SN74ALS373ANS

Overview

The SN74ALS373ANS is an octal transparent D-type latch with 3-state outputs manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and supports a commercial temperature range of 0°C to 70°C. The device features buffered control inputs and PNP inputs that reduce DC loading on data lines. Propagation delay from D to Q ranges from 2 ns to 17 ns, while the LE to Q delay spans 6 ns to 29 ns under specified load conditions. Low-level output current reaches up to 24 mA, and high-level output current is rated at -2.6 mA.

Feature Summary

• Features three-state outputs designed for driving highly capacitive or low-impedance loads without requiring interface components.
• Includes a buffered output-enable input to place outputs in normal logic states or high-impedance states independently of internal latch operations.
• Utilizes PNP inputs to minimize DC loading on data lines during parallel access.

Applications

• Implementing buffer registers
• Configuring I/O ports
• Building bidirectional bus drivers
• Serving as working registers

Procurement Notes

Verify the specific ordering suffix 'NS' corresponds to the SOP package variant when sourcing. Confirm RoHS compliance status and lead finish details via the manufacturer's official packaging addendum. Ensure the procurement channel provides valid traceability documentation consistent with standard warranty terms.

Selection Notes

Select this component for designs requiring octal latching with high-drive capabilities. Verify that the system voltage remains within the 4.5 V to 5.5 V operating range. Consider the propagation delay specifications relative to the target clock frequency and setup/hold time requirements for reliable data capture.

Part Context

This part belongs to the SN74ALS373A series of octal transparent D-type latches. It shares functional similarities with the SN74AS373 but differs in electrical characteristics such as drive strength and switching speed. The device is available in multiple packages including SOIC (DW), PDIP (N), and SOP (NS).

Replacement Considerations

SN74ALS373ADW serves as a tube-packaged alternative in the same SOIC family. SN74ALS373AN offers a through-hole PDIP option. SN74ALS373ADWR provides a tape-and-reel version of the SOIC package.

FAQ

How does the output-enable input affect internal latch operations?

The output-enable input places the outputs in a high-impedance state but does not affect the internal operations of the latches, allowing data retention or entry while outputs are disabled.

What is the function of the latch-enable input?

When the latch-enable input is high, the Q outputs follow the D inputs. When taken low, the Q outputs are latched at the logic levels present at the D inputs.