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| October 2003 rev 1.0 ASM809, ASM810 3 Pin Microcontroller Power Supply Supervisor General Description The ASM809/ASM810 are cost effective 3.0V, 3.3V and 5.0V power supply supervisor circuits optimized for low-power microprocessor (P), microcontroller (C) and digital systems. They provide a reset output during power-up, power-down and brown-out conditions. They provide excellent reliability by eliminating external components and adjustments. The ASM809/810 are improved drop-in replacements for the Maxim MAX809/810 and feature 60% lower supply current. A reset signal is issued if the power supply voltage drops below a preset reset threshold and is asserted for at least 140ms after the supply has risen above the reset threshold. The ASM809 has an active-low RESET output that is guaranteed to be in the correct logic state for VCC down to 1.1V. The ASM810 has an active-high RESET output. The reset comparator is designed to ignore fast transients on VCC. Low supply current makes the ASM809/ASM810 ideal for use in portable and battery operated equipment. The ASM809/ASM810 are available in a compact, industry standard 3-pin SOT23 package. Six voltage thresholds are available to support 3V to 5V systems: RESET THRESHOLD Suffix L M J T S R Voltage 4.63 4.38 4.00 3.08 2.93 2.63 Features: * * * * * * Monitor 5V, 3.3V and 3V supplies 140ms min. reset pulse width Active-low reset valid with 1.1V supply (ASM809) Small 3-pin SOT-23 package No external components Specified over full temperature range - -40C to 105C Applications * * * * * * Embedded controllers Portable/Battery operated systems Intelligent instruments Wireless communication systems PDAs and handheld equipment Computers Typical Operating Circuit VCC VCC VCC P RESET (RESET) GND RESET (RESET) Input 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 October 2003 rev 1.0 ASM809, ASM810 Block Diagram SOT23 GND 1 Pin Diagram VCC ASM809 (ASM810) 3 VCC + + - RESET Generator 4.63V 4.38V 4.00V 3.08V 2.93V 2.63V RESET (RESET) (RESET) RESET 2 ASM809 (ASM810) GND Pin Description Pin # ASM809 1 2 ASM810 Pin Name GND RESET Ground. RESET is asserted LOW if VCC falls below VTH and remains LOW for TRST after VCC exceeds the threshold. RESET is asserted HIGH if VCC falls below VTH and remains HIGH for TRST after VCC exceeds the threshold. Power supply input voltage (3.0V, 3.3V, 5.0V). Function 3 2 - RESET VCC Detailed Description A proper reset input enables a microprocessor / VCC 5V 0V VTH microcontroller to start in a known state. ASM809/810 assert reset to prevent code execution errors during power-up, power-down and brown-out conditions. RESET Reset Timing The reset signal is asserted- LOW for the ASM809 and HIGH for the ASM810- when the VCC supply voltage falls below the threshold trip voltage and remains asserted for 140ms minimum after the VCC has risen above the threshold. RESET 5V 0V 5V 0V TRST ASM809 ASM810 Figure 1: Reset TIming Diagram 3 Pin Microcontroller Power Supply Supervisor Notice: The information in this document is subject to change without notice 2 of 10 October 2003 rev 1.0 ASM809, ASM810 Bidirectional Reset Pin Interfacing The ASM809/810 can interface with P / C bi-directional reset pins by connecting a 4.7k resistor in series with the ASM809/810 reset output and the P/C bi-directional reset pin. Application Information Negative VCC Transients The ASM809/810 protect Ps from brownouts and low VCC. Short duration transients of 100mV amplitude