LTC1726EMS8-2.5 Linear Technology, LTC1726EMS8-2.5 Datasheet

IC TRPL SPLY MONITOR 2.5V 8-MSOP

LTC1726EMS8-2.5

Manufacturer Part Number
LTC1726EMS8-2.5
Description
IC TRPL SPLY MONITOR 2.5V 8-MSOP
Manufacturer
Linear Technology
Type
Multi-Voltage Supervisorr
Datasheet

Specifications of LTC1726EMS8-2.5

Number Of Voltages Monitored
3
Output
Open Drain or Open Collector
Reset
Active Low
Reset Timeout
Adjustable/Selectable
Voltage - Threshold
2.337V, 3.085V, Adj
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
Q1279395

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Part Number
Manufacturer
Quantity
Price
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LT
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Part Number:
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LTC1726EMS8-2.5#TRPBF
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FeaTures
applicaTions
Typical applicaTion
n
n
n
n
n
n
n
n
n
n
n
n
n
n
Monitors Three Inputs Simultaneously
±1.5% Threshold Accuracy Over Temperature
Low Supply Current: 16µA Typ
Adjustable Reset Timeout
Adjustable Watchdog Timeout
Active Low Open-Drain Reset Output
Power Supply Glitch Immunity
Guaranteed RESET for V
MS8 and SO-8 Packages
Desktop Computers
Notebook Computers
Intelligent Instruments
Portable Battery-Powered Equipment
Network Servers
3.3V
5V
LTC1726-5: 5V, 3.3V and ADJ
LTC1726-2.5: 2.5V, 3.3V and ADJ
0.1µF
0.1µF
47nF
t
t
C
RT
WT
WT
A 3.3V, 5V and 1.8V Monitor
= 155ms
= 1s
47nF
C
RT
8
7
V
RT
WT
CC5
2
LTC1726-5
CC3
V
GND
CC3
1
4
≥ 1V or V
V
RST
WDI
CCA
3
(V
TRIP
6
5
1.8V
= 1.665V)
CC25
R1
66.5k
1%
R2
100k
1%
/V
RESET
I/O
CC5
µP
1726 TA01
≥ 1V
µP Supervisor with Adjustable
Reset and Watchdog Timer
DescripTion
The LTC
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
configured to monitor any one or two V
of three, depending on system requirements.
The low (16µA typical) supply current makes the LTC1726
ideal for power-conscious systems.
L, LT, LTC, LTM, 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.
CC5
Triple Supply Monitor and
3.3V
2.5V
/V
CC25
®
0.1µF
0.1µF
1726 is a triple supply monitor and microproces-
or V
47nF
t
t
C
A 3.3V, 2.5V and 1.8V Monitor
RT
WT
CC3
WT
= 155ms
= 1s
47nF
C
RT
down to 1V. The LTC1726 may also be
8
7
V
RT
WT
CC25
LTC1726-2.5
2
V
GND
CC3
1
4
V
RST
WDI
CCA
3
(V
TRIP
6
5
1.8V
= 1.665V)
CC
LTC1726
R1
66.5k
1%
R2
100k
1%
inputs instead
RESET
I/O
µP
1726 TA02
1726fc
1

Related parts for LTC1726EMS8-2.5

LTC1726EMS8-2.5 Summary of contents

Page 1

... The low (16µA typical) supply current makes the LTC1726 ideal for power-conscious systems. L, LT, LTC, LTM, 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. 1. ...

Page 2

... GND 4 MS8 PACKAGE 8-LEAD PLASTIC MSOP = 125°C, θ 200°C/W JMAX JA orDer inForMaTion LEAD FREE FINISH TAPE AND REEL LTC1726EMS8-2.5#PBF LTC1726EMS8-2.5#TRPBF LTC1726EMS8-5#PBF LTC1726EMS8-5#TRPBF LTC1726HMS8-5#PBF LTC1726HMS8-5#TRPBF LTC1726ES8-2.5#PBF LTC1726ES8-2.5#TRPBF LTC1726ES8-5#PBF LTC1726ES8-5#TRPBF LTC1726IS8-2.5#PBF LTC1726IS8-2.5#TRPBF LTC1726IS8-5#PBF LTC1726IS8-5#TRPBF Consult LTC Marketing for parts specified with wider operating temperature ranges. ...

Page 3

T SYMBOL PARAMETER V Reset Threshold V RT3 CC3 V Reset Threshold V RT5 CC5 V Reset Threshold V RT25 CC25 V Reset Threshold V RTA CCA Operating ...

Page 4

LTC1726 elecTrical characTerisTics Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: All voltage ...

Page 5

Typical perForMance characTerisTics I vs Temperature VCC25 (LTC1726-2.5) 1 3.3V CC3 1 2.5V CC25 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 –60 –40 – 100 TEMPERATURE (°C) 1726 G07 ...

Page 6

LTC1726 pin FuncTions V (Pin 1): 3.3V Sense Input. This pin also supplies CC3 power to the part when the voltage on this pin is greater than the voltage Bypass this pin to ground CC25 CC5 ...

Page 7

DiagraM WDI 5 V CC3 CC5 CC25 2 V CCA 3 GND 4 TiMing DiagraM V Monitor Timing CC V RTX V CCX RST WATCHDOG TRANSITION DETECT TIMER – + – + – ...

Page 8

LTC1726 applicaTions inForMaTion Supply Monitoring The LTC1726 is a low power, high accuracy triple supply monitor and watchdog timer. The watchdog and reset periods are both adjustable using external capacitors. All three V inputs must be above predetermined thresh- CC ...

Page 9

Figure 3 contains a simple circuit for 5V systems that can’t risk the RST output going high in the 3.1V to 4.15V range (possibly due to very slow rise time on the 5V supply). Diode D1 powers the ...

Page 10

LTC1726 applicaTions inForMaTion Selecting the Reset and Watchdog Time-Out Capacitors The reset time-out period is adjustable in order to accom- modate a variety of µP applications. The reset time-out period adjusted by connecting a capacitor ...

Page 11

Typical applicaTions 3.3V OR R1* ADJUSTABLE SUPPLY *TO PRESERVE THRESHOLD ACCURACY, SET PARALLEL COMBINATION OF R1 AND R2 ≤ 66.5k ADJUSTABLE SUPPLY LTC1435 ADJUSTABLE RESET TRIP THRESHOLD 2.74V Dual Supply Monitor (3. Plus Adjustable) REFER TO LTC1726-X OVERRIDE ...

Page 12

LTC1726 package DescripTion 5.23 (.206) MIN 0.42 ± 0.038 (.0165 ± .0015) TYP RECOMMENDED SOLDER PAD LAYOUT GAUGE PLANE 0.18 (.007) NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR ...

Page 13

... Added H-grade to Absolute Maximum Ratings and Electrical Characteristics sections. 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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 14

... ThinSOT™ and 3mm × 2mm DFN Packages 8 Low Voltage Adjustable Inputs (0.5V) www.linear.com ● 47nF RT 47nF WT RST RESET µP WDI I/O 1726 TA09 V CCA ( 155ms TRIP – CCA Timing Specifications FAIL LT 1110 REV C • PRINTED IN USA  LINEAR TECHNOLOGY CORPORA TION 2000 1726fc ...

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