Datasheet

SN75177B, SN75178B
DIFFERENTIAL BUS REPEATERS
SLLS002C – D2606, JULY 1985 – REVISED FEBRUARY 1993
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
2–7
PARAMETER MEASUREMENT INFORMATION
1.3 V
1.5 V
VOLTAGE WAVEFORMS
1.3 V
0 V
3 V
V
OL
V
OH
t
PHL
t
PLH
1.5 V
Output
Input
TEST CIRCUIT
(see Note B)
C
L
= 15 pF
Output
1.5 V
50 Ω
Generator
(see Note A)
Figure 6. Receiver Propagation Delay Times
V
OH
0.5 V
≈ 1.3 V
t
PHZ
1.5 V
0 V
3 V
S1 to 1.5 V
S2 Closed
S3 Closed
t
PLZ
≈ 1.3 V
V
OL
0.5 V
1.5 V
0 V
S1 to –1.5 V
S2 Closed
S3 Closed
3 V
≈ 4.5 V
V
OL
1.5 V
0 V
1.5 V
3 V
t
PZL
0 V
1.5 V
V
OH
0 V
Output
Input
t
PZH
S1 to 1.5 V
S2 Open
S3 Closed
1.5 V
3 V
TEST CIRCUIT
(see Note B)
C
L
= 15 pF
50 Ω
S3
5 V
S2
2 kΩ
5 kΩ
S1
–1.5 V
1.5 V
VOLTAGE WAVEFORMS
(see Note C)
Output
Output
Input
Output
Input
Output
Input
(SN75178B)
(SN75177B)
(SN75178B)
(SN75177B)
(SN75178B)
(SN75177B)
(SN75178B)
(SN75177B)
S1 to –1.5 V
S2 Closed
S3 Open
Generator
(see Note A)
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, t
r
≤ 6 ns, t
f
≤ 6 ns,
Z
O
= 50 Ω.
B. C
L
includes probe and jig capacitance.
C. All diodes are 1N916 or equivalent.