Datasheet

LTC1727/LTC1728
16
17278fb
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
●
www.linear.com
 LINEAR TECHNOLOGY CORPORATION 1999
LT 0207 REV B • PRINTED IN USA
Triple Supply Monitor with Manual Reset Button
relaTeD parTs
Typical applicaTion
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
LTC1445
Micropower Quad Comparators with 1% Reference LTC1443 Has 1.182V Reference, LTC1444/LTC1445
Have 1.221V Reference and Adjustable Hysteresis
LTC1536 Precision Triple Supply Monitor for PCI Applications Meets PCI t
FAIL
Timing Specifications
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
V
CC3
V
CC5
V
CCA
RST
GND
LTC1728-5
1727/28 TA02
100nF
5
5V 3.3V
12V (±5%)
V
TRIP
= 11.2V
(±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
V
TRIP
= (R1 + R2)
R1 = R2
– 1
V
CCA
R2
( )
V
TRIP
V
CCA