SN74ALS994NT

Overview

The SN74ALS994NT is a 10-bit transparent D-type latch from the Texas Instruments ALS logic family, housed in a 24-pin plastic dual in-line package (PDIP). It operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range of 0°C to 70°C. The device features bus-structured pinouts with true logic outputs and I/O-type read-back inputs controlled by the OERB signal.

Feature Summary

• Transparent data storage capability allowing Q outputs to follow D inputs while the latch-enable signal is high
• Read-back functionality that routes stored data back onto the input data bus when output-enable is asserted low
• Bus-structured pinout design facilitating direct connection to system data buses

Applications

• Data bus interface circuits requiring bidirectional data flow
• System memory latching for temporary data retention
• Microprocessor-based systems utilizing bus-structured architectures

Procurement Notes

Verify component authenticity through authorized distributors or TI directly. Confirm the specific NT suffix indicates the standard plastic DIP package variant. Ensure compliance with RoHS standards as specified in the packaging information. Validate that the device status aligns with current lifecycle requirements before procurement.

Selection Notes

Select this component for applications requiring ten simultaneous data latches with read-back capabilities. Consider the ALS series characteristics for speed and power consumption relative to other logic families. Verify that the 24-pin PDIP package fits the target PCB layout constraints and thermal requirements.

Part Context

This part belongs to the SN74ALS994 family of 10-bit latches manufactured by Texas Instruments. It is designed for high-speed digital applications requiring efficient data storage and retrieval on shared buses. The device integrates both standard latch functions and specialized read-back control within a single integrated circuit.

Replacement Considerations

SN74ALS994DW is the SOIC package equivalent.