Product Descriptions

The MAX3221 device consists of one line driver, one line receiver with dedicated enable pin, and a dual charge-pump circuit with ±15-kV ESD protection pin to pin (serial-port connection pins, including GND). The device meets the requirements of TIA/EIA-232- F and provides the electrical interface between an asynchronous communication controller and the serial-port connector. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V supply. These devices operate at data signaling rates up to 250 kbps and a maximum of 30-V/μs driver output slew rate.

Flexible control options for power management are available when the serial port is inactive. The automatic power-down feature functions when FORCEON is low and FORCEOFF is high. During this mode of operation, if the device does not sense a valid..

RS-232 signal on the receiver input, the driver output is disabled and the supply current is reduced to 1 μA. The INVALID output notifies the user if an RS-232 signal is present at the receiver input.

Product Features

• RS-232 Bus-pin ESD protection exceeds ±15 kV using human body model (HBM)

• Meets or exceeds the requirements of TIA/EIA-232-F and ITU V.28 standards

• Operates with 3-V to 5.5-V VCC supply

• Operates up to 250 kbps

• One driver and one receiver

• Low standby current: 1 μA typical

• External capacitors: 4 × 0.1 μF

• Accepts 5-V logic input with 3.3-V supply

• Alternative high-speed pin-compatible device (1 Mbps)

– SNx5C3221

• Automatic power-down feature automatically disables drivers for power savings

Product Applications

• Industrial PCs

• Wired networking

• Data center and enterprise computing

• Battery-powered systems

• PDAs

• Notebooks

• Laptops

• Palmtop PCs

• Hand-held equipment

Product Specification

Product Photos

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