Datasheet
SN751177, SN751178
DUAL DIFFERENTIAL DRIVERS AND RECEIVERS
SLLS059D – FEBRUARY 1990 – REVISED MAY 1999
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SYMBOL EQUIVALENTS
DATA-SHEET
PARAMETER
TIA/EIA-422-B TIA/EIA-485-A
|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
RECEIVER SECTIONS
electrical characteristics over recommended ranges of common-mode input voltage, supply
voltage, and operating free-air temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP
†
MAX UNIT
V
IT+
Positive-going input threshold voltage V
O
= 2.7 V, I
O
= –0.4 mA 0.2 V
V
IT–
Negative-going input threshold voltage V
O
= 0.5 V, I
O
= 16 mA
–0.2
‡
V
V
hys
Input hysteresis voltage (V
IT+
– V
IT–
) 50 mV
V
IK
Enable clamp voltage SN751177 I
I
= –18 mA –1.5 V
V
OH
High-level output voltage V
ID
= 200 mV, I
OH
= –400 µA 2.7 V
V
OL
Low level out
p
ut voltage
V
ID
= 200 mV
I
OL
= 8 mA 0.45
V
V
OL
Lo
w-
le
v
el
o
u
tp
u
t
v
oltage
V
ID
= –
200
mV
I
OL
= 16 mA 0.5
V
I
OZ
High-impedance-state output current SN751177 V
O
= 0.4 V to 2.4 V ±20 µA
I
I
Line in
p
ut current (see Note 7)
Other in
p
ut at 0 V
V
I
= 12 V 1
mA
I
I
Line
inp
u
t
c
u
rrent
(see
Note
7)
Other
inp
u
t
at
0
V
V
I
= –7 V –0.8
mA
I
IH
High-level enable input current SN751177 V
IH
= 2.7 V 20 µA
I
IL
Low-level enable input current SN751177 V
IL
= 0.4 V –100 µA
I
OS
Short-circuit output current (see Note 6) –15 –85 µA
I
CC
Supply current No load, Outputs enabled 80 110 mA
r
i
Input resistance 12 kΩ
†
All typical values are at V
CC
= 5 V and T
A
= 25°C.
‡
The algebraic convention, where the less positive (more negative) limit is designated as minimum, is used in this data sheet for common-mode
output and threshold voltage levels only.
NOTES: 6. Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second.
7. Refer to ANSI Standards TIA/EIA-422-B, TIA/EIA-423-A, and TIA/EIA-485-A for exact conditions.