Datasheet
SN75179B
DIFFERENTIAL DRIVER AND RECEIVER PAIR
SLLS003E – OCTOBER 1985 – REVISED JUNE 1998
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
RECEIVER SECTION
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
= 8 mA –0.2
‡
V
V
hys
Hysteresis voltage (V
IT+
– V
IT–
) 50 mV
V
OH
High-level output voltage V
ID
= 200 mV, I
OH
= –400 µA, See Figure 2 2.7 V
V
OL
Low-level output voltage V
ID
= –200 mV, I
OL
= 8 mA, See Figure 2 0.45 V
I
I
Line in
p
ut current
Other in
p
ut at 0 V
See Note 5
V
I
= 12 V 1
mA
I
I
Line
inp
u
t
c
u
rrent
Other
inp
u
t
at
0
V
,
See
Note
5
V
I
= –7 V –0.8
mA
r
i
Input resistance 12 kΩ
I
OS
Short-circuit output current –15 –85 mA
I
CC
Supply current (total package) No load 57 70 mA
†
All typical values are at V
CC
= 5 V, T
A
= 25°C.
‡
The algebraic convention, where the less positive (more negative) limit is designated minimum, is used in this data sheet for common-mode input
voltage and threshold voltage levels only.
NOTE 5: Refer to TIA/EIA-422-B for exact conditions.
switching characteristics, V
CC
= 5 V, T
A
= 25°C
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
t
PLH
Propagation delay time, low- to high-level output
V
ID
= –1.5 V to 1.5 V,
19 35 ns
t
PHL
Propagation delay time, high- to low-level output
ID
C
L
= 15 pF, See Figure 4
30 40 ns
PARAMETER MEASUREMENT INFORMATION
V
OD2
R
L
2
V
OC
R
L
2
Figure 1. Driver V
DD
and V
OC
V
ID
–I
OH
V
OH
+
I
OL
V
OL
Figure 2. Receiver V
OH
and V
OL