SN74HC373NS

Overview

The SN74HC373AN is an octal transparent D-type latch with three-state outputs manufactured by Texas Instruments. It operates within a supply voltage range of 2 V to 6 V and supports an operating temperature from -40°C to 85°C. The device features high-current outputs capable of driving up to 15 LSTTL loads, making it suitable for buffer registers, I/O ports, bidirectional bus drivers, and working registers. Propagation delay ranges from 12 ns to 26 ns at 6 V, while static current is typically 8 µA.

Feature Summary

• High-current three-state true outputs designed for driving highly capacitive or low-impedance loads
• Transparent D-type latching mechanism where outputs follow data inputs when latch-enable is high
• Output-enable input controls normal logic states or high-impedance state without affecting internal latch operations

Applications

• Buffer registers
• I/O ports
• Bidirectional bus drivers
• Working registers

Procurement Notes

Verify the specific ordering suffix 'N' corresponds to the PDIP-20 tube package configuration. Confirm RoHS compliance status and lead finish details via the manufacturer's official documentation before procurement. Ensure the application environment remains within the specified -40°C to 85°C operating temperature range and 2 V to 6 V supply voltage limits.

Selection Notes

Select this component when high-drive capability is required for bus applications. The HC series offers standard CMOS performance with enhanced output current compared to basic logic families. Consider the PDIP-20 through-hole package if PCB assembly constraints require manual soldering or prototyping rather than surface-mount technology.

Part Context

This part belongs to the SN74HC373A family of octal transparent D-type latches. It shares functional characteristics with other variants in the series but differs in packaging and thermal properties. The N suffix specifically denotes the plastic dual-in-line package, distinguishing it from SOIC, SSOP, or TSSOP alternatives available within the same logical product line.

Replacement Considerations

SN74HC373NSR (SOP-20)

FAQ

How does the output-enable input affect latch operation?

The output-enable input places outputs in a high-impedance state but does not affect the internal operations of the latches. Data can be retained or entered while outputs are disabled.

What is the maximum load capacity of the outputs?

The high-current three-state true outputs are designed to drive up to 15 LSTTL loads.