and 20s or less duration typically do not cause a false RESET. Valid Reset with VCC under 1.1V When VCC is under 1.1V, to ensure logic inputs connected to the ASM809 RESET pin are in a known state, a 100k pulldown resistor is needed at RESET . The value of the resistor is not critical. A 100k pull-up resistor to VCC at RESET is needed with the ASM810. BUF Buffered RESET VCC Power supply ASM809 4.7k RESET C or P RESET Input GND VCC GND Power Supply ASM809 RESET GND 100k Bi-directional I/O Pin Figure 4: Bidirectional Reset Pin Interfacing Figure 2: RESET valid with VCC under 1.1V VCC 100k Power Supply ASM810 RESET GND Figure 3: RESET valid with VCC under 1.1V 3 Pin Microcontroller Power Supply Supervisor Notice: The information in this document is subject to change without notice 3 of 10 October 2003 rev 1.0 ASM809, ASM810 Absolute Maximum Ratings Table 1: Parameter Pin Terminal Voltage With Respect To Ground VCC RESET, RESET Input current at VCC Output current: RESET, RESET Rate of Rise at VCC Min Max Units -0.3 -0.3 6.0 VCC + 0.3 20 20 100 V V mA mA V/s Note: These are stress ratings only and the functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability. Absolute Maximum Ratings Table 2: Parameter Power Dissipation (TA = 70C) Operating temperature range Storage temperature range Lead temperature (Soldering, 10 sec) Min Max 320 Units uW C C C -40 -65 105 160 300 Note: These are stress ratings only and the functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability. 3 Pin Microcontroller Power Supply Supervisor Notice: The information in this document is subject to change without notice 4 of 10 October 2003 rev 1.0 ASM809, ASM810 Electrical Characteristics: Unless otherwise noted, VCC is over the full voltage range, TA = -40C to 105C. Typical values at TA = 25C, VCC = 5V for L/M/J devices, VCC = 3.3V for T/S devices and VCC = 3V for R devices. Symbol VCC Parameter Input Voltage Range TA = 0C to 70C Conditions Min 1.1 1.2 Typ Max 5.5 5.5 Unit V V TA = -40C to 105C TA= -40C to 85C VCC < 5.5V, L/M/J VCC < 3.6V, R/S/T VCC < 5.5V, L/M/J VCC < 3.6V, R/S/T TA = 25C L devices TA = -40C to 85C TA = 85C to 105C TA = 25C M devices TA = -40C to 85C TA = 85C to 105C TA = 25C J devices TA = -40C to 85C TA = 85C to 105C TA = 25C T devices TA = -40C to 85C TA = 85C to 105C TA = 25C S devices TA = -40C to 85C TA = 85C to 105C TA = 25C R devices TA = -40C to 85C TA = 85C to 105C TA = -40C to 85C TA = 85C to 105C TA = 85C to 105C ICC Supply Current 9 6.8 15 10 25 20 4.70 4.75 4.86 4.45 4.50 4.56 4.06 4.10 4.20 A 4.56 4.50 4.40 4.31 4.25 4.16 3.93 3.89 3.80 3.04 3.00 2.92 2.89 2.85 2.78 2.59 2.55 2.50 4.63 4.38 4.00 VTH Reset Threshold V 3.08 3.11 3.15 3.23 2.96 3.00 3.08 2.66 2.70 2.76 ppm/C s 2.93 2.63 Reset Threshold Temp Coefficient VCC to Reset Delay VCC = VTH to VTH-100mV 30 60 Notes: 1. Production testing done at TA = 25C. Over-temperature specifications guaranteed by design only, using six sigma design limits. 2. RESET output is active LOW for the ASM809 and RESET output is active HIGH for the ASM810. 