SN74ALS667NT3

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS667NT3 is an 8-bit D-type transparent read-back latch with 3-state outputs manufactured by Texas Instruments. It belongs to the ALS logic series and features inverting logic, where Q outputs provide the inverse of the data applied to its D inputs. The device includes preset and clear inputs for control. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating free-air temperature range from 0°C to 70°C. The package is a standard plastic 300-mil DIP.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Provides 3-state I/O-type read-back inputs allowing stored data to be read back onto the input data bus via the OERB control.
• Features a bus-structured pinout designed specifically for storing contents of the input data bus and reading back stored data.
• Includes dedicated preset and clear inputs for direct control of the latch state.

Buffers, Drivers, Receivers, Transceivers Applications

• Bus-structured applications requiring data storage and retrieval
• Systems utilizing 3-state buffer-type outputs for bus isolation
• Digital circuits needing transparent latching with inverted output logic

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific NT3 suffix against current TI documentation, as datasheets primarily list DW and NT packages. Confirm availability status, as older ALS series components may have limited production or obsolescence risks. Ensure the ordering suffix matches the required tape-and-reel or tube packaging format specified in the latest Package Option Addendum.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when inverting logic is required for 8-bit data latching. Compare propagation delays and power consumption against other ALS variants if speed or efficiency is critical. Verify that the 300-mil DIP package fits the target PCB layout constraints. Ensure the application environment stays within the 0°C to 70°C operating temperature range.

Buffers, Drivers, Receivers, Transceivers Part Context

This part is part of the SN74ALS666/667 family of 8-bit D-type transparent read-back latches. The SN74ALS667 variant specifically provides inverted outputs, whereas the SN74ALS666 offers true outputs. Both share identical pinouts and functional characteristics except for the output polarity. They are designed for high-speed digital applications requiring bus-oriented data handling.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74ALS667DW (SOIC-24 package) offers the same electrical functionality in a surface-mount format. SN74ALS666NT3 is functionally similar but provides non-inverting (true) outputs instead of inverted ones. Verify pin compatibility and output polarity requirements before substituting.