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| www..com November 2003 rev 1.0 ASM1233A Low Power, 3.3V, P Reset, Active LOW, Open-Drain Output * * * Embedded control systems Printers Single board computers General Description The ASM1233A is a voltage supervisor with low-power, 3.3V P Reset, with an active LOW, open-drain output. Maximum supply current over temperature is a low 15A. 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 remains active for 350ms to allow the power supply and system microprocessor to stabilize. Typical Operating Circuit VCC ASM1233A Microprocessor RESET 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 GND Key Features * * * * * * * * Low Supply Current *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 SOT-223 package Operating temperature -40C to +85C Block Diagram VCC ASM1233A 5.0k Supply Tolerance Bias + RESET Delay 350ms Typical Reference Applications * * * * Set-top boxes Cellular phones PDAs 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 GND November 2003 rev 1.0 ASM1233A Pin Configuration SOT-223 RESET GND VCC 2 4 3 ASM1233A 1 GND Pin Description Pin# 1 2 3 4 Pin Name GND RESET VCC GND Ground. Active LOW reset output. Power supply input. Ground. Description Low Power, 3.3V, P Reset, Active LOW, Open-Drain Output Notice: The information in this document is subject to change without notice 2 of 9 November 2003 rev 1.0 ASM1233A VCC VCCTP (MAX) VCCTP VCCTP (MIN) tF Application Information Operation - Power Monitor The ASM1233A 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, 3.3V, P Reset, Active LOW, Open-Drain Output Notice: The information in this document is subject to change without notice November 2003 rev 1.0 ASM1233A 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, 3.3V, P Reset, Active LOW, Open-Drain Output Notice: The information in this document is subject to change without notice 4 of 9 November 2003 rev 1.0 ASM1233A 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 VCC Trip Point (ASM1233A-3) Voltage High Trip Level ASM1233A-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 VCCTP VHTL RP COUT tRPD tF tR tRPU tr = 5s Conditions Min 1.2 Typ Max 5.5 Unit V V mA IOUT < 500 A Output = 0.4V, VCC >= 2.7V VCC < =3.6V, RESET output open VCC - 0.5V +8 VCC - 0.1V 6 2.64 2.72 15 2.8 3.14 A V V k pF s s 3.5 5.0 7.5 10 2 300 10 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, 3.3V, P Reset, Active LOW, Open-Drain Output Notice: The information in this document is subject to change without notice 5 of 9 November 2003 rev 1.0 ASM1233A Family Selection Guide Part # ASM1810 ASM1811 ASM1812 ASM1815 ASM1816 ASM1817 ASM1233D ASM1233M ASM1233A 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 2.720 RESET Time (ms) 150 150 150 150 150 150 350 350 350 Output Stage Push-Pull Open-Drain Push-Pull Push-Pull Open-Drain Push-Pull Open-Drain Open-Drain Open-Drain RESET Polarity LOW LOW HIGH LOW LOW HIGH LOW LOW LOW Low Power, 3.3V, P Reset, Active LOW, Open-Drain Output Notice: The information in this document is subject to change without notice 6 of 9 November 2003 rev 1.0 ASM1233A Package Information SOT-223 B E H S D A1 A e Q1 Q B1 e1 Q2 C Dimensions in millimeters Symbol Min A A1 B B1 C D e e1 E h s Q Q1 Q2 16 16 0.146 0.287 0.041 10 MAX 10 10 0.067 0.004 0.124 0.033 0.014 0.264 Max 0.060 0.0008 0.116 0.026 0.010 0.248 Dimensions in Inches Min 1.70 0.10 3.15 0.85 0.35 6.70 Max 1.50 0.02 2.95 0.65 0.25 6.30 0.0905 NOM 0.181 NOM 0.130 0.264 0.033 2.30 NOM 4.50 NOM 3.70 7.30 1.05 10 MAX 16 16 10 10 3.30 6.70 0.85 Low Power, 3.3V, P Reset, Active LOW, Open-Drain Output Notice: The information in this document is subject to change without notice 7 of 9 November 2003 rev 1.0 ASM1233A Ordering Information Part Number RESET Output Voltage RESET Tolerance RESET Time Open-Drain Output Stage* RESET Polarity ASM1233AZ-15 2.720 V 15% 350 ms LOW * Internal 5k resistor pull-up Low Power, 3.3V, P Reset, Active LOW, Open-Drain Output Notice: The information in this document is subject to change without notice 8 of 9 ASM1233A 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 Preliminary Information Part Number: ASM1233A 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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