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MCP23S08-E/P

MCHPMCP23S08-E/P

Microchip Technology
I/O Expander 8 SPI 10 MHz 18-PDIP
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Overview

The MCP23S08-E/P is an 8-bit I/O expander that communicates over a high-speed 10 MHz SPI interface. It allows microcontrollers to add bidirectional general-purpose I/O pins using only a few control lines, supporting supply voltages from 1.8V to 5.5V. This variant comes in a 18-PDIP package, making it ideal for through-hole prototyping and legacy system integration.

Why Choose This Part

This device features a configurable interrupt output that can signal the host MCU on pin changes, reducing the need for continuous polling. Each I/O pin supports up to 25mA source/sink current, and the AEC-Q100 qualification ensures reliability in demanding automotive and industrial temperature ranges from -40C to 125C.

Applications

User Interface Expansion
Driving LEDs and monitoring pushbuttons or keypad matrices to offload I/O tasks from the primary MCU.
Industrial Control Logic
Interfacing with sensors and actuators in 5V industrial environments while utilizing the interrupt-on-change feature for real-time response.
System Level Level-Shifting
Bridging low-voltage microcontrollers (1.8V) to higher voltage peripherals (5.5V) across the shared SPI bus.

Key Specifications

Features POR
Interface SPI
Output Type Push-Pull
Mounting Type Through Hole
Number of I/O 8
Package / Case 18-DIP (0.300", 7.62mm)
Clock Frequency 10 MHz
Interrupt Output Yes
Voltage - Supply 1.8V ~ 5.5V
Operating Temperature -40degC ~ 125degC
Supplier Device Package 18-PDIP
Current - Output Source/Sink 25mA

Getting Started

For rapid prototyping, the 18-PDIP package fits directly into standard breadboards or sockets. Developers can use Microchip's MPLAB X IDE and the XC8 compiler, or leverage widely available Arduino and Raspberry Pi SPI libraries to manage the internal registers. Ensure a 0.1uF decoupling capacitor is placed close to the VDD pin for stable high-speed SPI operation.

Also Consider

MCP23008-E/P MCHPMicrochip Technology - An identical 8-bit I/O architecture but utilizes an I2C interface instead of SPI for systems with limited chip-select lines.
MCP23S17-E/SP MCHPMicrochip Technology - Provides 16 bits of bidirectional I/O in a Skinny PDIP package for applications requiring higher pin density over the same SPI bus.

Categories

Interface ICs > I/O Expanders