Datasheet

SN75ALS1177, SN75ALS1178
DUAL DIFFERENTIAL DRIVERS AND RECEIVERS
SLLS154B – MARCH 1993 – REVISED FEBRUARY 2001
8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
Figure 1. Driver Test Circuit, V
OD
and V
OC
V
OC
V
OD2
R
L
2
R
L
2
Figure 2. Receiver Test Circuit, V
OH
and V
OL
V
OL
V
OH
I
OH
I
OL
V
ID
DRIVER VOLTAGE WAVEFORMS
DRIVER TEST CIRCUIT
50 Ω
Y Output
Driver
Input
t
PHL
t
PLH
t
sk
t
sk
0 V
3 V
3 V
Generator
(see Note B)
C
L1
= 100 pF
(see Note A)
60 Ω
C
L2
= 100 pF
(see Note A)
1/2 V
O
1/2 V
O
V
O
Z Output
NOTES: A. C
L
includes probe and jig capacitance.
B. The pulse generator has the following characteristics: PRR ≤ 1 MHz, 50% duty cycle, t
r
≤ 10 ns, t
f
≤ 10 ns.
1.5 V 1.5 V
Figure 3. Driver Propagation Delay Times
Output
0 V
V
OH
t
PHZ
t
PZH
C
L
(see Note A)
Output
R
L
= 500 Ω
S1
DRIVER VOLTAGE WAVEFORMSDRIVER TEST CIRCUIT
50 Ω
Input
0 V
3 V
3 V or 0 V
0.5 V
Generator
(see Note B)
NOTES: A. C
L
includes probe and jig capacitance.
B. The pulse generator has the following characteristics: PRR ≤ 1 MHz, 50% duty cycle, t
r
≤ 10 ns, t
f
≤ 10 ns.
1.5 V 1.5 V
2.3 V
Figure 4. Driver Enable and Disable Times