Datasheet

SN75976A, SN55976A
9-CHANNEL DIFFERENTIAL TRANSCEIVER
SLLS218B – MAY 1995 – REVISED MAY 1997
13
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
†
A
620 Ω
V
T
Output
40 pF
‡
B+
B–
DE/RE
0 V or 3 V
3 V or 0 V
Input
†
CDE0 is high, CDE1, CDE2, BSR, and CRE
are low and, for
the SN75976A only, all others are open.
‡
Includes probe and jig capacitance.
Figure 7. Receiver Enable and Disable Time Test Circuit
Indeterminate
Indeterminate
t
PLZ
t
PZL
1.4 V 1.4 V
1.4 V 1.4 V
1.4 V 1.4 V
3 V
0 V
Input
Output
V
OD
Output
V
OD
B+ at 0 V
B– at 3 V
V
T
= V
CC
B+ at 3 V
B– at 0 V
V
T
= 0
t
PHZ
t
PZH
Figure 8. Receiver Enable and Disable 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.