SN74HC373APWR

Overview

The SN74HC373APWR 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 eight high-current true outputs capable of driving up to 15 LSTTL loads, making it suitable for highly capacitive or low-impedance applications. Packaged in a TSSOP-20 (PW) format, the component includes a latch-enable input for parallel data access and an output-enable input to control the high-impedance state without affecting internal latch operations.

Feature Summary

• Features eight high-current three-state true outputs designed to drive highly capacitive or relatively low-impedance loads.
• Transparent D-type latching mechanism allows Q outputs to follow D inputs while latch-enable is high, capturing data when latch-enable transitions low.
• Output-enable input places outputs in a normal logic state or a high-impedance state, enabling bus line driving without interface or pullup components.

Applications

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

Procurement Notes

Verify the specific ordering suffix 'PWR' corresponds to the TSSOP-20 package and tape-and-reel carrier configuration as documented in the manufacturer's official datasheet. Confirm that the RoHS compliance status and lead finish match the requirements of the target assembly process. Ensure the moisture sensitivity level rating aligns with the facility's reflow soldering capabilities and storage conditions prior to installation.

Selection Notes

Select this component when an octal latch with high-drive capability is required for interfacing with standard TTL loads. The HC logic family ensures compatibility with CMOS standards while providing sufficient current to drive multiple downstream devices. Consider the TSSOP-20 package dimensions if surface-mount space constraints are a primary design factor. Evaluate the propagation delay specifications against the system clock speed requirements to ensure timing margins are met under varying load capacitance conditions.

Part Context

This part belongs to the SN74HC373A series of octal transparent D-type latches. It shares functional characteristics with other variants in the family, such as the SN74HC373ADBR and SN74HC373AN, differing primarily in packaging style and shipping quantity. The device is part of the broader 74HC logic family, which provides standard digital logic functionality optimized for high-speed CMOS applications.

Replacement Considerations

Direct substitutes include SN74HC373ADBR and SN74HC373AN. Verify pinout compatibility and electrical specifications before substitution.

FAQ

How does the output-enable input affect the internal latch operation?

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

What is the maximum number of LSTTL loads the outputs can drive?

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