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

MCP23S17T-E/SS IC XPNDR 10MHZ SPI 28SSOP Microchip Technology	8,300 In Stock	1 : ¥14.61000 Cut Tape (CT) 2,100 : ¥11.08328 Tape & Reel (TR)	-	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Not Verified	16	SPI	Yes	-	Push-Pull	25mA	10 MHz	1.8V ~ 5.5V	-40°C ~ 125°C	Surface Mount	28-SSOP (0.209", 5.30mm Width)	28-SSOP
MAX7301AAX+ IC XPNDR 26MHZ SPI 36SSOP Analog Devices Inc./Maxim Integrated	50 In Stock	1 : ¥100.74000 Tube	-	Tube	Active	Not Verified	28	SPI	Yes	-	Push-Pull	4.5mA, 10mA	26 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	Surface Mount	36-BSOP (0.295", 7.50mm Width)	36-SSOP

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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.