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New GPIO and LED drivers from Maxim

Posted: 03 Nov 2005 ?? ?Print Version ?Bookmark and Share

Keywords:maxim integrated products? general-purpose input/output? gpio? led driver? max7319?

Maxim Integrated Products expanded its portfolio of serial-bus-controlled GPIO and LED drivers with the release of eleven new 8- and 16-port general-purpose input/output (GPIO) and LED drivers, the MAX7319-MAX7329.

All new devices support hot insertion and operate with a 400KHz, I?C 2-wire serial interface. They have 0.6?A typical standby current, 6V overvoltage protection, and operate from a 1.71V to 5.5V supply voltage over the -40C to 125C automotive temperature range. These I/O expanders are feature and software compatible to each other, so any combination of the 16-port and 8-port devices can be used together for applications requiring more I/Os.

The 11 I/O expanders have low power consumption essential for extending battery life in mobile applications such as cellphones, PDAs, mobile computers and satellite radios. Used to provide general I/O expansion, these devices can drive display and keypad backlights, function and status indicators, RGB fun lights, and battery- and signal-strength indicator LEDs. The interrupt and reset functions make these parts suitable for data-sensitive server, router and SAN/NAS applications. The hardware interrupt output enables the user to monitor changes at the selected inputs, and the reset input will quickly void any bus transaction, thus forcing the device into a STOP condition.

The products are offered as input only, push-pull output only, and as various configurations of multiple I/O combinations. Outputs are either push-pull (PP) for source and sink capability and faster rise time, or open drain (OD). An external pull-up resistor lets the OD outputs level shift the logic-high to lower or higher than the supply voltage. The OD outputs can also be configured as inputs and set to selectable power-up default levels.

The input ports offer a programmable latching-transition feature with selectable 40 kilohm pull-up resistors. An interrupt mask register will enable any combination of inputs to monitor and latch unwanted events such as voltage transients, power-fail warning, or LED malfunction. Any transient will assert an interrupt output to prevent continuous processor polling. The transition flags identify which inputs have initiated the interrupt since the ports were last read.

The MAX7328 and MAX7329 are 8-port second sources to the PCF8574 and PCF8574A, respectively. The MAX7319 and MAX7320 are 8-port input and PP output only, respectively. The MAX7321 offers the flexibility that all eight I/Os can be configured as either inputs or OD outputs. The MAX7322 has four inputs and four PP outputs. The MAX7323's four I/Os can be configured as inputs or OD outputs. The MAX7323 also has four PP outputs.

The MAX7324/MAX7325/MAX7326/MAX7327 are 16-port versions of the 8-port devices. Each of these devices has at least 8 PP outputs equivalent and software-compatible to the MAX7319-MAX7323.

Prices start at 98 cents for 8-port and $1.34 for 16-port devices (1,000-up, FOB USA).

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