NXP Semiconductors 74HC597DB,112

Overview

74HC597DB,112 from Nexperia is an 8-bit parallel-in/serial-out shift register with integrated input flip-flops and dual-edge-controlled storage and shift registers. It features separate positive-edge-triggered STCP (storage clock) and SHCP (shift clock), asynchronous MR (master reset), and PL (parallel load) control. Operates from 2.0 V to 6.0 V supply, supports -40 °C to +125 °C ambient range, and delivers 35 MHz max clock frequency at 6.0 V - used in industrial I/O expansion and microcontroller peripheral interfacing.

For engineers reviewing the 74HC597DB,112 datasheet, 74HC597DB,112 pinout, 74HC597DB,112 application, or 74HC597DB,112 equivalent, key selection criteria include dual-clock timing independence, TTL-compatible input thresholds (via 74HCT597 variant), propagation delay consistency across temperature, latch-up immunity (>100 mA), and SO16 package compatibility with legacy PCB footprints.

Technical Context

The device implements a two-stage architecture: an 8-bit parallel-access storage register feeding a serial-shift register, both edge-triggered but independently clocked (STCP for parallel capture, SHCP for serial shifting). This decouples data acquisition from serial transmission, enabling glitch-free sampling of asynchronous inputs before synchronized bitstream output.

Functional isolation is reinforced by dedicated active-low PL (parallel load) and MR (asynchronous master reset), plus direct DS (serial data input) and Q (serial output) paths. Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors - critical in mixed-voltage system interconnects.

Key Specifications

Pinout & Package

74HC597DB,112 is supplied in SO16 (SOT109-1) plastic small outline package: 16-pin, 3.9 mm body width, 1.27 mm lead pitch, gull-wing leads. RoHS-compliant, surface-mountable, and compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit parallel-in/serial-out shift register applications.

Compared with 74HCT597DB,112, the 74HC597DB,112 offers superior noise immunity in CMOS systems but requires higher VIH; versus SN74LV595APWR, it provides true parallel-load/shift separation essential for jitter-sensitive sampling - a functional distinction not addressable by configuration alone.

Availability

74HC597DB,112 is available at Aetrix Electronics and suitable for industrial I/O expansion, microcontroller peripheral interface, and test equipment data capture requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC597DB,112 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert delivering high-performance, reliable logic, analog, and MOSFET solutions optimized for efficiency, size, and thermal performance.

The 74HC597 product line targets industrial and automotive-adjacent applications requiring robust, wide-supply-voltage shift registers with proven latch-up immunity and extended temperature operation - designed for reliability in harsh electrical environments.

FAQ

What is the difference between STCP and SHCP in the 74HC597DB,112?

STCP (Storage Register Clock) captures the parallel D0–D7 inputs into an internal latch on its rising edge; SHCP (Shift Register Clock) advances the shift register and updates the Q output on its rising edge. These clocks operate independently - allowing data to be acquired and held before being serially shifted out, eliminating race conditions in time-critical sampling.

Can the 74HC597DB,112 interface directly with 3.3 V microcontrollers?

Yes - the 74HC597DB,112 operates down to 2.0 V and has VIH = 1.35 V (min) at VCC = 4.5 V, making it compatible with 3.3 V logic outputs. When powered at 3.3 V, VIH is ~2.3 V (70% of VCC), ensuring reliable recognition of 3.3 V MCU GPIO HIGH states without level translation.

Does the 74HC597DB,112 support daisy-chaining for multi-byte serial data?

Yes - the Q output connects directly to the DS input of the next device. With shared SHCP and MR lines and cascaded PL/STCP control, multiple 74HC597DB,112 units can form an N×8-bit shift chain. Propagation delay adds linearly (e.g., 2× devices → ~46 ns max STCP→Q at 4.5 V), preserving timing integrity up to 16–24 bits.

Is the 74HC597DB,112 pin-compatible with older 74LS597 or 74ALS597 variants?

No - while functionally similar, the 74HC597DB,112 uses SO16 (SOT109-1) packaging and differs electrically: LS/ALS versions require 5 V only, draw higher current, lack input clamps, and have slower propagation delays (~25–40 ns). Physical pinout matches, but voltage and timing constraints prevent drop-in replacement without redesign.