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LTC1540| Datasheet

By datasheet - November 4th, 2008

LTC1540| Datasheet

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LTC1540 Nanopower Comparator with Reference

FEATURES

DESCRIPTIO

Ultralow Quiescent Current: 0.3uA Typ Reference Output Drives 0.01uF Capacitor Adjustable Hysteresis Available in 3mm x 3mm x 0.8mm DFN Package Wide Supply Range: 2V to 11V Input Voltage Range Includes the Negative Supply Reference Output Sources Up to 1mA TTL/CMOS Compatible Outputs 60us Propagation Delay with 10mV Overdrive No Crowbar Current 40mA Continuous Source Current Pin Compatible with LTC1440, MAX921, MAX931

The LTC 1540 is an ultralow power, single comparator with built-in reference. The comparator's features include less than 0.6uA supply current over the commercial temperature range, a 1.182V 2% reference, programmable hysteresis and TTL/CMOS outputs that sink and source current. The reference output can drive a bypass capacitor of up to 0.01uF 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 comparator 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. For space limited applications, the LTC1540 is available in a 3mm x 3mm low profile (0.8mm) dual finepitch leadless pac
kage (DFN).

APPLICATIO S

Battery-Powered System Monitoring Threshold Detectors Window Comparators Oscillator Circuits
, LTC and LT are registered trademarks of Linear Technology Corporation.

TYPICAL APPLICATIO
3.3V

Nanopower 2.9V VCC Threshold Detector

LTC1540 Supply Current vs Temperature

0.50

R1 4.32M 1% R2 3M 1%

7 V+ 3 IN + LTC1540
0.45

V + = 5V V = GND = 0V

SUPPLY CURRENT (uA)

+
8 OUT

0.40 0.35 0.30 0.25 0.20 0.15 40 20

4 IN

5 HYST

6 REF

V 2

GND 1
1540 TA01

U
40 20 60 0 TEMPERATURE ( C) 80 100
1540 TA02

U

U

sn1540 1540fas

1


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