General description
The PCA9536 is an 8-pin CMOS device that provides 4 bits of General Purpose parallel Input/Output (GPIO) expansion for I2C-bus/SMBus applications and was developed to enhance the NXP Semiconductors family of I2C-bus I/O expanders. I/O expanders provide a simple solution when additional I/O is needed for ACPI power switches, sensors, push buttons, LEDs, fans, etc.

Features and benefits
■ 4-bit I2C-bus GPIO
■ Operating power supply voltage range of 2.3 V to 5.5 V
■ 5 V tolerant I/Os
■ Polarity Inversion register
■ Low standby current
■ Noise filter on SCL/SDA inputs
■ No glitch on power-up
■ Internal power-on reset
■ 4 I/O pins which default to 4 inputs with 100 k internal pull-up resistor
■ 0 Hz 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 JEDEC Standard JESD78 which exceeds 100 mA
■ Packages offered: SO8, TSSOP8 (MSOP8), HVSON8