LTC1540 Datasheet, PDF (1/12 Pages) Linear Technology – Nanopower Comparator with Reference

LTC1540
Nanopower Comparator
with Reference
FEATURES
s _{Ultralow Quiescent Current: 0.3µA Typ}
s _{Reference Output Drives 0.01µF Capacitor}
s _{Adjustable Hysteresis}
s _{Wide Supply Range: 2V to 11V}
s _{Input Voltage Range Includes the Negative Supply}
s _{Reference Output Sources Up to 1mA}
s _{TTL/CMOS Compatible Outputs}
s _{60µs Propagation Delay with 10mV Overdrive}
s _{No Crowbar Current}
s _{40mA Continuous Source Current}
s _{Pin Compatible with LTC1440, MAX921, MAX931}
U
APPLICATIONS
s _{Battery-Powered System Monitoring}
s _{Threshold Detectors}
s _{Window Comparators}
s _{Oscillator Circuits}
TYPICAL APPLICATION
Nanopower 2.9V V_CC Threshold Detector
3.3V
R1
4.32M
1%
R2
3M
1%
3 IN⁺
4 IN^–
7
V ⁺ LTC1540
+
8
OUT
–
5 HYST
6 REF
V^–
2
GND
1
1540 • TA01
DESCRIPTION
The LTC^®1540 is an ultralow power, single comparator
with built-in reference. The comparator’s features
include less than 0.6µA supply current over the commer-
cial temperature range, a 1.182V ±2% reference, pro-
grammable hysteresis and TTL/CMOS outputs that sink
and source current. The reference output can drive a
bypass capacitor of up to 0.01µF without oscillation.
The comparator operates from a single 2V to 11V supply
or a dual ±1V to ±5.5V supply. Comparator hysteresis is
easily programmed by using two resistors and the HYST
pin. Each comparator’s input operates from the negative
supply to within 1.3V of the positive supply. The compara-
tor output stage can continuously source up to 40mA. By
eliminating the cross-conducting current that normally
occur when the comparator changes logic states, power
supply glitches are eliminated.
The LTC1540 is available in the 8-pin MSOP and SO
packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTC1540 Supply Current vs Temperature
0.50
V⁺ = 5V
0.45 V^– = GND = 0V
0.40
0.35
0.30
0.25
0.20
0.15
–40 –20
0 20 40 60
TEMPERATURE (°C)
80 100
1540 • TA02
1