New Family of 8- and 16-Port I/O Expanders Offers the Flexibility of Choosing I/Os in Any Combination and Format
SUNNYVALE, CA-November 1, 2005-Maxim Integrated Products (NASDAQ: MXIM) introduces 11 new 8- and 16-port general-purpose input/output (GPIO) and LED drivers, the MAX7319-MAX7329, to its portfolio of serial-bus-controlled GPIO and LED drivers. All new devices support hot insertion and operate with a 400KHz, I2C* 2-wire serial interface. They have 0.6microamp typical standby current, 6V overvoltage protection, and operate from a wide 1.71V to 5.5V supply voltage over the -40°C to +125°C 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. This family of products is ideal for computing, communication, consumer, industrial, and medical applications.
These 11 I/O expanders have low power consumption essential for extending battery life in mobile applications such as cell phones, PDAs, mobile computers, and satellite radios. Used to provide general I/O expansion, these products 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 attractive for data-sensitive server, router, and SAN/NAS applications. The hardware interrupt output enables the user to monitor changes at the selected inputs. 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 40k 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.
The following table illustrates the list of features and product overview.
http://www.maxim-ic.com/MAX7319-29overview
Prices start at $0.98 for 8-port and $1.34 for 16-port devices (1000-up, FOB USA).
*Purchase of I2C components from Maxim Integrated Products, Inc., or one of its sublicensed Associate Companies, conveys a license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C Standard Specification defined by Philips.
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