ASM811, ASM812 October 2003 rev 1.0 4 Pin µP Voltage Supervisor with Manual Reset General Description Six voltage thresholds are available to support 3V to 5V systems: The ASM811/ASM812 are cost effective low power supervisors RESET THRESHOLD designed to monitor voltage levels of 3.0V, 3.3V and 5.0V power supplies in low-power microprocessor (µP), Suffix Voltage L 4.63 M 4.38 A reset signal is issued if the power supply voltage drops below J 4.00 a preset reset threshold and is asserted for at least 140ms after T 3.08 the supply has risen above the reset threshold. The ASM811 S 2.93 has an active-low output RESET that is guaranteed to be in the R 2.63 microcontroller (µC) and digital systems. They provide excellent reliability by eliminating external components and adjustments. 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. Applications 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 Typical Operating Circuit • Computers and Controllers • Embedded controllers • Portable/Battery operated systems • Intelligent instruments • Wireless communication systems • PDAs and handheld equipment • Automotive systems • Safety Systems 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 ASM811, ASM812 October 2003 rev 1.0 Pin Diagram: Block Diagram SOT143 GND VCC 4 VCC 1 20kΩ MR ASM811 (ASM812) (RESET) RESET 2 VCC 3 MR + + - Pin Description RESET Generator 4.63V 4.38V 4.00V 4.38V 3.08V 2.93V 2.63V RESET (RESET) ASM811 (ASM812) GND Pin # Pin Name ASM811 ASM812 1 1 GND 2 - RESET - 2 RESET 3 3 MR 4 4 VCC Function Ground. 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) Detailed Description Manual Reset (MR) Input A proper reset input enables a microprocessor / microcontroller to start in a known state. ASM811/812 assert reset to prevent code execution errors during power-up, powerdown and brown-out conditions. 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. 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 A 0.1µF capacitor from MR to ground can be added for additional noise immunity. 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 ASM811, ASM812 October 2003 rev 1.0 VTH 5V VCC TRST MR 5V 0V 100kΩ ASM811 Power Supply MR TMRST ASM811 5V 0V ASM812 ASM812 Power Supply RESET MR RESET 100kΩ GND 5V RESET 0V RESET VCC VCC 0V GND 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 Negative VCC Transients the system begin operation from a known state. A reset Typically short duration transients of 100mV amplitude and output to a processor is provided to prevent improper 20µs duration do not cause a false RESET. A 0.1µF capacitor operation during power supply sequencing or low voltage at VCC increses transient immunity. brown-out conditions. Bidirectional Reset Pin Interfacing The ASM811/812 are designed to monitor the system power The ASM811/812 can interface with µP / µC bi-directional supply voltages and issue a reset signal when the levels are reset pins by connecting a 4.7kΩ resistor in series with the out of range. RESET outputs are guaranteed to be active for ASM811/812 reset output and the µP/µC bi-directional reset VCC above 1.1V. When VCC exceeds the reset threshold, an internal timer keeps RESET active for the reset timeout input pin. BUF Buffered RESET period, after which RESET becomes inactive (HIGH for the ASM811 and LOW for the ASM812). If VCC drops below the VCC 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 ASM811 Power supply 4.7kΩ MR or even an external switch. µC or µP RESET RESET Input GND GND 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. Bi-directional I/O Pin Figure 4: Bi-directional Reset Pin Interface A 100kΩ pull-up resistor to VCC is needed with the ASM812. 4 Pin µP Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice 3 of 10 ASM811, ASM812 October 2003 rev 1.0 Absolute Maximum Ratings, Table 1: Parameter Min Max Units VCC -0.3 6.0 V RESET, RESET and MR -0.3 VCC + 0.3 V Input current at VCC and MR 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) Derate SOT-143 4mW/°C above 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. 