ASM809, ASM810 October 2003 rev 1.0 3 Pin Microcontroller Power Supply Supervisor General Description Six voltage thresholds are available to support 3V to 5V systems: The ASM809/ASM810 are cost effective 3.0V, 3.3V and 5.0V RESET THRESHOLD power supply supervisor circuits optimized for low-power microprocessor (µP), microcontroller (µC) 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 Suffix Voltage L 4.63 M 4.38 J 4.00 T 3.08 S 2.93 R 2.63 Features: active-high RESET output. The reset comparator is designed to • Monitor 5V, 3.3V and 3V supplies • 140ms min. reset pulse width Low supply current makes the ASM809/ASM810 ideal for use • Active-low reset valid with 1.1V supply (ASM809) in The • Small 3-pin SOT-23 package ASM809/ASM810 are available in a compact, industry standard • No external components 3-pin SOT23 package. • Specified over full temperature range - -40°C to 105°C Applications Typical Operating Circuit ignore fast transients on VCC. portable and battery operated • Embedded controllers • Portable/Battery operated systems • Intelligent instruments • Wireless communication systems • PDAs and handheld equipment • Computers equipment. VCC VCC VCC µP 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 ASM809, ASM810 October 2003 rev 1.0 Pin Diagram Block Diagram SOT23 GND + - VCC 1 ASM809 (ASM810) + - 3 VCC 2 (RESET) RESET RESET Generator 4.63V 4.38V 4.00V 3.08V 2.93V 2.63V RESET (RESET) ASM809 (ASM810) GND Pin Description Pin # Pin Name ASM809 ASM810 1 - GND - RESET - 2 RESET 3 - VCC 2 Function 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). Detailed Description A proper reset input enables a microprocessor / VCC microcontroller to start in a known state. ASM809/810 assert 5V VTH 0V reset to prevent code execution errors during power-up, power-down and brown-out conditions. RESET 5V 0V RESET 5V 0V Reset Timing The reset signal is asserted- LOW for the ASM809 and HIGH TRST ASM809 ASM810 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. 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 ASM809, ASM810 October 2003 rev 1.0 Application Information Bidirectional Reset Pin Interfacing The ASM809/810 can interface with µP / µC bi-directional Negative VCC Transients The ASM809/810 protect µPs from brownouts and low VCC. Short duration transients of 100mV amplitude and 20µs or less duration typically do not cause a false RESET. reset pins by connecting a 4.7kΩ resistor in series with the ASM809/810 reset output and the µP/µC bi-directional reset pin. Valid Reset with VCC under 1.1V BUF Buffered RESET When VCC is under 1.1V, to ensure logic inputs connected to the ASM809 RESET pin are in a known state, a 100kΩ pull- VCC down resistor is needed at RESET . The value of the resistor is not critical. A 100kΩ pull-up resistor to VCC at RESET is needed with the ASM810. Power supply ASM809 RESET VCC Power Supply µC or µP 4.7kΩ RESET Input GND Bi-directional I/O Pin ASM809 Figure 4: Bidirectional Reset Pin Interfacing RESET GND GND 100kΩ Figure 2: RESET valid with VCC under 1.1V VCC 100kΩ 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 ASM809, ASM810 October 2003 rev 1.0 Absolute Maximum Ratings Table 1: Parameter Min Max Units VCC -0.3 6.0 V RESET, RESET -0.3 VCC + 0.3 V Input current at VCC 20 mA Output current: RESET, RESET 20 mA Rate of Rise at VCC 100 V/µs Pin Terminal Voltage With Respect To Ground 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 Min Power Dissipation (TA = 70°C) Max Units 320 uW Operating temperature range -40 105 °C Storage temperature range -65 160 °C 300 °C Lead temperature (Soldering, 10 sec) 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 ASM809, ASM810 October 2003 rev 1.0 Electrical Characteristics: Unless otherwise noted, VCC is over the full voltage range, TA = -40°C to 105°C. Typical values at TA = 25°C, VCC = 5V for L/M/J devices, VCC = 3.3V for T/S devices and VCC = 3V for R devices. Symbol VCC ICC Parameter Input Voltage Range Supply Current Conditions TA = 0°C to 70°C TA= -40°C to 85°C VCC < 5.5V, L/M/J TA = -40°C to 85°C VCC < 3.6V, R/S/T TA = 85°C to 105°C VCC < 5.5V, L/M/J TA = 85°C