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LTC1726IS8-5#PBF

P1-P3P4-P6P7-P9P10-P12P13-P14
LTC1726
1
1726fd
For more information www.linear.com/LTC1726
Typical applicaTion
FeaTures DescripTion
Triple Supply Monitor and
µP Supervisor with Adjustable
Reset and Watchdog Timer
The LT C
®
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
V
CC5
/V
CC25
or V
CC3
down to 1V. The LTC1726 may also be
configured to monitor any one or two V
CC
inputs instead
of three, depending on system requirements.
The low (16µA typical) supply current makes the LTC1726
ideal for power-conscious systems.
L, LT , LT C , LT M , Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
applicaTions
n
Monitors Three Inputs Simultaneously
LTC1726-5: 5V, 3.3V and ADJ
LTC1726-2.5: 2.5V, 3.3V and ADJ
n
±1.5% Threshold Accuracy Over Temperature
n
Low Supply Current: 16µA Typ
n
Adjustable Reset Timeout
n
Adjustable Watchdog Timeout
n
Active Low Open-Drain Reset Output
n
Power Supply Glitch Immunity
n
Guaranteed RESET for V
CC3
≥ 1V or V
CC25
/V
CC5
≥ 1V
n
MS8 and SO-8 Packages
n
Desktop Computers
n
Notebook Computers
n
Intelligent Instruments
n
Portable Battery-Powered Equipment
n
Network Servers
A 3.3V, 5V and 1.8V Monitor A 3.3V, 2.5V and 1.8V Monitor
V
CC5
RT
C
RT
47nF
C
WT
47nF
2 1
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
2 1
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%
LTC1726
2
1726fd
For more information www.linear.com/LTC1726
absoluTe MaxiMuM raTings
Terminal Voltage
V
CC3
, V
CC5
/V
CC25
, V
CCA
........................... –0.3V to 7V
RST .......................................................... –0.3V to 7V
WDI ......................................................... –0.3V to 7V
RT, WT ..................................................... –0.3V to 7V
(Notes 1, 2)
1
2
3
4
V
CC3
V
CC25
/V
CC5
V
CCA
GND
8
7
6
5
RT
WT
RST
WDI
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C, θ
JA
= 200°C/W
1
2
3
4
8
7
6
5
TOP VIEW
RT
WT
RST
WDI
V
CC3
V
CCA
GND
S8 PACKAGE
8-LEAD PLASTIC SO
V
CC25
/V
CC5
T
JMAX
= 125°C, θ
JA
= 150°C/W
pin conFiguraTion
orDer inForMaTion
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 –40°C to 85°C
LTC1726EMS8-5#PBF LTC1726EMS8-5#TRPBF LTLA 8-Lead Plastic MSOP –40°C to 85°C
LTC1726HMS8-5#PBF LTC1726HMS8-5#TRPBF LTLA 8-Lead Plastic MSOP –40°C to 125°C
LTC1726ES8-2.5#PBF LTC1726ES8-2.5#TRPBF 172625 8-Lead Plastic SO –40°C to 85°C
LTC1726ES8-5#PBF LTC1726ES8-5#TRPBF 17265 8-Lead Plastic SO –40°C to 85°C
LTC1726IS8-2.5#PBF LTC1726IS8-2.5#TRPBF 726I25 8-Lead Plastic SO –40°C to 85°C
LTC1726IS8-5#PBF LTC1726IS8-5#TRPBF 1726I5 8-Lead Plastic SO –40°C to 85°C
Consult LT C Marketing for parts specified with wider operating temperature ranges.
Consult LT C Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
