ASM1233D-L/D/M
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
rev 1.3 Low Power, 5V/3.3V, µP Reset, Active LOW, Open-Drain Output
March 2005
General Description
The ASM1233D-L/1233D/1233M are voltage supervisors with
low-power, 5/3.3V µP Reset, with an active LOW, open-drain
output. Maximum supply current over temperature is 15µA for
3.3V devices and 20µA for 5V devices.
The ASM1233D-L/1233D/1233M generates an active LOW
reset signal whenever the monitored suppl y is out of tolerance.
A precision reference and comparator circuit monitors power
supply (VCC) level. The tol erance are 5%,10% an d 15%. When
an out-of-tolerance condition is d etected, an internal power-fail
signal is generated which forces an active LOW reset signal.
After VCC returns to an in-tolerance condition, the reset signal
remains active for 350ms to allow the power supply and system
microprocessor to stabilize.
The ASM1233D-L/1233D/1233M is designed with an open-
drain output stage and operates over the extended industrial
temperature range. These devices are available in compact
SOT-223, SO-8 and TO-92 packages.
Other low power products in this family include ASM1810/11/
12/15/16/17.
Key Features
• Low Supply Curre nt
• 15µA maximum (<=3.6V), 20µA maximum (5.5V)
• Automatically restarts a microprocessor after power failure
• 350ms reset delay after VCC returns to an in-tolerance con-
dition
• Active LOW power-up reset, 5kΩ internal pull-up
• Precision temperature-compensated voltage reference and
comparator
• Eliminates external components
• Low-cost SOT-223/SO-8/TO-92 packages
• Operating temperature: -40°C to +85°C
Applications
• Set-top boxes
• Cellular phones
•PDAs
• Energy management systems
• Embedded control systems
• Printers
• Single board computers
Typical Operating Circuit
Block Diagram
Microprocessor
VCC
RESET RESET
GND
ASM1233D-L/D/M
GND
Supply
Reference
Delay
350ms
Typical
Tolerance
Bias
+
-
ASM1233D-L,ASM1233D,ASM1233M
V
CC
RESET
Delay
Typical
+
-
5.0k
Ω
ASM1233D-L/D/M
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Notice: The information in this document is subject to change without notice
Low Power, 5V/3.3V, µP Reset, Active LOW, Open-Drain Output
rev 1.3
March 2005
Pin Configuration
Pin Description
Pin#
Pin Name Description
TO-92
ASM1233D-L
ASM1233D
TO-92
ASM1233M SO-8 SOT-223
1 3 4 1,4 GND Ground.
2 1 1 2 RESET Active LOW reset output.
3223
VCC Power supply input.
- - 3,5,6,7&8 - NC No connection
ASM1233D-L
SOT-223
1
2
3
4
GND
RESET
VCC
GND
RESET
VCC
ASM1233M
SO-8
GND
1
2
3
45
6
7
8
NC
NC
NC
NC
NC
ASM1233D
123
TO-92
ASM1233D-L
ASM1233D
ASM1233M
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Notice: The information in this document is subject to change without notice
Low Power, 5V/3.3V, µP Reset, Active LOW, Open-Drain Output
ASM1233D-L/D/M
rev 1.3
March 2005
Application Information
Operation - Power Monitor
The ASM1233D-L/1233D/1233M detects out-of-tolerance
power supply conditions. It resets a processor during power-
up, power-down and generates a reset to the system
processor when the monitored power supply voltage is below
the reset threshold. When an out-of-tolerance VCC voltage is
detected, the RESET signal is asserted. On power-up,
RESET is kept active (LOW) for approximately 350ms after
the power supply voltage has reached the selected tolerance.
This allows the power supply and microprocessor to stabilize
before RESET is released.
~
~
tRPU
VLTL
~
~
VOH
VCCTP
VHTL
tR
VCC
RESET
Figure 1: Timing Diagram: Power-Up
~
~
VLTL
VCCTP
VHTL
tF
VCC
tRPD
VOL
RESET
Figure 2: Timing Diagram: Power-Down
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Notice: The information in this document is subject to change without notice
Low Power, 5V/3.3V, µP Reset, Active LOW, Open-Drain Output
rev 1.3
March 2005
Absolute Maximum Ratings
Parameter Min Max Unit
Voltage on VCC -0.5 7 V
Voltage on RESET -0.5 VCC + 0.5 V
Operating Temperature Range -40 85 °C
Soldering Temperatu re (for 10 sec) 260 °C
Storage Te mperature -55 125 °C
ESD rating HBM
MM 2
200 KV
V
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.
