Datasheet

SN751177, SN751178
DUAL DIFFERENTIAL DRIVERS AND RECEIVERS
SLLS059D – FEBRUARY 1990 – REVISED MAY 1999
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
DRIVER SECTIONS
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN
TYP
†
MAX UNIT
V
IK
Input clamp voltage I
I
= –18 mA –1.5 V
V
OH
High-level output voltage V
IH
= 2 V, V
IL
= 0.8 V, I
OH
= –33 mA 3.7 V
V
OL
Low-level output voltage V
IH
= 2 V, V
IL
= 0.8 V, I
OH
= 33 mA 1.1 V
|V
OD1
| Differential output voltage I
O
= 0 1.5 6 V
R
L
= 100 Ω
See Figure 1
2 or
|V
OD2
| Differential output voltage
R
L
=
100
Ω
,
See
Fig
u
re
1
1/2 V
OD1
‡
V
OD2
g
R
L
= 54 Ω, See Figure 1 1.5 5
V
OD3
Differential output voltage See Note 4 1.5 5 V
∆|V
OD
|
Change in magnitude of
differential output voltage (see Note 5)
±0.2 V
V
OC
Common-mode output voltage
R
L
= 54 Ω or 100 Ω, See Figure 1
–1
§
3 V
∆|V
OC
|
Change in magnitude of
common-mode output voltage (see Note 5)
±0.2 V
I
O
Output current with power off V
CC
= 0, V
O
= –7 V to 12 V ±100 µA
I
OZ
High-impedance-state output current V
O
= –7 V to 12 V ±100 µA
I
IH
High-level input current V
IH
= 2.7 V 20 µA
I
IL
Low-level input current V
IL
= 0.4 V –100 µA
V
O
= –7 V –250
I
OS
Short-circuit output current (see Note 6)
V
O
= V
CC
250
mA
V
O
= 12 V 250
I
CC
Su
pp
ly current
No load
Outputs enabled 80 110
mA
I
CC
S
u
ppl
y
c
u
rrent
No
load
Outputs disabled 50 80
mA
†
All typical values are at V
CC
= 5 V and T
A
= 25°C.
‡
The minimum V
OD2
with a 100-Ω load is either 1/2 V
OD1
or 2 V, whichever is greater.
§
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: 4. See TIA/EIA-485-A Figure 3.5, Test Termination Measurement 2
5. ∆|V
OD
| and ∆|V
OC
| are the changes in magnitude of V
OD
and V
OC
, respectively, that occur when the input is changed from a high
level to a low level.
6. Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second.
switching characteristics at V
CC
= 5 V, C
L
= 50 pF, T
A
= 25°C
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
t
d(OD)
Differential output delay time
R
L
=54Ω
See Figure 3
20 25 ns
t
t(OD)
Differential output transition time
R
L
=
54
Ω
,
See
Fig
u
re
3
27 35 ns
t
PLH
Propagation delay time, low- to high-level output
R
L
=27Ω
See Figure 4
20 25 ns
t
PHL
Propagation delay time, high- to low-level output
R
L
=
27
Ω
,
See
Fig
u
re
4
20 25 ns
t
PZH
Output enable time to high level R
L
= 110 Ω, See Figure 5 80 120 ns
t
PZL
Output enable time to low level R
L
= 110 Ω, See Figure 6 40 60 ns
t
PHZ
Output disable time from high level R
L
= 110 Ω, See Figure 5 90 120 ns
t
PLZ
Output disable time from low level R
L
= 110 Ω, See Figure 6 30 45 ns