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查询ASM1815供应商
February 2005
rev 1.4
General Description
The ASM1815 is a voltage supervisory device with low-power,
3.3V/3.0V µP Reset, active LOW, Push-Pull output. Maximum
supply current over temperature is a low 15µA (at 3.6V).
The ASM1815 generates an active LOW 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 20%. When an out-of-
tolerance condition is detected, an internal power-fail signal is
generated which forces an active LOW 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 ASM1815 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, 3.3V/3.0V µP Reset Active LOW, 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
ASM1815
V
CC
RESET
ASM1815
Microprocessor
RESET
Other low power products in this family include the ASM1810/
11/12/16/17, ASM1233D and ASM1233M.
Key Features
• Low Supply Current
•20 µA maximum (5.5 V)
•15 µA maximum (3.6 V)
• Automatically restarts a microprocessor after power failure
• 150ms reset delay after V
dition
• Active LOW 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
Block Diagram
V
V
2
CC
CC
Supply
Supply
Tolerance
Tolerance
Bias
Bias
Reference
Reference
+
+
-
-
GND
ASM1815
Delay
Delay
150ms
150ms
Typical
Typical
3
GND
1
RESET
RESET
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
ASM1815
TO-92
RESET
Pin Description
1
ASM1815-R
V
2
CC
TO-92 SOT-23
Pin # Pin #
1 1 RESET
SOT-23
ASM1815
3
GND
2
1
Pin Name Description
Active LOW reset output
3
22
3 3 GND Ground
V
CC
Power supply input
Low Power, 3.3V/3.0V µP Reset
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Notice: The information in this document is subject to change without notice
Page 3
February 2005
rev 1.4
Application Information
Operation - Power Monitor
The ASM1815 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 (LOW) for approximatley 150ms after the power supply
voltage has reached the selected tolerance. This allows the
power supply and microprocessor to stablize before RESET
is released.
(MIN)
V
CCTP
~
~
V
CC
~
RESET
Figure 1: Timing Diagram: Power-Up
~
voltage is detected, the
CC
t
R
V
(MAX)
CCTP
V
CCTP
t
RPU
V
OH
ASM1815
t
V
CCTP
F
V
(MIN)
CCTP
~
~
below 1.2V,
CC
V
t
RPD
OL
V
CC
V
(MAX)
CCTP
RESET
Figure 2: Timing Diagram: Power-Down
Output Conditions
The ASM1815 active LOW reset signal is valid as long as
V
remains below 1.2V. The RESET output on the
CC
ASM1815 uses a push-pull drive stage that can maintain a
valid output below 1.2V. To sink current with V
a resistor can be connected from the reset pin (RESET) to
Ground (see Figure 3). This configuration will give a valid
value on the RESET
both power up and down, this configuration will draw current
when the RESET
should be adequate to maintain a valid connection.
output with VCC approaching 0V. During
is in the high state. A value of 100kΩ
ASM1815
Figure 3: RESET Valid to 0V V
RESET
Low Power, 3.3V/3.0V µP Reset
Notice: The information in this document is subject to change without notice
Microprocessor
RESET
100kΩ
CC
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Page 4
February 2005
rev 1.4
Absolute Maximum Ratings
Parameter Min Max Unit
ASM1815
Voltage on V
Voltage on RESET
Operating Temperature Range -40 85 °C
Soldering Temperature (for 10 sec) 260 °C
Storage Temperature -55 125 °C
CC
-0.5 7 V
+ 0.5
-0.5
V
CC
V
ESD rating
HBM
MM
NOTE: These are stress ratings only and functional use is not implied. Exposure to absolute maximum ratings 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
Supply Voltage
Output Voltage
Output Current
Output Current
Operating Current
Operating Current
V
V
VCC Trip Point (ASM1815R-20) V
Output Capacitance
VCC Detect to RESET Low t
V
(V
V
(V
V
Note: The tF value is for reference in defining values for t
are referenced to ground
Parameter Symbol Conditions Min Typ Max Unit
Trip Point (ASM1815R-5) V
CC
Trip Point (ASM1815R-10) V
CC
Slew Rate
CC
(MAX) to V
CCTP
Slew Rate
CC
(MIN) to V
CCTP
Detect to RESET High t
CC
CCTP
CCTP
(MIN)
(MAX)
V
V
I
OH
I
OL
I
CC
I
CC
CCTP
CCTP
CCTP
C
OUT
RPD
t
t
RPU
CC
OH
F
R
1.2 5.5 V
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 open
VCC < 3.6V, RESET output open
tr = 5µs
and should not be considered for proper operation or use.
RPD
+10 mA
2.98 3.06 3.15 V
2.80 2.88 2.97 V
2.47 2.55 2.64 V
300 µs
0ns
100 150 250 ms
V
350 µA
820µA
615µA
10 pF
25µs
Low Power, 3.3V/3.0V 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
ASM1815
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, 3.3V/3.0V µP Reset
Notice: The information in this document is subject to change without notice
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February 2005
rev 1.4
ASM1815
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, 3.3V/3.0V µP Reset
Notice: The information in this document is subject to change without notice
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February 2005
rev 1.4
Family Selection Guide
ASM1815
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, 3.3V/3.0V 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 Information
ASM1815
Device Summary
RESET
Part ** Number
TIN - LEAD DEVICES
ASM1815R-5 3.06 5 150 LOW RJLL
ASM1815R-10 2.88 10 150 LOW RKLL
ASM1815R-20 2.55 20 150 LOW RLLL
LEAD FREE DEVICES
ASM1815R-5F 3.06 5 150 LOW KJLL
ASM1815R-10F 2.88 10 150 LOW KKLL
ASM1815R-20F 2.55 20 150 LOW KLLL
Part ** Number
TIN - LEAD DEVICES
ASM1815-5 3.06 5 150 LOW ASM1815-5
ASM1815-10 2.88 10 150 LOW ASM1815-10
Output
Vol tage (V)
RESET
Output
Vol tage (V)
RESET
Tolerance
(%)
RESET
Tolerance
(%)
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
ASM1815-20 2.55 20 150 LOW ASM1815-20
LEAD FREE DEVICES
ASM1815-5F 3.06 5 150 LOW ASM1815-5F
ASM1815-10F 2.88 10 150 LOW ASM1815-10F
ASM1815-20F 2.55 20 150 LOW ASM1815-20F
* *Add /T to Part Number for Tape and Reel (i.e ASM18xx-x/T)
LL- Lot Code
Low Power, 3.3V/3.0V µP Reset
Notice: The information in this document is subject to change without notice
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ASM1815
Alliance Semiconductor Corporation
2575, Augustine Drive,
Santa Clara, CA 95054
Tel: 408 - 855 - 4900
Fax: 408 - 855 - 4999
www.alsc.com
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Copyright © Alliance Semiconductor
All Rights Reserved
Part Number: ASM1815
Document Version: 1.4
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