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| February 2005 rev 1.4 ASM1815 Low Power, 3.3V/3.0V P Reset Active LOW, Push-Pull Output Applications * * * * * * * Set-top boxes Cellular phones PDAs Energy management systems Embedded control systems Printers Single board computers General Description The ASM1815 is a voltage supervisory device with low-power, 3.3V/3.0V P Reset, active LOW, Push-Pull output. Maximum supply current over temperature is a low 15A (at 3.6V). The ASM1815 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%, 10% and 20%. When an out-oftolerance 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 150ms to allow the power supply and system microprocessor to stabilize. The ASM1815 is designed with a push-pull output stage and operates over the extended industrial temperature range. Devices are available in TO-92 and compact surface mount SOT-23 packages. Other low power products in this family include the ASM1810/ 11/12/16/17, ASM1233D and ASM1233M. Typical Operating Circuit VCC ASM1815 Microprocessor RESET RESET GND Key Features * Low Supply Current *20 A maximum (5.5 V) *15 A maximum (3.6 V) * * * * * * * * Automatically restarts a microprocessor after power failure 150ms reset delay after VCC returns to an in-tolerance condition Active LOW power-up reset Precision temperature-compensated voltage reference and comparator Eliminates external components TO-92 and compact surface mount SOT-23 package Push-Pull output for minimum current drain Operating temperature -40C to +85C Block Diagram VCC 2 Supply Tolerance Bias ASM1815 + Reference Delay 150ms Typical 1 RESET 3 GND 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 February 2005 rev 1.4 ASM1815 Pin Configuration TO-92 SOT-23 RESET 1 ASM1815-R ASM1815 3 GND VCC 2 1 2 3 Pin Description TO-92 Pin # 1 2 3 SOT-23 Pin Name Pin # 1 2 3 RESET VCC GND Active LOW reset output Power supply input Ground Description Low Power, 3.3V/3.0V P Reset Notice: The information in this document is subject to change without notice 2 of 9 February 2005 rev 1.4 ASM1815 VCC VCCTP (MAX) tF Application Information Operation - Power Monitor The ASM1815 detects out-of-tolerance power supply conditions. It resets a processor during power-up, powerdown and issues a reset to the system processor when the When an out-of-tolerance VCC voltage is detected, the RESET signal is asserted. On power-up, RESET is kept active (LOW) for approximatley 150ms 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 VCCTP VCCTP (MIN) RESET tRPD VOL Figure 2: Timing Diagram: Power-Down Output Conditions The ASM1815 active LOW reset signal is valid as long as VCC remains below 1.2V. The RESET output on the ASM1815 uses a push-pull drive stage that can maintain a VCC tRPU valid output below 1.2V. To sink current with VCC below 1.2V, a resistor can be connected from the reset pin (RESET) to Ground (see Figure 3). This configuration will give a valid value on the RESET output with VCC approaching 0V. During both power up and down, this configuration will draw current when the RESET is in the high state. A value of 100k should be adequate to maintain a valid connection. VOH RESET Figure 1: Timing Diagram: Power-Up ASM1815 Microprocessor RESET 100k RESET Figure 3: RESET Valid to 0V VCC ~ ~ 3 of 9 monitored power supply voltage is below the reset threshold. ~ ~ ~ ~ Low Power, 3.3V/3.0V P Reset Notice: The information in this document is subject to change without notice February 2005 rev 1.4 ASM1815 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 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. 