LTC1540C View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTC1540C

Nanopower Comparator with Reference

Linear Technology 

LTC1540

Nanopower Comparator

with Reference

FEATURES

■ Ultralow Quiescent Current: 0.3µA Typ

■ Reference Output Drives 0.01µF 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

■ 60µs Propagation Delay with 10mV Overdrive

■ No Crowbar Current

■ 40mA Continuous Source Current

■ Pin Compatible with LTC1440, MAX921, MAX931

U

APPLICATIO S

■ Battery-Powered System Monitoring

■ Threshold Detectors

■ Window Comparators

■ Oscillator Circuits

, LTC and LT are registered trademarks of Linear Technology Corporation.

TYPICAL APPLICATIO

Nanopower 2.9V VCC 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–

GND

2

1

1540 • TA01

DESCRIPTIO

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. For space limited applications, the LTC1540 is

available in a 3mm x 3mm low profile (0.8mm) dual fine-

pitch leadless package (DFN).

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

sn1540 1540fas

1

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