1

LTC1443/LTC1444/LTC1445

Ultralow Power Quad

Comparators with Reference

s

Ultralow Quiescent Current: 8.5

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 0.01

s

Adjustable Hysteresis (LTC1444/LTC1445)

s

TTL/CMOS Compatible Outputs

s

Propagation Delay: 12

µs (Typ) (10mV Overdrive)

s

No Crowbar Current

s

40mA Continuous Source Current

s

Pin Compatible Upgrades for MAX924 (LTC1443)

The LTC

comparators with a built-in reference. The comparators

feature less than 8.5

µA 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 0.01

µF 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.

s

Battery-Powered System Monitoring

s

Threshold Detectors

s

Window Comparators

s

Oscillator Circuits

Reference Settling Test Circuit

–

+

5

OUT

R1

10k

R3

430

Ω

R2

2.4M

C1

1.0

µF

HYST

REF

4

14

8

5V

TO 8V

LTC1443/44/45 • TA01

LTC1445

3

9

2

1.21M

1%

3.4M

1%

Reference Settling

8V

5V

OUT

2ms/DIV

LTC1443/1444/1445 • TA02

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO