PCA9555AHF,128

PCA9555AHF,128 is a low-voltage 16bit I2C-bus I/O port with interrupt and weak pull-up. This low-voltage 16-bit General Purpose Input/Output (GPIO) expander with interrupt and weak pull-up resistors for I2C-bus/SMBus applications. NXP I/O expanders provide a simple solution when additional I/Os are needed while keeping interconnections to a minimum, for example, in ACPI power switches, sensors, push buttons, LEDs, fan control, etc. In addition to providing a flexible set of GPIOs, the wide VDD range of 1.65V to 5.5V allows the PCA9555A to interface with next-generation microprocessors and microcontrollers where supply levels are dropping down to conserve power. The PCA9555A contains the PCA9555 register set of four pairs of 8-bit configuration, input, output, and polarity inversion registers. The PCA9555A is a pin-to-pin replacement to the PCA9555 and other industry-standard devices. A more fully featured device, the PCAL9555A, is available with Agile I/O features.

• I2C-bus to parallel port expander
• Open-drain active LOW interrupt output (INT)
• Schmitt-trigger action allow slow I/P transition and better switching noise immunity at SCL, SDA I/P
• 400kHz fast-mode I2C-bus, internal power-on reset
• 5V tolerant I/Os and no glitch on power-up
• Power-up with all channels configured as inputs with weak pull-up resistors
• Latched outputs with 25mA drive maximum capability for directly driving LEDs
• Latch-up performance exceeds 100mA per JESD78, Class II
• ESD protection exceeds JESD22 2000V Human Body Model (A114-A) and 1000V Charged-Device Model (C101)
• 24 pin HWQFN package, ambient temperature range from -40 to 85°C