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

PCA9535CPW,118 IC XPND 400KHZ I2C SMBUS 24TSSOP NXP USA Inc.	6,651 In Stock	1 : ¥20.91000 Cut Tape (CT) 2,500 : ¥9.56176 Tape & Reel (TR)	-	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Not Verified	16	I2C, SMBus	Yes	POR	Open Drain	10mA, 25mA	400 kHz	2.3V ~ 5.5V	-40°C ~ 85°C	Surface Mount	24-TSSOP (0.173", 4.40mm Width)	24-TSSOP
PCA9671PW,118 IC XPNDR 1MHZ I2C 24TSSOP NXP USA Inc.	5,870 In Stock	1 : ¥22.49000 Cut Tape (CT) 2,500 : ¥11.30283 Tape & Reel (TR)	-	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Not Verified	16	I2C	No	POR	Push-Pull	100µA, 25mA	1 MHz	2.3V ~ 5.5V	-40°C ~ 85°C	Surface Mount	24-TSSOP (0.173", 4.40mm Width)	24-TSSOP

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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.