NTE943, NTE943M, & NTE943SM
Integrated Circuit
Low Power, Low Offset, Dual Voltage Comparator
Description:
The NTE943, NTE943M, and NTE943SM consist of two independent precision voltage comparators
with an offset voltage speciication as low as 2.0mV max for two comparators which were designed
specifically to operate from a single power supply over a wid range of voltages. Operation from split
power supplies is also possible and the low power supply current drain is independent of the magni-
tude of the power supply voltage. These comparators alos have a unique characteristic in that the
input commonmode voltage range includesground, even though operated from a single powe sup-
ply voltage.
Application areas include limit comparators, simple analog to digital converters; pulse, squarewave
and time delay generators; wide range VCO; MOS clock timers; multivibrators and high voltage digital
logic gates. These devices are designed to directly interface with TTL and CMOS. When operated
from both plus and minus power supplies they will directly interface with MOS logic where their low
power drain is a distinct advantage over standard comparators.
Features:
D
Wide Single Supply
Volatge Range: 2.0V to 36V
Dual Supplies:
1.0V to
18V
D
Low Supply Current Drain (0.8mA) Independent of Supply Voltage (1.0mW/Comparator at 5V)
D
Low Input Biasing Current: 25nA
D
Low Input Offset Current:
5nA
D
Maximum Offset Voltage:
3mV
D
Input CommonMode Voltage Range Includes Ground
D
Differential Input Voltage Range Equal to the Power Supply Voltage
D
Low Output Saturation Voltage: 240mV @ 4mA
D
Output Voltge Compatible with TTL, DTL, ECL, MOS, and CMOS Logic Sytems
D
Available in 3 Different Case Styles:
8Lead Metal Can: NTE943
8Lead Mini DIP: NTE943M
8Lead SOIC (Surface Mount): NTE943SM
Absolute Maximum Ratings:
Supply Voltage, V+
36V or
18V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Differential Input Voltage (Note 1)
36V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Voltage
0.3V to +36V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Dissipation (Note 2)
NTE943
660mW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NTE943M
780mW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NTE943SM
510mW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Short Circuit to GND (Note 3)
Continuous
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Current (V
IN
< 0.3V), Note 4)
50mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature Range
0
to +70
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range
65
to +150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead Temperature (During Soldering, 10 sec)
+260
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Note 1. Positive excursions of input voltage may exceed the power supply level. As long as the other
voltage remains within the commonmode range, the comparator will provide a proper out-
put state. The low input voltage state must not be less than 0.3V (or 0.3V below the the
magnitude of the negative power supply, if used).
Note 2. For operating at elevated temperature, these devices must be derated based on a 125
C
maximum junction temperature and a thermal resistance of 127
C/W which applies for the
device soldered in a printed circuit board, operating in a still air ambient. The low bias dis-
sipation and the "ONOFF" haracteristic of the output keeps the chip dissipation very small
(P
D
100mW), provided the output transistors are allowed to saturate.
Note 3. Short circuits from the output to V+ can cause excessive heating and eventual destruction.
When considering short circuits to GND, the maximum output current is approximately 20mA
independent of the magnitude of V+.
Note 4. This input current will only exist when the voltage at any of th input leads is driven negative.
It is due to the collectorbase junction of the input PNP transistors becoming forward biased
and thereby acting as input diode clamps. In addition to this diode action, there is also lateral
NPN parasitic transistor action on the IC chip. This transistor action can cause the output
voltages of the comparators to go to the V+ voltage level (or to GND for a large overdrive)
for the time duration that an input is driven negative. This is not destructive and normal out-
put states will reestablish when the input voltage, which was negative, again returns to a
value greater than 0.3V.
Electrical Characteristics: (0
T
A
+70
C, V+ = 5V unless otherwise specified)
Parameter
Test Conditions
Min
Typ
Max
Unit
Input Offset Voltage
Note 5
9.0
mV
T
A
= +25
C, Note 5
1.0
5.0
mV
Input Offset Current
I
IN
(+) I
IN
() V
CM
= 0V
150
nA
I
IN
(+) I
IN
() V
CM
= 0V, T
A
= +25
C
5.0
50
nA
Input Bias Current
I
IN
(+) or I
IN
() with Output in Linear Range, V
CM
= 0V,
Note 6
250
nA
I
IN
(+) or I
IN
() with Output in Linear Range, V
CM
= 0V,
T
A
= +25
C, Note 6
25
250
nA
Note 5. At output switch point, V
O
^
1.4V, R
S
= 0
, with V+ from 5V to 30V and over he full input
commonmode range (0V to V+ 1.5V), at 25
C.
Note 6. The direction of the input current is out of the IC due to the PNP input stage. This current
is essentially constant, independent of the state of the output so no loading change exists
on the reference or input lines.
Electrical Characteristics (Cont'd): (0
T
A
+70
C, V+ = 5V unless otherwise specified)
Parameter
Test Conditions
Min
Typ
Max
Unit
Input CommonMode
V+ = 30V, Note 7
0
V+ 2.0
V
Voltage Range
V+ = 30V, T
A
= +25
C, Note 7
0
V+ 1.5
V
Supply Current
R
L
=
on all Components, T
A
= +25
C
0.4
1.0
mA
R
L
=
on all Amps, V+ = 36V, T
A
= +25
C
1
25
mA
Voltage Gain
R
L
15k
, V+ = 15V, V
O
= 1V to 11V, T
A
= +25
C
50
200
V/mV
Large Signal Response Time
V
IN
= TTL Logic Swing, V
REF
= 1.4V, V
RL
= 5V,
R
L
= 1.5k
, T
A
= +25
C
300
ns
Response Time
V
RL
= 5V, R
L
= 1.5k
, T
A
= +25
C, Note 7
1.3
s
Output Sink Current
V
IN
() = 1V, V
IN
(+) = 0, V
O
1.5V, T
A
= +25
C
6
16
mA
Saturation Voltage
V
IN
() = 1V, V
IN
(+) = 0, I
SINK
4mA
700
mV
V
IN
() = 1V, V
IN
(+) = 0, I
SINK
4mA, T
A
= +25
C
250
400
mV
Output Leakage Current
V
IN
() = 0, V
IN
(+) = 1V, V
O
= 30V
1.0
A
V
IN
() = 0, V
IN
(+) = 1V, V
O
= 5V, T
A
= +25
C
0.1
nA
Differential Input Voltage
Keep All V
IN
's
0V (or V, if Used), Note 1
36
V
Note 1. Positive excursions of input voltage may exceed the power supply level. As long as the other
voltage remains within the commonmode range, the comparator will provide a proper out-
put state. The low input voltage state must not be less than 0.3V (or 0.3V below the the
magnitude of the negative power supply, if used).
Note 7. The response time specified is for a 100mV input step with 5mV overdrive. For larger over-
drive signals 300ns can be obtained.
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