3 Pin Microcontroller Power Supply Supervisor Notice: The information in this document is subject to change without notice 5 of 10 October 2003 rev 1.0 Symbol Parameter Conditions TA = -40C to 85C Reset Active Timeout Period TA = 85C to 105C VCC= VTH min., ISINK = 1.2mA, ASM809R/S/T VOL Low RESET Output Voltage (ASM809) VCC= VTH min., ISINK = 3.2mA, ASM809L/M/J VCC > 1.1V, ISINK = 50A VCC > VTH max., ISOURCE = 500A, ASM809R/ S/T VCC > VTH max., ISOURCE = 800A, ASM809L/ M/J VOL Low RESET Output Voltage (ASM810) VCC= VTH max., ISINK = 1.2mA, ASM810R/S/T VCC= VTH max., ISINK = 3.2mA, ASM810L/M/J VOH High RESET Output Voltage (ASM810) Active Reset Timeout Period 1.8V < VCC < VTH min., ISOURCE = 150A 0.8VCC 0.8VCC Min 140 100 ASM809, ASM810 Typ Max 560 Unit 240 840 0.3 0.4 0.3 ms V VOH High RESET Output Voltage (ASM809) V VCC - 1.5 0.3 0.4 V V V TRST VCC > VTH 140 240 msec Notes: 1. Production testing done at TA = 25C. Over-temperature specifications guaranteed by design only, using six sigma design limits. 2. RESET output is active LOW for the ASM809 and RESET output is active HIGH for the ASM810. 3 Pin Microcontroller Power Supply Supervisor Notice: The information in this document is subject to change without notice 6 of 10 October 2003 rev 1.0 ASM809, ASM810 Typical Operating Characteristics Unless otherwise noted, VCC is over the full voltage range, TA = -40C to 105C. Typical values at TA = 25C, VCC = 5V for L/M/J devices, VCC = 3.3V for T/S devices and VCC = 3V for R devices. Supply Current vs Tem perature 10 Supply Current (A) 8 6 4 2 0 -40 -20 0 20 40 60 80 100 125 ASM809R ASM809T Tem perature (C) Norm alised Threshold vs Tem perature ASM809T 1.04 Normalised Reset Threshold 1.02 1 0.98 0.96 0.94 0.92 -40 -20 ASM809R 0 20 40 60 80 100 125 Tem perature (C) Reset Tim eout Period vs Tem perature 350 300 250 200 150 100 ASM809R Reset Timeout Period (ms) ASM809T 50 0 -40 -20 0 20 40 60 80 100 125 Tem perature (C) 3 Pin Microcontroller Power Supply Supervisor Notice: The information in this document is subject to change without notice 7 of 10 October 2003 rev 1.0 ASM809, ASM810 Package Dimensions Inches Millimeters Min Max Min Max B Plastic SOT-23 (3-Pin) A A1 B C D E e e1 H L S 0.031 0.004 0.015 0.003 0.110 0.047 0.035 0.070 0.083 0.050 0.010 0.020 0.007 0.120 0.055 0.040 0.080 0.103 9 0.80 0.10 0.37 0.085 2.80 1.20 0.89 1.78 2.10 1.27 0.25 0.51 0.18 3.04 1.40 1.03 2.05 2.64 A1 A S D E H e a e1 C L 0.027 REF 0.018 0.024 0.069 REF 0.45 0.60 3 Pin Microcontroller Power Supply Supervisor Notice: The information in this document is subject to change without notice 8 of 10 October 2003 rev 1.0 ASM809, ASM810 Ordering Information: Part Number 1 Reset Threshold (V) Temperature Range Pin-Package Package Marking (XX Lot Code) ASM809 ACTIVE LOW RESET ASM809LEUR-T ASM809MEUR-T ASM809JEUR-T ASM809TEUR-T ASM809SEUR-T ASM809REUR-T 4.63 4.38 4.00 3.08 2.93 2.63 -40C to +105C -40C to +105C -40C to +105C -40C to +105C -40C to +105C -40C to +105C ASM810 ACTIVE HIGH RESET ASM810LEUR-T ASM810MEUR-T ASM810JEUR-T ASM810TEUR-T ASM810SEUR-T ASM810REUR-T 4.63 4.38 4.00 3.08 2.93 2.63 -40C to +105C -40C to +105C -40C to +105C -40C to +105C -40C to +105C -40C to +105C 3-SOT23 3-SOT23 3-SOT23 3-SOT23 3-SOT23 3-SOT23 SGXX SHXX SIXX SJXX SKXX SLXX 3-SOT23 3-SOT23 3-SOT23 3-SOT23 3-SOT23 3-SOT23 SAXX SBXX SCXX SDXX SEXX SFXX Notes: 1. Tape and Reel packaging is indicated by the -T designation. Related Products: ASM809 Max Supply Current Package Pins Manual RESET input Package Type Active-HIGH RESET Output Active-LOW RESET Output SOT-23 15A 3 ASM810 15A 3 ASM811 15A 4 ASM812 15A 4 SOT-23 SOT-143 SOT-143 3 Pin Microcontroller Power Supply Supervisor Notice: The information in this document is subject to change without notice 9 of 10 ASM809, ASM810 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: ASM809, ASM810 Document Version: v 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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