SN75LBC771

GEOPORT

™ TRANSCEIVER

SLLS226A – APRIL 1996 – REVISED NOVEMBER 1997

8

POST OFFICE BOX 655303

PARAMETER MEASUREMENT INFORMATION

TEST CIRCUIT

tPLH

tPHZ

tPZH

tPHL

tPLZ

tPZL

tr

tf

1.5 V

1.5 V

1.5 V

1.5 V

1.5 V

1.5 V

90%

90%

10%

90%

90%

10%

10%

10%

3 V

0 V

3 V

0 V

VOD(H)

VOD(L)

0 V

SHDN

or

DEN

DA

VOD

VOLTAGE WAVEFORM

(see Note A)

VI

VOD

DY2

DZ2

SHDN

or

DEN

DA2

RL = 60 Ω

50 pF

RL = 60 Ω

50%

50%

NOTE A: For the input waveform tr, tf < = 10 ns

Figure 5. Differential Driver Propagation and Transition Times Test Circuit and Waveforms

_

+

VI

II

IO

VO

VCC

2 k

Ω

15 pF

RY

RA

RB

Input

SHDN

Output

tr

tf

tPLH

tPHL

0 V

0 V

2.5 V

– 2.5 V

VOH

1.5 V

VOL

90%

90%

10%

10%

VI

VO

TEST CIRCUIT

VOLTAGE WAVEFORM

(see Note A)

NOTE A: For the input waveform tr, tf < = 10 ns

Figure 6. Receiver Propagation and Transition Times Test Circuit and Waveform