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8-channel digital output switch touts space, power savings

Posted: 13 May 2015 ?? ?Print Version ?Bookmark and Share

Keywords:Maxim Integrated Products? switch? cyclic redundancy checking?

Maxim Integrated Products Inc. has introduced a digital output switch geared to address the need for higher throughput, smaller footprint and lower power in industrial automation. This eight-channel MAX14900E claims to offer up to 70x faster speed, use over 20 per cent less power and occupy 40 per cent less space than existing solutions, stated the company.

The IC is controlled by an 8bit parallel interface, or via a standard serial peripheral interface (SPI) that is also used for configuration and monitoring. Multiple devices can be daisy-chained to support additional I/O points via the single SPI interface, requiring only three isolators for all channels to provide further savings in cost, board space and power. The serial mode includes cyclic redundancy checking (CRC) for assured data integrity, as well as global and per-channel diagnostics for remote system monitoring.


The eight digital channels require just 3mA (maximum) of supply current and operates from a supply range of 10V to 36V, thus compatible with the 24V rail of many factory systems. With an input-to-output propagation delay of 0.3?s (typical)/0.8?s (maximum), it can support fast switching rates of up to 100kHz in push pull configuration. On-resistance, a critical factor in static power dissipation is just 85m (typical) and 165m (maximum). It can drive current loads up to 850mA and outputs can be used in parallel to achieve even higher drive-current rating.

Maxim offers both a complete reference design (MAXREFDES63#) as well as an evaluation (EV) kit with special prototyping features. The credit-card-sized reference design integrates the MAX14900E, an MCU, isolated I/O port, power supplies, UART and USB port to simplify incorporating the device into the final OEM product design, as well as provide a means for quick evaluation.

MAX14900E block diagram

The MAX14900E is specified over the -40C to 125C temperature range. It is housed in a tiny, 48-pin 7mm x 7mm QFN package.

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