MCP23S17T-E/SO

I/o Expanders Overview

The MCP23S17T-E/SO is a 16-bit I/O expander with an SPI interface, housed in a 28-pin SOIC package. It operates within a supply voltage range of 1.8V to 5.5V and supports clock frequencies up to 10MHz. The device provides bidirectional I/O pins with configurable interrupt outputs (INTA/INTB) and includes three hardware address pins for bus expansion. It features low standby current of 1µA maximum and operates across extended temperature ranges from -40°C to +125°C.

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 ports divided into two 8-bit ports.
• Features configurable interrupt output pins that can be set as active-high, active-low, or open-drain.
• Includes three hardware address pins allowing up to eight devices on the same bus.

I/o Expanders Applications

• Embedded systems requiring additional digital I/O lines via SPI
• Industrial control panels with limited microcontroller pins
• Automotive electronics applications

I/o Expanders Procurement Notes

Verify the specific suffix 'E' indicates the extended temperature grade (-40°C to +125°C) and 'SO' denotes the wide SOIC package. Confirm the 'T' suffix corresponds to tape and reel packaging if required by your assembly process. Ensure the host system supports the 10MHz SPI clock speed and compatible logic levels for the selected supply voltage.

I/o Expanders Selection Notes

Select this component when an SPI interface is preferred over I2C for higher data throughput or simpler protocol implementation. It serves as the serial equivalent to the MCP23017, offering identical register mapping and functionality but utilizing four SPI wires instead of two I2C lines. Consider the 28-pin SOIC footprint constraints during PCB layout.

I/o Expanders Part Context

This part belongs to the MCP23X17 family, which also includes the I2C variant MCP23017. Both share the same internal architecture and register set, differing only in the serial communication protocol. The T-E/SO designation specifies the tape-and-reel, extended-temperature, wide-SOIC version of the standard MCP23S17.

I/o Expanders Replacement Considerations

MCP23S17-E/SS: Same electrical specifications and functionality, but packaged in SSOP-28 instead of SOIC-28. Verify pin compatibility and board space requirements before substitution.

I/o Expanders FAQ

Can the MCP23S17 operate at 1.8V?

Yes, the device supports an operating voltage range from 1.8V to 5.5V, though the maximum SPI clock frequency may vary depending on the specific voltage within this range.

How many devices can be connected on a single SPI bus?

Up to eight devices can be connected using the three hardware address pins (A0, A1, A2), provided each device has a unique address configuration.

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

Upon power-on reset, all I/O pins are configured as inputs by default, and the registers are set to their initial values.