ASM812

October 2003 rev 1.0 ASM811, ASM812 4 Pin µP Voltage Supervisor with Manual Reset Six voltage thresholds are available to support 3V to 5V systems: General Description The ASM811/ASM812 are cost effective low power supervisors designed to monitor voltage levels of 3.0V, 3.3V and 5.0V power supplies in low-power microprocessor (µP), microcontroller (µC) and digital systems. They provide excellent reliability by eliminating external components and adjustments. 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 ASM811 has an active-low output RESET that is guaranteed to be in the correct state for VCC down to 1.1V. The ASM812 has an activehigh RESET output. The reset comparator is designed to ignore fast transients on VCC. A debounced manual reset input allows the user to manually reset the systems to bring them out of locked state. Low power consumption makes the ASM811/ASM812 ideal for use in portable and battery operated equipment. The ASM811/ ASM812 are available in a compact 4-pin SOT-143 package and thus use minimal board space. RESET THRESHOLD Suffix L M J T S R Voltage 4.63 4.38 4.00 3.08 2.93 2.63 Features • • • • • • • • • • New 4.0V threshold option 9µA supply current Monitor 5V, 3.3V and 3V supplies Manual reset input 140ms min. reset pulse width Guaranteed over temperature Active-low reset valid with 1.1V supply (ASM811) Small 4-pin SOT-143 package No external components Power-supply transient-immune design Applications • • • • • • • • Computers and Controllers Embedded controllers Portable/Battery operated systems Intelligent instruments Wireless communication systems PDAs and handheld equipment Automotive systems Safety Systems Typical Operating Circuit VCC VCC VCC µP MR 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 ASM811, ASM812 SOT143 GND 1 ASM811 (ASM812) Pin Diagram: Block Diagram 4 VCC VCC 20kΩ MR VCC 3 MR (RESET) RESET 2 + + - RESET Generator 4.63V 4.38V 4.38V 4.00V 3.08V 2.93V 2.63V RESET (RESET) ASM811 (ASM812) Pin Description GND Pin # ASM811 1 2 ASM812 1 - Pin Name GND RESET Ground. Function RESET is asserted LOW if VCC falls below VTH and remains LOW for TRST after VCC exceeds the Threshold. In addition, RESET is active LOW as long as the manual reset is low. RESET is asserted HIGH if VCC falls below VTH and remains HIGH for TRST after VCC exceeds the threshold. In addition, RESET is active HIGH as long as the manual reset is low. Manual Reset Input. A logic LOW on MR asserts reset. Reset remains active as long as MR is LOW and for TMRST after MR returns HIGH. The active low input has an internal 20kΩ pull-up resistor. The input should be left open if not used. It can be driven by TTL or CMOS logic or shorted to ground by a switch. Power supply input voltage (3.0V, 3.3V, 5.0V) - 2 RESET 3 3 MR 4 4 VCC Detailed Description Manual Reset (MR) Input A proper reset input enables a microprocessor / A logic low on MR assserts RESET LOW on the ASM811 and RESET HIGH on the ASM812. MR is internally pulled high through a 20kΩ resistor and can be driven by TTL/CMOS gates or with open collector/drain outputs. MR can be left open if not used. MR may be connected to ground through a normallyopen momentary switch without an external debounce circuit. A 0.1µF capacitor from MR to ground can be added for additional noise immunity. microcontroller to start in a known state. ASM811/812 assert reset to prevent code execution errors during power-up, powerdown and brown-out conditions. Reset Timing The reset signal is asserted- LOW for the ASM811 and HIGH for the ASM812- 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. 