LTC1344IG#TRPBF

Overview

The LTC1344IG#TRPBF 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, supporting RS232 (V.28), RS423 (V.10), RS422 (V.11), RS485, RS449, EIA530, EIA530-A, V.35, V.36, and X.21 standards. The device operates with a positive supply voltage (VCC) of 4.75V to 5.25V and a negative supply voltage (VEE) ranging from -5V to -13.2V. It features TTL-level logic inputs with an input high voltage threshold of 2V and an input low voltage threshold of 0.8V. The industrial grade variant supports an operating temperature range of -40°C to +85°C.

Feature Summary

• Software-controlled switching between multiple serial protocol termination configurations
• Outputs remain in high impedance state when power is off to prevent line loading
• Integrated data bus latch feature enables sharing of select lines across multiple interface ports

Applications

• Data networking equipment requiring flexible serial port configurations
• Channel Service Unit/Data Service Unit (CSU/DSU) implementations
• Data routers utilizing mixed-mode transceivers like the LTC1343

Procurement Notes

Verify that the specific suffix #TRPBF corresponds to tape and reel packaging if required by automated assembly processes. Confirm the 'I' designation indicates the industrial temperature range (-40°C to +85°C). Ensure the ordering information matches the manufacturer's current datasheet specifications before finalizing procurement.

Selection Notes

Select this component when designing multiprotocol serial interfaces that require dynamic reconfiguration of cable termination without hardware changes. It is suitable for applications needing support for various electrical standards including RS422 and V.35. Ensure the system design accommodates the necessary dual-supply voltage requirements for proper operation.

Part Context

This component belongs to the LTC1344 family of multiprotocol cable terminators. It is designed to work in conjunction with the LTC1343 mixed-mode transceiver to form a complete software-selectable serial port solution. The device simplifies the design of universal serial interfaces by eliminating the need for mechanical switches or custom cables for different protocols.

Replacement Considerations

The LTC1344A is a pin-compatible alternative within the same family that allows for separate RS449 mode configuration.