OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

LTC1726IS8-5#PBF

P1-P3P4-P6P7-P9P10-P12P13-P14
LTC1726
4
1726fd
For more information www.linear.com/LTC1726
Typical perForMance characTerisTics
V
CC25
Threshold Voltage
vs Temperature (LTC1726-2.5) I
VCC5
vs Temperature (LTC1726-5) I
VCC3
vs Temperature (LTC1726-5)
V
CC5
Threshold Voltage
vs Temperature (LTC1726-5)
V
CC3
Threshold Voltage
vs Temperature
V
CCA
Threshold Voltage
vs Temperature
TEMPERATURE (°C)
–60
4.600
V
CC5
THRESHOLD VOLTAGE, V
RT5
(V)
4.625
4.650
4.675
4.700
–20 20
60
100
1726 G01
4.725
4.750
–40 0
40
80
TEMPERATURE (°C)
–60
V
CC25
THRESHOLD VOLTAGE, V
RT25
(V)
0 40 100
1726 G04
2.300
2.315
2.330
2.345
2.360
2.375
–40 –20
20
60 80
TEMPERATURE (°C)
–60
3.035
CC3
RT3
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
10
I
VCC5
(µA)
11
13
14
15
20
17
–20
20
40
1726 G05
12
18
19
16
–40 0
60
80
100
V
CC5
= 5V
V
CC3
= 3.3V
TEMPERATURE (°C)
–60
V
CCA
THRESHOLD VOLTAGE, V
RTA
(V)
1.000
1.005
1.015
1.010
0 40 100
1726 G03
0.995
0.990
0.985
–40 –20
20
60 80
TEMPERATURE (°C)
–60
0.5
I
VCC3
(µA)
0.6
0.8
0.9
1.0
1.5
1.2
–20
20
40
1726 G06
0.7
1.3
1.4
1.1
–40 0
60
80
100
V
CC5
= 5V
V
CC3
= 3.3V
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 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.
Note 4: Both V
CC3
and V
CC25
/V
CC5
can act as the supply depending on
which pin has the greatest potential.
Note 5: Timing measured with respect to RST passing through 1.5V.
Note 6: The output pin RST has a weak internal pull-up to V
CC3
of typically
6µA. However, external pull-up resistors may be used when faster rise
times are required or for V
OH
voltages greater than V
CC3
.
Note 7: The V
CC5
reset override voltage is valid for an operating range less
than approximately 4.15V. Above this point the override is turned off and
the V
CC5
pin functions normally.
elecTrical characTerisTics
LTC1726
5
1726fd
For more information www.linear.com/LTC1726
Typical perForMance characTerisTics
Watchdog Time-Out Period vs
Capacitance
Reset Time-Out Period vs
Capacitance
RST Output Voltage vs
Supply Voltage (LTC1726-2.5)
V
CCA
Input Current
vs Input Voltage
Watchdog Time-Out Period
vs Temperature
Reset Pulse Width vs
Temperature
I
VCC25
vs Temperature
(LTC1726-2.5)
I
VCC3
vs Temperature
(LTC1726-2.5)
Typical Transient Duration
vs Comparator Overdrive
TEMPERATURE (°C)
–60
0.5
I
VCC25
(µA)
0.6
0.8
0.9
1.0
1.5
1.2
–20
20
40
1726 G07
0.7
1.3
1.4
1.1
–40 0
60
80
100
V
CC3
= 3.3V
V
CC25
= 2.5V
TEMPERATURE (°C)
–60
10
I
VCC3
(µA)
11
13
14
15
20
17
–20
20
40
1726 G08
12
18
19
16
–40 0
60
80
100
V
CC3
= 3.3V
V
CC25
= 2.5V
RESET COMPARATOR OVERDRIVE VOLTAGE (% OF V
CC
)
0.1
400
TYPICAL TRANSIENT DURATION (µs)
500
600
700
1 10 100
1726 G09
300
200
100
0
RESET OCCURS
ABOVE CURVE
T
A
= 25°C
TEMPERATURE (°C)
–60 –40
WATCHDOG TIME PERIOD, t
WT
(ms)
34
36
38
60 80
1726 G10
32
30
–20 0 20 40 100
28
26
40
C
WT
= 1500pF
(SILVER MICA)
INPUT VOLTAGE (V)
0.80 0.85 0.95 1.05 1.15
INPUT CURRENT (nA)
0
1.0
1.20
1726 G14
–1.0
–2.0
–0.5
–1.5
0.90
1
1.10
2.0
0.5
1.5
T
A
= 25°C
TEMPERATURE (°C)
–60
4.0
RESET PULSE WIDTH, t
RT
(ms)
4.2
4.6
4.8
5.0
6.0
5.4
–20
20
40
1726 G11
4.4
5.6
