MCP23S08-E/SS

I/o Expanders Overview

The MCP23S08-E/SS is an 8-bit I/O expander featuring a high-speed SPI interface, manufactured by Microchip Technology. It operates within a supply voltage range of 1.8V to 5.5V and supports clock frequencies up to 10 MHz. The device provides eight bidirectional general-purpose I/O pins with configurable interrupt outputs and internal pull-up resistors. It utilizes two hardware address pins (A1, A0) for addressing on the SPI bus. The component is housed in a 20-pin SSOP package and is rated for industrial temperature ranges from -40°C to +85°C or extended ranges up to +125°C depending on voltage conditions.

I/o Expanders Feature Summary

• High-speed serial peripheral interface supporting up to 10 MHz clock rates
• Configurable interrupt output pin with selectable polarity and open-drain modes
• Hardware address selection via external biasing of A1 and A0 pins
• Internal weak pull-up resistors controllable per I/O pin

I/o Expanders Applications

• Embedded systems requiring GPIO expansion via SPI
• Industrial control interfaces with interrupt-driven input monitoring
• Resource-constrained microcontroller designs needing additional digital I/O ports

I/o Expanders Procurement Notes

Verify the specific suffix 'E' indicates the extended temperature grade and 'SS' denotes the SSOP package type against the manufacturer's current datasheet revision DS20001919F. Confirm that the ordering code matches the exact pinout and electrical specifications required for the target application environment.

I/o Expanders Selection Notes

Select this component when an SPI-based I/O expander is preferred over I2C alternatives due to higher speed requirements or existing bus architecture constraints. Ensure the host controller supports the necessary SPI mode and can manage the chip select lines for multiple devices if more than four units are deployed on the same bus.

I/o Expanders Part Context

This part belongs to the MCP23X08 family of 8-bit I/O expanders. Unlike the MCP23008 which uses an I2C interface, the MCP23S08 variant specifically implements an SPI interface. The 'E' suffix typically designates the industrial/extended temperature operating range, while 'SS' identifies the shrink small-outline package style.

I/o Expanders Replacement Considerations

The MCP23S08-E/ML serves as a direct package alternative offering identical electrical and functional specifications but housed in a QFN-20 package instead of SSOP-20. Other members of the MCP23X08 family share core logic but differ in interface protocol.