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Catalyst announces new I/O expander

Posted: 29 Sep 2006     Print Version  Bookmark and Share

Keywords:Catalyst Semiconductor  I/O bus expanders  CAT9554  I/O expander  CAT9555 

Catalyst Semiconductor Inc. announced the next addition to its recently introduced I/O bus expander product line. Similar to the recently announced CAT9554, which is an 8-bit I/O expander, the new CAT9555 provides a simple and cost-effective method to enable 16bit I²C or SMBus general purpose I/O expansion for microcontrollers.

The new Catalyst I/O expanders help designers balance system performance, processor and board costs for sensor, control and LED applications in white goods, digital cameras, cell phones, PDAs, satellite radios, routers, hubs and servers.

The CAT9555 consists of two 8-bit ports, which power up as inputs and can be configured as an input or output by writing to a register. The fixed part of the I²C slave address is the same as the 8-bit CAT9554 device, allowing any combination of up to eight of these devices to be connected on the same bus. This gives designers the flexibility to control the exact number of functions their system requires, the company explained.

An internal power-on reset circuit initializes the device and sets the registers to their default values. 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 CAT9555 is available in three RoHS-compliant package options: 24-lead SOIC, 24-pin TSSOP and 24-pad 4-by-4mm TQFN. Pricing for 10,000-piece quantities is 75 cents each. Samples are already available, with

projected lead-times for production quantities currently at six to eight weeks ARO.

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