4 Pin µP Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice 4 of 10 ASM811, ASM812 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 VTH TCVTH Parameter Input Voltage Range Supply Current (Unloaded) Conditions Min TA = 0°C to 70°C TA = -40°C to 105°C 1.1 1.2 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 9 6.8 Unit 5.5 5.5 V V 15 10 25 20 µA TA = 25°C TA = -40°C to 85°C TA = 85°C to 105°C 4.56 4.50 4.40 4.63 4.70 4.75 4.86 M devices TA = 25°C TA = -40°C to 85°C TA = 85°C to 105°C 4.31 4.25 4.16 4.38 4.45 4.50 4.56 J devices TA = 25°C TA = -40°C to 85°C TA = 85°C to 105°C 3.93 3.89 3.80 4.00 4.06 4.10 4.20 T devices TA = 25°C TA = -40°C to 85°C TA = 85°C to 105°C 3.04 3.00 2.92 3.08 3.11 3.15 3.23 S devices TA = 25°C TA = -40°C to 85°C TA = 85°C to 105°C 2.89 2.85 2.78 2.93 2.96 3.00 3.08 R devices TA = 25°C TA = -40°C to 85°C TA = 85°C to 105°C 2.59 2.55 2.50 2.63 2.66 2.70 2.76 V Reset Threshold Temp. Coefficient VCC = VTH to (VTH - 125mV), TA = 0°C to 70°C Reset Active Timeout Period TA = -40°C to 105°C MR Minimum Pulse Width Max L devices Reset Threshold VCC to Reset Delay tMR Typ 30 ppm/°C 60 µs 140 100 560 240 840 10 ms 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 ASM811, ASM812 October 2003 rev 1.0 Symbol tMD VIH Parameter VOL Unit ns MR to RESET Propogation Delay Note 2 0.5 µs VCC > VTH (MAX), ASM811/812L/M/J MR Input Threshold VCC > VTH (MAX), ASM811/812R/S/T MR Input Threshold Low RESET Output Voltage (ASM811) High RESET Output Voltage (ASM811) Low RESET Output Voltage (ASM812) 2.3 V 0.8 0.77VCC 10 20 30 VCC= VTH min., ISINK = 1.2mA, ASM811R/S/T 0.3 VCC= VTH min., ISINK = 3.2mA, ASM811L/M/J 0.4 VCC > 1.1V, ISINK = 50µA 0.3 VCC > VTH max., ISOURCE = 500µA, ASM811R/S/T kΩ V 0.8VCC V VCC > VTH max., ISOURCE = 800µA, ASM811L/M/J VCC - 1.5 VCC= VTH max., ISINK = 1.2mA, ASM812R/S/T 0.3 VCC= VTH max., ISINK = 3.2mA, ASM812L/M/J 0.4 V High RESET Output Voltage (ASM812) 1.8V < VCC < VTH min., ISOURCE = 150µA 0.8VCC TRST Active Reset Timeout Period VCC > VTH 140 Manual Active Reset Timeout Period V 0.25VCC VOH TMRST Max 100 MR Pullup Resistance VOH Typ Note 3 VIL VOL Min MR Glitch Immunity VIL VIH Conditions MR returns HIGH V 240 msec 180 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 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 ASM811, ASM812 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 Supply Current (µA) 10 ASM811T 8 6 4 ASM811R 2 0 -40 -20 0 20 40 60 80 100 125 100 125 Tem perature (°C) Normalised Reset Threshold Norm alised Reset Threshold vs Tem perature 1.02 1.01 1 0.99 0.98 0.97 0.96 0.95 -40 ASM811T ASM811R -20 0 20 40 60 80 Tem perature (°C) Reset Timeout Period (ms) Reset Tim eout Period vs Tem perature 400 350 300 250 200 150 100 50 0 -40 ASM811R 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 ASM811, ASM812 October 2003 rev 1.0 Package Dimensions: Plastic SOT-143 (4-Pin) Inches Millimeters e1 B Min Max Min Max A 0.031 0.047 0.787 1.194 A1 0.001 0.005 0.025 0.127 B 0.014 0.022 0.356 0.559 B1 0.030 0.038 0.762 0.965 C 0.0034 0.006 0.086 0.152 D 0.105 0.120 2.667 3.048 E 0.047 0.055 1.194 1.397 e 0.070 0.080 1.778 2.032 e1 0.071 0.079 1.803 2.007 H 0.082 0.098 2.083 2.489 L 0.004 0.012 0.102 0.305 E B1 H e D A a = 0° -8° A1 e C 4 Pin µP Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice L 8 of 10 ASM811, ASM812 October 2003 rev 1.0 Ordering Information: Part Number 1 Reset Threshold (V) Temperature Range Pin-Package Package Marking (XX Lot Code) ASM811 ACTIVE LOW RESET ASM811LEUS-T 4.63 -40°C to +105°C 4-SOT143 SMXX ASM811MEUS-T 4.38 -40°C to +105°C 4-SOT143 SNXX ASM811JEUS-T 4.00 -40°C to +105°C 4-SOT143 SOXX ASM811TEUS-T 3.08 -40°C to +105°C 4-SOT143 SPXX ASM811SEUS-T 2.93 -40°C to +105°C 4-SOT143 SQXX ASM811REUS-T 2.63 -40°C to +105°C 4-SOT143 SRXX ASM812LEUS-T 4.63 -40°C to +105°C 4-SOT143 SSXX ASM812MEUS-T 4.38 -40°C to +105°C 4-SOT143 STXX ASM812JEUS-T 4.00 -40°C to +105°C 4-SOT143 SUXX ASM812TEUS-T 3.08 -40°C to +105°C 4-SOT143 SVXX ASM812SEUS-T 2.93 -40°C to +105°C 4-SOT143 SWXX ASM812REUS-T 2.63 -40°C to +105°C 4-SOT143 SXXX ASM812 ACTIVE HIGH RESET 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 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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