Datasheet

SN75976A, SN55976A
9-CHANNEL DIFFERENTIAL TRANSCEIVER
SLLS218B – MAY 1995 – REVISED MAY 1997
12
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
1.5 V 1.5 V
90% 90%
10%
10%
1.4 V
1.4 V
t
PLH
t
PHL
3 V
0 V
V
OH
V
OL
Input B–
Output
t
r
t
f
Input B+
Figure 4. Receiver Delay and Transition Time Waveforms
V
OD
B+
B–
A
50 pF
50 pF
†
75 Ω
165 Ω
375 Ω
375 Ω
165 Ω
4.5 V
AB
See Table 1
†
Includes probe and jig capacitance in two places.
0 V or 3 V
S1
DE/RE
Input
S2
Figure 5. Driver Enable and Disable Time Test Circuit
Table 1. Enabling For Driver Enable And Disable Time
DRIVER BSR CDE0 CDE1 CDE2 CRE
1 – 8 H H L L X
9 L H H H H
1.5 V 1.5 V
0 V
0 V
0 V
0 V
t
PZH
t
PHZ
t
PZL
t
PLZ
3 V
0 V
V
OD(H)
∼ –1 V
∼ 1 V
V
OD(L)
Input, DE/RE
Output, V
OD
Output, V
OD
A at 3V
S1 to B
A at 0V
S1 to A
Figure 6. Driver Enable Time Waveforms
NOTES: A. All input pulses are supplied by a generator having the following characteristics: t
r
≤ 6 ns, t
f
≤ 6 ns, PRR ≤ 1 MHz, duty cycle = 50%,
Z
O
= 50 Ω.
B. All resistances are in Ω and ± 5%, unless otherwise indicated.
C. All capacitances are in pF and ± 10%, unless otherwise indicated.
D. All indicated voltages are ± 10 mV.