SN74HC373PWRE4

Overview

The SN74HC373PWRE4 is an octal transparent D-type latch with three-state outputs manufactured by Texas Instruments. It features eight high-current latches in a single package, designed to drive highly capacitive or low-impedance loads. The device operates within a supply voltage range of 2 V to 6 V and supports an operating temperature range from -40°C to +85°C. It utilizes a TSSOP-20 surface-mount package. Propagation delays vary based on voltage: maximums are 155 ns at 2 V, 44 ns at 4.5 V, and 37 ns at 6 V (CL=150 pF). Static current is typically 8 µA at 6 V.

Feature Summary

• Features eight high-current true outputs capable of driving up to 15 LSTTL loads.
• Provides full parallel access for loading data into the internal latches.
• Includes an output-enable input that places outputs in a normal logic state or a high-impedance state.

Applications

• Implementing buffer registers
• Designing I/O ports
• Creating bidirectional bus drivers
• Functioning as working registers

Procurement Notes

Verify the specific ordering suffix 'E4' against the manufacturer's latest documentation to confirm lead-free status and RoHS compliance details. Confirm the package type matches the required PCB footprint. Ensure the component status is checked for availability as manufacturing lifecycles may change.

Selection Notes

Select this component when an octal latch with high-drive capability is required for bus applications. Consider the propagation delay specifications relative to the system clock speed and load capacitance. Verify that the 2 V to 6 V supply voltage range aligns with the target circuit design requirements.

Part Context

This part belongs to the SN74HC373A family of octal transparent D-type latches. It is distinct from other variants by its specific tape-and-reel packaging configuration indicated by the PWRE4 suffix. The device is part of the broader HC logic series known for CMOS compatibility and wide supply voltage operation.

Replacement Considerations

Direct replacements include SN74HC373APWR. Verify pinout and electrical characteristics match before substitution.

FAQ

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

The output-enable input does not affect the internal operations of the latches. Old data can be retained or new data can be entered while the outputs are off.

What is the function of the latch-enable input?

While the latch-enable input is high, the Q outputs follow the data inputs. When taken low, the Q outputs are latched at the levels set up at the D inputs.