The MM74HC595MX is a high‑speed CMOS 8‑bit serial‑in parallel‑out shift register with latch and cascading capability
Specifications
Manufacturer:
Onsemi
Product Number:
MM74HC595MX
Description:
IC SR TRI-STATE 8BIT 16-SOIC
Introduction
MM74HC595MX - 8-Bit Serial-In Parallel-Out Shift Register with Latch
The MM74HC595MX is a high-speed CMOS 8-bit serial-in parallel-out shift register with latch and cascading capability, designed for reliable digital logic applications.
Product Overview
The MM74HC595MX is a high-speed 8-bit serial-in parallel-out (SIPO) shift register with an output latch, manufactured using advanced silicon-gate CMOS technology. It offers high noise immunity, low power consumption, and the ability to drive up to 15 LS-TTL loads.
The device integrates two key stages:
- An 8-bit shift register (serial input, serial/parallel output)
- An 8-bit D-type storage register with 3-state outputs (Q0-Q7)
Separate positive-edge-triggered clocks are provided for the shift register (SH_CP) and the storage register (ST_CP). A direct asynchronous clear (MR) resets the shift register, while a serial output (Q7') enables cascading multiple devices for expanded bit width.
Key Features
- 8-bit serial-in, parallel-out with storage latch
- Wide supply voltage: 2V to 6V
- Low power consumption: Quiescent current ≤ 80 µA; input current ≤ 1 µA
- High speed operation: Shift frequency up to 30 MHz (DC-30 MHz)
- 3-state parallel outputs (Q0-Q7) for bus interfacing
- Cascadable via serial output (Q7')
- Direct clear (MR) for shift register reset
- ESD-protected inputs
- Package: SOIC-16 (MM74HC595MX)
Typical Applications
- I/O Expansion for Microcontrollers: Expand limited GPIO pins (e.g., Arduino, 51 MCU) to 8+ outputs using only 3 control pins (DS, SH_CP, ST_CP). Cascading enables 16/24/32+ outputs with the same 3 MCU pins.
- LED & Numeric Display Drivers: Drive LED arrays, 7-segment displays, and dot-matrix panels by converting serial data to parallel drive signals.
- Data Serialization/Deserialization: Convert parallel data to serial for transmission, or serial data to parallel for processing in communication systems.
- General Digital Logic: Used in state machines, data storage, and timing control circuits requiring serial-to-parallel conversion.
- Industrial Control: Control relays, valves, and actuators via isolated parallel outputs in automation systems.
The 74HC logic family is compatible with standard 74LS devices in speed, function, and pinout. All inputs are protected by internal diode clamps against electrostatic discharge (ESD).
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