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October 2003
rev 1.0
ASM1233M
Low Power, 5V/3.0V, P Reset, Active LOW, Open-Drain Output
Applications
* * * * * * * Set-top boxes Cellular phones PDAs Energy management systems Embedded control systems Printers Single board computers
General Description
The ASM1233M is a voltage supervisor with low-power, 5V P Reset, with an active LOW, open-drain output. Maximum supply current over temperature is a low 20A. The ASM1233M 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. Tolerance level options are 5% ,and 10% for a 5V power supply. The tolerance is 15% for the 3.3V, ASM1233M. 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 remains active for 350ms to allow the power supply and system microprocessor to stabilize.
Typical Operating Circuit
VCC
ASM1233M
The ASM1233M is designed with a open-drain output stage and operates over the extended industrial temperature range. Devices are available in compact surface mount SO-8 packages and 3-lead TO-92 packages. Other low power products in this family include the ASM1810/ 11/12/15/16/17 and ASM1233D.
RESET RESET
Microprocessor
GND
Key Features
* Low Supply Current *20 A maximum (5.5 V) *15A maximum (3.6 V) * * * * * * * * Automatically restarts a microprocessor after power failure 350ms reset delay after VCC returns to an in-tolerance condition Active LOW power-up reset, 5k internal pull-up Precision temperature-compensated voltage reference and comparator Eliminates external components Low-cost TO-92 package Compact surface mount SO-8 package Operating temperature -40C to +85C
Reference Supply Tolerance Bias
Block Diagram
VCC 2
ASM1233M
5.0k 1
+
RESET Delay 150ms Typical
-
GND
4
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
October 2003
rev 1.0
ASM1233M
Pin Configuration
SO-8
ASM1233M-X
TO-92* 8 7 6 5 NC NC NC NC
ASM1233M-X
RESET VCC NC GND
1 2 3 4
1
2
3
Pin Description
Pin # Pin Name SO-8 1 2 3, 5, 6, 7 and 8 4
* See Ordering Information
Description Active LOW reset output Power supply input No Connection. Ground.
TO-92 1 2 3 RESET VCC NC GND
Low Power, 5V/3.0V, P Reset, Active LOW, Open-Drain Output
Notice: The information in this document is subject to change without notice
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October 2003
rev 1.0
ASM1233M
VCC VCCTP (MAX) VCCTP VCCTP (MIN) tF
Application Information
Operation - Power Monitor The ASM1233M detects out-of-tolerance power supply conditions. It resets a processor during power-up, powerdown and generates a reset to the system processor when threshold. When an out-of-tolerance VCC voltage is detected, 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.
tR VCCTP (MAX) VCCTP (MIN) VCCTP
RESET
tRPD
VOL Figure 2: Timing Diagram: Power-Down
VCC
tRPU
VOH
RESET
Figure 1: Timing Diagram: Power-Up
~ ~
3 of 9
the monitored power supply voltage is below the reset
~ ~ ~ ~
Low Power, 5V/3.0V, P Reset, Active LOW, Open-Drain Output
Notice: The information in this document is subject to change without notice
October 2003
rev 1.0
ASM1233M
Absolute Maximum Ratings
Parameter Voltage on VCC Voltage on RESET Operating Temperature Range Soldering Temperature (for 10 sec) Storage Temperature -55 Min -0.5 -0.5 -40 Max 7 VCC + 0.5 85 260 125 Unit V V C C C
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.
Low Power, 5V/3.0V, P Reset, Active LOW, Open-Drain Output
Notice: The information in this document is subject to change without notice
4 of 9
October 2003
rev 1.0
ASM1233M
Electrical Characteristics
Unless otherwise noted, VCC = 1.2V to 5.5V and specifications are over the operating temperature range of -40C to +85C. All voltages are referenced to ground.
Parameter Supply Voltage Output Voltage Output Current Operating Current Operating Current VCC Trip Point (ASM1233M-5) VCC Trip Point (ASM1233M-55) VCC Trip Point (ASM1233M-3) Voltage High Trip Level ASM1233M-5 ASM1233M-55 Voltage Low Trip Level ASM1233M-5 ASM1233M-55 Voltage High Trip Level ASM1233M-3 Internal Pull-up Resistor Output Capacitance VCC Detect to RESET Low VCC Slew Rate (VHTL - VLTL ) VCC Slew Rate (VLTL - VHTL) VCC Detect to RESET High
Symbol VCC VOH IOL ICC ICC VCCTP VCCTP VCCTP VHTL
Conditions
Min 1.2
Typ
Max 5.5
Unit V V mA
IOUT < 500 A Output = 0.4V, VCC >= 2.7V VCC < 5.5V, RESET output open VCC < =3.6V, RESET output open
VCC - 0.5V +8
VCC - 0.1V
8 6 4.25 4.5 2.64 4.375 4.625 2.72
20 15 4.49 4.75 2.8 4.75
A A V V V V
VLTL
4.00
V
VHTL RP COUT tRPD tF tR tRPU tr = 5s 300 2 3.5 5.0
3.14 7.5 10 10
V k pF s s
0 200 350 500
ns ms
Note: A 1k resistor maybe required in some applications for proper operation of the microprocessor reset control circuit.
Low Power, 5V/3.0V, P Reset, Active LOW, Open-Drain Output
Notice: The information in this document is subject to change without notice
5 of 9
October 2003
rev 1.0
ASM1233M
Family Selection Guide
Part # ASM1810 ASM1811 ASM1812 ASM1815 ASM1816 ASM1817 ASM1233D ASM1233M
RESET Voltage (V) 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
RESET Time (ms) 150 150 150 150 150 150 350 350
Output Stage Push-Pull Open-Drain Push-Pull Push-Pull Open-Drain Push-Pull Open-Drain Open-Drain
RESET Polarity LOW LOW HIGH LOW LOW HIGH LOW LOW
Low Power, 5V/3.0V, P Reset, Active LOW, Open-Drain Output
Notice: The information in this document is subject to change without notice
6 of 9
October 2003
rev 1.0
ASM1233M
Package Information
Plastic SO-8 (8-Pin)
A L M D J C Section A-A
TO-92 (3-Pin)
B
E H
Section A-A
D
D A1 A 0 - 8 C
F E K
e
B
L
G
I Bottom View H
Inches Min Max
Millimeters Min Max Min 1.75 0.25 0.51 0.25 1.27 A B C D E F G H I J K L M 0.175 0.170 0.500 0.016 0.095 0.045 0.45 0.085 0.130 0.014 0.093 45 Inches Max Millimeters Min Max
Plastic SO-8 (8-Pin) A A1 B C e E H L D 0.150 0.228 0.016 0.189 0.053 0.004 0.013 0.007 0.050 0.157 0.244 0.050 0.197 3.80 5.80 0.40 4.80 0.069 0.010 0.020 0.010 1.35 0.10 0.33 0.19
Plastic SO-8 (8-Pin) TO-92* (3-Pin) 0.195 0.192 0.610 0.022 0.105 0.60 0.060 0.095 0.155 0.020 0.115 60 4.45 4.32 12.70 0.406 2.41 1.14 1.14 2.16 3.30 0.35 2.36 45 3.00 4.95 4.96 15.49 0.559 2.67 1.52 1.52 2.41 3.94 0.51 2.92 60
4.00 6.20 1.27 2.00
0.118 Typical
Low Power, 5V/3.0V, P Reset, Active LOW, Open-Drain Output
Notice: The information in this document is subject to change without notice
7 of 9
October 2003
rev 1.0
ASM1233M
Ordering Information
Device Summary RESET Output Voltage (V) 4.625 4.375 2.720 4.625 4.375 2.720 RESET Tolerance (%) 5 10 15 5 10 15 RESET Time (ms) 350 350 350 350 350 350 Open-Drain Output Stage** TO-92 Package* SO-8 Package RESET Polarity LOW LOW LOW LOW LOW LOW
Part Number
ASM1233M-55 ASM1233M-5 ASM1233M-3 ASM1233MS-55 ASM1233MS-5 ASM1233MS-3
* Add /S to Part Number for straight (unformed) leads. (i.e. ASM1233xx-x/S) ** Internal 5k resistor pull-up
Low Power, 5V/3.0V, P Reset, Active LOW, Open-Drain Output
Notice: The information in this document is subject to change without notice
8 of 9
ASM1233M
Alliance Semiconductor Corporation 2575, Augustine Drive, Santa Clara, CA 95054 Tel: 408 - 855 - 4900 Fax: 408 - 855 - 4999 www.alsc.com
Copyright (c) Alliance Semiconductor All Rights Reserved Part Number: ASM1233M Document Version: 1.0
(c) 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 intellectual property rights, except as express agreed to in Alliance's Terms and Conditions of Sale (which are available from Alliance). All sales of Alliance products are made exclusively according to Alliance's Terms and Conditions of Sale. The purchase of products from Alliance does not 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 reasonably be expected to result in significant injury to the user, and the inclusion of Alliance products in such life-supporting systems implies that the manufacturer assumes all risk of such use and agrees to indemnify Alliance against all claims arising from such use.

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