SN74HC373N

Overview

The SN74HC373N 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 bus-oriented applications. Propagation delay ranges from 12 ns to 26 ns at 6 V, depending on load conditions. Static current is typically 8 µA at 6 V.

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 while 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 package when sourcing. Confirm RoHS compliance status as indicated in the manufacturer's documentation. Ensure the application environment remains within the specified -40°C to +85°C operating temperature range. Validate that power supply voltages do not exceed the absolute maximum ratings to prevent permanent damage.

Selection Notes

Select this component for designs requiring parallel access loading and bus-driven architectures. The HC series offers compatibility with standard CMOS logic levels. Consider the propagation delay specifications relative to system clock speeds. Verify that the required output drive current aligns with the high-current capabilities of the three-state outputs.

Part Context

This part belongs to the SN74HC373A family of octal transparent D-type latches. It shares functional similarities with other 74HC series devices but is specifically optimized for bus-oriented applications. The N suffix denotes the plastic dual-in-line package format, distinguishing it from surface-mount variants like DB or PW.

Replacement Considerations

Direct replacements include SN74HC373ADBR (SSOP) and SN74HC373APWR (TSSOP). Cross-manufacturer equivalents may exist but require verification of pinout and electrical characteristics.