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November 2003  
ASM1233A  
rev 1.0  
Low Power, 3.3V, µP Reset, Active LOW, Open-Drain Output  
•
•
•
Embedded control systems  
Printers  
General Description  
The ASM1233A is a voltage supervisor with low-power, 3.3V  
µP Reset, with an active LOW, open-drain output. Maximum  
supply current over temperature is a low 15µA.  
Single board computers  
Typical Operating Circuit  
The ASM1233A generates an active LOW reset signal  
whenever the monitored supply is out of tolerance. A precision  
reference and comparator circuit monitor power supply (VCC  
)
level. The tolerance is 15% for the 3.3V, ASM1233A. When an  
out-of-tolerance condition is detected, 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  
VCC  
ASM1233A  
remains active for 350ms to allow the power supply and system  
microprocessor to stabilize.  
Microprocessor  
RESET  
GND  
RESET  
The ASM1233A is designed with a open-drain output stage and  
operates over the extended industrial temperature range.  
Devices are available in compact SOT-223 packages.  
Other low power products in this family include the ASM1810/  
11/12/15/16/17, ASM1233D, and ASM1233M  
Block Diagram  
Key Features  
•
Low Supply Current  
VCC  
•15µA maximum (3.6 V)  
•
•
Automatically restarts a microprocessor after power failure  
350ms reset delay after VCC returns to an in-tolerance con-  
ASM1233A  
dition  
5.0kΩ  
•
•
Active LOW power-up reset, 5kΩ internal pull-up  
Precision temperature-compensated voltage reference and  
comparator  
Supply  
Tolerance  
Bias  
RESET  
•
•
•
Eliminates external components  
Low-cost SOT-223 package  
Delay  
350ms  
Typical  
+
-
Operating temperature -40°C to +85°C  
Reference  
Applications  
•
•
•
•
Set-top boxes  
Cellular phones  
PDAs  
GND  
Energy management systems  
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  
November 2003  
ASM1233A  
rev 1.0  
Pin Configuration  
SOT-223  
2
4
3
RESET  
GND  
VCC  
1
GND  
Pin Description  
Pin#  
Pin Name  
Description  
1
2
3
4
GND  
RESET  
VCC  
Ground.  
Active LOW reset output.  
Power supply input.  
Ground.  
GND  
2 of 9  
Low Power, 3.3V, µP Reset, Active LOW, Open-Drain Output  
Notice: The information in this document is subject to change without notice  
November 2003  
ASM1233A  
rev 1.0  
tF  
VCC  
Application Information  
VCCTP (MAX)  
VCCTP  
Operation - Power Monitor  
The ASM1233A 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,  
VCCTP (MIN)  
t
RESET  
RPD  
the RESET signal is asserted. On power-up, RESET is kept  
active (LOW) for approximatley 350ms after the power supply  
voltage has reached the selected tolerance. This allows the  
power supply and microprocessor to stablize before RESET  
is released.  
V
OL  
tR  
VCCTP (MAX)  
Figure 2: Timing Diagram: Power-Down  
VCCTP  
VCCTP (MIN)  
t
RPU  
VCC  
V
OH  
RESET  
Figure 1: Timing Diagram: Power-Up  
3 of 9  
Low Power, 3.3V, µP Reset, Active LOW, Open-Drain Output  
Notice: The information in this document is subject to change without notice  
November 2003  
ASM1233A  
rev 1.0  
Absolute Maximum Ratings  
Parameter  
Min  
Max  
Unit  
Voltage on VCC  
-0.5  
-0.5  
-40  
7
VCC + 0.5  
85  
V
V
Voltage on RESET  
Operating Temperature Range  
Soldering Temperature (for 10 sec)  
Storage Temperature  
°C  
°C  
°C  
260  
-55  
125  
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.  
4 of 9  
Low Power, 3.3V, µP Reset, Active LOW, Open-Drain Output  
Notice: The information in this document is subject to change without notice  
November 2003  
ASM1233A  
rev 1.0  
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 to ground.  
Parameter  
Supply Voltage  
Symbol  
VCC  
Conditions  
Min  
Typ  
Max  
Unit  
V
1.2  
5.5  
VOH  
IOUT < 500 µA  
VCC - 0.5V  
VCC - 0.1V  
Output Voltage  
Output Current  
V
IOL  
Output = 0.4V, VCC >= 2.7V  
+8  
mA  
VCC < =3.6V, RESET output  
open  
ICC  
Operating Current  
6
15  
2.8  
µA  
V
VCC Trip Point (ASM1233A-3)  
VCCTP  
VHTL  
2.64  
3.5  
2.72  
Voltage High Trip Level  
ASM1233A-3  
3.14  
V
RP  
Internal Pull-up Resistor  
Output Capacitance  
5.0  
2
7.5  
10  
10  
kΩ  
pF  
µs  
COUT  
tRPD  
VCC Detect to RESET Low  
V
CC Slew Rate  
tF  
300  
µs  
(VHTL - VLTL  
)
VCC Slew Rate  
(VLTL - VHTL  
tR  
0
ns  
)
VCC Detect to RESET High  
tRPU  
tr = 5µs  
200  
350  
500  
ms  
Note: A 1kΩ resistor maybe required in some applications for proper operation of the microprocessor reset control circuit.  
