SN75177B, SN75178B
DIFFERENTIAL BUS REPEATERS
SLLS002C – D2606, JULY 1985 – REVISED FEBRUARY 1993
PARAMETER MEASUREMENT INFORMATION
3V
Generator
(see Note A)
Input
50
Ω
1.5 V
CL = 15 pF
(see Note B)
tPLH
Output
TEST CIRCUIT
VOLTAGE WAVEFORMS
1.3 V
Output
1.5 V
1.5 V
0V
tPHL
VOH
1.3 V
VOL
Figure 6. Receiver Propagation Delay Times
1.5 V
–1.5 V
S1
Output
2 kΩ
S2
5V
CL = 15 pF
(see Note B)
Generator
(see Note A)
5 kΩ
(see Note C)
50
Ω
S3
TEST CIRCUIT
Input
1.5 V
(SN75178B)
3V
S1 to 1.5 V
S2 Open
S3 Closed
0V
VOH
1.5 V
0V
tPZH
Output
(SN75177B)
Input
(SN75178B)
1.5 V
3V
S1 to 1.5 V
S2 Closed
S3 Closed
0V
tPHZ
0.5 V
VOH
Output
≈
1.3 V
VOLTAGE WAVEFORMS
Figure 7. Receiver Output Enable and Disable Times
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.
C. All diodes are 1N916 or equivalent.
POST OFFICE BOX 655303
ÁÁÁÁÁ
ÁÁÁÁÁ
ÁÁÁÁÁ
ÁÁÁÁÁ
(SN75177B)
Input
(SN75178B)
Output
ÁÁÁÁÁ
ÁÁÁÁÁ
ÁÁÁÁÁ
ÁÁÁÁ
ÁÁÁÁ
ÁÁÁÁ
ÁÁÁÁ
ÁÁÁÁ
ÁÁÁÁ
(SN75177B)
1.5 V
3V
S1 to –1.5 V
S2 Closed
S3 Open
0V
tPZL
≈
4.5 V
1.5 V
(SN75177B)
Input
(SN75178B)
VOL
3V
S1 to –1.5 V
S2 Closed
S3 Closed
0V
1.5 V
tPLZ
≈
1.3 V
Output
0.5 V
VOL
•
DALLAS, TEXAS 75265
2–7
TI [ TEXAS INSTRUMENTS ]
