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| Microprocessor Supervisory Circuit in 4-Lead SC70 ADM6711/ADM6713 FEATURES Specified Over Temperature Low Power Consumption (12 A) Precision Monitoring of 2.5 V, 3 V, 3.3 V, and 5 V Power Supply Voltages Reset Timeout Period of 140 ms (Min) Manual Reset Input Output Stages Push-Pull RESET Output (ADM6711) Open-Drain RESET Output (ADM6713) Reset Assertion Down to 1 V VCC Power Supply Glitch Immunity 4-Lead SC70 Package APPLICATIONS Microprocessor Systems Computers Controllers Intelligent Instruments Automotive Systems Portable Instruments FUNCTIONAL BLOCK DIAGRAMS ADM6711 VCC VREF RESET GENERATOR 240 ms RESET MR DEBOUNCE GND ADM6713 VCC VREF RESET RESET GENERATOR 240 ms MR DEBOUNCE GND GENERAL DESCRIPTION The ADM6711/ADM6713 are reset generator circuits suitable for use in microprocessor based systems. They provide a reset signal on power-up, power-down, and whenever the supply voltage falls below a preset threshold. In addition, both parts have a debounced manual reset input so that a reset signal can also be initiated with an external switch or logic signal. With six different reset threshold options available ranging from 2.32 V to 4.63 V, the ADM6711/ADM6713 are suitable for monitoring 2.5 V, 3 V, 3.3 V, and 5 V supplies. A reset timeout of at least 140 ms occurs when VCC rises above the threshold. This gives the supply voltage time to stabilize before the microprocessor starts up. The ADM6711 has a push-pull output, so no additional external components are needed. The ADM6713's open-drain output requires an external pull-up resistor, which can be connected to a voltage higher than VCC, if desired. The parts are highly reliable with accurate voltage references and immunity to fast, negative-going transients on VCC. Low current consumption and space-efficient 4-lead SC70 packaging make the ADM6711/ADM6713 ideal for use in low power portable applications. VCC VCC VCC *RPULL-UP ADM6711/ ADM6713 MR RESET RESET P SYSTEM GND GND *ADM6713 ONLY Figure 1. Typical Operating Circuit REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective companies. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 (c) 2003 Analog Devices, Inc. All rights reserved. ADM6711/ADM6713-SPECIFICATIONS (V for L/M, 3.3 V for T/S, 3 V for R, and 2.5 V for Z models; unless otherwise noted.) Parameter SUPPLY VCC Operating Voltage Range Supply Current Min 1.0 1.2 16 12 Typ Max 5.5 5.5 35 30 60 60 RESET VOLTAGE THRESHOLD ADM671_L CC = Full Operating Range; TA = TMIN to TMAX; VCC Typ = 5 V Test Conditions/Comments TA = 0C to 70C TA = -40C to +125C VCC < 5.5 V, ADM671_L/M, TA = -40C to +85C VCC < 3.6 V, ADM671_R/S/T/Z, TA = -40C to +85C VCC < 5.5 V, ADM671_L/M, TA = 85C to 125C VCC < 3.6 V, ADM671_R/S/T/Z, TA = 85C to 125C TA = 25C TA = -40C to +85C TA = 85C to 125C TA = 25C TA = -40C to +85C TA = 85C to 125C TA = 25C TA = -40C to +85C TA = 85C to 125C TA = 25C TA = -40C to +85C TA = 85C to 125C TA = 25C TA = -40C to +85C TA = 85C to 125C TA = 25C TA = -40C to +85C TA = 85C to 125C Unit V V A A A A ADM671_M ADM671_T ADM671_S ADM671_R ADM671_Z 4.56 4.50 4.44 4.31 4.25 4.20 3.04 3.00 2.95 2.89 2.85 2.81 2.59 2.55 2.52 2.28 2.25 2.22 4.63 4.38 3.08 2.93 2.63 2.32 4.70 4.75 4.82 4.45 4.50 4.56 3.11 3.15 3.21 2.96 3.00 3.05 2.66 2.70 2.74 2.35 2.38 2.42 V V V V V V V V V V V V V V V V V V ppm/C s RESET THRESHOLD TEMPERATURE COEFFICIENT VCC to RESET DELAY RESET ACTIVE TIMEOUT PERIOD RESET OUTPUT VOLTAGE Low (ADM6711/ADM6713) 140 100 30 20 240 460 640 0.3 0.4 0.3 VCC = VTH to (VTH - 100 mV) TA = -40C to +85C TA = 85C to 125C VCC = VTH min, ISINK = 1.2 mA, ADM671_R/S/T/Z VCC = VTH min, ISINK = 3.2 mA, ADM671_L/M VCC >1.0 V, ISINK = 50 A VCC > VTH max, ISOURCE = 500 A, ADM6711R/S/T/Z VCC > VTH max, ISOURCE = 800 A, ADM6711L/M VCC > VTH, RESET deasserted VIL VIH ms ms V V V V V High (ADM6711) 0.8 VCC 0.8 VCC RESET OPEN-DRAIN OUTPUT LEAKAGE CURRENT MANUAL RESET (MR) Input Threshold Pull-Up Resistance Minimum Pulsewidth Glitch Immunity Reset Delay Specifications subject to change without notice. 