PCA9539
Overview
This 16-bit I/O expander for the two-line bidirectional bus (I2C) is designed for 2.3-V to 5.5-V VCC operation. It provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface [serial clock (SCL), serial data (SDA)].
- 1 Low Standby-Current Consumption of 1 μA Max
- I2C to Parallel Port Expander
- Open-Drain Active-Low Interrupt Output
- Active-Low Reset Input
- 5-V Tolerant I/O Ports
- Compatible With Most Microcontrollers
- 400-kHz Fast I2C Bus
- Polarity Inversion Register
- Address by Two Hardware Address Pins for Use of up to Four Devices
- Latched Outputs With High-Current Drive Capability for Directly Driving LEDs
