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 PackageApplication·Data Networking
·PCI Cards
·CSU and DSU
·Telecommunication Equipment
·Data Routers
·Data SwitchesPinout
SpecificationsAll Voltages to GND Unless Otherwise Noted
Supply Voltages
VCC.........................................................................-0.3V to +6V
VEE..........................................................................+0.3V to -7V
Logic Input Voltages
M0, M1, M2, DCE/DTE, LATCH.................................-0.3V to +6V
Termination Network Inputs
R_A, R_B ...............................................................-15V to +15V
R_A to R_B........................................................................±15V
Continuous Power Dissipation (TA = +70)
24-Pin SSOP (derate 8mW/ above +70) ..................640mW
Operating Temperature Range...............................0 to +70
Die Temperature ............................................................+150
Storage Temperature Range ............................-65 to +150
Lead Temperature (soldering, 10s) ................................+300
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.
DescriptionThe MXL1344A contains six software-selectable, multiprotocol 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 100 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 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 networks and expensive relays required for multiprotocol termination, saving space and cost.
The MXL1344A terminator is designed to form a complete +5V cable- or software-selectable multiprotocol DCE/DTE interface port when used with the MXL1543 and MXL1544/MAX3175 transceiver ICs. The MXL1344A terminator can use the VEE power generated by the MXL1543 charge pump, simplifying system design. The MXL1344A, MXL1543, and MXL1544/MAX3175 are pinfor- pin compatible with the LTC1344A, LTC1543, and LTC1544, but for proper operation the entire Maxim chipset must be used without substituting other manufacturer's parts on a chip-by-chip basis.
The MXL1344A is available in a 24-pin SSOP package and is specified for the 0 to +70 commercial temperature range.
MXL1344A Data Sheet