1 0.3 VCC 0.7 VCC 10 1 20 100 200 A V V k s ns ns -2- REV. 0 ADM6711/ADM6713 ABSOLUTE MAXIMUM RATINGS* (TA = 25C, unless otherwise noted.) Table I. RESET Threshold Options VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V to +6 V RESET (Push-Pull) . . . . . . . . . . . . . . -0.3 V to (VCC + 0.3 V) RESET (Open-Drain) . . . . . . . . . . . . . . . . . . . -0.3 V to +6 V MR . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V to (VCC + 0.3 V) Input Current VCC, MR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA Output Current RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA Rate of Rise, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 V/s JA Thermal Impedance, SC70 . . . . . . . . . . . . . . . . . 146C/W Operating Temperature Range . . . . . . . . . . -40C to +125C Storage Temperature Range . . . . . . . . . . . . -65C to +150C Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . . 300C *Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. Exposure to absolute maximum ratings for extended periods of time may affect device reliability. Model ADM671_L ADM671_M ADM671_T ADM671_S ADM671_R ADM671_Z RESET Threshold (V) 4.63 4.38 3.08 2.93 2.63 2.32 ORDERING GUIDE Model ADM6711LAKS-REEL ADM6711LAKS-REEL-7 ADM6711MAKS-REEL ADM6711MAKS-REEL-7 ADM6711TAKS-REEL ADM6711TAKS-REEL-7 ADM6711SAKS-REEL ADM6711SAKS-REEL-7 ADM6711RAKS-REEL ADM6711RAKS-REEL-7 ADM6711ZAKS-REEL ADM6711ZAKS-REEL-7 ADM6713LAKS-REEL ADM6713LAKS-REEL-7 ADM6713MAKS-REEL ADM6713MAKS-REEL-7 ADM6713TAKS-REEL ADM6713TAKS-REEL-7 ADM6713SAKS-REEL ADM6713SAKS-REEL-7 ADM6713RAKS-REEL ADM6713RAKS-REEL-7 ADM6713ZAKS-REEL ADM6713ZAKS-REEL-7 RESET Threshold (V) 4.63 4.63 4.38 4.38 3.08 3.08 2.93 2.93 2.63 2.63 2.32 2.32 4.63 4.63 4.38 4.38 3.08 3.08 2.93 2.93 2.63 2.63 2.32 2.32 Temperature Range -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C Branding M0B M0B M0C M0C M0D M0D M0E M0E M0F M0F M0G M0G M0H M0H M0J M0J M0K M0K M0L M0L M0M M0M M0N M0N Quantity (k) 10 3 10 3 10 3 10 3 10 3 10 3 10 3 10 3 10 3 10 3 10 3 10 3 CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADM6711/ADM6713 feature proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. REV. 0 -3- ADM6711/ADM6713 PIN CONFIGURATION GND 1 ADM6711 4 VCC ADM6713 TOP VIEW (Not to Scale) RESET 2 3 MR PIN FUNCTION DESCRIPTIONS Pin No. Mnemonic 1 2 GND RESET Function Ground Reference for All Signals. 0 V. Active Low Logic Output. RESET remains low while VCC is below the reset threshold and remains low for 240 ms (typ) after VCC rises above the reset threshold. Manual Reset. This active low debounced input will ignore input pulses of 100 ns (typ) and is guaranteed to accept input pulses of greater than 1 s. Leave floating when not used. Supply Voltage Being Monitored. 3 MR 4 VCC -4- REV. 0 Typical Performance Characteristics-ADM6711/ADM6713 12 IDD @ VCC = 5.5V 289 284 POWER-UP RESET TIMEOUT (ms) 10 ADM671_L/M 279 274 269 264 259 254 249 8 IDD @ VCC = 3V IDD ( A) 6 4 2 IDD @ VCC = 1V ADM671_R/S/T/Z 0 -40 -20 0 20 30 50 70 85 100 120 244 -40 -20 0 20 30 50 70 85 100 120 TEMPERATURE ( C) TEMPERATURE ( C) TPC 1. Supply Current vs. Temperature TPC 4. Power-Up Reset Timeout vs. Temperature 1000 900 1.007 1.006 POWER-DOWN RESET DELAY ( s) NORMALIZED RESET THRESHOLD 50 70 85 100 120 800 700 600 500 400 300 200 100 VOD = 125mV 20 30 VOD = 20mV 1.005 1.004 1.003 1.002 1.001 1.000 0.999 0.998 0.997 0.996 0.995 -40 -20 0 20 30 50 70 85 100 120 VOD = 200mV 0 -40 -20 0 TEMPERATURE ( C) TEMPERATURE ( C) TPC 2. Power-Down RESET Delay vs. Temperature ADM671_R/S/T/Z TPC 5. RESET Threshold Deviation vs. Temperature 900 800 400 700 600 500 400 300 200 100 VOD = 125mV VOD = 20mV MAXIMUM TRANSIENT DURATION ( s) 350 300 250 200 150 100 ADM671_R/S/T/Z 50 0 POWER-DOWN RESET DELAY ( s) ADM671_L/M VOD = 200mV 0 -40 -20 0 20 30 50 70 85 100 120 1 TEMPERATURE ( C) 10 100 RESET COMPARATOR OVERDRIVE, V TH - V CC (mV) 1000 TPC 3. Power-Down RESET Delay vs. Temperature ADM671_L/M TPC 6. Maximum Transient Duration without Causing a RESET Pulse vs. RESET Comparator Overdrive REV. 0 -5- ADM6711/ADM6713 DETAILED DESCRIPTION ADM6713 RESET OUTPUT LOGIC LEVELS The ADM6711/ADM6713 are designed to protect the integrity of a system's operation by ensuring the proper operation of the system during power-up, power-down, and brownout conditions. When the ADM6711/ADM6713 are powered up, the RESET output will remain low for a period equal to the typical reset active timeout period. This is designed to give the system time to power up correctly and for the power supply to stabilize before any devices are brought out of reset and allowed to begin executing instructions. Initializing a system in this way provides a more reliable startup for microprocessor systems. MANUAL RESET INPUT The ADM6713's open-drain RESET output is designed for use with an external pull-up resistor. This resistor can be tied to VCC or any other reasonable voltage level, offering the flexibility to use the ADM6713 to drive a variety of different logic level circuitry. ENSURING A VALID RESET OUTPUT DOWN TO VCC = 0 V The ADM6711/ADM6713's manual reset (MR) input allows the system operator to reset a system by means of an external manual switch. Alternatively, a logic signal from another digital circuit can be used to trigger a reset via the MR input. The MR input will ignore negative-going pulses faster than 100 ns (typically) and is guaranteed to accept any negativegoing input pulse of a duration greater than or equal to 1 s. The RESET output will remain low while MR is held low and for 240 ms (typically) after MR returns high. If MR is connected to long cables or is used in a noisy environment, then placing a 0.1 F capacitor between the MR input and ground will help to remove any fast, negative-going transients. When VCC falls below 0.8 V, the ADM6711's RESET output no longer sinks current. Therefore, a high impedance CMOS logic input connected to RESET may drift to undetermined logic levels. To eliminate this problem, a pull-down resistor should be connected from RESET to ground. A 100 k resistor is large enough not to load RESET and small enough to pull RESET to ground. VCC VCC ADM6711 RESET 100k GND POWER SUPPLY GLITCH IMMUNITY The ADM6711/ADM6713 contain internal filtering circuitry that provides immunity to fast transient glitches on the power supply line. TPC 6 illustrates glitch immunity performance by showing the maximum transient duration without causing a reset pulse for glitches with amplitudes in the range of 1 mV to 1000 mV. Glitch immunity makes the ADM6711/ADM6713 suitable for use in noisy environments. Mounting a 0.1 F decoupling capacitor as close as possible to the VCC pin improves glitch immunity further. Figure 2. Ensuring a Valid RESET Output Down to VCC = 0 V -6- REV. 0 ADM6711/ADM6713 OUTLINE DIMENSIONS 4-Lead Thin Shrink Small Outline Transistor Package [SC70] (EIAJ SC82 body) (KS-4) Dimensions shown in millimeters 2.20 1.80 4 3 1.35 1.15 2.40 1.80 1 2 PIN 1 0.65 BSC 1.00 0.80 0.50 BSC 1.10 0.80 0.18 0.10 0.30 0.10 0.10 MAX 0.30 0.15 SEATING 0.70 PLANE 0.50 0.10 COPLANARITY PACKAGE OUTLINE CORRESPONDS IN FULL TO EIAJ SC82 EXCEPT FOR WIDTH OF PIN-2 AS SHOWN REV. 0 -7- -8- C03754-0-8/03(0) |
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