LTC1344CG#PBF

Overview

The LTC1344CG#PBF is a software-selectable cable terminator manufactured by Analog Devices Inc. in a 24-lead SSOP package. It provides six configurable termination networks for multiprotocol serial interfaces including RS232, RS423, RS422, RS485, RS449, EIA530, V.35, and X.21. The device operates on a single 5V supply with a typical current consumption of 200mA. Logic inputs require a minimum high voltage of 2V and a maximum low voltage of 0.8V. Termination impedances include approximately 103Ω differential for V.11 and specific T-network configurations for V.35.

Feature Summary

• Software-controlled configuration of six independent cable termination networks
• Supports multiple electrical standards including RS232, RS422, and V.35
• Outputs remain in high impedance state to prevent line loading when power is removed
• Integrated data bus latch allows sharing of control lines across multiple interface ports

Applications

• Data networking equipment requiring multiprotocol compatibility
• Channel Service Unit (CSU) and Data Service Unit (DSU) implementations
• Data routers supporting various serial communication standards

Procurement Notes

Verify the component authenticity through authorized Analog Devices distributors or certified suppliers. Confirm the presence of the #PBF suffix indicates lead-free compliance and RoHS adherence. Ensure the 24-lead SSOP package matches the design footprint requirements before finalizing procurement orders.

Selection Notes

Select this component when designing multiprotocol serial interfaces that require dynamic switching between different cable termination standards. It is suitable for applications needing software-controlled impedance matching without mechanical relays. Consider pairing with the LTC1343 transceiver for complete port functionality.

Part Context

This part belongs to the LTC1344 series of multiprotocol cable terminators. It is designed to work alongside the LTC1343 mixed-mode transceiver to form a complete software-selectable serial port solution. The series addresses the complexity of managing diverse serial interface standards within a single hardware platform.

Replacement Considerations

The LTC1344A is a pin-compatible alternative within the same family that allows for separate RS449 mode configuration. Verify functional equivalence regarding termination impedance values and logic input thresholds before substituting.