LTC1726
Triple Supply Monitor and
P Supervisor with Adjustable
Reset and Watchdog Timer
Fea T Descrip T
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Monitors Three Inputs Simultaneously The LTC 1726 is a triple supply monitor and microproces-
LTC1726-5: 5V, 3.3V and ADJ sor supervisory circuit with adjustable reset and watchdog
LTC1726-2.5: 2.5V, 3.3V and ADJ functions intended for systems with multiple supply volt-
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1.5% Threshold Accuracy Over Temperature ages. The part has a common open-drain reset output
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Low Supply Current: 16A Typ with an adjustable delay. The reset and watchdog time-out
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Adjustable Reset Timeout periods are both adjustable using external capacitors.
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Adjustable Watchdog Timeout
Tight 1.5% accuracy specifications and glitch immunity
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Active Low Open-Drain Reset Output
ensure reliable reset operation without false triggering.
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Power Supply Glitch Immunity
n The RST output is guaranteed to be in the correct state for
Guaranteed RESET for V 1V or V /V 1V
CC3 CC25 CC5
n V /V or V down to 1V. The LTC1726 may also be
MS8 and SO-8 Packages CC5 CC25 CC3
configured to monitor any one or two V inputs instead
CC
of three, depending on system requirements.
a T
The low (16A typical) supply current makes the LTC1726
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Desktop Computers
ideal for power-conscious systems.
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Notebook Computers
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
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ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
Intelligent Instruments
of their respective owners.
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Portable Battery-Powered Equipment
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Network Servers
Typical a T
A 3.3V, 5V and 1.8V Monitor A 3.3V, 2.5V and 1.8V Monitor
1.8V 1.8V
(V = 1.665V) (V = 1.665V)
TRIP TRIP
3.3V R1 3.3V R1
66.5k 66.5k
0.1F 0.1F
1% 1%
2.5V
5V
R2 R2
2 1 3
2 1 3
100k 0.1F C 100k
0.1F C
RT
RT
V V V
V V V 1% 47nF 1%
47nF CC5 CC3 CCA CC25 CC3 CCA
8 6
8 6
RT RST RESET RT RST RESET
C
C WT
WT
LTC1726-2.5 P
LTC1726-5 P
47nF
47nF
5 5
7
7
WT WDI I/O WT WDI I/O
GND
GND
4 1726 TA01 4 1726 TA02
t = 155ms
t = 155ms RT
RT
t = 1s
t = 1s WT
WT
1726fd
1
For more information www.linear.com/LTC1726
ion pplica
ions pplica
ion uresLTC1726
a T e Maxi Mu M r a T (Notes 1, 2)
Terminal Voltage Operating Temperature Range (Note 3)
V , V /V , V ........................... 0.3V to 7V LTC1726E, LTC1726I ............................40C to 85C
CC3 CC5 CC25 CCA
RST .......................................................... 0.3V to 7V LTC1726H .......................................... 40C to 125C
WDI ......................................................... 0.3V to 7V Storage Temperature Range .................. 65C to 150C
RT, WT ..................................................... 0.3V to 7V Lead Temperature (Soldering, 10 sec) ...................300C
p c F T
TOP VIEW
TOP VIEW
V 1 8 RT
CC3
V 1 8 RT
CC3
WT
V /V 2 7
CC25 CC5
V /V 2 7 WT
CC25 CC5
V 3 6 RST
CCA
V 3 6 RST
CCA
GND 4 5 WDI
GND 4 5 WDI
MS8 PACKAGE
8-LEAD PLASTIC MSOP
S8 PACKAGE
T = 125C, = 200C/W
JMAX JA 8-LEAD PLASTIC SO
T = 125C, = 150C/W
JMAX JA
o r D i n F Ma T
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC1726EMS8-2.5#PBF LTC1726EMS8-2.5#TRPBF LTKZ 8-Lead Plastic MSOP 40C to 85C
LTC1726EMS8-5#PBF LTC1726EMS8-5#TRPBF LTLA 8-Lead Plastic MSOP 40C to 85C
LTC1726HMS8-5#PBF LTC1726HMS8-5#TRPBF LTLA 8-Lead Plastic MSOP 40C to 125C
LTC1726ES8-2.5#PBF LTC1726ES8-2.5#TRPBF 172625 8-Lead Plastic SO 40C to 85C
LTC1726ES8-5#PBF LTC1726ES8-5#TRPBF 17265 8-Lead Plastic SO 40C to 85C
LTC1726IS8-2.5#PBF LTC1726IS8-2.5#TRPBF 726I25 8-Lead Plastic SO 40C to 85C
LTC1726IS8-5#PBF LTC1726IS8-5#TRPBF 1726I5 8-Lead Plastic SO 40C to 85C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: