74ABT899CSCX

Overview

The Fairchild Semiconductor 74ABT899CSCX is a 9-bit transparent latch transceiver with parity generation and checking capabilities. It operates within a 4.5V to 5.5V supply voltage range and features a 28-pin SOIC package. The device provides a 64 mA output sink current and supports independent latching for A-B and B-A directions. It includes ODD/EVEN selection pins and ERR outputs for error detection, ensuring glitch-free bus loading during power-up and power-down cycles.

Feature Summary

• Supports bidirectional data transfer with simultaneous parity generation and checking across two 8-bit buses plus one parity bit.
• Features independent latch enable controls for separate A-to-B and B-to-A data paths.
• Provides configurable odd or even parity modes via dedicated selection pins.
• Ensures high-impedance state without glitches on the bus throughout power-on and power-off transitions.

Applications

• High-speed memory interface systems requiring data integrity verification
• Bus-oriented transmitter and receiver circuits in industrial control environments
• Data acquisition systems utilizing parallel communication protocols

Procurement Notes

Verify the specific suffix 'X' indicates tape and reel packaging when sourcing this component. Confirm the manufacturer origin as Fairchild Semiconductor or its successor entities, noting that corporate acquisitions may affect part availability and documentation sources. Ensure compatibility with existing system voltage levels and logic families before integration into new designs.

Selection Notes

Select this component for applications requiring integrated parity checking alongside standard data transmission. It serves as a functional replacement for legacy devices like the 543, 280, 657, and 373 without necessitating changes to tri-state logic configurations. Consider the 28-pin SOIC footprint for PCB layout constraints and verify thermal requirements for the operating temperature range.

Part Context

This device belongs to the ABT logic family, characterized by advanced BiCMOS technology for high-speed operation. It is designed to replace older TTL-based parity generators and transceivers while offering improved switching speeds and lower power consumption. The 74ABT899 integrates both latch and transceiver functions into a single package to reduce board space.

Replacement Considerations

Publicly confirmed substitute part numbers include SN74ABT899 variants from Texas Instruments. Verify pinout compatibility and electrical specifications against original design requirements before substitution.