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LTC1326 Datasheet(PDF) 5 Page - Linear Technology

Part # LTC1326
Description  Low Voltage Supervisorwith 27 Selectable Thresholds and Watchdog Timer
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1326 Datasheet(HTML) 5 Page - Linear Technology

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LTC2917/LTC2918
5
29178f
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Reset Output (⎯R⎯S⎯T)
tRST(INT)
Internal Reset Timeout Period
VRT = VCC
150
200
260
ms
tRST(EXT)
Adjustable Reset Timeout Period
CRT = 2.2nF
16
20
25
ms
tUV
VM Undervoltage Detect to ⎯R⎯S⎯T
Asserted
VM Less Than Reset Threshold
VMTX by More Than 5%
10
80
150
μs
VOL
Output Voltage Low ⎯R⎯S⎯TVCC = 3.3V, IRST = 2.5mA
VCC = 1V, IRST = 100μA
VCC = 0.8V, IRST = 15μA
0.15
0.15
0.05
0.4
0.3
0.2
V
V
V
IOH(RST)
⎯R⎯S⎯T Output Voltage High Leakage
⎯R⎯S⎯T = VCC
±1
μA
Watchdog Timer Control (WT)
IWT(UP)
WT Pull Up Current
VWT = 0.25V
–2
–3
–4
μA
IWT(DOWN)
WT Pull Down Current
VWT = 1.1V
234
μA
VWT(INT, LH)
WT Internal Timer Threshold
VWT Rising, Referenced to VCC
–100
–160
–300
mV
IWT(INT)
Internal WT VCC Detect Current
VWT = VCC
18
μA
IWT(DIS)
Watchdog Disable Hold Current
VWT = 0V
–3.5
μA
Watchdog Input (WDI)
tWDU(INT)
Internal Watchdog Upper Boundary
VWT = VCC
1.3
1.6
2
s
tWDL(INT)
Internal Watchdog Lower Boundary
(Note 5)
B Versions, VWT = VCC
37.5
50
62.5
ms
tWDU(EXT)
External Watchdog Upper Boundary
CWT = 2.2nF
130
160
200
ms
tWDL(EXT)
External Watchdog Lower Boundary
(Note 5)
B Versions, CWT = 2.2nF
tWDU(EXT)/32
ms
VIL(WDI)
Input Low Voltage
0.4
V
VIH(WDI)
Input High Voltage
1.1
V
tPW(WDI)
Input Pulsewidth
400
ns
WDI Leakage Current
±1
μA
Manual Reset Input (LTC2918)
VIL(MR)
Input Low Voltage
0.2 • VCC
V
VIH(MR)
Input High Voltage
0.8 • VCC
V
RPU
Pull Up Resistance
50
100
150
tPW(MR)
Pulsewidth
250
ns
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 currents into pins are positive; all voltages are referenced to
GND unless otherwise noted.
Note 3: VCC maximum pin voltage is limited by input current. Since the
VCC pin has an internal 6.2V shunt regulator, a low impedance supply
which exceeds 5.7V may exceed the rated terminal current. Operation
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 2.5V, unless otherwise noted. (Note 2)
from higher voltage supplies requires a series dropping resistor. See
Applications Information.
Note 4: Input impedance is dependent on the configuration of the SEL
pins.
Note 5: In the LTC2917-B/LTC2918-B, edges must occur on WDI with a
period between the lower and upper boundary or ⎯R⎯S⎯T is invoked. For the
LTC2917-A/LTC2918-A, the edges must simply occur before the upper
boundary. See Applications Information.


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