Note: All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a "controlled document". Current revisions, if any, to these
specifications are maintained at the factory and are available upon your request. We recommend checking the revision level before finalization of your design documentation.
2001 Elantec Semiconductor, Inc.
E
L
5
2
8
1
C
General Description
The EL5281C comparator is designed for operation in single supply
and dual supply applications with 5V to 12V between V
S
+ and V
S
-.
For single supplies, the inputs can operate from 0.1V below ground for
use in ground-sensing applications.
The output side of the comparator can be supplied from a single sup-
ply of 2.7V to 5V. The rail-to-rail output swing enables direct
connection of the comparator to both CMOS and TTL logic circuits.
The latch input of the EL5281C can be used to hold the comparator
output value by applying a low logic level to the pin. The EL5281C
features two separate comparators.
The EL5281C is available in the 14-pin SO package and is specified
for operation over the full -40C to +85C temperature range. Also
available are a single (EL5181C) and quad versions (EL5481C and
EL5482C).
Pin Configuration
1
2
3
4
14
13
12
11
5
6
7
10
9
8
EL5281C
14-Pin SO
VS+
INA+
INA-
NC
INB+
INB-
VS-
VSD
OUTA
LATCHA
NC
LATCHB
OUTB
GND
+
-
+
-
Features
8ns Typ. Propagation Delay
5V to 12V Input Supply
+2.7V to +5V Output Supply
True-to-ground Input
Rail-to-rail Outputs
Active Low Latch
Single Available (EL5181C)
Quad Available (EL5481C &
EL5482C)
Pin-compatible 4ns Family
Available (EL5x85C, EL5287C &
EL5486C)
Applications
Threshold Detection
High Speed Sampling Circuits
High Speed Triggers
Line Receivers
PWM Circuits
High Speed V/F Converters
Ordering Information
Part No.
Package
Tape & Reel
Outline #
EL5281CS
14-Pin SO
-
MDP0027
EL5281CS-T7
14-Pin SO
7"
MDP0027
EL5281CS-T13
14-Pin SO
13"
MDP0027
EL5281C
Dual 8ns High-Speed Comparator
J
u
n
e
1
4
,
2
0
0
1
2
EL5281C
Dual 8ns High-Speed Comparator
E
L
5
2
8
1
C
Absolute Maximum Ratings
(T
A
= 25C)
Absolute maximum ratings are those values beyond which the device
could be permanently damaged. Absolute maximum ratings are stress
ratings only and functional device operation is not implied.
Analog Supply Voltage (V
S
+ to V
S
-)
+12.6V
Digital Supply Voltage (V
SD
to GND)
+7V
Differential Input Voltage
[(V
S
-) -0.2V] to [(V
S
+) +0.2V]
Common-mode Input Voltage
[(V
S
-) -0.2V] to [(V
S
+) +0.2V]
Latch Input Voltage
-0.2V to [(V
SD
)
+0.2V]
Storage Temperature Range
-65C to +150C
Ambient Operating Temperature
-40C to +85C
Operating Junction Temperature
125C
Power Dissipation
See Curves
Important Note:
All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all tests are at the
specified temperature and are pulsed tests, therefore: T
J
= T
C
= T
A
.
Electrical Characteristics
V
S
= 5V, V
SD
= 5V, R
L
= 2.3k
, C
L
= 15pF, T
A
= 25C, unless otherwise specified.
Parameter
Description
Condition
Min
Typ
Max
Unit
Input
V
OS
Input Offset Voltage
V
CM
= 0V, V
O
= 2.5V
1
4
mV
I
B
Input Bias Current
-6
-3.5
A
C
IN
Input Capacitance
5
pF
I
OS
Input Offset Current
V
CM
= 0V, V
O
= 2.5V
-2.5
0.5
2.5
A
V
CM
Input Voltage Range
(V
S
-) - 0.1
(V
S
+) - 2.25
V
CMRR
Common-mode Rejection Ratio
-5.1V < V
CM
< +2.75V
65
90
dB
Output
V
OH
Output High Voltage
V
IN
> 250mV
V
SD
- 0.6
V
SD
- 0.4
V
V
OL
Output Low Voltage
V
IN
> 250mV
GND + 0.25
GND + 0.5
V
Dynamic Performance
t
pd
+
Positive Going Delay Time
V
IN
= 1V
P-P
, V
OD
= 50mV
8
12
ns
t
pd
-
Negative Going Delay Time
V
IN
= 1V
P-P
, V
OD
= 50mV
8
12
ns
Supply
I
S
+
Positive Analog Supply Current
7
8.2
mA
I
S
-
Negative Analog Supply Current
5
6.5
mA
I
SD
