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LTC1726 Datasheet(PDF) 1 Page - Linear Technology

Part No. LTC1726
Description  Triple Supply Monitor and uP Supervisor with Adjustable Reset and Watchdog Timer
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC1726 Datasheet(HTML) 1 Page - Linear Technology

 
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LTC1726
Final Electrical Specifications
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
Triple Supply Monitor and
µP Supervisor with Adjustable
Reset and Watchdog Timer
January 2000
s
Monitors Three Inputs Simultaneously
LTC1726-5: 5V, 3.3V and ADJ
LTC1726-2.5: 2.5V, 3.3V and ADJ
s
±1.5% Threshold Accuracy Over Temperature
s
Low Supply Current: 16
µA Typ
s
Adjustable Reset Timeout
s
Adjustable Watchdog Timeout
s
Active Low Open-Drain Reset Output
s
Power Supply Glitch Immunity
s
Guaranteed RESET for VCC3 ≥ 1V or VCC25/VCC5 ≥ 1V
s
MS8 and SO-8 Packages
The LTC
®1726 is a triple supply monitor and microproces-
sor supervisory circuit with adjustable reset and watchdog
functions intended for systems with multiple supply volt-
ages. The part has a common open-drain reset output with
an adjustable delay. The reset and watchdog time-out
periods are both adjustable using external capacitors.
Tight 1.5% accuracy specifications and glitch immunity
ensure reliable reset operation without false triggering.
The RST output is guaranteed to be in the correct state for
VCC5/VCC25 or VCC3 down to 1V. The LTC1726 may also be
configured to monitor any one or two VCC inputs instead
of three, depending on system requirements.
The low (16
µA typical) supply current makes the LTC1726
ideal for power-conscious systems.
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
Desktop Computers
s
Notebook Computers
s
Intelligent Instruments
s
Portable Battery-Powered Equipment
s
Network Servers
VCC5
RT
CRT
47nF
CWT
47nF
21
4
3
6
R1
66.5k
1%
tRT = 155ms
tWT= 1s
R2
100k
1%
5
8
0.1
µF
7
1726 TA01
LTC1726-5
WT
RST
WDI
VCC3
5V
3.3V
1.8V
(VTRIP = 1.665V)
GND
VCCA
µP
RESET
I/O
0.1
µF
VCC25
RT
CRT
47nF
CWT
47nF
21
4
3
6
tRT = 155ms
tWT= 1s
R2
100k
1%
5
8
0.1
µF
7
1726 TA02
LTC1726-2.5
WT
RST
WDI
VCC3
2.5V
3.3V
1.8V
(VTRIP = 1.665V)
GND
VCCA
µP
RESET
I/O
0.1
µF
R1
66.5k
1%
A 3.3V, 5V and 1.8V Monitor
A 3.3V, 2.5V and 1.8V Monitor
FEATURES
DESCRIPTIO
DESCRIPTIO
TYPICAL APPLICATIO S


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