I/O Expanders

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Mfr Part #	Quantity Available	Price	Series	Package	Product Status	DigiKey Programmable	Number of I/O	Interface	Interrupt Output	Features	Output Type	Current - Output Source/Sink	Clock Frequency	Voltage - Supply	Operating Temperature	Mounting Type	Package / Case	Supplier Device Package

MCP23S08T-E/SO IC XPNDR 10MHZ SPI 18SOIC Microchip Technology	25,836 In Stock	1 : ¥13.09000 Cut Tape (CT) 1,100 : ¥10.52025 Tape & Reel (TR)	-	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Not Verified	8	SPI	Yes	POR	Push-Pull	25mA	10 MHz	1.8V ~ 5.5V	-40°C ~ 125°C	Surface Mount	18-SOIC (0.295", 7.50mm Width)	18-SOIC
MCP23S17-E/SO IC XPNDR 10MHZ SPI 28SOIC Microchip Technology	8,796 In Stock	1 : ¥14.37000 Tube	-	Tube	Active	Not Verified	16	SPI	Yes	POR	Push-Pull	25mA	10 MHz	1.8V ~ 5.5V	-40°C ~ 125°C	Surface Mount	28-SOIC (0.295", 7.50mm Width)	28-SOIC
MCP23S17T-E/ML IC XPNDR 10MHZ SPI 28QFN Microchip Technology	30,402 In Stock	1 : ¥17.34000 Cut Tape (CT) 1,600 : ¥13.09198 Tape & Reel (TR)	-	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Not Verified	16	SPI	Yes	POR	Push-Pull	25mA	10 MHz	1.8V ~ 5.5V	-40°C ~ 125°C	Surface Mount	28-VQFN Exposed Pad	28-QFN (6x6)

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I/O Expanders

Devices in this family are used in conjunction with microcontrollers, microprocessors, or similar devices for the purpose of increasing the number of signal connections available for connecting peripheral devices. The typical concept of operation involves the use of serial communications requiring only a few I/O lines on the host device to read/write the status of many input/output pins on the expander device. The technique exchanges speed of communication for increased connectivity, and is best suited for applications where fast response is not critical, such as in many human interface applications.