SN75276

FAIL-SAFE DIFFERENTIAL BUS TRANSCEIVER

SLLS212B – SEPTEMBER 1995 – REVISED APRIL 1998

9

POST OFFICE BOX 655303

PARAMETER MEASUREMENT INFORMATION

VOH

0.5 V

≈ 1.3 V

tPHZ

Output

Input

1.5 V

0 V

3 V

S1 to 1.5 V

S2 Closed

S3 Closed

tPLZ

≈ 1.3 V

VOL

0.5 V

Output

Input

1.5 V

0 V

3 V

≈ 4.5 V

VOL

1.5 V

S3 Open

S2 Closed

S1 to –1.5 V

0 V

1.5 V

3 V

tPZL

Output

Input

0 V

1.5 V

VOH

0 V

Output

Input

tPZH

S3 Closed

S2 Open

S1 to 1.5 V

1.5 V

3 V

TEST CIRCUIT

50

Ω

1N916 or Equivalent

S3

5 V

S2

2 k

Ω

5 k

Ω

S1

–1.5 V

1.5 V

VOLTAGE WAVEFORMS

S1 to – 1.5 V

S2 Closed

S3 Closed

Generator

(see Note A)

CL = 15 pF

(see Note B)

NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR

≤ 1 MHz, 50% duty cycle, tr ≤ 6 ns, tf ≤ 6 ns,

ZO = 50 Ω.

B. CL includes probe and jig capacitance.

Figure 7. Receiver Test Circuit and Voltage Waveforms