MAXIM MAX3384E handbook
Contents
1. DAES RAGA GMS Aman BAERS oro Roe o MI AALJV 15kV ESD Protected 3 0V to 5 5V Low Power up to 250kbps True RS 232 Transceiver General Description Features The MAX3384E is a 3V powered ElA TIA 232 and 4 ESD Protection for RS 232 I O Pins V 28 V 24 communications interface with low power 15kV Human Body Model requirements high data rate capabilities and en 8kV IEC 1000 4 2 Contact Discharge hanced electrostatic discharge ESD protection All 15kV IEC 1000 4 2 Air Gap Discharge transmitter outputs and receiver inputs are protected to 15kV using IEC 1000 4 2 Air Gap Discharge 8kV using IEC 1000 4 2 Contact Discharge and 15kV using the Human Body Model The transceiver has a proprietary low dropout transmit ter output stage delivering true RS 232 performance from a 3 0V to 5 5V supply with a dual charge pump 6V us Guaranteed Slew Rate The charge pump requires only four small O 1uF capac Transmitter and Receiver Outputs High itors for operation from a 3 3V supply Each device is Impedance in Shutdown guaranteed to run at data rates of 250kbps while main Meets EIA TIA 232 Specifications Down to 3 0V taining RS 232 output levels The MAX3384E has two receivers and two drivers It P gt features a 1A shutdown mode that reduces power con Ordering Information sumption and extends battery life in portable systems PART TEMP RANGE PIN PACKAGE The MAX3384E is available i2. 0 047uF C2 C4 0 33pF PARAMETER CONDITIONS MIN TYP MAX UNITS DC CHARACTERISTICS Vcc 3 3V or 5V TA 25 C Supply Current SHDN Vcc no load 0 3 1 mA Shutdown Supply Current SHDN GND 1 10 uA LOGIC INPUTS Input Logic Threshold Low T_IN SHDN 0 8 V _ _ Vcc 3 3V 2 0 Input Logic Threshold High _IN SHDN V Vcc 5V 2 4 Transmitter Input Hysteresis 0 5 V Input Leakage Current T_IN SHDN 0 01 1 uA RECEIVER OUTPUTS Output Leakage Current R_OUT receivers disabled 0 05 10 pA Output Voltage Low IOUT 1 6mA 4 V Output Voltage High IOUT 1 0MA Vcc Vec v 0 6 0 1 RECEIVER INPUTS Input Voltage Range 25 25 V Input Threshold Low Ta 25 C eo Lan V Vcc 5V 0 8 ES gt Vcc 3 3V 1 5 2 4 Input Threshold High A 25 C V Vcc 5V 1 8 2 4 Input Hysteresis 0 5 V Input Resistance Ta 25 C 3 5 7 kQ MAXIM 15kV ESD Protected 3 0V to 5 5V Low Power up to 250kbps True RS 232 Transceiver ELECTRICAL CHARACTERISTICS continued Vcc 3V to 5 5V for tests at 3 3V 10 C1 C4 0 1uF for tests at 5V 10 C1 0 047uF C2 C4 0 33puF TA TMIN to Tmax unless otherwise noted Typical values are at Ta 25 C PARAMETER CONDITIONS MIN TYP MAX UNITS TRANSMITTER OUTPUTS Output Voltage Swing All transmitter outputs load
3. AS SHOWN N ABOVE TABLE 6 N NUMBER OF PINS LAAK 1 AVA PACKAGE FAMILY OUTLINE SOIC 3001 21 0042 A Ss PROPRIETARY INFORMATION DOCUMENT CONTROL NUMBER REV Y 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 11 Maxim Integrated Products 120 San Gabriel Drive Sunnyvale CA 94086 408 737 7600 O 2001 Maxim Integrated Products Printed USA MAXIM is a registered trademark of Maxim Integrated Products JIVBEEXVIN
4. the transmitter and receiver out puts are disabled high impedance The time required to exit shutdown is typically 100us as shown in Figure 2 Connect SHDN to Vcc if the shutdown mode is not used 15kV ESD Protection As with all Maxim devices ESD protection structures are incorporated on all pins to protect against electro static discharges encountered during handling and assembly The driver outputs and receiver inputs of the MAX3384E have extra protection against static electric ity Maxim s engineers have developed state of the art structures to protect these pins against ESD of 15kV without damage The ESD structures withstand high ESD in all states normal operation shutdown and powered down After an ESD event Maxim s E ver sions keep working without latchup whereas compet ing RS 232 products