SN75276

FAIL-SAFE DIFFERENTIAL BUS TRANSCEIVER

SLLS212B – SEPTEMBER 1995 – REVISED APRIL 1998

3

POST OFFICE BOX 655303

schematics of inputs and outputs

Output

85

Ω

NOM

TYPICAL OF RECEIVER OUTPUT

TYPICAL OF A AND B I/O PORTS

Driver input: R(eq) = 3 kΩ NOM

Enable inputs: R(eq) = 8 kΩ NOM

R(eq) = equivalent resistor

R(eq)

VCC

EQUIVALENT OF EACH INPUT

VCC

Input

180 k

Ω

NOM

Connected

on B Port

1.1 k

Ω

NOM

3 k

Ω

NOM

18 k

Ω

NOM

Connected

on A Port

180 k

Ω

NOM

A or B

VCC

7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Voltage at any bus terminal

– 10 V to 15 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.5 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous total power dissipation

See Dissipation Rating Table

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–65

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds

260

°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: All voltage values, except differential input/output bus voltage, are with respect to network ground terminal.

DISSIPATION RATING TABLE

PACKAGE

TA ≤ 25°C

POWER RATING

DERATING FACTOR

ABOVE TA = 25°C

TA = 70°C

POWER RATING

TA = 105°C

POWER RATING

D

725 mW

5.8 mW/

°C

464 mW

261 mW

P

1100 mW

8.8 mW/

°C

704 mW

396 mW