SN74ALS29854DW

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS29854DW is an 8-bit to 9-bit parity bus transceiver manufactured by Texas Instruments in a 24-pin SOIC package. It operates within a supply voltage range of 4.75 V to 5.25 V and supports data transfer between A and B buses with integrated parity generation or checking. The device features open-collector outputs for the parity-error flag (ERR) and inverted parity output (PARITY). Propagation delays are specified at 8 ns maximum for data paths under 50 pF load conditions, while control-to-output delays reach up to 25 ns.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Integrates 8-bit to 9-bit parity generation and checking capabilities for bidirectional bus communication
• Provides open-collector outputs for error-flag indication and inverted parity signaling
• Includes latch functionality to store, sample, pass, or clear error flags via dedicated control inputs

Buffers, Drivers, Receivers, Transceivers Applications

• Two-way communication systems requiring parity verification on data buses
• Digital logic circuits needing integrated error detection and storage mechanisms
• System diagnostic applications utilizing forced inverted parity error conditions

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix against the manufacturer's current production status documentation. Confirm that the component meets RoHS compliance requirements as defined in the official packaging addendum. Ensure the selected package variant matches the required pin count and physical dimensions for the target PCB layout.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when designing systems that require simultaneous data transmission and parity validation across two independent buses. Consider the open-collector nature of the ERR output when determining pull-up resistor values for the error flag circuitry. Evaluate the propagation delay specifications relative to the system clock speed to ensure timing margins are maintained.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the Texas Instruments ALS logic family, characterized by high-speed operation and low power consumption compared to standard TTL equivalents. The SN74ALS29854 serves as a functional equivalent to AMD's AM29854, providing compatibility for designs transitioning between manufacturers while maintaining identical pinouts and logical operations.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74ALS29854DWR

Buffers, Drivers, Receivers, Transceivers FAQ

How does the device handle parity errors during data transmission?

When transmitting from the B bus to the A bus, the device checks the incoming parity bit. If an error is detected, the open-collector ERR output indicates the fault, which can then be stored, sampled, passed, or cleared using the LE and CLR control inputs.

What is the function of the inverted parity output?

Inverted parity is generated when both OEA and OEB are low and data transfers from the A bus to the B bus. This condition acts as a forced error state, providing designers with additional system diagnostic capability.