SN74ALS373AN

Overview

The SN74ALS373AN 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 maximum propagation delay of 16 ns at the upper voltage limit. The device provides a low-level output current capability of 24 mA and a high-level output current of -2.6 mA. Designed for through-hole mounting, it utilizes a 20-pin PDIP package and functions reliably across an operating temperature range of 0°C to +70°C.

Feature Summary

• Features eight latches in a single package designed for driving highly capacitive or relatively low-impedance loads.
• Includes buffered control inputs utilizing PNP technology to reduce DC loading on data lines.
• Provides a buffered output-enable input that places outputs in either normal logic states or a high-impedance state.

Applications

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

Procurement Notes

Verify the specific ordering suffix 'N' corresponds to the PDIP tube packaging configuration. Confirm the component status remains active production rather than obsolete. Ensure the selected variant meets the required commercial temperature range specifications for your application environment.

Selection Notes

Select this component when designing systems requiring parallel access for loading and high drive capabilities. Consider the ALS series characteristics for applications needing reduced DC loading on data lines compared to standard TTL families. Evaluate the 3-state output functionality for effective bus management without additional interface components.

Part Context

This part belongs to the SN54/74ALS373A family of octal transparent D-type latches. It shares functional similarities with the SN74AS373 but offers different electrical characteristics suited for specific load requirements. The device integrates multiple latching channels into a compact form factor suitable for dense circuit board layouts.

Replacement Considerations

SN74ALS373ADW (SOIC Package)

FAQ

How does the output-enable input affect internal operations?

The output-enable input places the outputs in a high-impedance state without affecting the internal operations of the latches, allowing data retention or entry while outputs are off.

What is the behavior of the Q outputs when the latch-enable input is low?

When the latch-enable input is taken low, the Q outputs are latched at the logic levels established at the D inputs at that moment.