Digital Supply Current
Output high
4
5
mA
Output low
0.75
1
mA
PSRR
Power Supply Rejection Ratio
60
80
dB
Latch
V
LH
Latch Input Voltage High
2.0
V
V
LL
Latch Input Voltage Low
0.8
V
I
LH
Latch Input Current High
V
LH
= 3.0V
-30
-18
A
I
LL
Latch Input Current Low
V
LL
= 0.3V
-30
-24
A
t
d
+
Latch Disable to High Delay
6
ns
t
d
-
Latch Disable to Low Delay
6
ns
t
s
Minimum Setup Time
2
ns
t
h
Minimum Hold Time
1
ns
t
pw
(D)
Minimum Latch Disable Pulse Width
10
ns
3
EL5281C
Dual 8ns High-Speed Comparator
E
L
5
2
8
1
C
Typical Performance Curves
Positive Supply Current vs Temperature
7.15
7.1
7.05
7
6.95
6.9
6.85
6.8
6.75
6.7
-50
-30
-10
10
30
50
70
90
Temperature (C)
I
S
+
(
m
A
)
Negative Supply Current vs Temperature
-4.4
-4.5
-4.6
-4.7
-4.8
-4.9
-5
-5.1
-5.2
-50
-30
-10
10
30
50
70
90
Temperature (C)
I
S
-
(
m
A
)
Input Bias Current vs Temperature
6
5
4
3
2
1
0
-50
-30
-10
10
30
50
70
90
Temperature (C)
I
B
(
A
)
Offset Voltage vs Temperature
0.7
0.6
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-50
-30
-10
10
30
50
70
90
Temperature (C)
V
O
S
(
m
V
)
0.5
Negative Supply Current vs Negative Supply
Voltage
5.5
3
5
3.5
4.5
4
0
7
1
2
3
4
5
6
V
S
- (V)
I
S
-
(
m
A
)
7
0
5
1
3
2
I
S
+
(
m
A
)
Positive Supply Current vs Supply Voltage
0
7
1
2
3
4
5
6
V
S
+ (V)
6
4
V
S
-=-5V
V
SD
=5V
V
IN
=50mV
T
A
=25C
V
S
+=5V
V
SD
=5V
V
IN
=50mV
T
A
=25C
4
EL5281C
Dual 8ns High-Speed Comparator
E
L
5
2
8
1
C
Typical Performance Curves
Propagation Delay vs Supply Voltage
10
9.5
8.5
7.5
7
6.5
6
5.5
5
9
8
4
4.5
5
5.5
6
V
S
(V)
D
e
l
a
y
T
i
m
e
(
n
s
)
T
pd
+
T
pd
-
V
SD
=V
S
+
V
IN
=1V Step
V
OD
=50mV
R
L
=2.2k
Propagation Delay vs Overdrive
10
9.5
8.5
8
7.5
7
6.5
6
9
0
0.2
0.6
1
1.2
1.6
2
V
OD
(V)
D
e
l
a
y
T
i
m
e
(
n
s
)
T
pd
+
T
pd
-
V
S
=5V
V
SD
=5V
V
IN
=3V Step
R
L
=2.2k
0.4
0.8
1.4
1.8
Propagation Delay vs Overdrive
11
10.5
9.5
9
8.5
8
7.5
7
10
0
0.5
1
2
3
V
OD
(V)
D
e
l
a
y
T
i
m
e
(
n
s
)
T
pd
+
T
pd
-
V
S
=5V
V
SD
=5V
R
L
=2.2k
V
IN
=5V Step
1.5
2.5
Propagation Delay vs Source Resistance
20
18
14
12
10
8
6
4
16
0
0.2
0.4
1
1.6
Source Resistance (k
)
D
e
l
a
y
T
i
m
e
(
n
s
)
T
pd
+
T
pd
-
0.6
1.4
1.2
0.8
V
S
=5V
V
SD
=5V
R
L
=2.2k
V
IN
=1V Step
V
OD
=50mV
Propagation Delay vs Overdrive
10
9.5
8.5
7.5
7
6.5
6
5.5
5
9
8
0
100
200
300
400
500
600
V
OD
(mV)
D
e
l
a
y
T
i
m
e
(
n
s
)
T
pd
+
T
pd
-
V
S
=5V
V
SD
=5V
V
IN
=1V Step
R
L
=2.2k
Propagation Delay vs Load Capacitance
12
10
9
8
7
6
11
0
20
40
60
80
100
120
C
LOAD
(pF)
D
e
l
a
y
T
i
m
e
(
n
s
)
T
pd
+
T
pd
-
V
S
=5V
V
SD
=5V
R
L
=2.2k
V
IN
=1V Step
V
OD
=50mV
5
EL5281C
Dual 8ns High-Speed Comparator
E
L
5
2
8
1
C
Typical Performance Curves
0
10
2
4
6
Load Current (mA)
Output Low Voltage vs Load Current
0.31
0.15
0.27
O
u
t
p
u
t
L
o
w
V
o
l
t
a
g
e
(
V
)
8
0.23
0.19
V
S
=5V
V
SD
=5V
V
IN
=-50mV
0
10
2
4
6
Load Current (mA)
8
Output High Voltage vs Load Current
4.75
4.3
4.7
O
u
t
p
u
t
H
i
g
h
V
o
l
t
a
g
e
(
V
)
4.65
4.6
4.55
4.5
4.45
4.4
4.35
V
S
=5V
V
SD
=5V
V
IN
=50mV
Package Power Dissipation vs Ambient Temp.
JEDEC JESD51-3 Low Effective Thermal Conductivity Test Board
0.9
0
0.6
0.3
0.2
0.1
P
o
w
e
r
D
i
s
s
i
p
a
t
i
o
n
(
W
)
0.8
0.4
0
100
75
50
25
Ambient Temperature (C)
125
2V
V
IN
=1V
P-P
F
IN
=30MHz
1V
20ns
V
S
=5V
V
SD
=5V
Output with 30MHz Input
V
IN
=1V
P-P
2V
2V
20ns
V
IN
=3V
P-P
F
IN
=30MHz
V
S
=5V
V
SD
=5V
Output with 30MHz Input
V
IN
=3V
P-P
V
O
V
IN
V
O
V
IN
0.5
0.7
85
833mW
SO
14
120
C/W
T
A
=-40C
T
A
=85C
T
A
=25C
T
A
=-40C
T
A
=85C
T
A
=25C
Digital Supply Current vs Input Switching
Frequency
30
0
25
15
10
5
I
S
D
(
m
A
)
20
0
45
35
25
15
5
Frequency (MHz)
50
40
30
20
10
V
SD
=5V
V
SD
=3V
VS=5V
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