tbR 20 VETO TOGENE 100 ns 10pF Allowable Rise Time at DIN t 20 of V to 70 of V CEM 2 5 SCLK Note 4 SCR CL 10pF m H Time of DOUT Note 4 C EM 100 ns 10pF Allowable Fall Time at DIN SCLK t 20 of V to 70 of V CEM 2 5 Note 4 ack CL 10pF H RESET Minimum Pulse Width 6 Note 4 tRW TA 25 C 105 ns Note 1 The algebraic convention is used in this data sheet the most negative value is shown in the minimum column Note 2 RoN max RON min On resistance match between channels and on resistance flatness are guaranteed only with specified voltages Flatness is defined as the difference between the maximum and minimum value of on resistance as measured over the specified analog signal range Note 3 Leakage parameters are 100 tested at maximum rated hot temperature and guaranteed by correlation at room temp Note 4 Guaranteed by design Note 5 Leakage testing at single supply is guaranteed by testing with dual supplies Note 6 Se
11. AY BE USED FOR DATA ECHO PURPOSES Figure 4 Connections for SPI and SCLK MAXIM MAX349 pin MAX350 pout TO OTHER SERIAL DEVICES MAXIM Serially Controlled Low Voltage 8 Channel Dual 4 Channel Multiplexers 49 SCLK MAX350 Figure 6 Addressable Serial Interface Figure 7 Differential Multiplexer Input Control Power Supply Considerations Overview The MAX349 MAX350 construction is typical of most CMOS analog switches It has three supply pins V V and GND V and V are used to drive the internal CMOS switches and they set the limits of the analog voltage on any switch Reverse ESD protection diodes are internally connected between each analog signal pin and both V and V If any analog signal exceeds V or V one of these diodes will conduct During normal operation these and other reverse biased ESD diodes leak forming the only current drawn from V or V MAKIM MAXIM scLk MAX350 TO OTHER gt SERIAL DEVICES CS MAXIM MAX349 scLk MAX350 MAX349 Virtually all the analog leakage current is through the ESD diodes Although the ESD diodes on a given sig nal pin are identical and therefore fairly well balanced they are reverse biased differently Each is biased by either V or V and the analog signal This means their leakages vary as the signal varies The difference in the two diode leakages to the V and V pins constitutes the analog signal path leakage curren
12. D4 D3 D2 Di 1 1 CLOCKED IN 1 LSB INPUT DATA BITS DATA OUT oom 8888666 06 D5 D4 D3 D2 D1 DO DATA BITS FROM PREVIOUS DATA INPUT DOUT POWER UP DEFAULT 07 00 0 Figure 2 3 Wire Interface Timing MAXIM Serially Controlled Low Voltage 8 Channel Dual 4 Channel Multiplexers Table 1 MAX349 Serial Interface Switch Programming DATA BITS RESET MAX349 FUNCTION D7 D6 D5 D4 D3 D2 D1 DO 0 X X X X All switches open 07 00 0 1 0 0 0 0 0 0 0 0 All switches open 07 00 0 1 1 1 1 1 1 1 1 1 All switches closed to COM 07 00 1 1 0 Switch 7 open off 1 1 Switch 7 closed to COM 1 0 Switch 6 open off 1 1 Switch 6 closed to COM 1 X X 0 Switch 5 open off 1 1 Switch 5 closed to COM 1 0 Switch 4 open off 1 1 Switch 4 closed to COM 1 X X X X 0 X Switch 3 open off 1 1 Switch 3 closed to COM 1 X 0 X X Switch 2 open off 1 X X X X X 1 X X Switch 2 closed to COM 1 X X X X X X 0 X Switch 1 open off 1 X X X X X X 1 X Switch 1 closed to COM 1 X X X X X X X 0 Switch 0 open off 1 X X X X X X X 1 Switc
