MAXIM MXL1344A Manual
Contents
1. LATCH Vec Figure 3 Block Diagram chipset must be used without substituting other manu facturer s parts on a chip by chip basis Termination Modes The termination networks in the MXL1344A can be set to one of three modes V 11 V 35 or high impedance high Z As shown in Figure 4 in V 11 mode switch S1 MAXIM is closed and switch S2 is open presenting 104Q across terminals A and B In V 35 mode switches S1 and S2 are both closed presenting a T network with 1040 differential impedance and 153Q common mode impedance In high Z mode switches S1 and S2 are both open presenting a high impedance across termi nals A and B suitable for V 28 and V 10 modes MXL1344A 5V Multiprotocol Software Selectable Cable Terminator MAXIMA MAXIM MAXIMA MXL1344A MXL1344A MXL1344A 1 1 ol CLOSED CLOSED S2 R3 CLOSED 1270 R2 520 b V 35 Figure 4 Termination Modes Table 1 Termination Mode Select Table PROTOCOL DCE DTE o V 10 RS 423 RS 530A RS 530 X 21 V 35 RS 449 V 36 No Cable RS 530A X 21 RS 449 V 36 V 28 RS 232 No Cable Note Z Indicates high impedance 1 high 0 low 2 V 11 and V 35 refer to termination modes Figure 4 ojojojojolo alaululzlolololo 2 NINININININ LIN o a fi as i i i i a V 11 lt N NL NL NL INT IN2. 640mW VOE ea 0 3V to 6V Operating Temperature ME CCC E EE E 0 3V to 7V Die Temperature Logic Input Voltages MO M1 M2 DCE DTE LATCH Termination Network Inputs 0 3V to 6V Lead Temperature soldering 10s Storage Temperature Range RA A 15V to 15V R A tO ta 15V 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 5V 5 VEE 5V 5 TA 0 C to 70 C unless otherwise noted Typical values are at TA 25 C Vcc 5V VEE 5V unless otherwise noted PARAMETER SYMBOL CONDITIONS DC CHARACTERISTICS Vcc Supply Current TERMINATOR PINS Differential Mode Impedance V 35 Mode lec All logic inputs GND or Vcc 2V Vom lt 2V all loads Figure 1 Common Mode Impedance V 35 Mode 2V lt 2V all loads Figure 2 Differential Mode Impedance V 11 Mode High Impedance Leakage Current 2 Vom all loads 7
3. MAXIM 7 VPTELTXMW MXL1344A 5V Multiprotocol Software Selectable Cable Terminator No Cable Mode The MXL1344A enters no cable mode when the mode select inputs MO M1 and M2 are connected HIGH or left unconnected In no cable mode all six termination networks are placed in V 11 mode with S1 closed and S2 open Figure 4 Applications Information Older multiprotocol interface termination circuits have been constructed using expensive relays with discrete resistors custom cables with built in termination or complex circuit board configurations to route signals to BALANCED INTERCONNECTING GENERATOR 4 CABLE CABLE TERMINATION RECEIVER Figure 6 Typical V 11 Interface the correct termination The MXL1344A provides a sim ple solution to this termination problem All required ter mination configurations are easily cable or software selectable using the four mode control input pins MO M1 M2 and DCE DTE Using the MXL13444A in a Multiprotocol Serial Interface The MXL1344A terminator is designed to form a com plete 5V cable or software selectable multiprotocol DCE DTE interface port when used with the MXL 1543 and MXL1544 MAX3175 differential driver receivers The MXL1344A terminator is designed to use the VEE power generated by the MXL1543 s charge pump and will meet all data sheet specifications when connected as illustrated in Figure 5 The mode selection tables of all t
4. state of the MXL1344A s mode select pins MO each of the six termination networks within the M1 M2 and DCE DTE determines the mode of each of MXL 13444 the six termination networks Table 1 shows a cross ref erence of termination mode and select pin state for 6 MAXIM 5V Multiprotocol Software Selectable Cable Terminator 100pF 100pF 100pF MAXIM MXL1344A DB 25 CONNECTOR INTERCONNECT uti CABLE 2 DTE DCE DTE TXD DCE 4 TXDA TXDB RXDB DTE_SCTE DCE_RXC 1 SCTEA RXC A SCTEB RXCB TXCA TXCB RXCA SCTEA RXCB SCTEB RXDA TXDA RXDB TXDB MAXIM SIGNAL GND mo MXL1543 SHIELD Mi M2 DCE DTE DTE TXC DCE TXC DTE RXC DCE SCTE DTE RXD DCE TXD DCE DTE E RTS DCE CTS E DTR DCE DSR DTE DCD DCE DCD E_DSR DCE_DTR E_CTS DCE_RTS LOCAL_LOOP_BACK MAXIM MXL1544 MAX3175 M2 DCE DTE INVERT Figure 5 Cable Selectable Multiprotocol DCE DTE Serial Interface Configured in RS 530A DTE Mode
