LTC1985-1.8 데이터 시트보기 (PDF) - Linear Technology
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LTC1985-1.8
Linear Technology
LTC1985-1.8 Datasheet PDF : 8 Pages
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LTC1985-1.8
ABSOLUTE AXI U RATI GS
(Notes 1, 2)
VCC3, VCC18, VCCA ...................................... – 0.3V to 7V
RST .......................................... – 0.3V to (VCC3 + 0.3V)
Operating Temperature Range
(Note 3) ............................................. – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................ 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
RST 1
GND 2
VCCA 3
5 VCC3
4 VCC18
S5 PACKAGE
5-LEAD PLASTIC SOT-23
TJMAX = 125°C, θJA = 250°C/W
ORDER
PART NUMBER
LTC1985ES5-1.8
S5 PART MARKING
LTNM
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specificaitons are at TA = 25°C. VCC3 = 3V, VCC18 = 1.8V, VCCA = VCC3 unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
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 = 200µA
q 2.760
q 1.656
q 0.985
q1
q
q
q
q – 15
q 140
2.805
1.683
1.000
1
10
1
0
200
110
2.850
1.710
1.015
7
2
20
2
15
280
q
0.15
0.4
q
0.05
0.3
q
0.05
0.3
q
0.05
0.3
q 0.8VCC3
UNITS
V
V
V
V
µA
µA
µA
nA
ms
µs
V
V
V
V
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 LTC1985E is guaranteed to meet specified performance from
0°C to 70°C and is 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 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
voltage (VRTX) until RST passes through 1.5V.
2
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