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I/O expanders simplify MCU-based system upgrades

Posted: 21 Jan 2005 ?? ?Print Version ?Bookmark and Share

Keywords:microchip technology? input/output expander? i/o expander? mcp23008? mcp23s08?

Microchip Technology Inc. is announcing two input/output (I/O) expanders for 8bit ports. The MCP23008 supports standard (100kHz), fast (400kHz) and high-speed (up to 1.7MHz) I?C communications, while the MCP23S08 I/O expander supports SPI clock speeds up to 10MHz.

These devices are intended to ease development and cut costs for designers to upgrading their current microcontroller (MCU)-based systems with additional I/O capability. Both the MCP23008 and MCP23S08 provide system I/O expansion via existing MCU serial ports, saving development time and cost by eliminating the need to redesign the complete system with a higher I/O microcontroller. The devices can support a broad range of applications with low- and high-bandwidth requirements.

Hardware-address pins allow multiple devices to be cascaded in one system adding up to 64 bits of I/O to existing systems.

Samples and volume production are available today. Packaging includes Pb-free 18-pin PDIPs, 18-pin SOICs and 20-pin SSOPs. The MCP23008 is priced at 75 cents each in 1,000-unit quantities for the 18-pin PDIP. The MCP23S08 is priced at 80 cents each in 1,000-unit quantities for the 18-pin PDIP.


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