SN65ALS176, SN75ALS176, SN75ALS176A, SN75ALS176B

DIFFERENTIAL BUS TRANSCEIVERS

SLLS040H – AUGUST 1987 – REVISED JUNE 2000

9

POST OFFICE BOX 655303

PARAMETER MEASUREMENT INFORMATION

VOD3

Vtest

375

Ω

375

Ω

60

Ω

TEST CIRCUIT

VOLTAGE WAVEFORMS

3 V

0 V

≈–2.5 V

50%

10%

tt(OD)

tt(OD)

td(ODL)

(see Note C)

50%

10%

90%

90%

1.5 V

td(ODH)

(see Note C)

Output

Input

Output

3 V

50

Ω

RL = 54 Ω

≈2.5 V

Generator

(see Note B)

CL = 50 pF

(see Note A)

1.5 V

NOTES: A. CL includes probe and jig capacitance.

B. 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.

C. td(OD) = td(ODH) or td(ODL)

Figure 3. Driver Test Circuit and Voltage Waveforms

TEST CIRCUIT

VOLTAGE WAVEFORMS

1.5 V

VOH

tPHZ

tPZH

0 V

3 V

1.5 V

2.3 V

Output

Input

Output

S1

0 V or 3 V

RL = 110 Ω

50

Ω

Voff ≈ 0

Generator

(see Note B)

CL = 50 pF

(see Note A)

NOTES: A. CL includes probe and jig capacitance.

B. 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.

Figure 4. Driver Test Circuit and Voltage Waveforms