13. MAX349 Dual 4 to 1 Mux MAX350 1000 Signal Paths with 5V Supplies Rail to Rail Signal Handling 9 2 7V to 8V Dual Supplies 2 7V to 16V Single Supply gt 2kV ESD Protection per Method 3015 7 9 TTL CMOS Compatible Inputs with 5V or 5V Supplies 9 9 Ordering Information PART TEMP RANGE PIN PACKAGE MAX349CPN 0 C to 70 C 18 Plastic DIP MAX349CWN 0 C to 70 C 18 Wide SO MAX349CAP 0 C to 70 C 20 SSOP MAX349C D 0 C to 70 C Dice Ordering Information continued at end of data sheet Contact factory for dice specifications Pin Configurations Functional Diagrams SCLK 18 CS N C NOT INTERNALLY DIP SO CONNECTED Pin Configurations continued at end of data sheet TOP VIEW DIP SO SPI and QSPI are trademarks of Motorola Inc MICROWIRE is a trademark of National Semiconductor Corp Rail to Rail is a registered trademark of Nippon Motorola Ltd MAXIM Maxim Integrated Products 1 For free samples amp the latest literature httpz www maxim ic com or phone 1 800 998 8800 For small orders phone 1 800 835 8769 OSEXVW 6VEXVIN MAX349 MAX350 Serially Controlled Low Voltage 8 Channel Dual 4 Channel Multiplexers ABSOLUTE MAXIMUM RATINGS Voltages Referenced to GND p 0 3V 17V 17 0 3V Ve
14. T is the output of the shift register with data appearing synchronously with SCLK s falling edge Data at DOUT is simply the input data delayed by eight clock cycles When shifting the input data D7 is the first bit in and out of the shift register While shifting data the switches remain in their previous configuration When the eight bits of data have been shifted in CS is driven high This updates the new switch configuration and inhibits further data from entering the shift register Transitions at DIN and SCLK have no effect when CS is high and DOUT holds the first input bit D7 at its output More or fewer than eight clock cycles can be entered during the CS low period When this happens the shift register contains only the last eight serial data bits regardless of when they were entered On the rising edge of CS all switches are set to the corresponding states The MAX349 MAX350 three wire serial interface is compatible with SPI QSPI and MICROWIRE standards If interfacing with a Motorola processor serial interface set CPOL 0 The MAX349 MAX350 are considered to be slave devices Figures 2 and 3 At power up the shift register contains all zeros and all switches are off The latch that drives the analog switch is updated on the rising edge of CS regardless of SCLK s state This meets all SPI and QSPI requirements Daisy Chaining For a simple interface using several MAX349s and 3505 daisy chain the shi
15. X350CAP 0 C to 70 C 20 SSOP MAX350C D 0 C to 70 C Dice 50 40 C to 85 C 18 Plastic DIP MAX350EWN 40 C to 85 C 18 Wide SO 50 40 C to 85 C 20 SSOP MAX350MJN 55 C to 125 C 18 CERDIP Contact factory for availability MAXIM Contact factory for dice specifications Chip Topographies MAX349 V cs DIN SCLK RESET DOUT GND COM NO0 NO1 V cs NO1A NO2A NO3B 0 100 2 54mm TRANSISTOR COUNT 500 SUBSTRATE CONNECTED TO V NO2B 19 OSEXVW 6VEXVIN MAX349 MAX350 Serially Controlled Low Voltage 8 Channel Dual 4 Channel Multiplexers Package Information INCHES MILLIMETERS MIN MAX MIN MAX 1 oes 0078 173 199 Ai 0 002 0 008 0 05 021 0 010 0 015 0 25 0 38 0 004 0 008 009 020 SEE VARIATIONS 0 205 0209 5 20 5 38 0 0256 BSC 0 65 BSC 0 301 7 65 7 90 0 025 0 037 0 63 0 95 o se of 8 2 0 dC J DO NOT INCLUDE MOLD FLASH X l PROPRIETARY INFORMATION SSOP EPS INCHES MILLIMETERS MIN MAX MIN 0 239 10249 607 633 14L 0 239 10249 6 07 6 33 16L 0 27810289 707 7 33 20L 0 317 0 328 8 07 8 33 241 0 397 0 407 10 07 110 33 28L
16. at TA 25 C MIN TYP MAX OSEXVW 6VEXVIN PARAMETER SYMBOL CONDITIONS UNITS Note 1 Ta 25 C 0 2 0 001 0 2 V 5 5V MAX349 C E 10 10 COM On Leakage Current COKIN V 5 5V M 100 100 Note 3 ON Vcom Vno 25 0 2 002 02 t4 5V MAX350 5 5 M 50 50 DIGITAL I O DIN SCLK CS RESET Input Voltage Logic Threshold High SEM d X DIN SCLK CS RESET Input Voltage Logic Threshold Low VIL CLEM 0 8 Y DIN SCLK CS RESET Input VSCLK z Current Logic High or Low lH liL veg 0 8V or 2 4V 0 03 DOUT Output Voltage Logic High VDOUT IDOUT 0 8mA C E M 2 8 V V DOUT Output Voltage Logic Low VDOUT IDOUT 1 6mA C E M 0 0 4 V SCLK Input Hysteresis SCLKuvsr C E M 100 mV SWITCH DYNAMIC CHARACTERISTICS f E Ta 25 C 200 275 Turn On Time From rising edge of CS CEM 400 ns 1 E 25 90 150 Turn Off Time tOFF From rising edge of CS CEM 300 ns Break Before Make Delay tBBM From rising edge of CS Ta 25 C 5 40 ns Charge Injection Note 4 VCTE CL 1nF Vno OV Rs 00 Ta 25 C 1 10 pc NO Off Capacitance Vno GND f 1MHz TA 25 C 2 pF COM Off Capacitance Vcom GND f 1 2 Ta 25 C 2 pF Switch On Capacitance C ON ORUM Ta 25 C 8 pF RL 500 CL 15pF Off Isolat
17. ata Setup Time ips CEM 17 100 Hs Data Hold Time Note 4 tDH 17 ns DIN Data Valid after Falling SCLK 50 of SCLK to 10 of Ta 25 C 85 ae Note 4 DOUT CL 10pF C E M 400 Rise Time of DOUT Note 4 5 2 1 C E 100 ns Allowable Rise Time at DIN 20 of V to 70 of V CEM 2 us SCLK Note 4 CL 10pF Fall Time of DOUT Note 4 tDF ae C E M 100 ns Allowable Fall Time at DIN face 20 of V to 70 of V CEM 2 us SCLK Note 4 CL 10pF RESET Minimum Pulse Width tRW TA 25 C 70 ns Note 1 The algebraic convention is used in this data sheet the most negative value is shown in the minimum column Note 2 ARON RON max RON min On resistance match between channels and on resistance flatness are guaranteed only with specified voltages Flatness is defined as the difference between the maximum and minimum value of on resistance as measured over the specified analog signal range Note 3 Leakage parameters are 100 tested at maximum rated hot temperature and guaranteed by correlation at room temp Note 4 Guaranteed by design Note 5 Leakage testing at single supply is guaranteed by testing with dual supplies Note 6 See Figure 6 Off isolation 2010910 VCOM VNO Vcom output NO input to off switch Note 7 Between any two switches See Figure 3 MAXIM OSEXVW 6VEXVIN 49 50 Serially Controlled Low Voltage 8 Channel Dual 4 Channel Multiplex
