Datasheet
SN55LBC176, SN65LBC176, SN65LBC176Q, SN75LBC176
DIFFERENTIAL BUS TRANSCEIVERS
SLLS067H − AUGUST 1990 − REVISED DECEMBER 2010
7
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 −
)
(see Figure 4)
50 mV
V
IK
Enable-input clamp voltage I
I
= − 18 mA −1.5 V
V
High level output voltage
V
ID
= 200 mV, I
O
H
= − 400
μ
A,
27
V
V
OH
High-level output voltage
V
ID
= 200 mV
,
See Figure 6
I
OH
= 400 μA
,
2.7 V
V
Low level output voltage
V
ID
= −200 mV, I
O
L
= 8 mA,
045
V
V
OL
Low-level output voltage
V
ID
= 200 mV
,
See Figure 6
I
OL
= 8 mA
,
0.45 V
I
OZ
High-impedance-state output
current
V
O
= 0.4 V to 2.4 V −20 20 μA
I
Line input current
Other input = 0 V,
V
I
= 12 V 1
mA
I
I
Line input current
Other input = 0 V
,
See Note 5
V
I
= − 7 V −0.8
mA
I
IH
High-level enable-input current V
IH
= 2.7 V −100 μA
I
IL
Low-level enable-input current V
IL
= 0.4 V −100 μA
r
I
Input resistance 12 kΩ
Receiver enabled
and driver disabled
3.9 mA
I
CC
Suppl
y
current
V
I
= 0 or V
CC
,
No load
Ri d
SN55LBC176,
SN65LBC176
025
I
CC
Supply current
No load
Receiver and
driver disabled
SN65LBC176,
SN65LBC176Q
0.25
mA
driver disabled
SN75LBC176 0.2
†
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.
NOTE 5: This applies for both power on and power off. Refer to ANSI Standard RS-485 for exact conditions.
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, C
L
= 15 pF
PARAMETER TEST CONDITIONS
SN55LBC176
SN65LBC176Q
SN65LBC176
SN75LBC176
UNIT
PARAMETER
TEST CONDITIONS
MIN MAX MIN TYP
†
MAX
UNIT
t
PLH
Propagation delay time, low- to high-level
single-ended output
V 15 V t 15 V
11 37 11 33 ns
t
PHL
Propagation delay time, high- to low-level
single-ended output
V
ID
= − 1.5 V to 1.5 V,
See Figure 7
11 37 11 33 ns
t
sk(p)
Pulse skew (| t
PLH
− t
PHL
|) 10 3 6 ns
t
PZH
Output enable time to high level
See Figure 8
35 35 ns
t
PZL
Output enable time to low level
See Figure 8
35 30 ns
t
PHZ
Output disable time from high level
See Figure 8
35 35 ns
t
PLZ
Output disable time from low level
See Figure 8
35 30 ns
†
All typical values are at V
CC
= 5 V, T
A
= 25°C.