4 Pin µP Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice 2 of 10 October 2003 rev 1.0 5V 0V TRST MR Power Supply MR ASM811, ASM812 VCC VTH VCC VCC 100kΩ ASM811 RESET GND 100kΩ Power Supply ASM812 MR RESET GND 5V 0V TMRST 5V RESET 0V RESET ASM811 ASM812 5V 0V Figures 2 & 3: RESET valid with VCC under 1.1V Figure 1: Reset Timing and Manual Reset (MR) Application Information Reset Output Operation In µP / µC systems it is important to have the processor and the system begin operation from a known state. A reset output to a processor is provided to prevent improper operation during power supply sequencing or low voltage brown-out conditions. Bidirectional Reset Pin Interfacing The ASM811/812 are designed to monitor the system power supply voltages and issue a reset signal when the levels are out of range. RESET outputs are guaranteed to be active for VCC above 1.1V. When VCC exceeds the reset threshold, an internal timer keeps RESET active for the reset timeout period, after which RESET becomes inactive (HIGH for the ASM811 and LOW for the ASM812). If VCC drops below the reset threshold, RESET automatically becomes active. Alternatively, external circuitry or an operator can initiate this condition using the Manual Reset (MR) pin. MR can be left open if it is not used. MR can be driven by TTL/CMOS logic or even an external switch. Valid Reset with VCC under 1.1V To ensure logic inputs connected to the ASM811 RESET pin are in a known state when VCC is under 1.1V, a 100kΩ pulldown resistor at RESET is needed. The value is not critical. A 100kΩ pull-up resistor to VCC is needed with the ASM812. Bi-directional I/O Pin Power supply VCC Negative VCC Transients Typically short duration transients of 100mV amplitude and 20µs duration do not cause a false RESET. A 0.1µF capacitor at VCC increses transient immunity. The ASM811/812 can interface with µP / µC bi-directional reset pins by connecting a 4.7kΩ resistor in series with the ASM811/812 reset output and the µP/µC bi-directional reset input pin. BUF Buffered RESET ASM811 4.7kΩ µC or µP RESET Input GND MR RESET GND Figure 4: Bi-directional Reset Pin Interface 4 Pin µP Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice 3 of 10 October 2003 rev 1.0 ASM811, ASM812 Absolute Maximum Ratings, Table 1: Parameter Pin Terminal Voltage With Respect To Ground VCC RESET, RESET and MR Input current at VCC and MR 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/µs 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 = 70°C) Derate SOT-143 4mW/°C above 70°C Operating temperature range Storage temperature range Lead temperature (Soldering, 10 sec) -40 -65 Min Max 320 105 160 300 Units uW °C °C °C 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. 4 Pin µP Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice 4 of 10 October 2003 rev 1.0 ASM811, ASM812 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 Parameter Input Voltage Range Conditions TA = 0°C to 70°C TA = -40°C to 105°C TA= -40°C to 85°C TA = -40°C to 85°C TA = 85°C to 105°C TA = 85°C to 105°C VCC < VCC < VCC < VCC < 5.5V, L/M/J 3.6V, R/S/T 5.5V, L/M/J 3.6V, R/S/T Min 1.1 1.2 Typ Max 5.5 5.5 Unit V V ICC Supply Current (Unloaded) 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 µA L devices TA = 25°C TA = -40°C to 85°C TA = 85°C to 105°C TA = 25°C TA = -40°C to 85°C TA = 85°C to 105°C TA = 25°C TA = -40°C to 85°C TA = 85°C to 105°C TA = 25°C TA = -40°C to 85°C TA = 85°C to 105°C TA = 25°C TA = -40°C to 85°C TA = 85°C to 105°C TA = 25°C TA = -40°C to 85°C TA = 85°C to 105°C 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 M devices 4.38 J devices VTH Reset Threshold T devices 4.00 V 3.08 3.11 3.15 3.23 2.96 3.00 3.08 2.66 2.70 2.76 ppm/°C µs 560 240 840 ms S devices 2.93 R devices 2.63 TCVTH Reset Threshold Temp. Coefficient VCC to Reset Delay VCC = VTH to (VTH - 125mV), TA = 0°C to 70°C Reset Active Timeout Period TA = -40°C to 105°C 140 100 10 30 60 tMR MR Minimum Pulse Width 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 ASM811 and RESET output is active HIGH for the ASM812. 