can latch and must be powered down to remove latchup ESD protection can be tested in various ways the transmitter outputs and receiver inputs of this product family are characterized for protection to the following limits 1 15kV using the Human Body Model 2 8kV using the contact discharge method specified in IEC 1000 4 2 3 15kV using IEC 1000 4 2 s air gap method ESD Test Conditions ESD performance depends on a variety of conditions Contact Maxim for a reliability report that documents test setup test methodology and test results Human Body Model Figure 3a shows the Human Body Model an
5. 5 8 17 T_OUT RS 232 Transmitter Outputs High Z when SHDN is low 9 14 9 16 R_IN RS 232 Receiver Inputs 10 13 12 15 R_OU TTL CMOS Receiver Outputs High Z when SHDN is low 11 12 13 14 T_IN TTL CMOS Transmitter Inputs 16 18 GND Ground 17 19 Vcc 3 0V to 5 5V Supply Voltage Connect a 0 1uF capacitor to GND 18 20 SHDN Active Low Shutdown Control Input Drive low to shut down transmitters receivers and charge pumps MAKIM 15kV ESD Protected 3 0V to 5 5V Low Power up to 250kbps True RS 232 Transceiver MAXIM MAX3384E MINIMUM SLEW RATE TEST CIRCUIT Figure 1 Slew Rate Test Circuits Detailed Description Dual Charge Pump Voltage Converter The MAX3384E s internal power supply consists of a regulated dual charge pump that provides output volt ages of 5 5V doubling charge pump and 5 5V inverting charge pump over the 3 0V to 5 5V Vcc range The charge pump operates in discontinuous mode if the output voltages are less than 5 5V the charge pump is enabled and if the output voltages exceed 5 5V the charge pump is disabled Each charge pump requires a flying capacitor C1 C2 anda reservoir capacitor C3 C4 to generate the V and V supplies Figure 1 RS 232 Transmitters The transmitters are inverting level translators that con vert CMOS logic levels to 5 0V EIA TIA 232 levels The MAX3384E transmitters guarantee a 250kbps data rate with worst case loads of 3kQ in paral
6. E OUTLINE SSOP 5 3X 65mm E c rn PRE AL DOCUMENT CONTROL NO REV 1 3 CONTROLLING DIMENSION MILLIMETER 21 0056 A YA 10 MAXIM 15kV ESD Protected 3 0V to 5 5V Low Power up to 250kbps True RS 232 Transceiver Package Information continued Fr N SOICW EPS Al INCHES MILLIMETERS INCHES MILLIMETERS MIN AX_ MIN MAX MIN AX MIN MAX N MS013 A 0 093 0104 235 265 D 10 398 10 413 110 10 110 50116 AA A1 0 004 0012 0 10 0 30 D 10 447 0 463 1113535117518 AB B 0 014 0 019 0 35 0 49 D 10 496 0 512 12 60 13 00 20 AC C 0 009 0 013 0 23 0 32 D 0 598 0 614 15 20115 60 24 AD e 0 050 ber D 10 697 0 713 17 70 18 10 28 AE E 0 291 0 299 7 40 7 60 nares H 0 3941 0 419 10 00 10 63 D amp E DO NOT INCLUDE MOLD FLASH h 0 010 0 030 0 2e5 0 75 5 MOLD FLASH DR PROTRUSIONS NOT Loea oae o a yt 102mm 004 4 CONTROLLING DIMENSION MILLIMETER 5 MEETS JEDEC MS013 XX
7. V to 7V V to GND Note 1 0 3V to 7V VE IV Note Descarrila ionin 13V Input Voltages TIN SHDN TO GND wrcccestacd eececsetinascasentesesncstures a 0 3V to 6V PEIN TO GND actina dina 25V Output Voltages T Toe cnica dice 13 2V 0 3V to Vcc 0 3V Maximum Current into TOUT iooooninccninocccoccccoonnnnonnnnnnoos 100mA Short Circuit Duration TOUT to GND Continuous Continuous Power Dissipation Ta 70 C 20 Pin SSOP derate 8 00mW C above 70 C 640mW 18 Pin SO derate 9 52mW C above 70 C Operating Temperature Ranges MAX3384 MAX3384E MAX3384 Junction Temperature Storage Temperature Range Lead Temperature soldering 10s Note 1 V and V can have maximum magnitudes of 7V but their absolute difference cannot exceed 13V rata paid 0 C to 70 C aes 0 C to 70 C 40 C to 85 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 Vcc 3V to 5 5V for tests at 3 3V 10 C1 C4 0 1uF for tests at 5V 10 TA TMIN to Tmax unless otherwise noted Typical values are at Ta 25 C C1
