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November 2006  
rev 1.4  
ASM1233D-L/D/M  
Low Power, 5V/3.3V, µP Reset, Active LOW, Open-Drain Output  
General Description  
Applications  
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.  
•
•
•
•
•
•
•
Set-top boxes  
Cellular phones  
PDAs  
Energy management systems  
Embedded control systems  
Printers  
The ASM1233D-L/1233D/1233M generates an active LOW  
reset signal whenever the monitored supply is out of tolerance.  
A precision reference and comparator circuit monitors power  
supply (VCC) level. The tolerance are 5%,10% and 15%. When  
Single board computers  
Typical Operating Circuit  
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  
remains active for 350ms to allow the power supply and system  
microprocessor to stabilize.  
Microprocessor  
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.  
RESET  
GND  
RESET  
Other low power products in this family include ASM1810/11/  
12/15/16/17.  
Block Diagram  
Key Features  
V
CC  
•
Low Supply Current  
ASM1233D-L,ASM1233D,ASM1233M  
• 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-  
•
•
5.0kΩ  
Supply  
dition  
Tolerance  
•
•
Active LOW power-up reset, 5kΩ internal pull-up  
Precision temperature-compensated voltage reference and  
comparator  
Bias  
RESET  
Delay  
350ms  
Typical  
+
-
•
•
•
Eliminates external components  
Low-cost SOT-223/SO-8/TO-92 packages  
Operating temperature: -40°C to +85°C  
Reference  
GND  
PulseCore Semiconductor Corporation  
1715 S. Bascom Ave Sutie 200, Campbell, CA95008 . Tel: 408-879-9077 . Fax: 408-.879-9018 . www.pulsecoresemi.com  
Notice: The information in this document is subject to change without notice  
November 2006  
rev 1.4  
ASM1233D-L/D/M  
Pin Configuration  
SOT-223  
SO-8  
TO-92  
RESET  
VCC  
8
1
2
NC  
NC  
ASM1233D-L  
ASM1233D  
ASM1233M  
2
4
3
RESET  
7
6
GND  
VCC  
1
GND  
3
4
NC  
NC  
NC  
5
GND  
2
1
3
Pin Description  
Pin#  
TO-92  
ASM1233D-L  
ASM1233D  
Pin Name  
Description  
TO-92  
ASM1233M  
SO-8  
SOT-223  
1
2
3
-
3
1
2
-
4
1,4  
2
GND  
RESET  
VCC  
Ground.  
1
2
Active LOW reset output.  
Power supply input.  
No connection  
3
3,5,6,7&8  
-
NC  
2 of 11  
Low Power, 5V/3.3V, µP Reset, Active LOW, Open-Drain Output  
Notice: The information in this document is subject to change without notice  
November 2006  
rev 1.4  
ASM1233D-L/D/M  
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  
tF  
VCC  
VHTL  
VCCTP  
VLTL  
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.  
t
RESET  
RPD  
V
OL  
tR  
Figure 2: Timing Diagram: Power-Down  
VHTL  
VCCTP  
VLTL  
t
RPU  
VCC  
V
OH  
RESET  
Figure 1: Timing Diagram: Power-Up  
3 of 11  
Low Power, 5V/3.3V, µP Reset, Active LOW, Open-Drain Output  
Notice: The information in this document is subject to change without notice  
November 2006  
rev 1.4  
ASM1233D-L/D/M  
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  
ESD rating  
°C  
°C  
°C  
260  
-55  
125  
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.  
