SN74ALS994DW

Overview

The SN74ALS994DW is a 10-bit transparent D-type latch manufactured by Texas Instruments in the ALS logic series. It features a bus-structured pinout and provides true logic outputs with I/O-type read-back capabilities. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range from 0°C to 70°C. It is housed in a 24-pin Small-Outline (SOIC) package.

Feature Summary

• Transparent D-type latches allow Q outputs to follow data inputs while the latch-enable input is high
• Read-back capability enables stored data to be routed back onto the input data bus via the output-enable input
• Bus-structured pinout facilitates efficient integration into parallel data systems

Applications

• Storing contents of input data buses
• Reading back stored data onto input data buses
• Parallel data storage applications requiring bidirectional I/O control

Procurement Notes

Verify the specific ordering suffix against the manufacturer's Package Option Addendum to confirm lead finish, moisture sensitivity level, and packaging quantity. Ensure the selected variant matches the required operational temperature range and RoHS compliance status for your design specifications.

Selection Notes

Select this component when a 10-bit latch with simultaneous read-back functionality is required. The ALS series offers faster switching speeds compared to standard LS logic. Verify that the system can manage potential bus conflicts during the read-back operation as specified in the timing diagrams.

Part Context

This part belongs to the Texas Instruments SN74ALS family of advanced low-power Schottky logic devices. These components are designed for high-speed digital applications requiring reduced power consumption. The SN74ALS994 specifically addresses needs for data storage with direct feedback to the input bus structure.

Replacement Considerations

SN74ALS994NT