5. 35 COMMON MODE IMPEDANCE vs SUPPLY VOLTAGE Vcc vs SUPPLY VOLTAGE VEe SUPPLY CURRENT vs TEMPERATURE 65 5 65 8 500 8 450 60 z 60 8 E lee 400 a 155 a 155 3 S S 350 Lu 2 lt 150 150 S 300 7 145 445 250 9 200 lcc 40 40 150 35 35 100 45 47 49 51 53 55 55 53 54 49 47 45 0 10 20 30 40 50 60 70 MAXIM TEMPERATURE C MXL1344A 5V Multiprotocol Software Selectable Cable Terminator Pin Description FUNCTION ode Select Pin Table 1 capacitor egative Supply Voltage typically connected to VEE of MXL1543 Bypass to GND with a 0 1uF Load 1 Center Tap Load 1 Node B Load 1 Node A Load 2 Node A R2B Load 2 Node B Load 2 Center Tap Load 3 Node A Load 3 Node B 8 9 10 11 Load 3 Center Tap E 6 Ground 5V Supply Voltage Bypass to GND with a 0 1uF capacitor Load 4 Node B Load 4 Node A Load 5 Node B Load 5 Node A 1 R6A Load 6 Node A R6B Load 6 Node B LATCH Latch Signal Input When LATCH is LOW the input latches are transparent When LATCH is high the data at the mode select inputs are latched DCE DTE Logic Level HIGH selects DCE interface Table 1 M2 ode Select Pin Table 1 ode Select Pin Table 1 Vee is typically supplied by the charge pump of the MXL 1543 The Veg input level
6. Features Certified TBR 1 and TBR 2 Compliant Chipset NET1 and NET2 Pending Completion of Testing Supports V 10 RS 423 V 11 RS 422 RS 530 RS 530A RS 449 V 36 and X 21 V 28 RS 232 and V 35 Termination Cable or Software Selectable Termination Cable or Software Selectable DTE DCE Replaces Discrete Resistor Termination Networks and Expensive Relays Available in Small 24 Pin SSOP Package Applications PCI Cards Telecommunication Equipment Data Networking CSU and DSU Data Routers Data Switches Ordering Information PART MXL1344ACAG TEMP RANGE 0 C to 70 C PIN PACKAGE 24 SSOP Pin Configuration appears at end of data sheet Typical Operating Circuit SCTE MAXIM MXL1543 MAXIM MXL1344A INS a DS X INS DB 25 CONNECTOR 8 0XL 82XL v PLL v OXL 92198 ELL v 3125 MAXIM 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 Vere LIX MXL1344A 5V Multiprotocol Software Selectable Cable Terminator ABSOLUTE MAXIMUM RATINGS All Voltages to GND Unless Otherwise Noted Continuous Power Dissipation TA 70 C Supply Voltages 24 Pin SSOP derate 8mW C above 70 C
7. varies with the mode of chipset operation as follows V 35 V 28 Modes 6 50V lt Veg 5 45V in typical operation VEE 5 80V V 10 V 11 Modes 4 60V lt VEE 3 80V in typical operation VEE 4 20V Detailed Description The MXL1344A contains six software selectable multi protocol cable termination networks Figure 3 Each network is capable of terminating V 11 RS 422 RS 530 RS 530A RS 449 V 36 and X 21 with a 1000 dif ferential load V 35 with a T network load or V 28 RS 232 and V 10 RS 423 with an open circuit load for use with transceivers having on chip termination The termination protocol can be selected by the serial interface cable wiring or by software control The MXL1344A replaces discrete resistor termination net works and expensive relays required for multiprotocol termination saving space and cost The MXL1344A terminator is designed to form a com plete 5V cable or software selectable multiprotocol DTE DCE interface port when used with the MXL 1543 and MXL1544 MAX3175 transceivers The MXL1344A terminator can use the VEE power generated by the MXL 1543 charge pump simplifying system design The MXL1344A MXL 1543 and MXL1544 MAX3175 are pin for pin compatible with the LTC1344A LTC1543 and LTC1544 but for proper operation the entire Maxim MAXIM 5V Multiprotocol Software Selectable 127Q Vom 71 OR 2V V Cable Terminator AMMETER MAXIM MXL1344A
