Datasheet

SN75ALS1177, SN75ALS1178
DUAL DIFFERENTIAL DRIVERS AND RECEIVERS
SLLS154B – MARCH 1993 – REVISED FEBRUARY 2001
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
DRIVER SECTION
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 3.3 V
V
OL
Low-level output voltage V
IH
= 2 V, V
IL
= 0.8 V, I
OL
= 33 mA 1.1 V
|V
OD1
| Differential output voltage I
O
= 0 1.5 6 V
|V
OD2
| Differential output volta
g
e
V
CC
= 5 V, R
L
= 100 Ω, See Figure 1
1/2 V
OD1
or 2
‡
V
OD2
g
R
L
= 54 Ω, See Figure 1 1.5 2.5 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)
R
L
= 54 Ω or 100 Ω, See Figure 1 ±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)
R
L
= 54 Ω or 100 Ω, See Figure 1 ±0.2 V
I
O(OFF)
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 100 µA
I
IL
Low-level input current V
IL
= 0.4 V –100 µA
V
O
= –7 V –250
I
OS
Short circuit out
p
ut current
V
O
= V
CC
250
mA
I
OS
Short
-
circuit
output
current
V
O
= 12 V 250
mA
V
O
= 0 V 150
I
CC
Su
pp
ly current (total
p
ackage)
No load
Outputs enabled 35 50
mA
I
CC
Supply
current
(total
package)
No
load
Outputs disabled 20 50
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.
switching characteristics at V
CC
= 5 V, T
A
= 25°C (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
t
PLH
Propagation delay time, high- to low-level output
R
L
= 60 Ω, C
L1
= C
L2
= 100 pF,
See Figure 3
9 15 22 ns
t
PHL
Propagation delay time, low- to high-level output
R
L
= 60 Ω, C
L1
= C
L2
= 100 pF,
See Figure 3
9 15 22 ns
t
sk
Output-to-output skew
R
L
= 60 Ω, C
L1
= C
L2
= 100 pF,
See Figure 3
0 2 8 ns
t
PZH
Output enable time to high level C
L
= 100 pF, See Figure 4 30 35 50 ns
t
PZL
Output enable time to low level C
L
= 100 pF, See Figure 5 5 15 25 ns
t
PHZ
Output disable time from high level C
L
= 15 pF, See Figure 4 7 15 30 ns
t
PLZ
Output disable time from low level C
L
= 15 pF, See Figure 5 7 15 30 ns