18. be considered as an input or an output signals pass equally well in either direction ah gt los lt 1 we Y REEL X 1 too Figure 1 Timing Diagram gt gt gt gt gt gt gt gt 13 OSEXVW 6VEXVIN MAX349 MAX350 Serially Controlled Low Voltage 8 Channel Dual 4 Channel Multiplexers Detailed Description Basic Operation The MAX349 MAX350 are 8 channel and dual 4 chan nel serially controlled multiplexers muxes These muxes are unusual in that any all or none of the input channels can be directed to the output All switches are bidirectional so inputs and outputs are inter changeable When multiple inputs are connected to an output they are also connected to one another sepa rated from each other only by the on resistance of two switches Both parts require eight bits of serial data to set all eight switches Serial Digital Interface The MAX349 MAX350 interface can be thought of as an 8 bit shift register controlled by CS Figure 2 While CS is low input data appearing at DIN is clocked into the shift register synchronously with SCLK s rising edge The input is an 8 bit word each bit controlling one of the eight switches Tables 1 and 2 DOU
19. e Figure 6 Off isolation 2010010 VCOM VNO Vcom output NO input to off switch Note 7 Between any two switches See Figure 3 Serially Controlled Low Voltage 8 Channel Dual 4 Channel Multiplexers Typical Operating Characteristics V 5V V 5V GND OV Ta 25 C unless otherwise noted ON RESISTANCE vs Vcom ON RESISTANCE vs VcoM AND TEMPERATURE ON RESISTANCE vs DUAL SUPPLIES DUAL SUPPLIES SINGLE SUPPLY 140 B 110 120 ues 100 i 100 90 Vt 33V 2 80 80 8 70 E 2 Vt 60 40 50 2 40 0 30 54 324 0 2 34 5 5 4 3 2 4 0 2 3 4 5 0 2 4 6 8 0 12 9 V V ON RESISTANCE vs VcoM AND TEMPERATURE OFF LEAKAGE vs ON LEAKAGE vs SINGLE SUPPLY TEMPERATURE TEMPERATURE g 10000 B a 8 TA 125 T i 1 000 i 3 100 4 1 1 1 04 0 2 3 4 5 50 25 0 25 50 75 100 125 50 25 0 25 50 75 100 125 Vcom V TEMPERATURE C TEMPERATURE C DATA HOLD TIME vs CHARGE INJECTION vs Vcom TURN ON TURN OFF TIMES vs Vcom POWER SUPPLY VOLTAGE B A V 5V V 5V B 5 i i
20. ed Typical values are at Ta 25 C PARAMETER SYMBOL CONDITIONS TYP Note 1 ANALOG SWITCH Analog Signal Range VNO V V V V 5V V 5V Ta 25 C 60 100 COM NO On Resistance RON Vcom 23V No 125 Q COM NO On Resistance Match V V 5V TA 25 C 16 p Between Channels Note 2 ON Vcom 3V INo 1mA C E M 20 COM NO On Resistance R V 5V V 5V INO 1mA 25 C 10 Flatness Note 2 FLATON Vcom 3V OV 3V C E 15 T Y TA 25 C 0 1 0 002 0 1 5 5V V 5 5V Voom 4 5V Wo 45V 5 9 NO Off Leakage Current 10 10 nA Note 3 OFF 425 0 1 0002 01 V 5 5V V 5 5V Voom 45V Wo 45V 5 10 10 Ta 25 C 0 1 0 002 0 1 V 5 5V MAX349 10 10 Mi 27 M 100 100 Nr Ta 25 C 01 0 002 0 1 VNo 4 5V 50 C E 5 5 COM Off Leakage Current M 50 50 Note 3 TA 25C 02 0002 02 V 5 5V MAX349 10 10 E M 100 100 Ta 25 C 0 2 0002 02 VNO 4 5 MAX350 5 5 50 50 2 MAXKLAV Serially Controlled Low Voltage 8 Channel Dual 4 Channel Multiplexers ELECTRICAL CHARACTERISTICS Dual Supplies continued V 4 5V to 5 5V V 4 5V to 5 5V TA TMIN to TMAX unless otherwise noted Typical values are
