MCP23S17-E/SO

I/o Expanders Overview

The MCP23S17-E/SO is a 16-bit serial interface I/O expander manufactured by Microchip Technology, housed in a 28-pin Wide SOIC package. It utilizes an SPI interface with a maximum clock frequency of 10 MHz. The device operates within a supply voltage range of 1.8 V to 5.5 V and supports an operating temperature range from -40°C to +125°C. It features 16 bidirectional I/O pins (GPA0-GPA7, GPB0-GPB7), configurable interrupt outputs (INTA, INTB), and three hardware address pins (A0-A2) allowing up to eight devices on the bus. Key electrical characteristics include a maximum output current of 25 mA per pin, standby current of 1 µA (max), and ESD protection of 4 kV.

I/o Expanders Feature Summary

• Supports high-speed SPI communication with a maximum clock frequency of 10 MHz.
• Provides 16-bit remote bidirectional I/O expansion via two 8-bit ports (PORTA and PORTB).
• Features configurable interrupt output pins that can be set as active-high, active-low, or open-drain.
• Includes three hardware address pins to allow up to eight devices on the same SPI bus.

I/o Expanders Applications

• Embedded systems requiring GPIO expansion for resource-constrained microcontrollers.
• Industrial control applications utilizing AEC-Q100 qualified components.
• Systems needing isolated digital input/output monitoring with interrupt capabilities.

I/o Expanders Procurement Notes

Verify the specific suffix 'SO' corresponds to the 28-pin Wide SOIC package when ordering. Confirm the '-E' designation indicates the extended industrial temperature range (-40°C to +125°C). Ensure the SPI interface requirement aligns with the host controller's available peripherals, as this variant does not support I2C. Check for RoHS compliance status if required by your manufacturing standards.

I/o Expanders Selection Notes

Select the MCP23S17-E/SO when SPI connectivity is preferred over I2C for higher speed or simpler protocol implementation. Choose this part over the MCP23017 series if the application requires SPI rather than I2C. The '-E' suffix is necessary for operations outside the commercial temperature range. Ensure the host system can handle the 10 MHz SPI clock speed and provides the necessary chip select lines for addressing multiple devices.

I/o Expanders Part Context

This component belongs to the MCP23X17 family, which includes both I2C (MCP23017) and SPI (MCP23S17) variants. The MCP23S17-E/SO specifically denotes the SPI interface version in a 28-pin Wide SOIC package with extended temperature rating. It shares register compatibility with the I2C counterpart but differs in physical interface and addressing mechanisms.

I/o Expanders Replacement Considerations

The MCP23S17-E/SS (SSOP-28) and MCP23S17-E/ML (QFN-28) are pin-compatible alternatives within the same package family. For I2C interface replacement, consider the MCP23017-E/SO, noting the interface difference. Verify that any substitute maintains the 10 MHz SPI speed and 25 mA output drive capability.