LTC1344IG#PBF

Overview

The LTC1344IG#PBF is a software-selectable multiprotocol cable terminator housed in a 24-lead SSOP package. It provides six configurable termination circuits supporting RS232, RS423, RS422, RS485, V.35, and other standards. The device operates on dual supplies of +5V (VCC) and -5V (VEE). Key electrical parameters include a supply current ranging from 200mA to 700mA, a V.11 differential mode impedance of 100Ω to 110Ω, and a V.35 differential mode impedance of 90Ω to 110Ω. Logic inputs require a minimum high voltage of 2V and a maximum low voltage of 0.8V. The component ensures outputs do not load the line when power is off.

Feature Summary

• Software-controlled configuration for multiple serial interface protocols
• Integrated data bus latch feature for sharing select lines across ports
• High-impedance output state during power-off conditions

Applications

• Data networking equipment
• Channel Service Unit/Data Service Unit (CSU/DSU)
• Data routers

Procurement Notes

Verify that the ordering suffix #PBF indicates the lead-free tape-and-reel or tube variant as specified by Analog Devices. Confirm the 'I' grade designation matches the required industrial temperature range of –40°C to 85°C. Ensure the 24-lead SSOP footprint aligns with the PCB layout specifications provided in the datasheet package drawings.

Selection Notes

Select this component when designing multiprotocol serial interfaces requiring automatic termination switching. It is intended to be paired with transceivers like the LTC1343 to form complete interface ports. Consider the shared select line capability if multiple ports are present in the design. Verify that the system logic levels meet the specified VIH and VIL requirements for reliable mode selection.

Part Context

This part belongs to the LTC1344 family of cable terminators. It is functionally similar to the LTC1344A but utilizes a different Mode Selection table. The device complements the LTC1343 mixed-mode transceiver to create comprehensive serial port solutions. Related components in the ecosystem include the LTC1543 and LTC1544 for additional transceiver capabilities.

Replacement Considerations

The LTC1344A is a pin-compatible alternative within the same family. Note that the Mode Selection table differs between the LTC1344 and LTC1344A; verify compatibility with existing control logic before substitution.