Texas Instruments PCA9557
The PCA9557 consists of one 8-bit configuration (input or output selection), input port, output port, and polarity inversion (active-high) registers. The data for each input or output is kept in the corresponding input or output register. The polarity of the input port register can be inverted with the polarity inversion register.| Part No. | PCA9557 |
|---|---|
| Datasheet | PCA9557 Download |
| Manufacturer |  Texas Instruments |
| Description | Remote 8-Bit I2C and SMBus Low-Power I/O Expander |
| Buy | Stock & Price |
FEATURES
●1 Low Standby Current Consumption of 1 μA Max● I2C to Parallel Port Expander
● Operating Power-Supply Voltage Range of 2.3 V to 5.5 V
● 5-V Tolerant I/O Ports
● 400-kHz Fast I2C Bus
● Three Hardware Address Pins Allow for Use of up to Eight Devices on I2C/SMBus
● Lower-Voltage Higher-Performance Migration Path for PCA9556
● Input/Output Configuration Register
● Polarity Inversion Register
● Active-Low Reset Input
● Internal Power-On Reset
● High-Impedance Open Drain on P0
● Power Up With All Channels Configured as Inputs
● No Glitch on Power Up
● Noise Filter on SCL/SDA Inputs
● Latched Outputs With High Current Drive Maximum Capability for Directly Driving LEDs
● Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
● ESD Protection Exceeds JESD 22 – 2000-V Human-Body Model (A114-A) – 200-V Machine Model (A115-A) – 1000-V Charged-Device Model (C101) 2
DESCRIPTION
This 8-bit I/O expander for the two-line bidirectional bus (I2C) is designed for 2.3-V to 5.5-V VCC operation.