21. ed for every eight clock pulses or it can be programmed in a fast mode where channel changing occurs on each clock pulse In fast mode select the channels by sending two high pulses spaced four clock pulses apart corresponding to the two selected channels at DIN and a corre sponding CS low pulse for each of the first eight clock pulses As SCLK clocks this through the register each switch sequences one differential channel at a time starting with channel 0 Repeat this process for subse SCLK MAXIM MAX349 DIN MAX350 MICROWIRE PORT THE DOUT SI CONNECTION IS NOT REQUIRED FOR WRITING TO THE MAX349 MAX350 BUT MAY BE USED FOR DATA ECHO PURPOSES Figure 3 Connections for MICROWIRE SCLK MAXIM Figure 5 Daisy Chained Connection 16 quent channel sequencing after the first eight bits have been sent For even faster channel sequencing send only one DIN high pulse and one CS low pulse for every four clock pulses Reset Function RESET is the internal reset pin It is usually connected to a logic signal or V Drive RESET low to open all switches and set the contents of the internal shift regis ter to zero simultaneously When RESET is high the part functions normally and DOUT is sourced from V RESET must not be driven beyond V or GND DOUT MAXIM MAX349 DIN MAX350 SCLK cs CPOL 0 0 THE DOUT MISO CONNECTION IS NOT REQUIRED FOR WRITING TO THE MAX349 MAX350 BUT M
22. el Multiplexers ELECTRICAL CHARACTERISTICS Single 3V Supply continued V 3 0V to 3 6V V Ta TMIN to Tmax unless otherwise noted Typical values are at Ta 25 C MAX349 MAX350 PARAMETER SYMBOL CONDITIONS MAX UNITS SWITCH DYNAMIC CHARACTERISTICS 1 m Ta 25 C 275 600 Turn On Time Note 4 ton From rising edge of CS CEM 700 ns as Ta 25 C 120 300 Turn Off Time Note 4 tOFF From rising edge of CS CEM 400 ns Break Before Make Delay Note 4 BBM From rising edge of CS TA 25 C 5 15 ns Charge Injection Note 4 VCTE CL 1nF VNo OV Rs 00 TA 25 C 1 10 pc RL 500 15pF n 4 Off Isolation Note 6 Viso VNo 1Vams f 100kHz TA 25 C gt 90 dB Channel to Channel Crosstalk 500 15pF 5 2 Note 1VAMs f 100 25 C S790 dB MAKIM 4 3 0 9 OSEXVW 6VEXVIN MAX349 MAX350 Serially Controlled Low Voltage 8 Channel Dual 4 Channel Multiplexers TIMING CHARACTERISTICS Single 3V Supply Figure 1 V 3 0V to 3 6V V OV TA TMIN to Tmax unless otherwise noted Typical values are at TA 25 C MIN TYP MAX PARAMETER SYMBOL CONDITIONS Note 1 UNITS SERIAL DIGITAL INTERFACE SCLK Frequency fSCLK C E M 0 2 1 MHz Cycle Time Note 4 tcH tcL 480 ns CS Lead Time Note
23. ers ELECTRICAL CHARACTERISTICS Single 3V Supply V 3 0V to 3 6V V Ta TMIN to Tmax unless otherwise noted Typical values are at Ta 25 C PARAMETER SYMBOL CONDITIONS MIN Note 1 ANALOG SWITCH Analog Signal Range Vcom VNO C E M V V V COM NO On Resistance RON 12 Vcom 1 5 c E 425 2 0 20 Ta 25 C 0 1 0 002 0 1 MAX349 C E 10 10 fr M 100 100 VNo OV 25 0 1 0 02 0 1 MAX350 5 5 COM Off Leakage Current IcOM OFP M 50 50 nA Notes 4 5 Ta 25 C 0 2 0 002 0 2 MAX349 C E 10 10 100 100 Vio Ta 25 C 0 2 0 002 02 50 5 5 50 50 Ta 25 C 0 2 0 01 0 2 MAX349 C E 10 10 COM On Leakage Current icone V 3 6 M 100 100 nA Notes 4 5 Vcom VNO 3V 25 0 2 0 02 0 2 50 5 5 M 50 50 DIGITAL I O Voltage Logic Threshold High 00 YH CE 24 v 6 v TL vee aut 24V C E E 0 03 HA DOUT Output Voltage Logic High VDOUT IDOUT 0 1mA C E M 2 8 V V DOUT Output Voltage Logic Low VDOUT IDOUT 1 6mA C E M 0 0 4 V SCLK Input Hysteresis SCLKHYST C E M 100 mV POWER SUPPLY V Supply Current eA A POKON c E 425 8 20 uA AVLAZCLAVI Serially Controlled Low Voltage 8 Channel Dual 4 Chann
