MCP23S08T-E/ML

I/o Expanders Overview

The MCP23S08T-E/ML is an 8-bit I/O expander with SPI interface in a 20-pin QFN package. It operates from 1.8V to 5.5V, supporting up to 10 MHz clock frequency at -40°C to +85°C. The device features configurable interrupt outputs, hardware address pins A1 and A0 for addressing up to four devices, and internal weak pull-up resistors. Standby current is 1 µA maximum. It includes registers for direction, polarity, interrupt control, and port data.

I/o Expanders Feature Summary

• Provides 8-bit remote bidirectional I/O expansion via high-speed SPI interface
• Configurable interrupt output pin supports active-high, active-low, or open-drain modes
• Hardware address pins allow multiple devices on the same bus using shared chip select
• Internal weak pull-up resistors available on all GPIO pins

I/o Expanders Applications

• Embedded systems requiring additional digital input/output ports
• Industrial control panels needing expanded I/O capabilities
• Sensor interfaces where interrupt-driven data acquisition is required

I/o Expanders Procurement Notes

Verify the 'T' suffix indicates tape-and-reel packaging when ordering. Confirm the '-E' grade meets industrial temperature requirements if operating beyond standard commercial ranges. Ensure the QFN-20 footprint matches your PCB layout constraints before finalizing procurement.

I/o Expanders Selection Notes

Select this model over the MCP23008 when SPI connectivity is preferred over I2C. Choose the T/E/ML variant for surface-mount assembly needs. Consider the MCP23S17 if 16-bit expansion is required instead of 8-bit. Verify voltage levels match your system's logic thresholds across the full operating range.

I/o Expanders Part Context

This component belongs to the MCP23X08 family of 8-bit I/O expanders. It shares functional similarities with the I2C-based MCP23008 but utilizes SPI for communication. The device complements Microchip's broader portfolio of serial interface peripherals designed for microcontroller systems.

I/o Expanders Replacement Considerations

MCP23S08-E/ML (tube packaging)

I/o Expanders FAQ

How many devices can be addressed on the SPI bus?

Up to four devices can be addressed using the two hardware address pins (A1 and A0) while sharing a single Chip Select line.

What is the default state of the I/O pins after power-on reset?

All I/O pins default to input mode after a Power-on Reset (POR).

Can the interrupt pin be configured as open-drain?

Yes, the INT pin can be configured as active-high, active-low, or open-drain via the IOCON register.