74F899QCX

Overview

The Fairchild Semiconductor 74F899QCX is a high-speed CMOS logic device belonging to the F/FAST series. It functions as an 8-bit latchable transceiver with integrated parity generation and checking capabilities. The component utilizes a 20-pin SOIC package and operates within a standard voltage range typical for this logic family. Key electrical parameters include a maximum operating frequency of 80 MHz and a maximum output current capability of 20 mA, ensuring reliable data transmission in digital systems.

Feature Summary

• Integrates 8-bit data latching with simultaneous parity generation or checking functionality
• Supports bidirectional data transfer between A and B buses with independent control
• Provides selectable odd or even parity modes via dedicated configuration pin
• Features distinct error signal outputs for real-time parity verification

Applications

• High-speed data bus interfaces requiring error detection
• Memory systems utilizing latchable transceivers
• Digital communication protocols demanding parity integrity checks

Procurement Notes

Verify the specific suffix 'QCX' against official Fairchild or ON Semiconductor documentation to confirm package type and tape-and-reel specifications. Ensure compatibility with existing board layouts regarding the SOIC-20 footprint. Confirm RoHS compliance status through the manufacturer's latest environmental declarations before procurement.

Selection Notes

Select this component when system design requires both data latching and hardware-based parity checking within a single IC. Compare propagation delays and power consumption against alternative F/FAST series devices. Ensure the required I/O drive strength meets the load capacitance requirements of the connected circuitry.

Part Context

This part belongs to the 74F series of high-speed CMOS logic, designed for applications requiring faster switching speeds than standard LS logic. It serves as a functional equivalent to older TTL parity transceivers while offering lower power consumption. The device simplifies system architecture by combining data storage and error checking functions.

Replacement Considerations

The 74ACT899QC is a documented similar part number offering comparable 9-bit parity transceiver functionality. Verify pinout compatibility and voltage level differences before substitution. Check if the additional bit width affects the specific application requirements.