LTC1727(Old_V) データシートの表示（PDF） - Linear Technology
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LTC1727
(Rev.:Old_V)
(Rev.:Old_V)
Linear Technology
LTC1727 Datasheet PDF : 16 Pages
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LTC1727/LTC1728
ELECTRICAL CHARACTERISTICS All except LTC1728-1.8. The q denotes specifications which apply over the
full operating temperature range, otherwise specifications are at TA = 25°C. VCC3 = 3.3V, VCC5 = 5V, VCC25 = 2.5V, VCCA = VCC3 unless
otherwise noted.
SYMBOL
tUV
VOL
PARAMETER
VCC Undervoltage Detect to RST
or COMPX
Output Voltage Low, RST, COMPX
VOH
Output Voltage High, RST, COMPX (Note 6)
LTC1727-5/LTC1728-5 Only
VOVR
VCC5 Reset Override Voltage (Note 7)
CONDITIONS
VCC5, VCC25, VCC3 or VCCA Less Than Reset
Threshold VRT by More Than 1% (Note 5)
ISINK = 2.5mA, VCC3 = 3V, VCC5/VCC25 = 0V
ISINK = 100µA, VCC3 = 1V, VCC5/VCC25 = 0V
ISINK = 100µA, VCC3 = 0V, VCC5/VCC25 = 1V
ISINK = 100µA, VCC3 = 1V, VCC5/VCC25 = 1V
ISOURCE = 1µA
Override VCC5 Ability to Assert RST
MIN TYP
110
q
0.15
q
0.05
q
0.05
q
0.05
q VCC3 – 1
MAX UNITS
µs
0.4
V
0.3
V
0.3
V
0.3
V
V
VCC3 ±0.025
V
LTC1728-1.8 The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at
TA = 25°C. VCC3 = 3V, VCC18 = 1.8V, VCCA = VCC3 unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VRT3
VRT18
VRTA
VCCOP
IVCC3
IVCC18
IVCCA
tRST
tUV
VOL
Reset Threshold VCC3
Reset Threshold VCC18
Reset Threshold VCCA
VCC3, VCC18 Operating Voltage
VCC3 Supply Current
VCC18 Supply Current
VCCA Input Current
Reset Pulse Width
VCC Undervoltage Detect to RST
Output Voltage Low, RST
VOH
Output Voltage High, RST
VCC3 Input Threshold
VCC18 Input Threshold
VCCA Input Threshold
RST in Correct Logic State
VCC18 > VCC3
VCC18 < VCC3, VCC3 = 3V (Note 4)
VCC18 < VCC3, VCC18 = 1.8V (Note 4)
VCCA = 1V
RST Low (Note 5)
VCC18, VCC3 or VCCA Less Than Reset (Note 5)
Threshold VRT by More Than 1%
ISINK = 2.5mA, VCC3 = 3V, VCC18 = 0V
ISINK = 100µA, VCC3 = 1V, VCC18 = 0V
ISINK = 100µA, VCC3 = 0V, VCC18 = 1V
ISINK = 100µA, VCC3 = 1V, VCC18 = 1V
ISOURCE = 1µA (Note 6)
q 2.760 2.805 2.850
V
q 1.656 1.683 1.710
V
q 0.985 1.000 1.015
V
q1
7
V
q
1
2
µA
q
10
20
µA
q
1
2
µA
q – 15
0
15
nA
q 140
200
280
ms
110
µs
q
0.15
0.4
V
q
0.05
0.3
V
q
0.05
0.3
V
q
0.05
0.3
V
q VCC3 – 1
V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: All voltage values are with respect to GND.
Note 3: The LTC1727E/LTC1728E are guaranteed to meet specified
performance from 0°C to 70°C and are designed, characterized and
assured to meet the extended temperature limits of – 40°C to 85°C
but are not tested at these temperatures.
Note 4: Both VCC3 and VCC5/VCC25/VCC18 can act as the supply depending
on which pin has the greatest potential.
Note 5: Measured from when input passes through the input threshold
(VRTX) until RST or COMPX passes through 1.5V.
Note 6: The output pins RST and COMPX have internal pull-ups to VCC3 of
typically 6µA. However, external pull-up resistors may be used when faster
rise times are required or for VOH voltages greater than VCC3.
Note 7: The VCC5 reset override voltage is valid for an operating range less
than approximately 4.15V. Above this point the override is turned off and
the VCC5 pin functions normally.
3
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