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16-bit expanders offer cost-effective approach to increasing I/O capabilities

Posted: 04 Jul 2005 ?? ?Print Version ?Bookmark and Share

Keywords:microchip technology? i/o expander? micro controller? mcu? mcp23017?

To help designers save development time and cost, Microchip Technology Inc. has designed a pair of 16-bit I/O expanders to provide system I/O expansion through existing micro controller (MCU) serial ports.

The MCP23017 and MCP23S17 are designed with hardware-address pins that allow multiple devices to be cascaded in one system. That allows designers to add up to 128-bits of I/O to existing systems without having to redesign it with a higher I/O MCU.

The MCP23017 and MCP23S17 can support a broad range of applications with low and high-bandwidth requirements. The MCP23017 is the only 16-bit I/O expander that supports standard (100kHz), fast (400kHz) and high-speed (up to 1.7MHz) I2C communications, according to the company.

The MCP23S17 features SPI (serial peripheral interface) clock speeds up to 10MHz for higher throughput applications.

Both I/O expanders operate down to 1.8V and have a standby mode in which current consumption is less than 2?A. Separate interrupt outputs for each bank of 8 I/O ports can be used for system partitioning. Pins can drive standard LEDs directly (25-milliamps sink/source capability per I/O).

The MCP23017 and MCP23S17 complement the 8-bit MCP23008 and MCP23S08 I/O expanders.

Samples and volume production are available today. Packaging is lead-free and includes 28-pin PDIP, SOIC, SSOP and 6-by-6 millimeter QFN options. In 1,000-unit quantities and 28-pin PDIP packaging, the MCP23017 and MCP23S17 are priced at 86 cents and 91 cents, respectively.

- Ismini Scouras


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