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Notice: The information in this document is subject to change without notice
Low Power, 5V/3.3V, µP Reset, Active LOW, Open-Drain Output
rev 1.3
March 2005
Electrical Characteristics
Unless otherwise noted, VCC = 5V+10% and specifications are over the operating temperature range of -40°C to +85°C.
All voltages are referenced to ground.
Parameter Symbol Conditions Min Typ Max Unit
Supply Voltage VCC 1.2 5.5 V
Output Voltage VOL RESET asserted - - 0.4 V
VOH IOUT < 500 µA VCC-0.5V VCC-0.1V
Output Current IOL Output = 0.4V 8 mA
Operating Current ICC VCC < 5.5V, RESET output open 820
µA
VCC < =3.6V, RESET output open 615
VCC Trip Point VCCTP
ASM1233D-LZ-5 2.98 3.06 3.15
V
ASM1233D-LZ-10 2.8 2.88 2.97
ASM1233D-LZ-15 2.64 2.72 2.8
ASM1233DZ-5 4.5 4.625 4.74
ASM1233DZ-10 4.25 4.375 4.49
ASM1233DZ-15 4.0 4.125 4.24
ASM1233M-5 4.25 4.375 4.49
ASM1233M-55 4.5 4.625 4.75
ASM1233M-3 2.64 2.72 2.8
Voltage High Trip Level VHTL
ASM1233D, ASM1233MS-5,
ASM1233MS-55 4.75
V
ASM1233MS-3 3.14
ASM1233D-L 3.06
Voltage Low Trip Level VLTL
ASM1233D, ASM1233MS-5,
ASM1233MS-55 4.00 V
ASM1233MS-3 2.48
ASM1233D-L 2.3
Internal Pull-up Resistor RP3.5 5.0 7.5 kΩ
Output Capacitance COUT 10 pF
VCC Detect to RESET Low tRPD 210µs
VCC Detect to RESET High tRPU ASM1233D-L, ASM1233M 200 350 500 ms
ASM1233D 250 350 450
VCC Slew Rate
(VHTL - VLTL)tF300 µs
VCC Slew Rate
(VLTL - VHTL)tR0ns
Note: A 1kΩ resistor maybe required in some applications for proper operation of the microprocessor reset control circuit.
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Notice: The information in this document is subject to change without notice
Low Power, 5V/3.3V, µP Reset, Active LOW, Open-Drain Output
rev 1.3
March 2005
Family Selection Guide
Part # RESET Voltage (V) RESET Time
(ms) Output Stage RESET Polarity
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
ASM1233D-L 3.06, 2.880, 2.720 350 Open-Drain LOW
ASM1233D-L/D/M
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Notice: The information in this document is subject to change without notice
Low Power, 5V/3.3V, µP Reset, Active LOW, Open-Drain Output
rev 1.3
March 2005
Package Information
SOT-223
Symbol Dimensions in Inches Dimensions in millimeters
Min Max Min Max
A 0.061 0.071 1.55 1.80
A1 0.0008 0.004 0.02 0.10
B 0.024 0.031 0.60 0.80
B1 0.114 0.122 2.90 3.10
C 0.009 0.013 0.24 0.32
D 0.248 0.264 6.30 6.70
E 0.130 0.146 3.30 3.70
e 0.090BSC 2.30 BSC
e1 0.181 BSC 4.60 BSC
H 0.264 0.287 6.70 7.30
L 0.036 MIN 0.91 MIN
L2 0.0024 MIN 0.06 BSC
α0° 6° 0° 6°
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Notice: The information in this document is subject to change without notice
Low Power, 5V/3.3V, µP Reset, Active LOW, Open-Drain Output
rev 1.3
March 2005
Plastic SO-8 (8-Pin)
Dimensions in Inches Dimensions in Millimeters
Min Max Min Max
Plastic SO-8 (8-Pin)
A 0.053 0.069 1.35 1.75
A1 0.004 0.010 0.10 0.25
A2 0.049 0.059 1.25 1.50
B 0.012 0.020 0.31 0.51
C 0.007 0.010 0.18 0.25
D 0.193 BSC 4.90 BSC
E 0.154 BSC 3.91 BSC
e 0.050 BSC 1.27 BSC
H 0.236 BSC 6.00 BSC
