关键词： 集成电路（IC）接口 I/O 扩展器

品牌：NXP

型号：PCA9554PW

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

? 5 V tolerant I/Os ? Polarity inversion register ? Active-LOW interrupt output

 ? Low stand-by current ? Noise filter on SCL/SDA inputs ? No glitch on power-up

 ? Internal power-on reset ? 8 I/O pins which default to 8 inputs ? 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 ? Six packages offered: DIP16, SO16, SSOP16, SSOP20, TSSOP16, and HVQFN16

DESCRIPTION The PCA9554 and PCA9554A are 16-pin CMOS devices that provide 8 bits of General Purpose parallel Input/Output (GPIO) expansion for I2C/SMBus applications and were developed to enhance the Philips family of IC I/O expanders. The improvements include higher drive capability, 5V I/O tolerance, lower supply current, individual I/O configuration, 400 kHz clock frequency, and smaller packaging. I/O expanders provide a simple solution when additional I/O is needed for ACPI power switches, sensors, pushbuttons, LEDs, fans, etc. The PCA9554/54A consist of an 8-bit Configuration register (Input or Output selection);

 The PCA9554/54A open-drain interrupt output is activated when any input state differs from its corresponding input port register state and is used to indicate to the system master that an input state has changed. The power-on reset sets the registers to their default values and initializes the device state machine. Three hardware pins (A0, A1, A2) vary the fixed I2C address and allow up to eight devices to share the same I2C/SMBus. The PCA9554A is identical to the PCA9554 except that the fixed I2C address is different allowing up to sixteen of these devices (eight of each) on the same I2C/SMBu