8. 19 1775 Rev 0 2 01 AVLAZXLAMI 5V Multiprotocol Software Selectable General Description The MXL 13444 contains six software selectable multi protocol cable termination networks Each network is capable of terminating V 11 RS 422 RS 530 RS 530A RS 449 V 36 and X 21 with a 1000 differential load V 35 with a T network load or V 28 RS 232 and V 10 RS 423 with an open circuit load for use with trans ceivers having on chip termination The termination pro tocol can be selected by the serial interface cable wiring or by software control The MXL1344A replaces discrete resistor termination networks and expensive relays required for multiprotocol termination saving space and cost The MXL1344A terminator is designed to form a com plete 5V cable or software selectable multiprotocol DCE DTE interface port when used with the MXL 1543 and MXL1544 MAX3175 transceiver ICs The MXL1344A terminator can use the VEE power generated by the MXL1543 charge pump simplifying system design The MXL1344A MXL 1543 and MXL1544 MAX3175 are pin for pin compatible with the LTC1344A LTC1543 and LTC1544 but for proper operation the entire Maxim chipset must be used without substituting other manu facturer s parts on a chip by chip basis The MXL 13444 is available a 24 pin SSOP package and is specified for the O C to 70 C commercial tem perature range MAXIM MXL1544 MAX3175 Cable Terminator
9. 8 0 09 10 20 0 317 0 328 8 07 8 33 24L 2 0 397 0 407 10 07 10 33 0 205 0 209 5 20 5 38 28L 0 0256 BSC 0 65 BSC 0 301 0 311 7 65 7 90 0 025 0 037 0 63 0 95 0 8 0 9 JC F NOT INCLUDE MOLD FLASH SVI AXI VI vupejpujoje i LO Q PROPRIETARY INFORMATION 2 MOLD FLASH OR PROTRUSIONS NOT TO nue EXCEED 15mm C006 5 PACKAGE OUTLINE SSOP S 3X 65mm APPROVAL DOCUMENT CONTROL NO REV 1 3 CONTROLLING DIMENSION MILLIMETER 21 0056 Ut 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 12 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
10. V VcM lt 7V all loads TA 25 C 7V lt Vom lt 7V all loads LOGIC INPUTS MO M1 M2 LATCH DCE DTE nput High Voltage VIH nput Low Voltage Logic Input Current VIL HH HL VIN Vcc or GND MAXIM 5V Multiprotocol Software Selectable Cable Terminator Typical Operating Characteristics Vcc Vee 5V TA 25 C unless otherwise noted V 11 OR V 35 DIFFERENTIAL MODE IMPEDANCE vs TEMPERATURE V 11 OR V 35 DIFFERENTIAL MODE IMPEDANCE vs COMMON MODE VOLTAGE 110 110 V 11 OR V 35 DIFFERENTIAL MODE IMPEDANCE vs SUPPLY VOLTAGE Vcc E 3 105 105 3 6 4 2 100 2 100 a a ER 5 95 95 90 90 70 J 5 3 4 3 5 7 4 50 4 15 5 00 5 25 550 TEMPERATURE C Vem V Vcc V V 11 OR V 35 DIFFERENTIAL MODE V 35 COMMON MODE IMPEDANCE V 35 COMMON MODE IMPEDANCE IMPEDANCE vs SUPPLY VOLTAGE VEe vs TEMPERATURE vs COMMON MODE VOLTAGE Vem 110 65 g 65 8 E 60 E 60 5 105 a 155 a 155 w B 100 Z 150 Z 150 c a a a a E z z 45 45 95 40 40 90 85 35 550 525 5 00 475 450 0 10 20 30 40 50 60 70 2 41 0 2 Vee V TEMPERATURE C Ven V V 35 COMMON MODE IMPEDANCE V
11. ese conditions V 35 EMI reduction For applications where EMI reduction is especially important the MXL1344A termination networks provide a pin for shunting common mode driver currents to GND Mismatches between the driver A and B output propagation delays can create a common mode distur bance on the cable This common mode energy can be shunted to GND by placing a 100pF capacitor to GND from the center tap of the T network termination R1C R2C and RSC as shown in Figure 5 V 28 Termination Most industry standard V 28 receivers including the MXL1543 do not require external termination because the receiver includes an internal 5kQ termination resis tor When the MXL 13444 is placed in V 28 mode all six of the termination networks are placed in a high Z mode In high Z mode the MXL1344A termination net works will not interfere with the MXL1543 s internal 5kQ termination In Figure 10 the MXL1344A and MXL1543 are placed in V 28 mode Switches S1 and S2 are opened on the MXL1344A to place the network in high Z mode Switch S3 is closed on the MXL 1543 to enable the 5kQ termi nating resistor A Complete X 21 Interface A complete DTE to DCE interface operating in X 21 mode is shown in Figure 11 The MXL 13444 terminates the V 11 clock and data signals The 1543 carries the clock and data signals and the MXL1544 MAX3175 carries the control signals The control signals generally do not require external termination 10 C
