LTC2938 Просмотр технического описания (PDF) - Linear Technology
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LTC2938 Datasheet PDF : 20 Pages
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LTC2938/LTC2939
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, VCC = 5V unless otherwise specified. (Note 3)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
IWDI
WDI Input Current
tWP
WDI Input Pulse Width
VWDI = GND
VWDI = 0.7V
VWDI = 1.1V
VWDI = 5V
VCC = 3.3V or 5.5V
l
l –10
l 10
l
l
2
–30
μA
μA
μA
30
μA
μs
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: The greater of V1, V2 is the internal supply voltage (VCC).
Note 4: Under static no-fault conditions, V1 will necessarily supply
quiescent current. If at any time V2 is larger than V1, V2 must be capable
of supplying the quiescent current, programming (transient) current and
reference load current.
Note 5: The outputs RST and WDO have internal pull-ups to V2 of typically
6μA. However, external pull-up resistors may be used when faster rise
times are required or for VOH voltages greater than V2. For V2 configured
to monitor 1.2V, 1.5V, 1.8V and 2.5V supplies, external pull-up resistors
are required to ensure that the output voltage, high, is above the VIH input
threshold of the external circuit.
TYPICAL PERFORMANCE CHARACTERISTICS
Normalized Threshold Voltages
vs Temperature
1.015
1.010
1.005
1.000
0.995
0.990
0.985
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
29389 G01
–ADJ Threshold Voltage
vs Temperature
18
12
6
0
–6
–12
–18
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
29389 G02
VREF vs Temperature
1.228
1.222
1.216
1.210
1.204
1.198
1.192
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
29389 G03
293839ff
4
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