Product category: Analogue and Mixed Signal ICs
News Release from: Maxim Integrated Products | Subject: MAX7311
Edited by the Electronicstalk Editorial Team on 07 March 2003
Port expander boosts microcontroller I/O
The MAX7311 is a general-purpose I/O expander that interfaces 16 5V-tolerant input/output ports with MPUs and MCUs through a 400kHz two-wire SMbus/I2C-compatible serial interface.
The MAX7311 is a general-purpose I/O expander that interfaces 16 5V-tolerant input/output ports with microprocessors and microcontrollers through a 400kHz two-wire, SMbus/I2C-compatible serial interface The MAX7311's INT-bar interrupt output provides a transition detect for I/Os configured as inputs
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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All 16 ports power up as inputs, but can be configured by the master as either an input or output.
Each 5V-tolerant I/O port is capable of sinking up to 43mA and has fixed logic thresholds compatible with 2.5, 3.3 and 5.5V logic levels.
The MAX7311 has input port registers, output port registers, configuration registers, bus timeout register, and polarity inversion registers.
The SMbus timeout function can be enabled to alert the master when the bus times out for lock-up-free operation.
Three address pins are four-level logic to provide 64 unique slave IDs, easily connecting many I/O expanders on the same bus and avoiding address conflicts with other system devices.
The MAX7311 operates from a 2.0 to 5.5V supply and is available in 24-pin QFN (4 x 4mm) TSSOP, SSOP and SO packages over the automotive temperature range (-40 to +125C).
The average supply current is 43uA and standby current is typically just 2.9uA.
Prices start at $2.10 (1000-up, FOB USA).
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