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PCF8574A-PCF8574ADGVR-PCF8574ADW-PCF8574ADWR-PCF8574AN-PCF8574APW-PCF8574APWR-PCF8574ARGYR
Remote 8-bit I/O expander for I2C-bus
PCF8574A
I2C or SMBus Master
(e.g. Processor) Peripheral Devices
RESET, ENABLE,
or control inputs
INT or status
outputs
LEDs
SDA
SCL
INT
GND
VCC
Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
PCF8574ASCPS069F –JULY 2001–REVISED NOVEMBER 2015
PCF8574A Remote 8-Bit I/O Expander forI2C Bus Features Low Standby-Current Consumptionof 10 μA Max
3 DescriptionThis 8-bit input/output (I/O) expander for the two-line•I2Cto Parallel-Port Expander
bidirectional bus(I2C)is designed for 2.5-Vto 6-V• Open-Drain Interrupt Output VCC operation.• Compatible With Most Microcontrollers
The PCF8574A device provides general-purpose• Latched Outputs With High-Current Drive remote I/O expansion for most microcontrollerCapability for Directly Driving LEDs families via theI2C interface [serial clock (SCL), serial• Latch-Up Performance Exceeds 100 mA Per data (SDA)].
JESD 78, ClassII The device features an 8-bit quasi-bidirectional I/O
port (P0–P7), including latched outputs with high-
2 Applications current drive capability for directly driving LEDs. Each
quasi-bidirectional I/O can be used as an inputor• Telecom Shelters: Filter Units
output without the use ofa data-direction control• Servers signal.At power on, the I/Os are high.In this mode,• Routers (Telecom Switching Equipment) onlya current sourceto VCCis active. Personal Computers
Device Information(1)• Personal Electronics• Industrial Automation• Products with GPIO-Limited Processors
(1) Forall available packages, seethe orderable addendumat
the endofthe data sheet.
