Datasheet

SN65176B, SN75176B
DIFFERENTIAL BUS TRANSCEIVERS
SLLS101D – JULY 1985 – REVISED APRIL 2003
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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
|V
OD3
|
t
(
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 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
Input hysteresis voltage (V
IT+
– V
IT–
) 50 mV
V
IK
Enable Input clamp voltage I
I
= –18 mA –1.5 V
V
OH
High level out
p
ut voltage
V
ID
= 200 mV, I
OH
= –400
µ
A,
27
V
V
OH
High
-
level
output
voltage
ID
,
See Figure 2
OH
µ ,
2
.
7
V
V
OL
Low level out
p
ut voltage
V
ID
= –200 mV, I
OL
= 8 mA,
045
V
V
OL
Low
-
level
output
voltage
ID
,
See Figure 2
OL
,
0
.
45
V
I
OZ
High-impedance-state output current V
O
= 0.4 V to 2.4 V ±20 µA
I
I
Line in
p
ut current
Other input = 0 V,
V
I
= 12 V
1
mA
I
I
Line
input
current
,
See Note 7
V
I
= –7 V
–0.8
mA
I
IH
High-level enable input current V
IH
= 2.7 V 20 µA
I
IL
Low-level enable input current V
IL
= 0.4 V –100 µA
r
I
Input resistance V
I
= 12 V 12 kΩ
I
OS
Short-circuit output current –15 –85 mA
I
CC
Su
pp
ly current (total
p
ackage)
No load
Outputs enabled 42 55
mA
I
CC
Supply
current
(total
package)
No
load
Outputs disabled 26 35
mA
†
All typical values are at V
CC
= 5 V, T
A
= 25°C.
‡
The algebraic convention, in which 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 7: This applies for both power on and power off. Refer to EIA Standard TIA/EIA-485-A for exact conditions.