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	Grade	Qualification	Mounting Type	Package / Case	Supplier Device Package

PCAL6416AHF,128 IC XPND 400KHZ I2C SMBUS 24HWQFN NXP USA Inc.	157,497 In Stock	1 : ¥13.69000 Cut Tape (CT) 6,000 : ¥5.52599 Tape & Reel (TR)	Agile	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Not Verified	16	I2C, SMBus	Yes	POR	Open Drain, Push-Pull	10mA, 25mA	400 kHz	1.65V ~ 5.5V	-40°C ~ 85°C	-	-	Surface Mount	24-WFQFN Exposed Pad	24-HWQFN (4x4)
SX1509BIULTRT IC XPNDR 400KHZ I2C 28QFN Semtech Corporation	75,036 In Stock	1 : ¥29.47000 Cut Tape (CT) 3,000 : ¥14.77784 Tape & Reel (TR)	-	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Not Verified	16	I2C	Yes	Keypad Controller, LED Output, POR	Open Drain, Push-Pull	8mA, 15mA	400 kHz	1.425V ~ 3.6V	-40°C ~ 85°C	-	-	Surface Mount	28-UFQFN Exposed Pad	28-QFN-UT (4x4)

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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.