LTC1985-1.8 반도체 회로 부품 판매점
Micropower Precision Triple Supply Monitor with Push-Pull Reset Output in a 5-Lead SOT-23 Package
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 Linear Technology |
LTC1985-1.8
Micropower Precision
Triple Supply Monitor
with Push-Pull Reset Output
in a 5-Lead SOT-23 Package
FEATURES
s Monitors Three Inputs Simultaneously:
3V, 1.8V and Adjustable
s ±1.5% Threshold Accuracy Over Temperature
s Very Low Supply Current: 10µA Typ
s 200ms Reset Time Delay
s Power Supply Glitch Immunity
s Guaranteed RESET for VCC3 ≥ 1V or VCC18 ≥ 1V
s 3V Active-Low Push-Pull Reset Output
s 5-Lead SOT-23 Package
U
APPLICATIO S
s Desktop Computers
s Notebook Computers
s Intelligent Instruments
s Portable Battery-Powered Equipment
s Network Servers
DESCRIPTIO
The LTC®1985-1.8 is a triple supply monitor intended for
systems with multiple supply voltages. The reset output
remains low until all three supplies have been in compli-
ance for 200ms. Tight 1.5% accuracy specifications and
glitch immunity ensure reliable reset operation without
false triggering.
The RST output is guaranteed to be in the correct state for
VCC18 or VCC3 down to 1V. The LTC1985 may also be
configured to monitor any one or two VCC inputs instead
of three, depending on system requirements.
Very low (10µA typical) supply current makes the LTC1985
ideal for power conscious systems.
The LTC1985 is available in a 5-lead SOT-23 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
3V
DC/DC 1.8V
CONVERTER 2.5V
0.1µF
0.1µF
SYSTEM
LOGIC
1
5 RST
VCC3
LTC1985-1.8
4
R1 VCC18
130k
1% 3
R2 VCCA
100k
GND
1% 2
1985-1.8 TA01
1
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
q
q
q
q 0.8VCC3
0.15
0.05
0.05
0.05
0.4
0.3
0.3
0.3
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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상호 : 아이지 인터내셔날
전화번호 : 051-319-2877
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LTC1985-1.8
Micropower Precision Triple Supply Monitor with Push-Pull Reset Output in a 5-Lead SOT-23 Package - Linear Technology
