MAX202CDWRE4

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The MAX202CDWRE4 is a dual RS-232 driver/receiver designed to meet the requirements of EIA standards RS-232, RS-423, and V.28/V.29. This device is composed of two full-duplex driver / receivers connected in parallel with one common enable control input. The MAX202CDWRE4 features advanced ESD protection of ±15 kV HBM endurance on the RS-232 pins to minimize system level noise and latch-up.

The MAX202CDWRE4 is ideal for use in a wide variety of applications requiring full-duplex asynchronous communication from 5 to 12 V supplies. Some typical applications include data acquisition systems, instruments, modems, inter-process communication, printer/plotter interfaces, and many others.

Working Principle

The MAX202CDWRE4 features two full-duplex RS-232 driver/receiver sections operating independently. Each section provides the interface between an RS-232 port and an asynchronous data communication bus. The function of the transmitter is to convert digital data from the bus into serial data suitable for transmission on the RS-232 line. The function of the receiver is to convert the incoming serial data from the RS-232 line back into digital data suitable for the bus.

The MAX202CDWRE4 features a driver enable/disable control on pin 1 (DE2). When pin 1 is LOW, both transmitters are disabled, and the output of each receiver is in its high impedance state. When pin 1 is HIGH, both transmitters are enabled. The DE2 can also be used to isolate one section from the other.

Power Supply Requirements

The MAX202CDWRE4 operates from a 5-V to 12-V supply, depending on the V/I characteristics of the driver, receiver, and supply voltage. The supply current is typically 30 mA, and the device will operate from single- or split-supply operation. The MAX202CDWRE4 is functionally identical to the MAX202 but is specified to operate from the 5 V supply voltage.

Inputs and Outputs

The MAX202CDWRE4 features two full-duplex data ports, each consisting of two drivers (A, B) and two receivers (X, Y). The drivers output TTL/CMOS compatible logic levels. The receivers accept RS-232 compatible input levels, with a hysteresis of 250 mV. The drivers are capable of driving up to 3000 pF of capacitive load with a 1-V output voltage swing. The receivers are TTL and CMOS compatible and will accept valid logic level input signals from 0 to 5 V.

Other features include onboard ESD immunity of ±15 kV to the RS-232 pins and latchup immunity of ±15 mV to the input pins. The MAX202CDWRE4 also features vector immune CMOS devices and low-glitch redundancy switching.

Conclusion

The MAX202CDWRE4 is a dual RS-232 driver/receiver designed to meet the requirements of EIA standards RS-232, RS-423, and V.28/V.29. It is ideally suited for applications requiring full-duplex asynchronous communication from 5 to 12 V supplies. The device features two full-duplex data ports consisting of two drivers (A, B) and two receivers (X, Y). The drivers are capable of driving up to 3000 pF of capacitive load and the receivers are TTL and CMOS compatible, with a hysteresis of 250 mV. Additional features of the MAX202CDWRE4 include onboard ESD immunity of ±15 kV to the RS-232 pins, latchup immunity of ±15 mV to the input pins, vector immune CMOS devices, and low-glitch redundancy switching.

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