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 Output Current Operating Current Operating Current VCC Trip Point (ASM1815R-5) VCC Trip Point (ASM1815R-10) VCC Trip Point (ASM1815R-20) Output Capacitance VCC Detect to RESET Low VCC Slew Rate (VCCTP (MAX) to VCCTP (MIN) VCC Slew Rate (VCCTP (MIN) to VCCTP (MAX) VCC Detect to RESET High Symbol VCC VOH IOH IOL ICC ICC VCCTP VCCTP VCCTP COUT tRPD tF tR tRPU tr = 5s 300 0 100 150 250 2 IOUT < 500 A Output = 2.4V, VCC > 2.7V Output = 0.4V, VCC > 2.7V VCC < 5.5V, RESET output open VCC < 3.6V, RESET output open 2.98 2.80 2.47 +10 8 6 3.06 2.88 2.55 20 15 3.15 2.97 2.64 10 5 Conditions Min 1.2 VCC - 0.5V VCC - 0.1V 350 Typ Max 5.5 Unit V V A mA A A V V V pF s s ns ms Note: The tF value is for reference in defining values for tRPD and should not be considered for proper operation or use. Low Power, 3.3V/3.0V P Reset Notice: The information in this document is subject to change without notice 4 of 9 February 2005 rev 1.4 ASM1815 Package Dimension Plastic SOT-23 (3-Pin) D B E H S e A C L a A1 e1 Inches Millimeters Min Max Min Max Plastic SOT-23 (3-Pin) A A1 B C D E e e1 H L a S 0.030 0.002 0.012 0.003 0.110 0.047 0.046 0.006 0.020 0.008 0.120 0.055 0.75 0.05 0.30 0.08 2.80 1.20 0.95 BSC 1.9 BSC 2.10 0.40 0 o 1.17 0.15 0.50 0.20 3.04 1.40 0.037 BSC 0.075 BSC 0.083 0.016 0 o 0.104 0.024 8 o 2.64 0.60 8 o NA NA 5 of 9 Low Power, 3.3V/3.0V P Reset Notice: The information in this document is subject to change without notice February 2005 rev 1.4 To-92 (3-Pin) ASM1815 Dimensions in Inches Min Max TO-92 A b C D E e e1 j L s 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 Dimensions in Millimeters Min Max 4.445 0.406 0.356 4.445 3.505 2.489 1.143 4.269 12.7 2.413 4.699 0.508 0.406 4.699 3.658 2.591 1.397 4.420 14.86 2.515 Low Power, 3.3V/3.0V P Reset Notice: The information in this document is subject to change without notice 6 of 9 February 2005 rev 1.4 ASM1815 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, 3.3V/3.0V P Reset Notice: The information in this document is subject to change without notice 7 of 9 February 2005 rev 1.4 ASM1815 Ordering Information Device Summary RESET Output Voltage (V) RESET Tolerance (%) RESET Time (ms) Push-Pull Output Stage SOT-23 Package RESET Polarity Package Marking Part ** Number TIN - LEAD DEVICES ASM1815R-5 ASM1815R-10 ASM1815R-20 LEAD FREE DEVICES ASM1815R-5F ASM1815R-10F ASM1815R-20F 3.06 2.88 2.55 RESET Output Voltage (V) 5 10 20 RESET Tolerance (%) 150 150 150 RESET Time (ms) Push-Pull Output Stage TO-92 Package LOW LOW LOW RESET Polarity KJLL KKLL KLLL Package Marking 3.06 2.88 2.55 5 10 20 150 150 150 LOW LOW LOW RJLL RKLL RLLL Part ** Number TIN - LEAD DEVICES ASM1815-5 ASM1815-10 ASM1815-20 LEAD FREE DEVICES ASM1815-5F ASM1815-10F ASM1815-20F 3.06 2.88 2.55 5 10 20 150 150 150 LOW LOW LOW ASM1815-5F ASM1815-10F ASM1815-20F 3.06 2.88 2.55 5 10 20 150 150 150 LOW LOW LOW ASM1815-5 ASM1815-10 ASM1815-20 * *Add /T to Part Number for Tape and Reel (i.e ASM18xx-x/T) LL- Lot Code Low Power, 3.3V/3.0V P Reset Notice: The information in this document is subject to change without notice 8 of 9 ASM1815 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: ASM1815 Document Version: 1.4 (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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