LTC1443/LTC1444/LTC1445
Ultralow Power Quad
Comparators with Reference
FEATURES
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DESCRIPTIO
®
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Ultralow Quiescent Current: 8.5
µ
A Max
Wide Supply Range
Single: 2V to 11V
Dual:
±1V
to
±5.5V
Input Voltage Range Includes the Negative Supply
Reference Output Drives 0.01
µ
F Capacitor
Adjustable Hysteresis (LTC1444/LTC1445)
TTL/CMOS Compatible Outputs
Propagation Delay: 12µs (Typ) (10mV Overdrive)
No Crowbar Current
40mA Continuous Source Current
Pin Compatible Upgrades for MAX924 (LTC1443)
The LTC 1443/LTC1444/LTC1445 are ultralow power quad
comparators with a built-in reference. The comparators
feature less than 8.5µA supply current over temperature,
an internal reference (1.182V
±1%
for LTC1443 or 1.221V
±1%
for LTC1444/LTC1445), programmable hysteresis
(LTC1444/LTC1445) and TTL/CMOS output (LTC1443/
LTC1445) that sinks and sources current (open-drain
output for LTC1444). The reference output can drive a
bypass capacitor of up to 0.01µF without oscillation.
The comparators operate from a single 2V to 11V supply
or a dual
±1V
to
±5.5V
supply (LTC1443). Comparator
hysteresis is easily programmable using two resistors and
the HYST pin (LTC1444/LTC1445). Each comparator’s
input operates from the negative supply to within 1.3V of
the positive supply. The LTC1443/LTC1445 comparator
output stage can continuously source up to 40mA. By
eliminating the cross-conducting current that normally
happens when the comparator changes logic states, power
supply glitches are eliminated.
The LTC1443/LTC1444/LTC1445 are available in the
16-pin SO and PDIP packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
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Battery-Powered System Monitoring
Threshold Detectors
Window Comparators
Oscillator Circuits
TYPICAL APPLICATIO
V
IN
3.4M
1%
5V
TO 8V
Reference Settling Test Circuit
3
V
5 IN A
+
+
8V
V
+
5V
2
2mV/DIV
+
OUT
V
REF
4 IN A
–
–
LTC1445
V
–
9
OUT
2ms/DIV
LTC1443/1444/1445 • TA02
14 HYST
1.21M
1%
R1
10k
R2
2.4M
8 REF
R3
430Ω
C1
1.0µF
LTC1443/44/45 • TA01
U
Reference Settling
U
U
1
LINER [ LINEAR TECHNOLOGY ]
