74HC597D,653

Overview

The Nexperia 74HC597D,653 is an 8-bit shift register with input flip-flops, housed in a 16-lead SO16 (SOT109-1) plastic small outline package. It operates within a supply voltage range of 2.0 V to 6.0 V and supports ambient temperatures from -40 °C to +125 °C. The device features positive edge-triggered clocks for both the storage and shift registers, along with direct load and clear inputs. Propagation delays vary by clock source and voltage; for instance, SHCP to Q delay ranges from 30 ns to 53 ns across the operating voltage spectrum.

Feature Summary

• Features an 8-bit parallel storage register feeding a serial-out shift register with independent positive edge-triggered clocks.
• Includes direct overriding load and clear functions for immediate data control and state management.
• Incorporates input clamp diodes to facilitate interfacing with voltages exceeding VCC using current limiting resistors.

Applications

• Parallel-to-serial data conversion circuits
• Serial-to-parallel expansion for microprocessor systems
• Digital signal processing interfaces requiring data buffering

Procurement Notes

Verify the specific suffix '653' corresponds to the SO16 package variant when sourcing. Confirm that the application environment remains within the specified -40 °C to +125 °C temperature range. Ensure supply voltage does not exceed 6.0 V to maintain operational integrity. Check for RoHS compliance documentation if required by project specifications.

Selection Notes

Select this component when an 8-bit shift register with input latching is required in a surface-mount SO16 package. It is suitable for designs needing wide voltage operation between 2.0 V and 6.0 V. Consider the propagation delay characteristics relative to the system clock speed. Verify compatibility with CMOS logic levels for the HC series functionality.

Part Context

This part belongs to the 74HC/HCT logic family, specifically the 74HC597 series. It is manufactured by Nexperia USA Inc. and is designed for general-purpose digital logic applications. The device is distinct from automotive-qualified variants which carry different suffixes and testing standards.

Replacement Considerations

Direct substitutes include other 74HC597 variants from different manufacturers offering identical pinouts and electrical specifications. Ensure any replacement maintains the SO16 package form factor and meets the same voltage and temperature ratings.

FAQ

What is the function of the PL input?

The PL (Parallel Load) input is active LOW. When asserted, it loads data from the parallel inputs (D0-D7) directly into the shift register on the next rising edge of the SHCP clock.

How does the MR input operate?

The MR (Master Reset) input is asynchronous and active LOW. Asserting it clears the shift register outputs regardless of the clock states, forcing all Q outputs to a low state.