General description

The PCA9554 and PCA9554A are 16-pin CMOS devices that provide 8 bits of General Purpose parallel Input/Output (GPIO) expansion for I2C-bus/SMBus applications and were developed to enhance the NXP Semiconductors family of I2C-bus I/O expanders. The improvements include higher drive capability, 5 V 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, push buttons, LEDs, fans, and so on.

Features and benefits

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

■ 5 V tolerant I/Os

■ Polarity Inversion register

■ Active LOW interrupt output

■ Low standby 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 Hz to 400 kHz clock frequency

■ ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101

■ Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA

■ AEC-Q100 compliance available

■ Packages offered: SO16, SSOP16, SSOP20, TSSOP16, HVQFN16 (2 versions: 4 x 4 x 0.85 mm and 3 x 3 x 0.85 mm), and bare die

PCA9554TS,112屬于集成電路（IC） > I/O 擴展器。恩智浦半導體公司制造生產(chǎn)的PCA9554TS,112I/O 擴展器該系列器件可與微控制器、微處理器或類似器件結合使用，目的是增加可用于連接外設的信號連接數(shù)量。典型的工作概念涉及使用串行通信，只需主機設備上的幾根 I/O 線，即可讀/寫擴展器設備上的許多輸入/輸出引腳的狀態(tài)。該技術的通信速度不佳，但連通性較高，最適合快速響應不是很關鍵的應用，例如許多人機界面應用。