8. d Figure 3b shows the current waveform it generates when dis charged into a low impedance This model consists of a 100pF capacitor charged to the ESD voltage of interest which is then discharged into the test device through a 1 5kQ resistor IEC 1000 4 2 The IEC 1000 4 2 standard covers ESD testing and per formance of finished equipment it does not specifically refer to integrated circuits The MAX3384E helps you design equipment that meets Level 4 the highest level of IEC 1000 4 2 without the need for additional ESD pro tection components The major difference between tests done using the Human Body Model and IEC 1000 4 2 is higher peak current in IEC 1000 4 2 because series resistance is lower in the IEC 1000 4 2 model Hence the ESD with stand voltage measured to IEC 1000 4 2 is generally lower than that measured using the Human Body Model Figure 4a shows the IEC 1000 4 2 model and Figure 4b shows the current waveform for the 8kV IEC 1000 4 2 Level 4 ESD contact discharge test The air gap test involves approaching the device with a charged probe The contact discharge method con nects the probe to the device before the probe is ener gized Machine Model The Machine Model for ESD tests all pins using a 200pF storage capacitor and zero discharge resis tance Its objective is to emulate the stress caused by contact that occurs with handling and assembly during manufacturing Of course all pins require this protec ti
9. ed with 3kQ in parallel with 2500pF The transmitter outputs display no ringing or undesir able transients as they come out of shutdown Note that the transmitters are enabled only when the magnitude of V exceeds approximately 3V MAXUM MAX3384E Figure 6 Loopback Test Circuit High Data Rates The MAX3384E maintains the RS 232 5 0V minimum transmitter output voltage even at high data rates Figure 6 shows a transmitter loopback test circuit Figure 7 shows a loopback test result at 120kbps and Figure 8 shows the same test at 250kbps For Figure 7 all transmitters were driven simultaneously at 120kbps into RS 232 loads in parallel with 1000pF For Figure 8 a single transmitter was driven at 250kbps and all transmitters were loaded with an RS 232 receiver in parallel with 1000pF avd 5V div 5V div C1 C4 01uF dei 2us div Figure 7 MAX3384E Loopback Test Result at 120kbps 5V div iat 5V div 5V div C1 04 0 1uF 2us div Figure 8 MAX3384E Loopback Test Result at 250kbps MAXIM 15kV ESD Protected 3 0V to 5 5V Low Power up to 250kbps True RS 232 Transceiver Table 3 Logic Family Compatibility with Various Supply Voltages SYSTEM Vcc SUPPLY POWER SUPPLY VOLTAGE ne COMPATIBILITY V Compatible with all 3 3 22 CMOS families 5 5 Compatible with all TTL and CMOS families Compatible with ACT 5 33 and HCT CMOS and with AC HC o
10. ed with 3kQ to ground 5 5 4 V Output Resistance Vcc 0 transmitter output 2V 300 10M Q Output Short Circuit Current 60 mA Output Leakage Current Vcc 0 or 3V to 5 5V VouT 12V transmitters dis 25 pA ESD PROTECTION Human Body Model 15 R_IN T_OUT IEC1000 4 2 Air Discharge 15 kV IEC1000 4 2 Contact Discharge 8 TIMING CHARACTERISTICS Vcc 3V to 5 5V for tests at 3 3V 10 C1 C4 0 1uF for tests at 5V 10 C1 0 047uF C2 C4 0 33uF Ta TMIN to Tmax unless otherwise noted Typical values are at Ta 25 C PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Maximum Data Rate RL 3kQ CL 1000pF 250 kbps one transmitter switching tPHL Receiver input to receiver output 0 15 Receiver Propagation Dela i S Receiver Output Enable Time SHDN from GND to Vcc 200 ns Receiver Output Disable Time SHDN from Vcc to GND 200 ns Time to Exit Shutdown VouT gt 3 7V RLOAD at V 3kQ 250 us Transmitter Skew ItPHL tPLH Note 2 100 ns Receiver Skew ItPHL tPLHI 50 ns Vcc 3 3V CL 150pF to 6 30 Ta 25 C 1000pF Transition Region Slew Rate RL 3kQ to 7kQ V us measured from 3V CL 150pF to i a to 3V or 3V to 3V 2500pF Note 2 Transmitter skew is measured at the transmitter zero cross points MAXIM JIVBEEXVIN MAX3384E 15kV ESD Protected 3 0V to 5 5V Low Power up to 250kbps True RS 232 Tra
11. lel with 1000pF providing compatibility with PC to PC communication software such as LapLink Transmitters can be paral leled to drive multiple receivers or mice Laplink is a trademark of Traveling Software MAXIM MAXIM MAX3384E MAXIMUM SLEW RATE TEST CIRCUIT The MAX3384E s transmitters are disabled and the out puts are forced into a high impedance state when the device is in shutdown SHDN GND The MAX3384E permits the outputs to be driven up to 12V in shut down The transmitter inputs do not have pullup resistors Connect unused inputs to GND or Vcc RS 232 Receivers The receivers convert RS 232 signals to CMOS logic output levels Table 1 The receiver outputs are forced into a high impedance state when the device is in shut down SHDN GND This allows a single UART to multiplex between different protocols Shutdown Mode Supply current falls to less than 1uA in shutdown mode SHDN low When shut down the device s charge Table 1 Shutdown Truth Table SHDN T_OUT R_OUT 0 High Z High Z 1 Active Active JIVBEEXVIN MAX3384E 15kV ESD Protected 3 0V to 5 5V Low Power up to 250kbps True RS 232 Transceiver 5V div o 2V div o t A S E Pt pos Ver 3 3V t C1 C4 0 1uF 40us div Figure 2 Transmitter Outputs Exiting Shutdown or Powering Up pumps are shut off V is pulled down to Vcc V is pulled to ground and
12. n a space saving SSOP MAX3384ECAP 0 C to 70 C 20 SSOP package in either the commercial 0 C to 70 C or Latchup Free 300A Supply Current 1pA Low Power Shutdown 250kbps Guaranteed Data Rate 250us Time to Exit Shutdown with 3kQ Load on V So e a a a A extended temperature 40 C to 85 C range een aes ee MAX3384EEAP 40 C to 85 C 20 SSOP _ CCA plications Typical Operating Circuit Hand Held Equipment Battery Powered AN Peripherals Equipment ps Printers PDAs Ceypass T gt 7 cc MAXIM T Olp Pin Configurations MAX3384E C4 0 1pF TOP VIEW TTL CMOS RS 232 INPUTS OUTPUTS MAXIM MAX3384E TTL CMOS RS 232 OUTPUTS INPUTS SSOP Pin Configurations continued at end of data sheet C3 CAN BE RETURNED TO EITHER Vcc OR GROUND NOTE SEE TABLE 2 FOR CAPACITOR SELECTION tCovered by U S Patent numbers 4 636 930 4 679 134 4 777 577 4 797 899 4 809 152 4 897 774 4 999 761 and other patents pending MAXKLAV Maxim Integrated Products 1 For price delivery and to place orders please contact Maxim Distribution at 1 888 629 4642 or visit Maxim s website at www maxim ic com IDBEEXVIN MAX3384E 15kV ESD Protected 3 0V to 5 5V Low Power up to 250kbps True RS 232 Transceiver ABSOLUTE MAXIMUM RATINGS VCC to GND oeie e rne e a E EES 0 3V to 6V V to GND Note 1 0 3
13. nsceiver Typical Operating Characteristics TRANSMITTER OUTPUT VOLTAGE vs LOAD CAPACITANCE Vcc 3 3V 250kbps data rate 0 1uF capacitors all transmitters loaded with 3kQ and CL Ta 25 C unless otherwise noted OPERATING SUPPLY CURRENT SLEW RATE vs LOAD CAPACITANCE vs LOAD CAPACITANCE 6 Sy SE EE LL E E 45 3 5 Snr s 3 T1 TRANSMITTING AT 250kbps ES me E 40 72 TRANSMITTING AT 15 6kbps S 2 3 38 T1 TRANSMITTING AT 250kbps gt Ez 30 250kbps E T2 TRANSMITTING AT 15 6kbps 120kbps 50 z S E 1 gt 2 E a a 20kbps 35 3 10 E 4 5 FOR DATA RATES UP TO 250kbps 6 0 0 0 1000 2000 3000 4000 5000 0 1000 2000 3000 4000 5000 0 1000 2000 3000 4000 5000 LOAD CAPACITANCE pF LOAD CAPACITANCE pF LOAD CAPACITANCE pF Pin Description PIN NAME FUNCTION so SSOP 1 1 10 11 N C o Connection Not internally connected 2 2 C1 Positive terminal of the voltage doubler charge pump capacitor 3 3 V 5 5V generated by the charge pump 4 4 C1 egative terminal of the voltage doubler charge pump capacitor 5 5 C2 Positive terminal of inverting charge pump capacitor 6 6 C2 egative terminal of inverting charge pump capacitor 7 7 V 5 5V generated by the charge pump 8 1