Operating Temperature Range (Note 3)
LTC1726E, LTC1726I ............................–40°C to 85°C
LTC1726H .......................................... –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec) ...................300°C
LTC1726
3
1726fd
For more information www.linear.com/LTC1726
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC3
= 3.3V, V
CC5
= 5V, V
CC25
= 2.5V, V
CCA
= V
CC3
unless otherwise noted.
elecTrical characTerisTics
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
RT3
Reset Threshold V
CC3
V
CC3
Input Threshold
H-Grade
l
l
3.036
3.023
3.085
3.085
3.135
3.147
V
V
V
RT5
Reset Threshold V
CC5
V
CC5
Input Threshold (5V Version)
H-Grade
l
l
4.600
4.582
4.675
4.675
4.750
4.769
V
V
V
RT25
Reset Threshold V
CC25
V
CC25
Input Threshold (2.5V Version),
l
2.300 2.337 2.375 V
V
RTA
Reset Threshold V
CCA
V
CCA
Input Threshold
H-Grade
l
l
0.985
0.978
1.000
1.000
1.015
1.022
V
V
V
CC
V
CC3
or V
CC5
Operating Voltage RST in Correct Logic State
l
1 7 V
I
VCC3
V
CC3
Supply Current V
CC5
/V
CC25
> V
CC3
V
CC5
/V
CC25
< V
CC3
, V
CC3
= 3.3V
l
l
1
16
2
30
µA
µA
I
VCC5
V
CC5
Supply Current V
CC5
= 5V
l
16 30 µA
I
VCC25
V
CC25
Supply Current V
CC25
< V
CC3
, V
CC25
= 2.5V (Note 4)
l
1 2 µA
I
VCCA
V
CCA
Input Current V
CCA
= 1V
l
–15 0 15 nA
RT Charge Current Out V
RT
= 0V
H-Grade
l
l
1.4
1.3
2
2
2.6
2.6
µA
µA
WT Charge Current Out V
WT
= 0V
H-Grade
l
l
1.4
1.3
2
2
2.6
2.6
µA
µA
RT Discharge Current Out V
RT
= 1.3V
H-Grade
l
l
14
13
20
20
26
28
µA
µA
WT Discharge Current Out V
WT
= 1.3V
H-Grade
l
l
14
13
20
20
26
28
µA
µA
∆t
RT
Reset Time-Out Period Variation C
RT
= 1500pF Deviation from t
RT
= 5ms (Note 5)
H-Grade
l
l
–30
–45
0
0
30
45
%
%
t
UV
V
CC
Undervoltage Detect to RST V
CC25
/V
CC5
, V
CC3
or V
CCA
Less Than Reset
Threshold V
RT
by More Than 1%
130 µs
V
OH
RST Output Voltage High (Note 6) I
SOURCE
= 1µA
l
V
CC3
– 1 V
V
OL
RST Output Voltage Low I
SINK
= 2.5mA, V
CC5
/V
CC25
= 0V
I
SINK
= 100µA, V
CC3
= 1V, V
CC5
/V
CC25
= 0V
I
SINK
= 100µA, V
CC3
= 0V, V
CC5
/V
CC25
= 1V
I
SINK
= 100µA, V
CC3
= 1V, V
CC5
/V
CC25
= 1V
l
l
l
l
0.15
0.05
0.05
0.05
0.4
0.3
0.3
0.3
V
V
V
V
V
IH
WDI Input Threshold High
l
0.7 • V
CC3
V
V
IL
WDI Input Threshold Low
l
0.3 • V
CC3
V
t
WP
WDI Pulse Width
l
40 ns
∆t
WT
Watchdog Time-Out Period Variation C
WT
= 1500pF Deviation from t
WT
= 33ms (Note 5)
H-Grade
l
l
–30
–45
0
0
30
45
%
%
WDI Leakage Current
l
±1 µA
LTC1726-5 Only
V
OVR
V
CC5
Reset Override Voltage (Note 7) Override V
CC5
Ability to Assert RST V
CC3
±0.025 V
P1-P3P4-P6P7-P9P10-P12P13-P14

LTC1726IS8-5#PBF

Mfr. #:
Buy LTC1726IS8-5#PBF
Manufacturer:
Analog Devices Inc.
Description:
Supervisory Circuits 3x S Mon & P Sup w/ Adj Reset & Watch
Lifecycle:
New from this manufacturer.
Delivery:
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