3. Glitches of 100ns or less typically will not generate a reset pulse. 4 Pin µP Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice 5 of 10 October 2003 rev 1.0 Symbol Parameter MR Glitch Immunity tMD VIH VIL VIH VIL MR Pullup Resistance VCC= VTH min., ISINK = 1.2mA, ASM811R/S/T VOL Low RESET Output Voltage (ASM811) VCC= VTH min., ISINK = 3.2mA, ASM811L/M/J VCC > 1.1V, ISINK = 50µA VCC > VTH max., ISOURCE = 500µA, ASM811R/S/T VCC > VTH max., ISOURCE = 800µA, ASM811L/M/J VCC= VTH max., ISINK = 1.2mA, ASM812R/S/T VCC= VTH max., ISINK = 3.2mA, ASM812L/M/J VOH TRST TMRST High RESET Output Voltage (ASM812) Active Reset Timeout Period Manual Active Reset Timeout Period 1.8V < VCC < VTH min., ISOURCE = 150µA VCC > VTH MR returns HIGH 0.8VCC 140 0.8VCC MR Input Threshold MR to RESET Propogation Delay MR Input Threshold ASM811, ASM812 Conditions Note 3 Note 2 VCC > VTH (MAX), ASM811/812L/M/J VCC > VTH (MAX), ASM811/812R/S/T 2.3 V 0.8 0.77VCC 0.25VCC 10 20 30 0.3 kΩ Min Typ 100 0.5 Max Unit ns µs V 0.4 V 0.3 VOH High RESET Output Voltage (ASM811) V VCC - 1.5 0.3 V 0.4 V 240 180 msec msec VOL Low RESET Output Voltage (ASM812) 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 ASM811 and RESET output is active HIGH for the ASM812. 3. Glitches of 100ns or less typically will not generate a reset pulse. 4 Pin µP Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice 6 of 10 October 2003 rev 1.0 ASM811, ASM812 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 10 Supply Current (µA) 8 6 4 2 0 -40 -20 0 20 40 60 80 100 125 ASM811R ASM811T Tem perature (°C) Norm alised Reset Threshold vs Tem perature 1.02 1.01 1 0.99 0.98 0.97 0.96 0.95 -40 ASM811T Normalised Reset Threshold ASM811R -20 0 20 40 60 80 100 125 Tem perature (°C) Reset Tim eout Period vs Tem perature 400 350 300 250 200 150 100 50 0 -40 ASM811R Reset Timeout Period (ms) ASM811T -20 0 20 40 60 80 100 125 Tem perature (°C) 4 Pin µP Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice 7 of 10 October 2003 rev 1.0 ASM811, ASM812 Package Dimensions: Plastic SOT-143 (4-Pin) Inches Min A A1 B B1 C D E e e1 H L 0.031 0.001 0.014 0.030 0.0034 0.105 0.047 0.070 0.071 0.082 0.004 Max 0.047 0.005 0.022 0.038 0.006 0.120 0.055 0.080 0.079 0.098 0.012 Millimeters B e1 Min 0.787 0.025 0.356 0.762 0.086 2.667 1.194 1.778 1.803 2.083 0.102 Max 1.194 0.127 0.559 0.965 0.152 3.048 1.397 2.032 2.007 2.489 0.305 A1 e C L A a = 0° -8° E H B1 e D 4 Pin µP Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice 8 of 10 October 2003 rev 1.0 ASM811, ASM812 Ordering Information: Part Number 1 Reset Threshold (V) Temperature Range Pin-Package Package Marking (XX Lot Code) ASM811 ACTIVE LOW RESET ASM811LEUS-T ASM811MEUS-T ASM811JEUS-T ASM811TEUS-T ASM811SEUS-T ASM811REUS-T ASM812 ACTIVE HIGH RESET ASM812LEUS-T ASM812MEUS-T ASM812JEUS-T ASM812TEUS-T ASM812SEUS-T ASM812REUS-T 4.63 4.38 4.00 3.08 2.93 2.63 -40°C to +105°C -40°C to +105°C -40°C to +105°C -40°C to +105°C -40°C to +105°C -40°C to +105°C 4-SOT143 4-SOT143 4-SOT143 4-SOT143 4-SOT143 4-SOT143 SSXX STXX SUXX SVXX SWXX SXXX 4.63 4.38 4.00 3.08 2.93 2.63 -40°C to +105°C -40°C to +105°C -40°C to +105°C -40°C to +105°C -40°C to +105°C -40°C to +105°C 4-SOT143 4-SOT143 4-SOT143 4-SOT143 4-SOT143 4-SOT143 SMXX SNXX SOXX SPXX SQXX SRXX 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 SOT - 23 SOT - 143 SOT - 143 15µA 3 ASM810 15µA 3 ASM811 15µA 4 ASM812 15µA 4 4 Pin µP Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice 9 of 10 ASM811, ASM812 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: ASM811, ASM812 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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