SN74ALS667NT

Overview

The SN74ALS667NT is an 8-bit D-type transparent read-back latch with 3-state outputs manufactured by Texas Instruments. It features inverted logic outputs and operates within a supply voltage range of 4.5 V to 5.5 V. The device supports a bus-structured pinout and includes preset and clear inputs for control. Propagation delays vary from 1 ns to 29 ns depending on the signal path. It is characterized for operation in temperatures ranging from 0°C to 70°C and is housed in a standard plastic 300-mil DIP package.

Feature Summary

• Provides read-back capability through dedicated I/O-type read-back inputs, allowing stored data to be routed back onto the input data bus.
• Features 3-state outputs controlled by separate enable inputs, facilitating use in bus-structured applications.
• Includes preset and clear inputs for direct control of latch states independent of the data input.

Applications

• Bus-structured memory storage applications
• Data latching with simultaneous read-back verification
• I/O interface buffering

Procurement Notes

Verify component authenticity and physical condition upon receipt. Confirm that the package matches the specified standard plastic 300-mil DIP form factor. Ensure handling procedures comply with electrostatic discharge precautions appropriate for TTL-compatible logic devices.

Selection Notes

Select this component when inverted output polarity is required alongside transparent latching functionality. The SN74ALS667NT is distinct from the SN74ALS666, which provides true (non-inverted) outputs. Both share identical pinouts and electrical characteristics except for output phase.

Part Context

This part belongs to the SN74ALS66x series of 8-bit D-type transparent read-back latches. It shares the same functional architecture as the SN74ALS666 but differs in output logic polarity. The series utilizes Advanced Low-power Schottky technology for improved speed and power consumption compared to standard LS logic families.

Replacement Considerations

SN74ALS666NT serves as a functional substitute if non-inverted outputs are acceptable.