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CAT9954AHV4I-T2 Datasheet(PDF) 1 Page - Catalyst Semiconductor |
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CAT9954AHV4I-T2 Datasheet(HTML) 1 Page - Catalyst Semiconductor |
1 / 16 page © 2005 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice 1 CAT9554, CAT9554A 8-bit I2C and SMBus I/O Port with Interrupt Doc. No. 25088, Rev. B DESCRIPTION The CAT9554 and CAT9554A are CMOS devices that provide 8-bit parallel input/output port expansion for I2C and SMBus compatible applications. These I/O expanders provide a simple solution in applications where additional I/Os are needed: sensors, power switches, LEDs, pushbuttons, and fans. The CAT9554/9554A consist of an input port register, an output port register, a configuration register, a polarity inversion register and an I2C/SMBus-compatible serial interface. Any of the eight I/Os can be configured as an input or output by writing to the configuration register. The system master can invert the CAT9554/9554A input data by writing to the active-high polarity inversion register. The CAT9554/9554A features an active low interrupt output which indicates to the system master that an input state has changed. The device’s extended addressing capability allows up to 8 devices to share the same bus. The CAT9554A is identical to the CAT9554 except the fixed part of the I2C slave address is different. This allows up to 16 of devices (eight CAT9554 and eight CAT9554A) to be connected on the same bus. * Catalyst Semiconductor is licensed by Philips Corporation to carry the I2C Bus Protocol. BLOCK DIAGRAM FEATURES I 400kHz I2C bus compatible* I 2.3V to 5.5V operation I Low stand-by current I 5V tolerant I/Os I 8 I/O pins that default to inputs at power-up I High drive capability I Individual I/O configuration I Polarity inversion register I Active low interrupt output I Internal power-on reset I No glitch on power-up I Noise filter on SDA/SCL inputs I Cascadable up to 8 devices I Industrial temperature range I RoHS-compliant 16-lead SOIC and TSSOP, and 16-pad TQFN (4 x 4 mm) packages APPLICATIONS I White goods (dishwashers, washing machines) I Handheld devices (cell phones, PDAs, digital cameras) I Data Communications (routers, hubs and servers) 8-BIT I/O0 I/O1 I/O2 I/O3 I/O4 I/O5 I/O6 I/O7 VCC INT WRITE pulse READ pulse LP FILTER POWER-ON RESET INPUT FILTER I2C/SMBUS CONTROL A0 A1 A2 SCL SDA VCC VSS NOTE: ALL I/Os ARE SET TO INPUTS AT RESET INPUT/ OUTPUT PORTS For Ordering Information details, see page 15. |
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