L 0.016 0.050 0.41 1.27
θ0° 8° 0° 8°
D
EH
D
A1
A2
A
θ
L
C
B
e
ASM1233D-L/D/M
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Notice: The information in this document is subject to change without notice
Low Power, 5V/3.3V, µP Reset, Active LOW, Open-Drain Output
rev 1.3
March 2005
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
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Notice: The information in this document is subject to change without notice
Low Power, 5V/3.3V, µP Reset, Active LOW, Open-Drain Output
rev 1.3
March 2005
Ordering Information
Part Number** RESET
Output
Voltage
RESET
Tolerance RESET
Time
Open
Drain
Output
Stage*
RESET
Polarity Package Package Ma rking
TIN - LEAD DEVICES
ASM1233D-L-5 3.06 5% 350 ms LOW 3L TO-92 ASM1233D-L-5
ASM1233D-L-10 2.88 10% 350 ms LOW 3L TO-92 ASM1233D-L-10
ASM1233D-L-15 2.72 15% 350 ms LOW 3L TO-92 ASM1233D-L-15
ASM1233D-LZ-5 3.06 5% 350 ms LOW 4L SOT-223 RVLL
ASM1233D-LZ-10 2.88 10% 350 ms LOW 4L SOT-2 23 RWLL
ASM1233D-LZ-15 2.72 15% 350 ms LOW 4L SOT-2 23 RXLL
ASM1233D-5 4.625 5% 350 ms LOW 3L TO-92 ASM1233D-5
ASM1233D-10 4.375 10% 350 ms LOW 3L TO-92 ASM1233D-10
ASM1233D-15 4.125 15% 350 ms LOW 3L TO-92 ASM1233D-15
ASM1233DZ-5 4.625 5% 350 ms LOW 4L SOT-2 23 RSLL
ASM1233DZ-10 4.375 10% 350 ms LOW 4L SOT-223 RTLL
ASM1233DZ-15 4.125 15% 350 ms LOW 4L SOT-223 RULL
ASM1233M-55 4.625 5% 350 ms LOW 3L TO-92 ASM1233M-55
ASM1233M-5 4.375 10% 350 ms LOW 3L TO-92 ASM1233M-5
ASM1233M-3 2.72 15% 350 ms LOW 3L TO-92 ASM1233M-3
ASM1233MS-55 4.625 5% 350 ms LOW 8L SOIC ASM1233MS-55
ASM1233MS-5 4.38 10% 350 ms LOW 8L SOIC ASM1233MS-5
ASM1233MS-3 2.72 15% 350 ms LOW 8L SOIC ASM1233MS-3
LEAD FREE DEVICES
ASM1233D-L-5F 3.06 5% 350 ms LOW 3L TO-92 ASM1233D-L-5F
ASM1233D-L-10F 2.88 10% 350 ms LOW 3L TO-92 ASM1233D-L-10F
ASM1233D-L-15F 2.72 15% 350 ms LOW 3L TO-92 ASM1233D-L-15F
ASM1233D-LZ-5F 3.06 5% 350 ms LOW 4L SOT-223 KVLL
ASM1233D-LZ-10F 2.88 10% 350 ms LOW 4L SOT-223 KWLL
ASM1233D-LZ-15F 2.72 15% 350 ms LOW 4L SOT-223 KXLL
ASM1233D-5F 4.625 5% 350 ms LOW 3L TO-92 ASM1233D-5F
ASM1233D-10F 4.375 10% 350 ms LOW 3L TO-92 ASM1233D-10F
ASM1233D-15F 4.125 15% 350 ms LOW 3L TO-92 ASM1233D-15F
ASM1233DZ-5F 4.625 5% 350 ms LOW 4L SOT-223 KSLL
ASM1233DZ-10F 4.375 10% 350 ms LOW 4L SOT-223 KTLL
ASM1233DZ-15F 4.125 15% 350 ms LOW 4L SOT-223 KULL
ASM1233M-5F 4.375 5% 350 ms LOW 3L TO-92 ASM1233M-5F
ASM1233M-55F 4.625 10% 350 ms LOW 3L TO-92 ASM1233M-55F
ASM1233M-3F 2.72 15% 350 ms LOW 3L TO-92 ASM1233M-3F
ASM1233MS-5F 4.38 5% 350 ms LOW 8L SOIC ASM1233MS-5F
ASM1233MS-55F 4.625 10% 350 ms LOW 8L SOIC ASM1233MS-55F
ASM1233MS-3F 2.72 15% 350 ms LOW 8L SOIC ASM1233MS-3F
Alliance Semiconductor Corporation
2575, Augustine Drive,
Santa Clara, CA 95054
Tel: 408 - 855 - 4900
Fax: 408 - 855 - 4999
www.alsc.com
Copyright © Alliance Semiconductor
All Rights Reserved
Part Number: ASM1233D-L/D/M
Document Version: 1.3
© Copyright 2003 Alliance Semiconductor Corporation. All rights reserved. Our three-point logo, our name and Intelliwatt are trademarks or
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ASM1233D-L/D/M
