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MITSUBISHI

〈DIGITAL ASSP〉

M75176P, M75177P

M75178P, M75179P

RS-485 TRANSCEIVER

MITSUBISHI

〈DIGITAL ASSP〉

M75176P, M75177P

M75178P, M75179P

RS-485 TRANSCEIVER

DESCRIPTION

Each of the M75176 to M75179 is a semiconductor IC with a

built-in differential driver and a built-in differential receiver

both of which meet the EIA standards RS-422A and RS-485.

FEATURES

Common

• 5V single power supply

• With output control input (except M75179P)

Driver

•54

Ω terminal resistor connectable between outputs.

• High output impedance at power-OFF time

• Built-in output current limit circuit

Receiver

• High input sensitivity (

±200mV max.)

• Hysteresis input (50mV typ.)

• High input impedance (12k

Ω min.)

• “H” emitted when input is open (failsafe function)

APPLICATION

High-speed data transmission interface for digital equipment

DESCRIPTION OF FUNCTION

The M75176P to M75179P are line interface ICs which meet

EIA standards RS-422A and RS-485, and are suitable for

long-distance, high-speed data transmission.

The M75176P is designed to connect the driver circuit output

and the receiver input to each other internally, and serves as

a line transceiver. The M75177P/M75178P is designed to

connect the receiver circuit output and the driver circuit input

internally, and serves as a line repeater. The M75177P and

M75178P enter the output enabled state with active “H” and

active “L”, respectively. The M75179P is equipped with a

built-in differential driver and a built-in differential receiver. It

does not have an output control input pin but its output im-

pedance at the power-OFF time goes high.

PIN CONFIGURATION (TOP VIEW)

1

2

3

4

M75176P

5

6

7

8

I/O BUS

RECEIVER OUTPUT

CONTROL INPUT

RECEIVER OUTPUT

DRIVER OUTPUT

CONTROL INPUT

DRIVER INPUT

R ←

RE →

DE →

D →

↔ B

↔ A

GND

1

2

3

4

M75177P

5

6

7

8

RECEIVER INPUT

REPEATER OUTPUT

OUTPUT CONTROL INPUT

DRIVER OUTPUT

T ←

EN →

← B

← A

→ Z

→ Y

GND

1

2

3

4

M75178P

5

6

7

8

T ←

EN →

← B

← A

→ Z

→ Y

GND

RECEIVER INPUT

REPEATER OUTPUT

OUTPUT CONTROL INPUT

DRIVER OUTPUT

1

2

3

4

M75179P

5

6

7

8

RECEIVER INPUT

RECEIVER OUTPUT

DRIVER INPUT

DRIVER OUTPUT

R ←

D →

← B

← A

→ Z

→ Y

GND

Outline 8P4