SN74HCT373N

Latches Overview

The SN74HCT373N 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 features high-current true outputs capable of driving up to 15 LSTTL loads. The device provides ±6-mA output drive at 5 V and maintains low input current of 1 μA maximum, ensuring TTL-voltage compatibility. Typical propagation delay is 21 ns. It is housed in a 20-pin PDIP package and supports full parallel access for loading data.

Latches Feature Summary

• Features eight high-current latches in a single package designed for driving highly capacitive or low-impedance loads.
• Provides 3-state outputs that can drive bus lines without interface or pullup components.
• Inputs are TTL-voltage compatible with low power consumption.

Latches Applications

• Implementing buffer registers
• I/O ports
• Bidirectional bus drivers
• Working registers

Latches Procurement Notes

Verify the specific ordering suffix 'N' corresponds to the 20-pin PDIP package when sourcing. Confirm RoHS compliance status as indicated in the manufacturer's documentation. Ensure the operating temperature range meets system requirements, as catalog versions typically support -40°C to +85°C. Cross-reference the datasheet revision history for any recent changes to electrical characteristics or thermal resistance values before finalizing procurement specifications.

Latches Selection Notes

Select this component when TTL-compatible inputs and high-drive capability are required for bus applications. The HCT logic family ensures compatibility with standard TTL logic levels while offering CMOS power efficiency. Consider the 20-pin PDIP package for through-hole prototyping or manufacturing needs. Verify that the 4.5 V to 5.5 V supply voltage range aligns with the target system power rails.

Latches Part Context

This part belongs to the SNx4HCT373 family of octal transparent D-type latches with 3-state outputs. Other variants include SOIC (SN74HCT373DW), TSSOP (SN74HCT373PW), and military-grade SN54HCT373 versions. The family shares identical logical functionality but differs in packaging, thermal characteristics, and operating temperature ranges depending on the specific suffix and series designation.

Latches Replacement Considerations

Direct pin-to-pin replacements within the same package include SN74HCT373NE4. For different packages, consider SN74HCT373DWR (SOIC) or SN74HCT373PWR (TSSOP). Ensure functional equivalence regarding 3-state outputs and latch transparency when substituting across package types.

Latches FAQ

How does the OE input affect internal latch operations?

The output-enable (OE) 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 behavior of the Q outputs when LE is low?

When the latch-enable (LE) input is taken low, the Q outputs are latched at the levels that were set up at the D inputs.