4 of 11  
Low Power, 5V/3.3V, µP Reset, Active LOW, Open-Drain Output  
Notice: The information in this document is subject to change without notice  
November 2006  
rev 1.4  
ASM1233D-L/D/M  
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  
Supply Voltage  
Symbol  
VCC  
Conditions  
Min  
Typ  
Max Unit  
1.2  
5.5  
0.4  
V
VOL  
RESET asserted  
-
-
Output Voltage  
Output Current  
V
VOH  
IOUT < 500 µA  
VCC-0.5V  
VCC-0.1V  
IOL  
Output = 0.4V  
8
mA  
VCC < 5.5V, RESET output open  
8
6
20  
15  
ICC  
Operating Current  
µA  
VCC < =3.6V, RESET output open  
ASM1233D-LZ-5  
ASM1233D-LZ-10  
ASM1233D-LZ-15  
ASM1233DZ-5  
ASM1233DZ-10  
ASM1233DZ-15  
ASM1233M-5  
2.98  
2.8  
2.64  
4.5  
4.25  
4.0  
4.25  
4.5  
3.06  
2.88  
2.72  
4.625  
4.375  
4.125  
4.375  
4.625  
2.72  
3.15  
2.97  
2.8  
4.74  
4.49  
4.24  
4.49  
4.75  
2.8  
VCC Trip Point  
VCCTP  
V
ASM1233M-55  
ASM1233M-3  
2.64  
ASM1233D, ASM1233MS-5,  
ASM1233MS-55  
ASM1233MS-3  
ASM1233D-L  
ASM1233D, ASM1233MS-5,  
ASM1233MS-55  
ASM1233MS-3  
ASM1233D-L  
4.75  
VHTL  
Voltage High Trip Level  
Voltage Low Trip Level  
V
V
3.14  
3.06  
4.00  
VLTL  
2.48  
2.3  
RP  
Internal Pull-up Resistor  
Output Capacitance  
3.5  
5.0  
2
7.5  
kΩ  
COUT  
10  
10  
pF  
VCC Detect to RESET Low  
tRPD  
µs  
ASM1233D-L, ASM1233M  
ASM1233D  
200  
250  
350  
350  
500  
450  
V
CC Detect to RESET High  
CC Slew Rate  
tRPU  
ms  
V
tF  
300  
0
µs  
ns  
(VHTL - VLTL  
VCC Slew Rate  
(VLTL - VHTL  
)
tR  
)
Note: A 1kΩ resistor maybe required in some applications for proper operation of the microprocessor reset control circuit.  
5 of 11  
Low Power, 5V/3.3V, µP Reset, Active LOW, Open-Drain Output  
Notice: The information in this document is subject to change without notice  
November 2006  
rev 1.4  
ASM1233D-L/D/M  
Family Selection Guide  
RESET Time  
(ms)  
Part #  
RESET Voltage (V)  
Output Stage  
RESET Polarity  
ASM1810  
ASM1811  
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  
3.06, 2.880, 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  
ASM1812  
ASM1815  
ASM1816  
ASM1817  
ASM1233D  
ASM1233M  
ASM1233D-L  
Push-Pull  
Open-Drain  
Push-Pull  
Open-Drain  
Open-Drain  
Open-Drain  
6 of 11  
Low Power, 5V/3.3V, µP Reset, Active LOW, Open-Drain Output  
Notice: The information in this document is subject to change without notice  
November 2006  
rev 1.4  
ASM1233D-L/D/M  
Package Information  
SOT-223  
Dimensions in Inches  
Dimensions in millimeters  
Symbol  
Min  
Max  
Min  
Max  
A
A1  
B
B1  
C
0.061  
0.0008  
0.024  
0.114  
0.009  
0.248  
0.130  
0.071  
0.004  
0.031  
0.122  
0.013  
0.264  
0.146  
1.55  
0.02  
0.60  
2.90  
0.24  
6.30  
3.30  
1.80  
0.10  
0.80  
3.10  
0.32  
6.70  
3.70  
D
E
e
e1  
H
L
L2  
α
0.090BSC  
0.181 BSC  
2.30 BSC  
4.60 BSC  
0.264  
0°  
0.287  
6°  
6.70  
0°  
7.30  
6°  
0.036 MIN  
0.0024 MIN  
0.91 MIN  
0.06 BSC  
7 of 11  
Low Power, 5V/3.3V, µP Reset, Active LOW, Open-Drain Output  
Notice: The information in this document is subject to change without notice  
November 2006  
rev 1.4  
ASM1233D-L/D/M  
Plastic SO-8 (8-Pin)  
