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查询ASM1812供应商
February 2005
rev 1.4
General Description
The ASM1812 is a voltage supervisory device with low-power,
5V µP Reset, active HIGH, Push-Pull output. Maximum supply
current over temperature is a low 20µA.
The ASM1812 issues an active HIGH reset signal whenever
the monitored supply is out of tolerance. A precision reference
and comparator circuit monitor power supply (V
Tolerance level options are 5%, 10% and 15%. When an out-of-
tolerance condition is detected, an internal power-fail signal is
generated which forces an active HIGH reset signal. After V
returns to an in-tolerance condition, the reset signal remains
active for 150ms to allow the power supply and system
microprocessor to stabilize.
The ASM1812 is designed with a push-pull output stage and
operates over the extended industrial temperature range.
Devices are available in TO-92 and compact surface mount
SOT-23 packages.
Low Power 5V µP Reset Active HIGH, Push-Pull Output
) level.
CC
Applications
• Set-top boxes
• Cellular phones
•PDAs
• Energy management systems
• Embedded control systems
• Printers
• Single board computers
Typical Operating Circuit
CC
V
CC
ASM1812
RESET
ASM1812
Microprocessor
RESET
Other low power products in this family include the ASM1810/
11/15/16/17, ASM1233D and ASM1233M.
Key Features
• Low Supply Current
•20 µA maximum (5.5 V)
• Automatically restarts a microprocessor after power failure
• 150ms reset delay after V
dition
• Active HIGH power-up reset
• Precision temperature-compensated voltage reference and
comparator
• Eliminates external components
• TO-92 and compact surface mount SOT-23 package
• Push-Pull output for minimum current drain
• Operating temperature -40°C to +85°C
returns to an in-tolerance con-
CC
GND
Block Diagram
V
V
2
CC
CC
Supply
Supply
Tolerance
Tolerance
Bias
Bias
Reference
Reference
ASM1812
+
+
-
-
Delay
150ms
Typical
GND
1
RESET
3
Alliance Semiconductor
2575 Augustine Drive . Santa Clara, CA 95054 . Tel: 408.855.4900 . Fax: 408.855.4999 . www.alsc.com
Notice: The information in this document is subject to change without notice
Page 2
February 2005
rev 1.4
Pin Configuration
SOT-23
RESET
1
ASM1812
TO-92
ASM1812
V
2
CC
Pin Description
TO-92 SOT-23
Pin # Pin #
1 1 RESET Active HIGH reset output
22
3 3 GND Ground
ASM1812-R
3
GND
2
1
Pin Name Description
V
CC
Power supply input
3
Low Power 5V µP Reset
Notice: The information in this document is subject to change without notice
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Page 3
February 2005
rev 1.4
Application Information
ASM1812
Operation - Power Monitor
The ASM1812 detects out-of-tolerance power supply
conditions. It resets a processor during power-up, power-
down and issues a reset to the system processor when the
monitored power supply voltage is below the reset threshold.
When an out-of-tolerance V
RESET signal is asserted. On power-up, RESET is kept
active (HIGH) for approximately 150ms after the power
supply voltage has reached the selected tolerance. This
allows the power supply and microprocessor to stabilize
before RESET is released.
voltage is detected, the
CC
ASM1812
Microprocessor
RESET
RESET
V
(MIN)
CCTP
~
~
V
CC
~
~
RESET
Figure 2: Timing Diagram: Power-Up
t
R
V
(MAX)
CCTP
V
CCTP
t
RPU
V
OL
Figure 1: Typical Application
V
CC
V
(MAX)
CCTP
RESET
Figure 3: Timing Diagram: Power-Down
Low Power 5V µP Reset
V
CCTP
t
F
V
(MIN)
CCTP
~
~
t
RPD
V
OH
~
~
RESET Slews with V
CC
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Notice: The information in this document is subject to change without notice
Page 4
February 2005
rev 1.4
Absolute Maximum Ratings
Parameter Min Max Unit
ASM1812
Voltage on V
Voltage on RESET -0.5
Operating Temperature Range -40 85 °C
Soldering Temperature (for 10 sec) 260 °C
Storage Temperature -55 125 °C
CC
-0.5 7 V
V
+ 0.5
CC
V
ESD rating
HBM
MM
NOTE: These are stress ratings only and functional use is not implied. Exposure to absolute maximum rat-
ings for prolonged periods of time may affect device reliability.
2
200
KV
V
Electrical Characteristics
Unless otherwise noted, VCC = 1.2V to 5.5V and specifications are over the operating temperature range of -40°C to +85°C. All voltages are referenced
toground
Parameter Symbol Conditions Min Typ Max Unit
Supply Voltage
V
CC
1.2 5.5 V
Output Voltage
Output Current
Output Current
Operating Current
V
Trip Point (ASM1812R-5) V
CC
V
Trip Point (ASM1812R-10) V
CC
VCC Trip Point (ASM1812R-15) V
Output Capacitance
RESET Active Time
V
Detect to RESET HIGH t
CC
V
Slew Rate t
CC
V
Slew Rate t
CC
V
Detect to RESET LOW t
CC
Note: The tF value is for reference in defining values for t
V
I
OH
I
OL
I
CC
CCTP
CCTP
CCTP
C
OUT
t
RESET
RPD
RPU
OH
F
R
I
< 500 µA VCC - 0.5V VCC - 0.1V
OUT
Output = 2.4V, VCC > 2.7V
Output = 0.4V, VCC > 2.7V
VCC < 5.5V, RESET output
tr = 5µs
Low Power 5V µP Reset
350 µA
+10 mA
820µA
4.50 4.62 4.75 V
4.25 4.35 4.49 V
4.00 4.13 4.24 V
100 150 250 ms
25µs
300 µs
0ns
100 150 300 ms
and should not be considered for proper operation or use.
