Datasheet
SN75179B
DIFFERENTIAL DRIVER AND RECEIVER PAIR
SLLS003E – OCTOBER 1985 – REVISED JUNE 1998
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
DRIVER SECTION
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP
†
MAX UNIT
V
IK
Input clamp voltage I
I
= -18 mA –1.5 V
V
O
Output voltage
IO
= 0 0 6 V
V
OD1
Differential output voltage I
O
= 0 1.5 6 V
V
OD2
Differential output voltage
R
L
= 100 Ω, See Figure 1
1/2V
OD1
or 2
‡
V
OD2
g
R
L
= 54 Ω, See Figure 1 1.5 2.5 5 V
V
OD3
Differential output voltage See Note 4 1.5 5 V
∆V
OD
Change in magnitude of common-mode
output voltage
§
±0.2 V
V
OC
Common-mode output voltage R
L
= 54 Ω or 100 Ω, See Figure 1
3
–1
V
∆V
OC
Change in magnitude of common-mode
output voltage
§
±0.2 V
I
O
Output current V
CC
= 0, V
O
= –7 V to 12 V ±100 µA
I
IH
High-level input current V
I
= 2.4 V 20 µA
I
IL
Low-level input current V
I
= 0.4 V –200 µA
I
OS
Short circuit out
p
ut current
V
O
= –7 V –250
mA
I
OS
Short
-
circ
u
it
o
u
tp
u
t
c
u
rrent
V
O
= V
CC
or 12 V 250
mA
I
CC
Supply current (total package) No load 57 70 mA
†
All typical values are at V
CC
= 5 V and T
A
= 25°C.
‡
The minimum V
OD2
with 100-Ω load is either 1/2 V
OD2
or 2 V, whichever is greater.
§
∆|V
OD
| and ∆|V
OC
| are the changes in magnitude of V
OD
and V
OC
, respectively, that occur when the input changes from a high level to a low
level.
NOTE 4: See TIA/EIA-485-A, Figure 3.5, Test Termination Measurement 2.
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 3
15 22 ns
t
t(OD)
Differential output transition time
R
L
=
54
Ω
,
See
Fig
u
re
3
20 30 ns
Symbol Equivalents
DATA-SHEET PARAMETER TIA/EIA-422-B TIA/EIA-485-A
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
OD3
| 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