5 of 9  
Low Power, 3.3V, µP Reset, Active LOW, Open-Drain Output  
Notice: The information in this document is subject to change without notice  
November 2003  
ASM1233A  
rev 1.0  
Family Selection Guide  
RESET Time  
(ms)  
Part #  
RESET Voltage (V)  
Output Stage  
RESET Polarity  
ASM1810  
ASM1811  
ASM1812  
ASM1815  
ASM1816  
ASM1817  
ASM1233D  
ASM1233M  
ASM1233A  
4.620, 4.370, 4.120  
4.620, 4.350, 4.130  
4.620, 4.350, 4.130  
3.060, 2.880, 2.550  
3.060, 2.880, 2.550  
3.060, 2.880, 2.550  
4.625, 4.375, 4.125  
4.625, 4.375, 2.720  
2.720  
150  
150  
150  
150  
150  
150  
350  
350  
350  
Push-Pull  
Open-Drain  
Push-Pull  
LOW  
LOW  
HIGH  
LOW  
LOW  
HIGH  
LOW  
LOW  
LOW  
Push-Pull  
Open-Drain  
Push-Pull  
Open-Drain  
Open-Drain  
Open-Drain  
6 of 9  
Low Power, 3.3V, µP Reset, Active LOW, Open-Drain Output  
Notice: The information in this document is subject to change without notice  
November 2003  
ASM1233A  
rev 1.0  
Package Information  
SOT-223  
B
H
E
e
S
Q1  
D
A1  
A
C
Q
Q2  
B1  
e1  
Dimensions in millimeters  
Dimensions in Inches  
Symbol  
Min  
Max  
Min  
Max  
A
A1  
B
0.067  
0.004  
0.124  
0.033  
0.014  
0.264  
0.060  
0.0008  
0.116  
0.026  
0.010  
0.248  
1.70  
0.10  
3.15  
0.85  
0.35  
6.70  
1.50  
0.02  
2.95  
0.65  
0.25  
6.30  
B1  
C
D
e
0.0905 NOM  
0.181 NOM  
2.30 NOM  
4.50 NOM  
e1  
E
0.146  
0.287  
0.041  
0.130  
0.264  
0.033  
3.70  
7.30  
1.05  
3.30  
6.70  
0.85  
h
s
Q
10 ° MAX  
10 ° MAX  
Q1  
Q2  
16°  
16°  
10°  
10°  
16°  
16°  
10°  
10°  
7 of 9  
Low Power, 3.3V, µP Reset, Active LOW, Open-Drain Output  
Notice: The information in this document is subject to change without notice  
November 2003  
ASM1233A  
rev 1.0  
Ordering Information  
Open-Drain  
Output Stage*  
Part Number  
RESET Output Voltage  
RESET Tolerance  
RESET Time  
RESET Polarity  
ASM1233AZ-15  
2.720 V  
15%  
350 ms  
‹
LOW  
* Internal 5kΩ resistor pull-up  
8 of 9  
Low Power, 3.3V, µP Reset, Active LOW, Open-Drain Output  
Notice: The information in this document is subject to change without notice  
ASM1233A  
Copyright © Alliance Semiconductor  
All Rights Reserved  
Preliminary Information  
Part Number: ASM1233A  
Document Version: 1.0  
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  
registered trademarks of Alliance. All other brand and product names may be the trademarks of their respective companies. Alliance reserves the  
right to make changes to this document and its products at any time without notice. Alliance assumes no responsibility for any errors that may  
appear in this document. The data contained herein represents Alliance's best data and/or estimates at the time of issuance. Alliance reserves the  
right to change or correct this data at any time, without notice. If the product described herein is under development, significant changes to these  
specifications are possible. The information in this product data sheet is intended to be general descriptive information for potential customers and  
users, and is not intended to operate as, or provide, any guarantee or warrantee to any user or customer. Alliance does not assume any responsibility  
or liability arising out of the application or use of any product described herein, and disclaims any express or implied warranties related to the sale  
and/or use of Alliance products including liability or warranties related to fitness for a particular purpose, merchantability, or infringement of any  
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convey a license under any patent rights, copyrights; mask works rights, trademarks, or any other intellectual property rights of Alliance or third  
parties. Alliance does not authorize its products for use as critical components in life-supporting systems where a malfunction or failure may  
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the manufacturer assumes all risk of such use and agrees to indemnify Alliance against all claims arising from such use.