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LTC1726 Datasheet(PDF) 3 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) 3 Page - Linear Technology

 
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LTC1726
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: All voltage values are with respect to GND.
Note 3: The LTC1726E is guaranteed to meet performance specifications
from 0
°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
The q denotes specifications which apply over the full operating
temperature range, otherwise specificaitons are at TA = 25°C. VCC3 = 3.3V, VCC5 = 5V, VCC25 = 2.5V, VCCA = VCC3 unless
otherwise noted.
VCC5 Threshold Voltage
vs Temperature
TEMPERATURE (
°C)
–60
4.600
4.625
4.650
4.675
4.700
–20
20
60
100
1726 G01
4.725
4.750
–40
0
40
80
VCC3 Threshold Voltage
vs Temperature
TEMPERATURE (
°C)
–60
3.035
3.045
3.065
3.075
3.085
3.135
3.105
–20
20
40
1726 G02
3.055
3.115
3.125
3.095
–40
0
60
80
100
TEMPERATURE (
°C)
–60
1.000
1.005
1.015
1.010
0
40
100
1726 G03
0.995
0.990
0.985
–40 –20
20
60
80
VCCA Threshold Voltage
vs Temperature
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
tRT
Reset Time-Out Period
CRT = 1500pF
q
3.5
5
6.5
ms
tUV
VCC Undervoltage Detect to RST
VCC25/VCC5, VCC3 or VCCA Less Than Reset
130
µs
Threshold VRT by More Than 1%
VOH
RST Output Voltage High (Note 5)
ISOURCE = 1µA
q
VCC3 – 1
V
VOL
RST Output Voltage Low
ISINK = 2.5mA, VCC5/VCC25 = 0V
q
0.15
0.4
V
ISINK = 100µA, VCC3 = 1V, VCC5/VCC25 = 0V
q
0.05
0.3
V
ISINK = 100µA, VCC3 = 0V, VCC5/VCC25 = 1V
q
0.05
0.3
V
ISINK = 100µA, VCC3 = 1V, VCC5/VCC25 = 1V
q
0.05
0.3
V
VIH
WDI Input Threshold High
q
0.7 • VCC3
V
VIL
WDI Input Threshold Low
q
0.3 • VCC3
V
tWP
WDI Pulse Width
q
40
ns
tWT
Watchdog Time-Out Period
CWT = 1500pF
q
23
33
43
ms
WDI Leakage Current
q
±1
µA
LTC1726-5 Only
VOVR
VCC5 Reset Override Voltage (Note 6)
Override VCC5 Ability to Assert RST
VCC3 ±0.025
V
Note 4: Both VCC3 and VCC25/VCC5 can act as the supply depending on
which pin has the greatest potential.
Note 5: The output pin RST has weak internal pull-ups to VCC3 of typically
6
µA. However, external pull-up resistors may be used when faster rise
times are required or for VOH voltages greater than VCC3.
Note 6: The VCC5 reset override voltage is valid for an operating range less
than approximately 4.15V. Above this point the override is turned off and
the VCC5 pin functions normally.
ELECTRICAL CHARACTERISTICS
TYPICAL PERFOR A CE CHARACTERISTICS


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