16

LTC1727/LTC1728

©LINEAR TECHNOLOGY CORPORATION 1999

17278f LT/TP 0400 4K • PRINTED IN THE USA

PART NUMBER

DESCRIPTION

COMMENTS

LTC690

5V Supply Monitor, Watchdog Timer and Battery Backup

4.65V Threshold

LTC694-3.3

3.3V Supply Monitor, Watchdog Timer and Battery Backup

2.9V Threshold

LTC699

5V Supply Monitor and Watchdog Timer

4.65V Threshold

LTC1232

5V Supply Monitor, Watchdog Timer and Push-Button Reset

4.37V/4.62V Threshold

LTC1326

Micropower Precision Triple Supply Monitor for 5V, 3.3V and ADJ

4.725V, 3.118V, 1V Thresholds (

±0.75%)

LTC1326-2.5

Micropower Precision Triple Supply Monitor for 2.5V, 3.3V and ADJ

2.363V, 3.118V, 1V Thresholds (

±0.75%)

LTC1443/LTC1444

Micropower Quad Comparators with 1% Reference

LTC1443 Has 1.182V Reference, LTC1444/LTC1445

LTC1445

Have 1.221V Reference and Adjustable Hysteresis

LTC1536

Precision Triple Supply Monitor for PCI Applications

LTC1540

Nanopower Comparator with 2% Reference

1.182V Reference, 300nA Supply Current, 8-Pin MSOP

LTC1726-2.5

Micropower Triple Supply Monitor for 2.5V, 3.3V and ADJ

Adjustable RESET and Watchdog Time Outs

LTC1726-5

Micropower Triple Supply Monitor for 5V, 3.3V and ADJ

Adjustable RESET and Watchdog Time Outs

LTC1985-1.8

Micropower Triple Supply Monitor for 3.3V, 1.8V and ADJ

Push-Pull RESET Output, SOT-23

RELATED PARTS

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

TYPICAL APPLICATIO

Triple Supply Monitor with Manual Reset Button

RST

GND

LTC1728-5

1727/28 TA02

100nF

5

5V

3.3V

12V (

±5%)

(

±0.17V)

1

2

R2

105k

0.1%

*OPTIONAL RESISTOR RECOMMENDED

TO EXTEND ESD TOLERANCE

R3*

10k

5%

MANUAL

RESET BUTTON

(NORMALLY OPEN)

4

3

R1

1.07M

0.1%

100nF

(R1 + R2)

R1 = R2

– 1

R2

()