12. hree devices are identical allowing the MO M1 M2 and DCE DTE pins of each device to be connected to a single 4 wire control bus The MXL 1543 and MXL 1544 MAX3175 provide internal pullups for the four lines forcing them to the logic high state if they are not grounded This allows interface mode configuration by simply strapping the appropriate pins to ground in the interconnect cable In Figure 5 M1 M2 and DCE DTE are shorted to the cable ground forcing logic LOW on these control lines Input MO is left floating and will be pulled HIGH by internal pullups on the MXL1543 and MXL1544 MAXIM MAXIMA MXL1344A Figure 7 V 11 Termination and Internal Resistance Networks 8 MXL1543 RECEIVER MAXIM 5V Multiprotocol Software Selectable BALANCED GENERATOR 9 INTERCONNECTING gt CABLE Cable Terminator CABLE TERMINATION RECEIVER MAXIM MAXUM MXL1344A MXL1543 RECEIVER Figure 9 V 35 Termination and Internal Resistance Networks MAX3175 With this cable wiring the multiprotocol seri al port is set in RS 530A DTE mode Table 1 V 11 Termination A standard V 11 interface is shown in Figure 6 For high speed data transmission the V 11 specification recommends terminating the cable at the receiver with 1000 min resistor The resistor although not required preve
13. nts reflections from corrupting transmit ted data In Figure 7 the MXL1344A is used to terminate the V 11 receiver on the MXL 1543 Internal to the MXL1344A S1 is closed and S2 is open to present a 1040 typical dif ferential resistance and high Z common mode imped ance The MXL1543 s internal V 28 termination is disabled by opening S3 MAKIM The V 11 specification allows for signals with common mode variations of 7V and differential signal ampli tudes from 2V to 6V with data rates as high as 10Mbps The MXL1344A maintains termination impedance between 100Q and 110Q over these conditions V 35 Termination Figure 8 shows a standard V 35 interface The genera tor and the load must both present a 100Q 10Q differ ential impedance and a 1500 15Q common mode impedance The V 35 driver generates a current output 11mA typ that develops an output voltage between 440mV and 660mV across the load termination net works In Figure 9 the MXL1344A is used to implement the resistive T network that is needed to properly terminate Vere LIX MXL1344A 5V Multiprotocol Software Selectable Cable Terminator the V 35 receiver Internal to the MXL1344A S1 and S2 are closed to connect the T network resistors to the cir Cuit The V 35 specification allows for 4V of ground difference between the V 35 generator and V 35 load with data rates as high as 10Mbps The MXL1344A maintains cor rect termination impedance over th
14. ompliance Testing A European Standard EN 45001 test report for the 1543 MXL1544 MAX3175 and MXL1344A chipset will be available from Maxim upon completion of test ing Contact Maxim Quality Assurance for a copy of the report Chip Information TRANSISTOR COUNT 1 054 PROCESS TECHNOLOGY BiCMOS Pin Configuration TOP VIEW 1 2 DCE DTE LATCH R6B R6A R5A R5B Vcc GND 24 SSOP MAXIM 5V Multiprotocol Software Selectable Cable Terminator MAXIM MXL1543 MXL1344A RECEIVER DTE DCE SERIAL MAXIM MAXIM MAXIM MAXIM SERIAL CONTROLLER MXL1543 MXL1344A MXL1344A MXL1543 CONTROLLER TXD MAXIM MAXIM MXL1544 MAX3175 MXL1544 MAX3175 Figure 11 DTE to DCE X 21 Interface MAKINI 11 VPTELTXMW MXL1344A 5V Multiprotocol Software Selectable Cable Terminator Package Information ee INCHES MILLIMETERS DIM MIN MAX MIN MAX l 0 068 0 078 173 1 99 EE 0002 10 008 005 021 0 239 0 249 607 633 14L 0010 loots 1025 10 38 0 239 0249 607 6 33 16L 0 278 0 289 707 7 33 20L 7 7 SSOP EPS 0 004 0 00
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MAXIM MXL1344A Manual