MAX202EEUE

Series:	--
Packaging:	Tube
Part Status:	Obsolete
Type:	Transceiver
Protocol:	RS232
Number of Drivers/Receivers:	2/2
Duplex:	Full
Receiver Hysteresis:	500mV
Data Rate:	120Kbps
Voltage - Supply:	4.5 V ~ 5.5 V
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	16-TSSOP (0.173", 4.40mm Width)
Supplier Device Package:	16-TSSOP
Base Part Number:	MAX202

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MAX202EEUE Application Field and Working Principle

Introduction

The MAX202EEUE is an extended temperature range dual RS-232 transceiver with extremely low power operation. Featuring charge pump circuits and improved C-MOS thresholds, the MAX202EEUE makes possible RS-232 connections between any two machines for applications that were previously out of reach. Its advanced design permits supply voltages from +3.0V to +5.5V on both transmit and receive outputs and with 100kbps data rates in a wide range of temperature conditions. This device is categorized into Interface - Drivers, Receivers, Transceivers.

Application Field

The MAX202EEUE is an extended temperature range dual RS-232 transceiver for applications where low power and reliability are critical. It is perfect for the needs of embedded applications such as industrial controllers, automotive electronics, and battery-powered devices. It is also well suited for applications requiring ultra-low power and low voltage operation.

Working Principle

The MAX202EEUE is a dual channel, low-power transceiver suitable for driving and receiving an asynchronous serial data stream in RS-232-compliant systems and applications. It provides full cable-park operation of up to 100 kbps data rate in a wide range of temperature conditions.The MAX202EEUE contains two sets of transceiver circuitry. Each side of the device contains a transmit differential output, and a receive differential input, with associated bias and termination resistors. The MAX202EEUE operates from a single +3V to +5.5V supply and support logic levels from -3V to +3V in each differential pair.The MAX202EEUE also contains two charge pump circuits that generate the required biasing, as well as complementary outputs from the receivers and transmitters to accommodate the relative bias requirements of the different RS-232 transceiver circuits. When driving a pair of transmitters, underlying current sources provide the required idle current direction, the output levels are frozen by making the output high impedance. This feature helps to minimize current dissipation during the quiescent state.A number of features are provided to minimize logic power dissipation, including a low-voltage logic diagnostics port and a low-power shutdown input, both of which can be used in conjunction with external logic to dramatically reduce the overall system power consumption. The MAX202EEUE has also a built-in auto transmission mode, expressed as a time-out. In this mode, a voltage-follower facilitates a direct connection with the output of a user-supplied logic instead of two discrete resistors.

Conclusion

The MAX202EEUE is an extended temperature range dual RS-232 transceiver which is designed for ultra-low power and low voltage operation. It has underling current sources which provide the required idle current direction, the output levels are frozen by making the output high impedance, The MAX202EEUE contains two charge pump circuits that generate the required biasing, as well as complementary outputs from the receivers and transmitters to accommodate the relative bias requirements of the different RS-232 transceiver circuits. It also has a low-voltage logic diagnostics port and a low-power shutdown input which can be used in conjunction with external logic to dramatically reduce the overall system power consumption.

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