to 105°C VCC < 3.6V, R/S/T TA = 25°C TA = -40°C to 85°C TA = 85°C to 105°C TA = 25°C M devices TA = -40°C to 85°C TA = 85°C to 105°C TA = 25°C J devices VTH TA = -40°C to 85°C TA = 85°C to 105°C Reset Threshold TA = 25°C T devices TA = -40°C to 85°C TA = 85°C to 105°C TA = 25°C S devices TA = -40°C to 85°C TA = 85°C to 105°C TA = 25°C R devices TA = -40°C to 85°C TA = 85°C to 105°C Reset Threshold Temp Coefficient VCC to Reset Delay Typ 1.1 1.2 TA = -40°C to 105°C L devices Min VCC = VTH to VTH-100mV 9 6.8 Max Unit 5.5 5.5 V V 15 10 25 20 µA 4.56 4.50 4.40 4.63 4.70 4.75 4.86 4.31 4.25 4.16 4.38 4.45 4.50 4.56 3.93 3.89 3.80 4.00 4.06 4.10 4.20 3.04 3.00 2.92 3.08 3.11 3.15 3.23 2.89 2.85 2.78 2.93 2.96 3.00 3.08 2.59 2.55 2.50 2.63 2.66 2.70 2.76 V 30 ppm/°C 60 µs Notes: 1. Production testing done at TA = 25°C. 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 ASM809, ASM810 October 2003 rev 1.0 Symbol Parameter Reset Active Timeout Period VOL VOH Low RESET Output Voltage (ASM809) High RESET Output Voltage (ASM809) Conditions TA = -40°C to 85°C 140 TA = 85°C to 105°C 100 Low RESET Output Voltage (ASM810) Typ Max 240 840 0.3 VCC= VTH min., ISINK = 3.2mA, ASM809L/M/J 0.4 VCC > 1.1V, ISINK = 50µA 0.3 VCC > VTH max., ISOURCE = 500µA, ASM809R/ S/T VCC > VTH max., ISOURCE = 800µA, ASM809L/ Unit 560 VCC= VTH min., ISINK = 1.2mA, ASM809R/S/T M/J VOL Min ms V 0.8VCC V VCC - 1.5 VCC= VTH max., ISINK = 1.2mA, ASM810R/S/T 0.3 V VCC= VTH max., ISINK = 3.2mA, ASM810L/M/J 0.4 V VOH High RESET Output Voltage (ASM810) 1.8V < VCC < VTH min., ISOURCE = 150µA TRST Active Reset Timeout Period VCC > VTH 0.8VCC 140 V 240 msec Notes: 1. Production testing done at TA = 25°C. 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 ASM809, ASM810 October 2003 rev 1.0 Typical Operating Characteristics Unless otherwise noted, VCC is over the full voltage range, TA = -40°C to 105°C. Typical values at TA = 25°C, 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 ASM809T Supply Current (µA) 10 8 6 ASM809R 4 2 0 -40 -20 0 20 40 60 80 100 125 Tem perature (°C) Norm alised Threshold vs Tem perature ASM809T Normalised Reset Threshold 1.04 1.02 1 0.98 0.96 ASM809R 0.94 0.92 -40 -20 0 20 40 60 80 100 125 Tem perature (°C) Reset Timeout Period (ms) Reset Tim eout Period vs Tem perature ASM809R 350 300 250 200 150 100 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 ASM809, ASM810 October 2003 rev 1.0 Package Dimensions Inches Min Max Millimeters Min Max Plastic SOT-23 (3-Pin) B A 0.031 0.050 0.80 1.27 A1 0.004 0.010 0.10 0.25 B 0.015 0.020 0.37 0.51 C 0.003 0.007 0.085 0.18 D 0.110 0.120 2.80 3.04 E 0.047 0.055 1.20 1.40 e 0.035 0.040 0.89 1.03 e1 0.070 0.080 1.78 2.05 H 0.083 0.103 9 2.10 2.64 L S 0.027 REF 0.018 0.024 E H e S D A a A1 e1 C L 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 ASM809, ASM810 October 2003 rev 1.0 Ordering Information: Part Number 1 Reset Threshold (V) Temperature Range Pin-Package Package Marking (XX Lot Code) ASM809 ACTIVE LOW RESET ASM809LEUR-T 4.63 -40°C to +105°C 3-SOT23 SAXX ASM809MEUR-T 4.38 -40°C to +105°C 3-SOT23 SBXX ASM809JEUR-T 4.00 -40°C to +105°C 3-SOT23 SCXX ASM809TEUR-T 3.08 -40°C to +105°C 3-SOT23 SDXX ASM809SEUR-T 2.93 -40°C to +105°C 3-SOT23 SEXX ASM809REUR-T 2.63 -40°C to +105°C 3-SOT23 SFXX ASM810 ACTIVE HIGH RESET ASM810LEUR-T 4.63 -40°C to +105°C 3-SOT23 SGXX ASM810MEUR-T 4.38 -40°C to +105°C 3-SOT23 SHXX ASM810JEUR-T 4.00 -40°C to +105°C 3-SOT23 SIXX ASM810TEUR-T 3.08 -40°C to +105°C 3-SOT23 SJXX ASM810SEUR-T 2.93 -40°C to +105°C 3-SOT23 SKXX ASM810REUR-T 2.63 -40°C to +105°C 3-SOT23 SLXX Notes: 1. Tape and Reel packaging is indicated by the -T designation. Related Products: Max Supply Current Package Pins ASM809 ASM810 ASM811 ASM812 15µA 15µA 15µA 15µA 3 3 4 4 SOT-143 SOT-143 Manual RESET input Package Type SOT-23 Active-HIGH RESET Output Active-LOW RESET Output SOT-23 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 © Alliance Semiconductor All Rights Reserved Part Number: ASM809, ASM810 Document Version: v 1.0 © 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. 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