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Catalyst rolls lower power 8bit GPIO expander

Posted: 03 Jun 2008 ?? ?Print Version ?Bookmark and Share

Keywords:8bit GPIO expander? I2C? SMBus-based systems? servers?


Catalyst Semiconductor Inc. has expanded its line of bus products with the CAT9534, an 8bit GPIO expander for I?C and SMBus-based systems. The CAT9534 is pin-for-pin and functionally compatible with Catalyst's industry-standard CAT9554, but operates at 100x lower standby power, making it the perfect choice for battery-powered and green systems applications.

With a low standby mode current supply of 1?A maximum, the CAT9534 offers a simple and cost-effective solution to add I/Os for functions such as LED indicators, control buttons, fans and sensors, while reducing power consumption in a broad range of end products, including white goods, digital cameras, cellphones, PDAs, routers, hubs and servers.

The CAT9534 has eight ports, which power up as inputs and each port can be configured as an input or output by writing to a register. An internal power-on reset eliminates glitches on power-up. Each I/O port is 5V input tolerant, with a high current I/O drive sink of up to 25mA and an I/O source of up to 10mA, maximum. Additionally, each I/O port is compatible with logic thresholds of 2.5V, 3.3V and 5V.

The CAT9534 features 400kHz I?C bus compatible, 2.3-5.5V operation and 8 I/O pins that default to inputs at power-up. It has an industrial operating temperature of -40C to 85C and is housed in 16-pin SOIC, TSSOP and 16-pad 4x4 TQFN packages.

Pricing for the CAT9534 I/O bus expander is 83 cents each, in 10,000 piece quantities. Samples are available now. Projected lead-time for production quantities is currently 6 to 8 weeks ARO.

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