LTC1443 Datasheet, PDF (1/12 Pages) Linear Technology – Ultralow Power Quad Comparators with Reference

LTC1443/LTC1444/LTC1445
Ultralow Power Quad
Comparators with Reference
FEATURES
s _{Ultralow Quiescent Current: 8.5µA Max}
s _{Wide Supply Range}
Single: 2V to 11V
Dual: ±1V to ±5.5V
s _{Input Voltage Range Includes the Negative Supply}
s _{Reference Output Drives 0.01µF Capacitor}
s _{Adjustable Hysteresis (LTC1444/LTC1445)}
s _{TTL/CMOS Compatible Outputs}
s _{Propagation Delay: 12µs (Typ) (10mV Overdrive)}
s _{No Crowbar Current}
s _{40mA Continuous Source Current}
s _{Pin Compatible Upgrades for MAX924 (LTC1443)}
U
APPLICATIO S
s _{Battery-Powered System Monitoring}
s _{Threshold Detectors}
s _{Window Comparators}
s _{Oscillator Circuits}
DESCRIPTIO
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.
TYPICAL APPLICATIO
Reference Settling Test Circuit
V_IN
3.4M
1%
1.21M
1%
5V
TO 8V
R1
10k
R2
2.4M
3
V⁺
5 IN A⁺ ₊
4 IN A^– _–
2
OUT
14 HYST
8 REF
LTC1445
R3
430Ω
C1
1.0µF
V^–
9
LTC1443/44/45 • TA01
8V
V⁺
5V
V_REF
OUT
Reference Settling
2ms/DIV
LTC1443/1444/1445 • TA02
1