DESCRIPTION

The PCA9557 is a silicon CMOS circuit which provides parallel input/output expansion for SMBus and I2C applications. The PCA9557 consists of an 8-bit input port register, 8-bit output port register, and an I2C/SMBus interface. It has low current consumption and a high impedance open drain output pin, I/O0. The system master can enable the PCA9557’s I/O as either input or output by writing to the configuration register.

FEATURES

? Lower voltage, higher performance migration path for the PCA9556

? 8 general purpose input/output expander/collector

? Input/output configuration register

? Active HIGH polarity inversion register

? I2C and SMBus interface logic

? Internal power-on reset

? Noise filter on SCL/SDA inputs

? Active LOW reset input

? 3 address pins allowing up to 8 devices on the I2C/SMBus

? High impedance open drain on I/O0

? No glitch on power-up

? Power-up with all channels configured as inputs

? Low standby current

? Operating power supply voltage range of 2.3 V to 5.5 V

? 5 V tolerant inputs/outputs

? 0 to 400 kHz clock frequency

? ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101

? Latch-up testing is done to JESDEC Standard JESD78 which exceeds 100 mA

? Package offer: SO 16, TSSOP 16