Microprocessor Supervisor Circuits
InfoCard 12
Linear Technology Corporation • 1630 McCarthy Blvd. • Milpitas, CA 95035-7417 • (408) 432-1900 • www.linear-tech.com • Literature Only: 1-800-4-LINEAR
Rev E 0100
Microprocessor Supervisory Circuits
Single Voltage Monitor Multiple Voltage Monitor
Triple Reset:
5V, 3.3V, and
Adjustable Threshold
4.65V Threshold
LTC1235
with Push-Button Reset and
Battery Backup Switching
LTC690
Battery Backup Switching
LTC691
Battery Backup Switching
and RAM Write Protect
LTC694
Battery Backup Switching
and 200ms Reset
Pulse Width
LTC695
Battery Backup Switching,
RAM Write Protect and 200ms
Reset Pulse Width
LTC699
200ms Reset Pulse Width
LTC692
Battery Backup Switching
LTC693
Battery Backup Switching
and RAM Write Protect
LTC694-3.3
Battery Backup Switching
and 200ms, Reset Pulse Width
LTC695-3.3
Battery Backup Switching,
RAM Write Protect and 200ms
Reset Pulse Width
LTC1232
4.62V or 4.37V Threshold
with Push-Button Reset
4.40V Threshold
2.90V Threshold
LTC1326
±0.75% Threshold Accuracy
Push-Button Reset
LTC1536
Meets PCI tFAIL
Timing Specifications
Push-Button Reset
LTC1726-5
MSOP, Adj Watchdog Timer
LTC1727-5
MSOP, 15µA Supply Current,
Monitor Output for Each Supply
LT1728-5
SOT-23, 15µA Supply Current,
Glitch Immunity
Selectable
Threshold
Triple Reset:
3.3V, 2.5V, and
Adjustable Threshold
LTC1326-2.5
±0.75% Threshold Accuracy
Push-Button Reset
LTC1726-2.5
MSOP, Adj Watchdog Timer
LTC1727-2.5
MSOP, 15µA Supply Current,
Monitor Output for Each Supply
LTC1728-2.5
SOT-23, 15µA Supply Current,
Glitch Immunity
NEW!
NEW IN
SOT-23!
NEW IN
SOT-23!
NEW!
Microprocessor Supervisor Circuits
InfoCard 12
LTC1235 4.65 200 1.0 600 16 16
LTC690 4.65 50 1.0 600 8 8
LTC691 4.65 50 1.0 600 16 16
LTC692 4.40 200 1.0 600 8 8
LTC693 4.40 200 1.0 600 16 16
LTC694/ 4.65 200 1.0 600 8 8
LTC694-3.3 2.90
LTC695/ 4.65 200 1.0 600 16 16
LTC695-3.3 2.90
LTC699 4.65 200 1.0 600 8 8
LTC1232 4.62 610 1.0 500 8 8
or 4.37
LTC1326/ 4.725 3.118 Adj 200 1.0 40 8 8
LTC1326-2.5 2.985 2.363 Adj 200 1.0 40 8 8
LTC1536 4.725 2.985 Adj 200 1.0 40 8 8
LTC1726-5 Adj 4.750 3.135 Adj Adj 1.0 20 8 8
LTC1726-2.5 Adj 3.135 2.375 Adj Adj 1.0 20 8 8
LTC1727-5 4.750 3.135 Adj 200 1.0 15 8 8
LTC1727-2.5 3.135 2.375 Adj 200 1.0 15 8 8
LTC1728-5 4.750 3.135 Adj 200 1.0 15 5
LTC1728-2.5 3.135 2.375 Adj 200 1.0 15 5
Linear Technology Corporation • 1630 McCarthy Blvd. • Milpitas, CA 95035-7417 • (408) 432-1900 • www.linear-tech.com • Literature Only: 1-800-4-LINEAR
ic12e ©1992 LT/TP 0100 4K
Typical Applications
Push-Button Reset
Battery Backup Switching
UL Recognized
Conditional Battery Backup
RAM Write Protect
Watchdog Timer
Power Fail Warning
Power Up/Down Reset
Reset Threshold (V)
Second Reset Threshold
Third Reset Threshold
Reset Pulse Width (ms)
Guaranteed V
CC
Reset Level (V)
Power Supply Current (µA)
PDIP
SO
MSOP
SOT-23
Notes: LTC1536: t
FAIL
timing meets PCI specifications
Bold indicates new product
V
CC5
RT
C
RT
47nF
C
WT
47nF
21
4
3
6
R1
66.5k
1%
t
RT
= 155ms
t
WT
= 1s
R2
100k
1%
5
8
0.1µF
7
1726 TA01
LTC1726-5
WT
RST
WDI
V
CC3
5V
3.3V
1.8V
(V
TRIP
= 1.665V)
GND
V
CCA
µP
RESET
I/O
0.1µF
V
CC25
RT
C
RT
47nF
C
WT
47nF
21
4
3
6
t
RT
= 155ms
t
WT
= 1s
R2
100k
1%
5
8
0.1µF
7
1726 TA02
LTC1726-2.5
WT
RST
WDI
V
CC3
2.5V
3.3V
1.8V
(V
TRIP
= 1.665V)
GND
V
CCA
µP
RESET
I/O
0.1µF
R1
66.5k
1%
A 3.3V, 5V and 1.8V Monitor A 3.3V, 2.5V and 1.8V Monitor
