Datasheet

SN65ALS1176
DIFFERENTIAL BUS TRANSCEIVER
SLLS295A – APRIL 1998 – REVISED DECEMBER 1999
6
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 range (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–
) 60 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
-
le
v
el
o
u
tp
u
t
v
oltage
ID
,
See Figure 6
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
Lo
w-
le
v
el
o
u
tp
u
t
v
oltage
ID
,
See Figure 6
OL
,
0
.
45
V
I
OZ
High-impedance-state output current V
O
= 0.4 V to 2.4 V ±20 µA
V
I
Line in
p
ut current
Other input = 0 V,
V
I
= 12 V 1
mA
V
I
Line
inp
u
t
c
u
rrent
,
See Note 5
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 12 20 kΩ
I
OS
Short-circuit output current V
ID
= 200 mV, V
O
= 0 –15 –85 mA
I
CC
Su
pp
ly current
No load
Outputs enabled 23 30
mA
I
CC
S
u
ppl
y
c
u
rrent
No
load
Outputs disabled 19 26
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 5: This applies for both power on and power off. Refer to TIA/EIA-485-A for exact conditions.
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature range
PARAMETER TEST CONDITIONS MIN TYP
†
MAX UNIT
t
pd
Propagation time
V
ID
= –1.5 V to 1.5 V, C
L
= 15 pF,
25 ns
t
sk(p)
Pulse skew
§
ID
,
See Figure 7
L
,
0 2 ns
t
PZH
Output enable time to high level 11 18 ns
t
PZL
Output enable time to low level
C
L
=15
p
F
See Figure 8
11 18 ns
t
PHZ
Output disable time from high level
C
L
=
15
pF
,
See
Fig
u
re
8
50 ns
t
PLZ
Output disable time from low level 30 ns
†
All typical values are at V
CC
= 5 V, T
A
= 25°C.
§
Pulse skew is defined as the |t
PLH
– t
PHL
| of each channel of the same device.