SN74AS373N

Overview

The SN74AS373N 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 operating temperature range of 0°C to 70°C. The device features a propagation delay from data input (D) to output (Q) ranging from 3.5 ns to 6 ns. It provides high drive capability with a low-level output current of up to 48 mA and a high-level output current of -15 mA. Packaged in a 20-pin PDIP, it includes buffered control inputs and pnp inputs to reduce DC loading on data lines.

Feature Summary

• Features three-state bus-driving true outputs designed for driving highly capacitive or relatively low-impedance loads without interface components.
• Incorporates pnp inputs to significantly reduce DC loading on data lines while maintaining full parallel access capabilities.
• Includes a buffered output-enable input that places outputs in a high-impedance state without affecting internal latch operations.

Applications

• Implementing buffer registers
• I/O port implementations
• Bidirectional bus drivers
• Working registers

Procurement Notes

Verify the specific ordering suffix 'N' corresponds to the PDIP package and tube packaging configuration as listed in the official datasheet. Confirm the RoHS status and lead finish details via the manufacturer's latest packaging addendum. Ensure the procurement channel sources production data consistent with the SDAS083C specification revision. Cross-reference the part marking 'SN74AS373N' against physical units received to guarantee authenticity and correct series identification.

Selection Notes

Select this component when high-speed latching with strong drive capability is required for bus applications. The AS series offers faster switching speeds compared to ALS variants but consumes higher static current. Verify that the 4.5 V to 5.5 V supply requirement aligns with the system design. Consider the 20-pin PDIP package constraints if surface mount alternatives like the NS or DW packages are preferred for automated assembly processes.

Part Context

This device belongs to the SN54/74AS logic family, characterized by advanced Schottky technology for high speed. It is functionally similar to the SN74ALS373A but provides superior drive strength and slightly different timing characteristics. The octal latch architecture allows eight independent D-type latches to operate simultaneously under common control signals, simplifying digital data storage and transfer designs.

Replacement Considerations

Direct substitutes include the SN74ALS373AN for lower power consumption applications, though with reduced drive current. For surface mount requirements, the SN74AS373DW (SOIC) or SN74AS373NSR (SOP) offer equivalent electrical performance in alternative packages. Verify pinout compatibility and thermal management requirements when transitioning between package types.