PCF8574A

用于 I2C 总线的远程 8 位 I/O 扩展器

This 8-bit input/output I/O expander for the two-line bidirectional bus I2C is designed for 2.5-V to 6-V VCC operation.

The device provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface [serial clock SCL, serial data SDA].

The device features an 8-bit quasi-bidirectional I/O port P0–P7, including latched outputs with high-current drive capability for directly driving LEDs. Each quasi-bidirectional I/O can be used as an input or output without the use of a data-direction control signal. At power on, the I/Os are high. In this mode, only a current source to VCC is active.

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Low Standby-Current Consumption of

10 µA Max

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I2C to Parallel-Port Expander

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Open-Drain Interrupt Output

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Compatible With Most Microcontrollers

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Latched Outputs With High-Current Drive

Capability for Directly Driving LEDs

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Latch-Up Performance Exceeds 100 mA Per

JESD 78, Class II