LTC2908IDDB-C1 データシートの表示（PDF） - Linear Technology
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LTC2908IDDB-C1 Datasheet PDF : 18 Pages
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LTC2908
ELECTRICAL CHARACTERISTICS
The l denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. VCC = 5V
for the LT2908-A1, VCC = 3.3V for the LTC2908-B1 or VCC = 2.5V for the LTC2908-C1, unless otherwise noted. (Notes 2, 3)
SYMBOL
tRST
tUV
VOH
VOL
PARAMETER
Reset Time-Out Period
VX Undervoltage Detect to RST
Output Voltage High RST (Note 5)
Output Voltage Low RST
CONDITIONS
VX Less Than Reset Threshold VRTX by
More Than 1%
IRST = –1μA, VCC = 5V (LTC2908-A1)
IRST = –1μA, VCC = 3.3V (LTC2908-B1)
IRST = –1μA, VCC = 2.5V (LTC2908-C1)
VCC = 0.5V, IRST = 5μA
VCC = 1.0V, IRST = 100μA
VCC = 3.0V, IRST = 2500μA
MIN TYP MAX UNITS
l 160
200
260
ms
250
μs
l VCC – 1.5
V
l VCC – 1.0
V
l VCC – 1.0
V
l
0.01 0.15
V
l
0.01 0.15
V
l
0.10 0.30
V
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
reliabilty and lifetime.
Note 2: The greater of V1, V2 is the internal supply voltage (VCC) for the
LTC2908-A1 and the LTC2908-B1. V1 is the internal supply voltage (VCC)
for the LTC2908-C1.
Note 3: All currents into pins are positive; all voltages are referenced to
GND unless otherwise noted.
Note 4: Under typical operating conditions, most of the quiescent cur-
rent is drawn from the V1 input. When V2 exceeds V1, V2 supplies most
of the quiescent current.
Note 5: The output pin RST has an internal pull-up to VCC of typically
6μA. However, an external pull-up resistor may be used when a faster
rise time is required or for VOH voltages greater than VCC.
TYPICAL PERFORMANCE CHARACTERISTICS
Specifications are at TA = 25°C unless otherwise noted.
5V Threshold Voltage
vs Temperature
4.750
4.725
4.700
4.675
4.650
4.625
4.600
–50 –25
0 25 50
TEMPERATURE (°C)
75 100
2908 G01
3.3V Threshold Voltage
vs Temperature
3.135
3.115
3.095
3.075
3.055
3.035
–50 –25
0 25 50
TEMPERATURE (°C)
75 100
2908 G02
2.5V Threshold Voltage
vs Temperature
2.375
2.360
2.345
2.330
2.315
2.300
–50 –25
0 25 50
TEMPERATURE (°C)
75 100
2908 G03
2908fd
4
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