24. ft registers as shown in Figure 5 The CS pins of all devices are connected 14 and a stream of data is shifted through the MAX349s MAX350s in series When CS is brought high all switches are updated simultaneously Additional shift registers may be included anywhere in series with the MAX349 MAX350 data chain Note that the DOUT high level is V which may not be compatible with TTL CMOS devices if V differs from the logic supply for these other devices Addressable Serial Interface When several serial devices are configured as slaves addressable by the processor DIN pins of each decode logic individually control CS of each slave device When a slave is selected its CS pin is driven low data is shifted in and CS is driven high to latch the data Typically only one slave is addressed at a time DOUT is not used Applications Information 8x1 Multiplexer The MAX349 can be programmed normally with only one channel selected for every eight clock pulses or it can be programmed in a fast mode where channel changing occurs on each clock pulse In fast mode select the channels by sending a single high pulse corresponding to the selected channel at DIN and a corresponding CS low pulse for every eight clock puls es As SCLK clocks this through the register each switch sequences one channel at a time starting with channel 0 SWITCHES UPDATED gt 8 1 SCLK 1 1 1 T 1 i D 05
25. h 0 closed to COM Table 2 MAX350 Serial Interface Switch Programming DATA BITS RESET MAX350 FUNCTION D7 D6 D5 4 2 D1 DO 0 X X All switches open 07 00 0 1 0 0 0 0 0 0 0 0 All switches open 07 00 0 1 1 1 1 1 1 1 1 1 All switches closed to All B switches closed to COMB D7 DO 1 1 0 Switch NOOB open off 1 1 Switch NOOB closed 1 X 0 X X X X X X Switch NO1B open off 1 X 1 X X X X X X Switch NO1B closed 1 X X 0 X X X X X Switch NO2B open off 1 X X 1 X X X X X Switch NO2B closed 1 X X X 0 X X X X Switch NO3B open off 1 X X X 1 X X X X Switch NO3B closed 1 X X X X 0 X X X Switch NO3A open off 1 X X X X 1 X X X Switch NO3A closed 1 X X X X X 0 X X Switch NO2A open off 1 X X X X X 1 X X Switch NO2A closed 1 X X X X X X 0 X Switch NO1A open off 1 1 Switch NO1A closed 1 0 Switch NOOA open off 1 1 Switch NOOA closed X Don t care Data bit D7 is first bit in data bit DO is last in MAKII OSEXVW 6VEXVIN 49 50 Serially Controlled Low Voltage 8 Channel Dual 4 Channel Multiplexers Dual Differential 4 Channel Multiplexer The MAX350 can be programmed normally with only one differential channel select
26. ings and can damage the part and or external circuits Single Supply The MAX349 MAX350 operate from single supplies between and 16V when V is connected to GND All of the bipolar precautions must be observed High Frequency Performance In 500 systems signal response is reasonably flat up to 50MHz see Typical Operating Characteristics Above 20MHz the on response has several minor peaks that are highly layout dependent The problem is not turning the switch on but turning it off The off state switch acts like a capacitor and passes higher frequen cies with less attenuation At 10MHz off isolation is about 45dB in 50 systems becoming worse imately 20dB per decade as frequency increases Higher circuit impedances also make off isolation worse Adjacent channel attenuation is about 3dB above that of a bare IC socket and is entirely due to capacitive coupling Pin Configurations Functional Diagrams continued TOP VIEW N C NOT INTERNALLY CONNECTED 18 AVLAZCLAVI Serially Controlled Low Voltage 8 Channel Dual 4 Channel Multiplexers Ordering Information continued PART TEMP RANGE PIN PACKAGE 49 40 C to 85 C 18 Plastic DIP MAX349EWN 40 C to 85 C 18 Wide SO MAX349EAP 40 C to 85 C 20 SSOP MAX349MJN 55 C to 125 C 18 CERDIP MAX350CPN 0 C to 70 C 18 Plastic DIP MAX350CWN 0 C to 70 C 18 Wide SO MA
27. ion Viso VNo 1VRMs f 100kHz TA 25 C gt 90 dB RL 500 15pF Channel to Channel Crosstalk VNo 5 f 100kHz TA 25 C 90 dB POWER SUPPLY Power Supply Range V V C E M 3 8 V DIN CS SCLK OV or V TA 25 C 7 20 VISDHBD Current RESET OV or V DIN CS SCLK OV or V TA 25 C 1 0 1 1 Y Supply Current RESET OV or V C E M E 2 AVLAZCLAM gt gt 3 MAX349 MAX350 Serially Controlled Low Voltage 8 Channel Dual 4 Channel Multiplexers TIMING CHARACTERISTICS Dual Supplies Figure 1 V 4 5V to 5 5V V 4 5V to 5 5V TA TMIN to TMAX unless otherwise noted Typical values are at TA 25 C MIN TYP MAX PARAMETER SYMBOL CONDITIONS Note 1 UNITS SERIAL DIGITAL INTERFACE SCLK Frequency C E M 0 2 1 MHz Cycle Time tcL C E M 480 ns CS Lead Time tcss C E M 240 ns CS Lag Time tCSH2 240 ns SCLK High Time tCH C E M 190 ns SCLK Low Time tcL C E M 190 ns Minimum Data Setup Time tps C E M 17 100 ns Data Hold Time tDH C E M 0 17 ns DIN Data Valid after Falling SCLK ibo 5096 of SCLK to 1096 of DOUT TA 25 C 85 Note 4 CL 10pF CEM 400 Rise Time of DOUT Note 4 ie ee 100 ns L 10pF Allowable Rise Time at DIN SCLK ieee 20 of V to 70 of V CEM 2 us Note 4 CL
28. t All analog leak age current flows to the supply terminals not to the other switch terminal This is why both sides of a given switch can show leakage currents of either the same or opposite polarity There is no connection between the analog signal paths and GND V and GND power the internal logic and logic level translators and set both the input and output logic lim its The logic level translators convert the logic levels to switched V and V signals to drive the analog signal gates This drive signal is the only connection between the logic supplies and signals and the analog sup plies V and V have ESD protection diodes to GND The logic level inputs and output have ESD protection to V and to GND The logic level thresholds are CMOS and TTL compati ble when V is 5V As V rises the threshold increases slightly Therefore when V reaches 12V the threshold is about 3 1V above the TTL guaranteed high level mini mum of 2 8V but still compatible with CMOS outputs 17 OSEXVIW 6TL XVIA MAX349 MAX350 Serially Controlled Low Voltage 8 Channel Dual 4 Channel Multiplexers Bipolar Supplies The MAX349 MAX350 operate with bipolar supplies from 3 0V and 8V The V and V supplies need not be symmetrical but their sum cannot exceed the absolute maximum rating of 17V Do not connect the MAX349 MAX350 V to 3V and connect the logic level pins to TTL logic level signals This exceeds the absolute maximum rat
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