H
E
D
A2  
A
C
θ
e
A1  
L
B
Dimensions in Inches  
Dimensions in Millimeters  
Min  
Max  
Min  
Max  
Plastic SO-8 (8-Pin)  
A
A1  
A2  
B
0.053  
0.004  
0.049  
0.012  
0.007  
0.069  
0.010  
0.059  
0.020  
0.010  
1.35  
1.75  
0.25  
1.50  
0.51  
0.25  
0.10  
1.25  
0.31  
0.18  
C
D
E
0.193 BSC  
0.154 BSC  
0.050 BSC  
0.236 BSC  
4.90 BSC  
3.91 BSC  
1.27 BSC  
6.00 BSC  
e
H
L
0.016  
0°  
0.050  
8°  
0.41  
0°  
1.27  
8°  
θ
8 of 11  
Low Power, 5V/3.3V, µP Reset, Active LOW, Open-Drain Output  
Notice: The information in this document is subject to change without notice  
November 2006  
rev 1.4  
ASM1233D-L/D/M  
To-92 (3-Pin)  
Dimensions in Inches  
Dimensions in Millimeters  
Min  
Max  
Min  
Max  
TO-92  
A
b
0.175  
0.016  
0.014  
0.175  
0.138  
0.098  
0.045  
0.168  
0.500  
0.095  
0.185  
0.020  
0.016  
0.185  
0.144  
0.102  
0.055  
0.174  
0.585  
0.099  
4.445  
0.406  
0.356  
4.445  
3.505  
2.489  
1.143  
4.269  
12.7  
4.699  
0.508  
0.406  
4.699  
3.658  
2.591  
1.397  
4.420  
14.86  
2.515  
C
φD  
E
e
e1  
j
L
s
2.413  
9 of 11  
Low Power, 5V/3.3V, µP Reset, Active LOW, Open-Drain Output  
Notice: The information in this document is subject to change without notice  
November 2006  
rev 1.4  
ASM1233D-L/D/M  
Ordering Information  
Open  
Drain  
Output  
RESET  
Output  
Voltage  
RESET  
Tolerance  
RESET  
Time  
RESET  
Polarity  
Part Number**  
Package  
Package Marking  
TIN - LEAD DEVICES  
ASM1233D-L-5  
3.06  
2.88  
2.72  
3.06  
2.88  
2.72  
5%  
10%  
15%  
5%  
350 ms  
350 ms  
350 ms  
350 ms  
350 ms  
350 ms  
‹
‹
‹
‹
‹
‹
LOW  
LOW  
LOW  
LOW  
LOW  
LOW  
3L TO-92  
3L TO-92  
3L TO-92  
ASM1233D-L-5  
ASM1233D-L-10  
ASM1233D-L-15  
(ASM1233A-5)  
ASM1233D-L-10  
(ASM1233A-10)  
ASM1233D-L-15  
(ASM1233A-15)  
ASM1233D-LZ-5  
4L SOT-223  
4L SOT-223  
4L SOT-223  
RVLL  
RWLL  
RXLL  
(ASM1233AZ-5)  
ASM1233D-LZ-10  
10%  
(ASM1233AZ-10)  
ASM1233D-LZ-15  
15%  
(ASM1233AZ-15)  
ASM1233D-5  
4.625  
4.375  
4.125  
4.625  
4.375  
4.125  
4.625  
4.375  
2.72  
5%  
10%  
15%  
5%  
10%  
15%  
5%  
10%  
15%  
5%  
10%  
15%  
350 ms  
350 ms  
350 ms  
350 ms  
350 ms  
350 ms  
350 ms  
350 ms  
350 ms  
350 ms  
350 ms  
350 ms  
‹
‹
‹
‹
‹
‹
‹
‹
‹
‹
‹
‹
LOW  
LOW  
LOW  
LOW  
LOW  
LOW  
LOW  
LOW  
LOW  
LOW  
LOW  
LOW  
3L TO-92  
3L TO-92  
3L TO-92  
4L SOT-223  
4L SOT-223  
4L SOT-223  
3L TO-92  
3L TO-92  
3L TO-92  
8L SOIC  
ASM1233D-5  
ASM1233D-10  
ASM1233D-15  
RSLL  
ASM1233D-10  
ASM1233D-15  
ASM1233DZ-5  
ASM1233DZ-10  
ASM1233DZ-15  
ASM1233M-55  
ASM1233M-5  
RTLL  
RULL  
ASM1233M-55  
ASM1233M-5  
ASM1233M-3  
ASM1233MS-55  
ASM1233MS-5  
ASM1233MS-3  
ASM1233M-3  
ASM1233MS-55  
ASM1233MS-5  
ASM1233MS-3  
4.625  
4.38  
2.72  
8L SOIC  
8L SOIC  
LEAD FREE DEVICES  
ASM1233D-L-5F  
3.06  
2.88  
2.72  
3.06  
2.88  
5%  
10%  
15%  
5%  
10%  
15%  
5%  
10%  
15%  
5%  
10%  
15%  
5%  
350 ms  
350 ms  
350 ms  
350 ms  
350 ms  
350 ms  
350 ms  
350 ms  
350 ms  
350 ms  
350 ms  
350 ms  
350 ms  
‹
‹
‹
‹
‹
‹
‹
‹
‹
‹
‹
‹
‹
LOW  
LOW  
LOW  
LOW  
LOW  
LOW  
LOW  
LOW  
LOW  
LOW  
LOW  
