SN65LBC171, SN75LBC171

TRIPLE DIFFERENTIAL TRANSCEIVERS

SLLS460A – NOVEMBER 2000 – REVISED FEBRUARY 2001

7

POST OFFICE BOX 655303

PARAMETER MEASUREMENT INFORMATION

VOD

75

Ω

50

Ω

Signal

Generator{

90%

Output

0 V

10%

tf

tr

Input

0 V

3 V

tPHL

1.5 V

tPLH

90%

10%

VOD(H)

VOD(L)

1.5 V

S1

0 V

5 V

375

Ω

165

Ω

165

Ω

375

Ω

S2

0 V

5 V

60 pF}

60 pF}

† PRR = 1 MHz, 50% Duty Cycle, tr < 6 ns, tf < 6 ns, Zo = 50 Ω

‡ Includes Probe and Jig Capacitance

Figure 4. Driver Switching Test Circuit and Waveforms, HVD SCSI-Loading (double terminated)

Output

2.3 V

Input

0 V

3 V

1.5 V

tPZH

0.5 V

0 V

VOH

tPHZ

S1

50

Ω

Generator}

0 V or 3 V{

Input

RL = 110 Ω

Output

CL = 50 pFw

1.5 V

† 3 V if testing A output, 0 V if testing B output

‡ PRR = 1 MHz, 50% Duty Cycle, tr < 6 ns, tf < 6 ns, Zo = 50 Ω

w Includes Probe and Jig Capacitance

A

B

Figure 5. Driver Enable/Disable Test, High Output