14. o maintain the proper ratios C1 to the other capacitors When using the minimum required capacitor values make sure the capacitor value does not degrade excessively with temperature If in doubt use capaci tors with a larger nominal value The capacitor s equiva MAKINI Ip 100 PEAK TO PEAK RINGING 90 NOT DRAWN TO SCALE AMPERES 36 8 10 0 TIME gt _ _ tb CURRENT WAVEFORM Figure 3b Human Body Model Current Waveform 10 tr 0 7ns to Ins Figure 4b IEC 1000 4 2 ESD Generator Current Waveform lent series resistance ESR which usually rises at low temperatures influences the amount of ripple on V and V Power Supply Decoupling In most circumstances a 0 1uF Vcc bypass capacitor is adequate In applications that are sensitive to power supply noise use a Capacitor of the same value as charge pump capacitor C1 Connect bypass capaci tors as close to the IC as possible Operation Down to 2 7V Transmitter outputs will meet EIA TIA 562 levels of 3 7V with supply voltages as low as 2 7V JIVBEEXVIN MAX3384E 15kV ESD Protected 3 0V to 5 5V Low Power up to 250kbps True RS 232 Transceiver Transmitter Outputs when Exiting Shutdown Figure 2 shows two transmitter outputs when exiting shutdown mode As they become active the two trans mitter outputs are shown going to opposite RS 232 lev els one transmitter input is high the other is low Each transmitter is load
15. on during manufacturing not just RS 232 inputs and outputs Therefore after PC board assembly the Machine Model is less relevant to I O ports Applications Information Capacitor Selection The capacitor type used for C1 C4 is not critical for proper operation polarized or nonpolarized capacitors Table 2 Required Minimum Capacitance Values Vcc C1 CBYPASS C2 C3 C4 V HF HF 3 0 to 3 6 0 1 0 1 4 5 to 5 5 0 047 0 33 3 0 to 5 5 0 1 0 47 MAKII 15kV ESD Protected 3 0V to 5 5V Low Power up to 250kbps True RS 232 Transceiver Rc Rp 1M 15000 Pi oma A VV AM CHARGE CURRENT DISCHARGE LIMIT RESISTOR RESISTANCE HIGH DEVICE VOLTAGE STORAGE UNDER CAPACITOR TEST Figure 3a Human Body ESD Test Model Rc 50M to 100M DISCHARGE RESISTANCE CHARGE CURRENT LIMIT RESISTOR HIGH DEVICE VOLTAGE STORAGE UNDER DC CAPACITOR TEST SOURCE Figure 4a IEC 1000 4 2 ESD Test Model can be used The charge pump requires 0O 1uF capaci tors for 3 3V operation For other supply voltages refer to Table 2 for required capacitor values Do not use val ues smaller than those listed in Table 2 Increasing the capacitor values e g by a factor of 2 reduces ripple on the transmitter outputs and slightly reduces power consumption C2 C3 and C4 can be increased without changing C1 s value However do not increase C1 without also increasing the values of C2 C3 C4 and CBypass t
16. r CD4000 CMOS Interconnection with 3V and 5V Logic The MAX3384E can directly interface with various 5V logic families including ACT and HCT CMOS See Table 3 for more information on possible combinations of interconnections MAKIM Pin Configurations continued TOP VIEW N C Ci Chip Information TRANSISTOR COUNT 1129 Process BICMOS AVSeexvNn MAX3384E 15kV ESD Protected 3 0V to 5 5V Low Power up to 250kbps True RS 232 Transceiver Package Information a INCHES MILLIMETERS 2 A a ooss oo78 173 199 MIN Ee Al 0 002 0 008 0 05 0 21 D 0 239 0 249 607 6 33 14L i taah Tose loss eaa aa tok ama arar a eE EN D SEE VARIATIONS D 0 317 10 328 8 07 8 33 24L l E 070510209 5201538 D 0 397 0 407 10 07 10 33 28L e 0 0256 BSC 0 65 BSC H 0 301 Jo 3i1 7 65 7 90 L 0 025 0 037 0 63 0 95 ato e o g mim s had D Al NOTES 1 D amp E DO NOT INCLUDE LD FLASH AIVA X l SV 2 MOLD FLASH OR PROTRUSIONS N TO ate EXCEED 15mm 006 PACKAG
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MAXIM MAX3384E handbook