LTC1344ACG#TRPBF

Overview

The LTC1344ACG#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 standards including RS232 (V.28), RS423 (V.10), RS422 (V.11), RS485, RS449, EIA530, V.35, and X.21. The device operates on a single positive supply voltage of 4.75V to 5.25V and a negative supply voltage of -5V ± 5%. It features TTL-level logic inputs with a latch function to allow shared control lines across multiple ports.

Feature Summary

• Software-configurable termination networks for multiple serial communication protocols
• Outputs remain high impedance to prevent line loading when power is removed
• Integrated data bus latch feature enables sharing of select lines between multiple interface ports

Applications

• DTE or DCE multiprotocol serial interfaces with DB-25 connectors
• Channel Service Unit/Data Service Unit (CSU/DSU) implementations
• Data networking routers requiring flexible physical layer configuration

Procurement Notes

Verify the specific suffix 'CG' corresponds to the commercial temperature range (0°C to 70°C) as defined in the manufacturer's ordering guide. Confirm that the '#TRPBF' designation indicates tape and reel packaging compatible with automated surface-mount assembly processes. Ensure the component meets RoHS compliance requirements for the target market.

Selection Notes

Select this component when designing systems requiring hardware-level protocol switching without mechanical relays. It is suitable for applications needing simultaneous support for differential and single-ended signaling standards. Consider the LATCH pin functionality if multiple terminators share a common microcontroller bus to prevent signal contention during mode transitions.

Part Context

This part belongs to the LTC1344 family of multiprotocol interface components. It serves as the termination stage for serial data links, complementing transceivers such as the LTC1343 or LTC1543. Unlike general-purpose resistors, it integrates complex T-networks and switch matrices specifically tuned for electrical standard compliance.

Replacement Considerations

The LTC1344 is a functional predecessor with different mode selection logic. Verify compatibility by comparing the Mode Selection tables in both datasheets. No direct pin-for-pin replacements are documented; system redesign may be required for alternative devices.