RPD
V
10 pF
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Notice: The information in this document is subject to change without notice
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February 2005
rev 1.4
Family Selection Guide
ASM1812
Part # RESET Voltage (V)
ASM1810 4.620, 4.370, 4.120 150 Push-Pull LOW
ASM1811 4.620, 4.350, 4.130 150 Open-Drain LOW
ASM1812 4.620, 4.350, 4.130 150 Push-Pull HIGH
ASM1815 3.060, 2.880, 2.550 150 Push-Pull LOW
ASM1816 3.060, 2.880, 2.550 150 Open-Drain LOW
ASM1817 3.060, 2.880, 2.550 150 Push-Pull HIGH
ASM1233D 4.625, 4.375, 4.125 350 Open-Drain LOW
ASM1233M 4.625, 4.375, 2.720 350 Open-Drain LOW
RESET Time
(ms)
Output Stage RESET Polarity
Low Power 5V µP Reset
Notice: The information in this document is subject to change without notice
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February 2005
rev 1.4
Package Dimension
Plastic SOT-23 (3-Pin)
D
B
E
H
ASM1812
S
A
A1
Inches Millimeters
Min Max Min Max
e
e1
Plastic SOT-23 (3-Pin)
A 0.030 0.046 0.75 1.17
A1 0.002 0.006 0.05 0.15
B 0.012 0.020 0.30 0.50
C 0.003 0.008 0.08 0.20
a
C
L
D 0.110 0.120 2.80 3.04
E 0.047 0.055 1.20 1.40
e 0.037 BSC 0.95 BSC
e1 0.075 BSC 1.9 BSC
H 0.083 0.104 2.10 2.64
L 0.016 0.024 0.40 0.60
a
SNA NA
o
0
o
8
o
0
o
8
Low Power 5V µP Reset
Notice: The information in this document is subject to change without notice
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Page 7
February 2005
rev 1.4
ASM1812
To-92 (3-Pin)
Dimensions in Inches Dimensions in Millimeters
Min Max Min Max
TO-92
A 0.175 0.185 4.445 4.699
b 0.016 0.020 0.406 0.508
C 0.014 0.016 0.356 0.406
φD 0.175 0.185 4.445 4.699
E 0.138 0.144 3.505 3.658
e 0.098 0.102 2.489 2.591
e1 0.045 0.055 1.143 1.397
j 0.168 0.174 4.269 4.420
L 0.500 0.585 12.7 14.86
s 0.095 0.099 2.413 2.515
Low Power 5V µP Reset
Notice: The information in this document is subject to change without notice
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Page 8
February 2005
rev 1.4
Ordering Codes
ASM1812
Device Summary
RESET
Part ** Number
TIN - LEAD DEVICES
ASM1812R-5 4.62 5 150 HIGH RGLL
ASM1812R-10 4.35 10 150 HIGH RHLL
ASM1812R-15 4.13 15 150 HIGH RILL
LEAD FREE DEVICES
ASM1812R-5F 4.62 5 150 HIGH KGLL
ASM1812R-10F 4.35 10 150 HIGH KHLL
ASM1812R-15F 4.13 15 150 HIGH KILL
Part ** Number
TIN - LEAD DEVICES
ASM1812-5 4.62 5 150 HIGH ASM1812-5
Output
Voltage
(V)
RESET
Output
Voltage
(V)
RESET
Tol era nce
(%)
RESET
Tol era nce
(%)
RESET
Time
(ms)
RESET
Time
(ms)
Push-Pull
Output Stage
Push-Pull
Output Stage
SOT-23
Package
TO-92
Package
RESET
Polarity
RESET
Polarity
Package
Marking
Package
Marking
ASM1812-10 4.35 10 150 HIGH ASM1812-10
ASM1812-15 4.13 15 150 HIGH ASM1812-15
LEAD FREE DEVICES
ASM1812-5F 4.62 5 150 HIGH ASM1812-5F
ASM1812-10F 4.35 10 150 HIGH ASM1812-10F
ASM1812-15F 4.13 15 150 HIGH ASM1812-15F
** Add /T to Part Number for Tape and Reel (i.e ASM18xx-x/T)
LL- Lot Code
Low Power 5V µP Reset
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Notice: The information in this document is subject to change without notice
Page 9
ASM1812
Alliance Semiconductor Corporation
2575, Augustine Drive,
Santa Clara, CA 95054
Tel: 408 - 855 - 4900
Fax: 408 - 855 - 4999
www.alsc.com
© Copyright 2003 Alliance Semiconductor Corporation. All rights reserved. Our three-point logo, our name and Intelliwatt are trademarks or
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Copyright © Alliance Semiconductor
All Rights Reserved
Part Number: ASM1812
Document Version: 1.4
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