Datasheet

SN75172
QUADRUPLE DIFFRENTIAL LINE DRIVER
SLLS038B – OCTOBER 1980 – REVISED MAY 1995
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SYMBOL EQUIVALENTS
DATA SHEET PARAMETER
EIA/TIA-422-B RS-485
V
O
V
oa,
V
ob
V
oa,
V
ob
|V
OD1
| V
o
V
o
|V
OD2
| V
t
(R
L
= 100 Ω) V
t
(R
L
= 54 Ω)
|V
OD2
|
V
t
(Test Termination)
Measurement 2)
∆|V
OD
| ||V
t
| – |V
t
|| ||V
t
| – |V
t
||
V
OC
|V
os
| |V
os
|
∆|V
OC
| |V
os
– V
os
| |V
os
– V
os
|
I
OS
|I
sa
|,|I
sb
|
I
O
|I
xa
|,|I
xb
| I
ia
,I
ib
switching characteristics, V
CC
= 5 V, T
A
= 25°C
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
t
d(OD)
Differential-output delay time
R
L
=54Ω See Figure 2
45 65 ns
t
t(OD)
Differential-output transition time
R
L
=
54
Ω
,
See
Fig
u
re
2
80 120 ns
t
PZH
Output enable time to high level R
L
= 110 Ω, See Figure 3 80 120 ns
t
PZL
Output enable time to low level R
L
= 110 Ω, See Figure 4 45 80 ns
t
PHZ
Output disable time from high level R
L
= 110 Ω, See Figure 3 78 115 ns
t
PLZ
Output disable time from low level R
L
= 110 Ω, See Figure 4 18 30 ns
PARAMETER MEASUREMENT INFORMATION
V
OC
2
R
L
2
R
L
V
OD2
Figure 1. Differential and Common-Mode Output Voltages
VOLTAGE WAVEFORMSTEST CIRCUIT
10%
50%
90%
1.5 V1.5 V
t
t(OD)
t
d(OD)
t
t(OD)
≈ 2.5 V
0 V
3 V
t
d(OD)
Output
Input
(see Note B)
C
L
= 50 pF
54 Ω
R
L
=
50 Ω
Generator
(see Note A)
3 V
3 V or 0
≈ 2.5 V
50%
Output
NOTES: A. The input pulse is supplied by a generator having the following characteristics: t
r
≤ 5 ns, t
f
≤ 5 ns, PRR ≤ 1 MHz, duty cycle = 50%,
Z
O
= 50 Ω.
B. C
L
includes probe and stray capacitance.
Figure 2. Differential-Output Test CIrcuit and Voltage Waveforms