LOW  
LOW  
3L TO-92  
3L TO-92  
3L TO-92  
4L SOT-223  
4L SOT-223  
4L SOT-223  
3L TO-92  
3L TO-92  
3L TO-92  
4L SOT-223  
4L SOT-223  
4L SOT-223  
3L TO-92  
ASM1233D-L-5F  
ASM1233D-L-10F  
ASM1233D-L-15F  
KVLL  
KWLL  
KXLL  
ASM1233D-5F  
ASM1233D-10F  
ASM1233D-15F  
KSLL  
ASM1233D-L-10F  
ASM1233D-L-15F  
ASM1233D-LZ-5F  
ASM1233D-LZ-10F  
ASM1233D-LZ-15F  
ASM1233D-5F  
ASM1233D-10F  
ASM1233D-15F  
ASM1233DZ-5F  
ASM1233DZ-10F  
ASM1233DZ-15F  
ASM1233M-5F  
2.72  
4.625  
4.375  
4.125  
4.625  
4.375  
4.125  
4.375  
KTLL  
KULL  
ASM1233M-5F  
10%  
15%  
5%  
10%  
15%  
ASM1233M-55F  
ASM1233M-3F  
ASM1233MS-5F  
ASM1233MS-55F  
ASM1233MS-3F  
4.625  
2.72  
4.38  
4.625  
2.72  
350 ms  
350 ms  
350 ms  
350 ms  
350 ms  
‹
‹
‹
‹
‹
LOW  
LOW  
LOW  
LOW  
LOW  
3L TO-92  
3L TO-92  
8L SOIC  
8L SOIC  
8L SOIC  
ASM1233M-55F  
ASM1233M-3F  
ASM1233MS-5F  
ASM1233MS-55F  
ASM1233MS-3F  
10 of 11  
Low Power, 5V/3.3V, µP Reset, Active LOW, Open-Drain Output  
Notice: The information in this document is subject to change without notice  
November 2006  
rev 1.4  
ASM1233D-L/D/M  
Copyright © PulseCore Semiconductor  
All Rights Reserved  
PulseCore Semiconductor Corporation  
1715 S. Bascom Ave Suite 200  
Campbell, CA 95008  
Part Number: ASM1233D-L/D/M  
Document Version: 1.4  
Tel: 408-879-9077  
Fax: 408-879-9018  
www.pulsecoresemi.com  
© Copyright 2006 PulseCore Semiconductor Corporation. All rights reserved. Our logo and name are trademarks or registered  
trademarks of PulseCore Semiconductor. All other brand and product names may be the trademarks of their respective companies.  
PulseCore reserves the right to make changes to this document and its products at any time without notice. PulseCore assumes no  
responsibility for any errors that may appear in this document. The data contained herein represents PulseCore’s best data and/or  
estimates at the time of issuance. PulseCore 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. PulseCore 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 PulseCore products including liability or warranties related to fitness for a particular purpose,  
merchantability, or infringement of any intellectual property rights, except as express agreed to in PulseCore’s Terms and  
Conditions of Sale (which are available from PulseCore). All sales of PulseCore products are made exclusively according to  
PulseCore’s Terms and Conditions of Sale. The purchase of products from PulseCore does not convey a license under any patent  
rights, copyrights; mask works rights, trademarks, or any other intellectual property rights of PulseCore or third parties. PulseCore  
does not authorize its products for use as critical components in life-supporting systems where a malfunction or failure may  
reasonably be expected to result in significant injury to the user, and the inclusion of PulseCore products in such life-supporting  
systems implies that the manufacturer assumes all risk of such use and agrees to indemnify PulseCore against all claims arising  
from such use.  
11 of 11  
Low Power, 5V/3.3V, µP Reset, Active LOW, Open-Drain Output