MAX251CPD+

MAX251CPD+ is a 5V, isolated, RS-232 driver/receiver. By combining many functions on two chips, the cost and complexity required for an isolated digital interface is greatly reduced. Four low-cost optocouplers, four capacitors, a diode and a small pot-core type transformer are all that are required to complete a 19.2k baud transceiver. Faster data rates are possible by using high-speed optocouplers. In addition to the driving and receiving circuitry for the optocouplers, the chipset includes a push-pull transformer driver to supply power to the interface's isolated side. Other convenient features include single +5V operation, a low power shutdown mode, and output-enabling control for three-state operation. Applications include bridge ground differentials, data links to analogue circuits, high-noise data communications, and industrial communications.

• Isolated data interface, single +5V supply
• Uses low cost optocouplers
• 5µW power shutdown, 2 transmitters and 2 receivers
• Positive supply current is 0.7mA typical
• Negative supply current is 0.45mA typical
• RS-232 output voltage swing is ±7.2V typ, all transmitter outputs loaded with 3kohm to ground
• Transmitter slew rate is 3V/µs min at RL=3kohm, CL=2500pF
• Output source current is -7mA typ at Vout=1.4V, TA=25°C
• 14 lead plastic DIP package
• Temperature range from 0°C to +70°C

Warnings

Market demand for this product has caused an extension in leadtimes. Delivery dates may fluctuate. Product exempt from discounts.

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party