MC1489ADR2G

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Type:	Receiver
Protocol:	RS232
Number of Drivers/Receivers:	0/4
Duplex:	--
Receiver Hysteresis:	250mV
Data Rate:	--
Voltage - Supply:	4.5 V ~ 5.5 V
Operating Temperature:	0°C ~ 75°C
Mounting Type:	Surface Mount
Package / Case:	14-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	14-SOIC
Base Part Number:	MC1489A

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MC1489ADR2G Application Field and Working Principle

Introduction

The MC1489ADR2G is an integrated 8-bit, bi-directional line driver designed to interface data terminal equipment with data communications equipment and designed for digital logic systems. It is also designed to provide an operational link between digital and analog equipment and to provide echo suppression capability as well as positive and negative logic interfaces between these systems. This device is primarily designed for operating in digital systems when two devices of different logic polarity share a common signal conductor. It is also used to convert a negative logic signal to a positive logic signal and to convert a positive logic signal to a negative logic signal.

Application Field

The primary application of the MC1489ADR2G is in numeric processing equipment and in computer peripherals such as keyboards, printers, modems and other peripherals. It is also used in interfacing data terminal equipment such as dumb terminals and teletypewriters with data communications equipment such as computers and modems, in order to provide an operational link between two systems of different logic polarity. The device can be used in DTE-DCE communication equipment, in data route storage, and in communication equipment used in communication systems. It is also useful in digital logic systems as an interface between analog and digital systems and as a means of connecting logic operating systems of different logic polarities.

Working Principle

The MC1489ADR2G incorporates an operational amplifier and a comparator to provide an interface between logic systems of different logic polarities. It connects directly to a line and functions as a bi-directional line driver, transmitting and receiving data in either direction. The operational amplifier has a nonlinear characteristic, with an input impedance sufficiently large to operate over a wide range of voltage levels. The comparator works by comparing the input voltage to a reference voltage and then outputting a logic signal according to the comparison result. When the input voltage is greater than the reference voltage, the comparator will output a logic 1, and when the input voltage is less than the reference voltage, the comparator will output a logic 0. The MC1489ADR2G operates from a single 5V supply that provides both logic and line drive requirements. It has two power control inputs that can be used to control the supply of the device. The "DIR" input controls the direction of data flow and the "ENA" input controls the enabling of the device. Together, they can be used to provide basic four-state drive control over a single common data line.

Conclusion

The MC1489ADR2G is an 8-bit, bi-directional line driver designed to interface data terminal equipment with data communications equipment and to provide echo suppression capability as well as positive and negative logic interfaces between these systems. It is used to convert a negative logic signal to a positive logic signal and to convert a positive logic signal to a negative logic signal. Its primary application is in numeric processing equipment and in computer peripherals such as keyboards, printers, modems and other peripherals. It is also used in DTE-DCE communication equipment, in data route storage, and in communication equipment used in communication systems. The device operates from a single 5V supply and has two power control inputs that can be used to control the supply and the direction of data flow.

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