LTC2903 データシートの表示（PDF） - Linear Technology
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LTC2903 Datasheet PDF : 16 Pages
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LTC2903-1
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 3.3V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
IV1
V1 Input Current (Note 4)
V1 = 3.3V (LTC2903-A1)
q
V1 = 5V (LTC2903-B1, LTC2903-C1) q
20
80
25
80
IV2
V2 Input Current (Note 4)
V2 = 2.5V (LTC2903-A1)
q
V2 = 3.3V (LTC2903-B1, LTC2903-C1) q
8
30
10
30
IV3
V3 Input Current
V3 = 1.8V (LTC2903-A1, LTC2903-C1) q
V3 = 2.5V (LTC2903-B1)
q
6
30
8
30
IV4
V4 Input Current
V4 = 0.55V (LTC2903-A1)
q
±15
V4 = 1.8V (LTC2903-B1)
q
2
4
V4 = –5.2V (LTC2903-C1)
q
–3
–6
tRST
Reset Time-Out Period
tUV
VX Undervoltage Detect to RST
VX Less Than Threshold VRTX by
More Than 1%
q 140 200 260
150
VOH
Output Voltage High RST (LTC2903-1) (Note 5) IRST(DN) = –1µA
VOL
Output Voltage Low RST (Note 6)
VCC = 0.2V, IRST = 0.1µA
VCC = 0.5V, IRST = 5µA
VCC = 1V, IRST = 200µA
VCC = 3V, IRST = 2500µA
q V2 – 1
q
5
60
q
10 150
q
25 300
q
100 300
UNITS
µA
µA
µA
µA
µA
µA
nA
µA
µA
ms
µs
V
mV
mV
mV
mV
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: All currents into pins are positive, all voltages are referenced to
GND unless otherwise noted.
Note 3: The internal supply voltage (VCC) is generated from the greater
voltage on the V1, V2 inputs.
Note 4: Under typical operating conditions, quiescent current is drawn
from the V1 input. When V2 exceeds V1, V2 supplies the quiescent
current.
Note 5: The RST output pin on the LTC2903-1 has an internal pull-up to
V2 of typically 10µA. However, for faster rise times or for VOH voltages
greater than V2, use an external pull-up resistor.
Note 6: At input voltages below 1V on V1 and V2, voltage on V3 assists
pulling down the RST output.
29031f
3
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