5.8
5.2
–40 0
60
80
100
C
RT
= 1500pF
(SILVER MICA)
V
CC3
(V)
0
2
1726 F13
1
1
2 3
0
3
RST OUTPUT VOLTAGE (V)
V
CC3
= V
CC25
= V
CCA
10k PULL-UP FROM V
CC3
TO RST
T
A
= 25°C
C
WT
(FARAD)
10p1p 100p 10n 1
1000
100
10
1
100m
10m
1m
100
1726 G12
1n
100n
10
WATCHDOG TIME-OUT PERIOD, t
WT
(sec)
T
A
= 25°C
C
RT
(FARAD)
10p1p 100p 10n 1
100
10
1
100m
10m
1m
100
10
1726 G15
1n
100n 10
RESET TIME-OUT PERIOD, t
RT
(sec)
T
A
= 25°C
LTC1726
6
1726fd
For more information www.linear.com/LTC1726
pin FuncTions
V
CC3
(Pin 1): 3.3V Sense Input. This pin also supplies
power to the part when the voltage on this pin is greater
than the voltage on V
CC25
/V
CC5
. Bypass this pin to ground
with a 0.1µF or larger ceramic capacitor.
V
CC5
(Pin 2): 5V Sense Input (LTC1726-5). This pin also
supplies power to the part when the voltage on this pin is
greater than the voltage on V
CC3
. Bypass this pin to ground
with a 0.1µF or larger ceramic capacitor.
V
CC25
(Pin 2): 2.5V Sense Input (LTC1726-2.5). This pin
also supplies power to the part when the voltage on this
pin is greater than the voltage on V
CC3
. Bypass this pin to
ground with a 0.1µF or larger ceramic capacitor.
V
CCA
(Pin 3): 1V Sense, High Impedance Input. If unused
it can be tied to either V
CC3
, V
CC5
or V
CC25
.
GND (Pin 4): Ground.
WDI (Pin 5): Watchdog Input. A logic input whose rising
or falling edge must occur on this pin within the selected
watchdog time-out period or a reset pulse will occur.
The watchdog time-out period is set by the value of the
capacitor that
is placed on the WT pin. The rising or falling
edge of this pin clears the voltage on the WT capacitor,
preventing a reset pulse from occurring. If the watchdog
timer is not cleared, a reset pulse will occur. The watchdog
timer is cleared during a reset and restarts when the reset
is deasserted. When disabling the watchdog function, this
pin should be connected to either V
CC3
or ground and WT
must be grounded.
RST (Pin 6): Reset Logic Output. Active low, open-drain
logic output with weak pull-up to V
CC3
. Asserted when one
or more of the supplies are below trip thresholds. After all
supplies become valid, the reset remains asserted for the
period set by the capacitor on the RT pin. The watchdog
timer can also trigger the reset whenever the watchdog
time-out period is exceeded. This pin can be pulled up
greater than V
CC3
when interfacing to 5V logic.
WT (Pin 7): Watchdog Time-Out Input. Place a capacitor
between this pin and ground to adjust the watchdog time-
out period. To determine the watchdog time-out period:
t
WT
= 21.8 • C
WT
with t
WT
in µs and C
WT
in pF. As an example, a 47nF
capacitor will generate a 1s watchdog time-out period.
The watchdog function can be disabled by connecting
this pin to ground.
RT (Pin 8): Reset Time-Out Input. Place a capacitor between
this pin and ground to adjust the reset time-out period.
To determine the reset time-out period:
t
RT
= 3.30 • C
RT
with t
RT
in µs and C
RT
in pF. As an example, a 47nF capaci-
tor will generate a 155ms reset time-out period.
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:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet