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| Open-Drain Microprocessor Supervisory Circuit in 4-Lead SOT-143 ADM6315 FEATURES Specified over Temperature Low Power Consumption (5 A Typ) Precision Voltage Monitor of Voltages from 2.5 V to 5 V at 100 mV Increments Reset Assertion Down to VCC > 1 V Reset Timeout Periods: 1 ms, 20 ms, 140 ms, or 1120 ms (Min) Built-In Manual Reset Pin Compatible with the ADM811 Available in SOT-143 Package APPLICATIONS Microprocessor Systems Controllers Intelligent Instruments Automotive Systems Safety Systems Portable Instruments FUNCTIONAL BLOCK DIAGRAM GND VREF VCC ADM6315 RESET RESET CIRCUITRY DEBOUNCE MR VCC 10k SYSTEM POWER ADM6315 P SYSTEM RESET GENERAL DESCRIPTION MR RESET The ADM6315 is a reliable voltage monitoring device that is suitable for use in most voltage monitoring applications. The ADM6315 is designed to monitor as little as a 1.8% degradation of a power supply voltage. Voltages that can be monitored by the ADM6315 are all voltages (at 100 mV increments) from 2.5 V to 5 V. Included in this circuit is a debounced manual reset input. RESET can be activated using an ordinary switch (pulling MR low), a low input from another digital device, or a degradation of the supply voltage. The manual reset function is very useful, especially if the circuit in which the ADM6315 is operating enters into a state that can be detected only by the user. Allowing the user to manually reset a system can reduce the damage or danger that could otherwise be caused by an out-of-control or locked-up system. The ADM6315 comes in a cost and space efficient SOT-143 package. GND GND Figure 1. Typical Operating Circuit REV. C 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 owners. 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. Operating otherwise ADM6315-SPECIFICATIONS (V = Fullnoted.) Range, T = T CC A MIN to TMAX, VCC Typ = 5 V, unless Parameter SUPPLY Operating Voltage VCC Supply Current Min 1 Typ Max 5.5 12 15 10 12 Unit V A A A A Test Conditions/Comments TA = -40C to +85C VCC = 5.5 V, No Load, TA = -40C to +85C VCC = 5.5 V, No Load, TA = -40C to +125C VCC = 3.6 V, No Load, TA = -40C to +85C VCC = 3.6 V, No Load, TA = -40C to +125C TA = 25C TA = -40C to +85C TA = -40C to +125C 5 4 RESET VOLTAGE THRESHOLD (VTH) RESET THRESHOLD TEMPERATURE COEFFICIENT VCC TO RESET DELAY VTH - 1.8% VTH VTH - 2.5% VTH - 3.5% 60 35 1.4 28 200 1570 VTH + 1.8% V VTH + 2.5% V VTH + 3.5% V ppm/C s 2 2.4 40 48 280 336 2240 2688 ms ms ms ms ms ms ms ms V V V V s ns ns k V V V A VCC = Falling at 1 mV/s TA = -40C to +85C TA = -40C to +125C TA = -40C to +85C TA = -40C to +125C TA = -40C to +85C TA = -40C to +125C TA = -40C to +85C TA = -40C to +125C VTH > 4 V (VIL) VTH > 4 V (VIH) VTH < 4 V (VIL) VTH < 4 V (VIH) RESET ACTIVE TIMEOUT PERIOD ADM6315xxD1 1 0.8 ADM6315xxD2 20 16 ADM6315xxD3 140 112 ADM6315xxD4 1120 896 MANUAL RESET Input Threshold 0.8 2.4 0.3 VCC 0.7 VCC Minimum Input Pulse Glitch Rejection To Reset Delay Pull-Up Resistance RESET OUTPUT Output Voltage 1 100 500 63 32 100 0.4 0.3 0.3 1 Output Leakage Current Specifications subject to change without notice. VCC > 4.25 V, ISINK = 3.2 mA VCC > 2.5 V, ISINK = 1.2 mA VCC > 1 V, ISINK = 80 A VCC > VTH, RESET De-asserted -2- REV. C ADM6315 ABSOLUTE MAXIMUM RATINGS* (TA = 25C, unless otherwise noted.) PIN CONFIGURATION Terminal Voltage (With Respect to Ground) VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V to +6 V All Other Inputs . . . . . . . . . . . . . . . . . . . . . . -0.3 V to +6 V Input Current VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA Output Current RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA Power Dissipation (TA = 70C) RA-4, SOT-143 Derate by 4 mW/C above 70C . . . . . . . . . . . . . . 320 mW JA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 330C/W Operating Temperature Range . . . . . . . . . . -40C to +125C Storage Temperature Range . . . . . . . . . . . . -65C to +160C Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . . 300C Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . 215C Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220C ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 kV *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 may affect device reliability. GND 1 ADM6315 TOP VIEW (Not to Scale) 4 VCC RESET 2 3 MR PIN FUNCTION DESCRIPTIONS Pin Mnemonic Function 1 2 GND RESET 0 V. Ground reference for all signals. Active Low Logic Output. RESET remains low while VCC is below the reset threshold or when MR is low; RESET then remains low for either 1 ms (min), 20 ms (min), 140 ms (min), or 1120 ms (min) after VCC rises above the reset threshold and MR is high. Manual Reset. This active low debounced input will ignore input pulses of 100 ns (typical) and is guaranteed to accept input pulses of greater than 1 s. Leave floating when not used. Monitored Supply Voltage. 3 MR 4 VCC 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 ADM6315 features 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. C -3- ADM6315 ORDERING GUIDE 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 -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 Model ADM6315-46D1ART-RL7 ADM6315-46D1ART-RL ADM6315-45D1ART-RL7 ADM6315-45D1ART-RL ADM6315-44D1ART-RL7 ADM6315-44D1ART-RL ADM6315-31D1ART-RL7 ADM6315-31D1ART-RL ADM6315-29D1ART-RL7 ADM6315-29D1ART-RL ADM6315-26D1ART-RL7 ADM6315-26D1ART-RL ADM6315-46D2ART-RL7 ADM6315-46D2ART-RL ADM6315-45D2ART-RL7 ADM6315-45D2ART-RL ADM6315-44D2ART-RL7 ADM6315-44D2ART-RL ADM6315-31D2ART-RL7 ADM6315-31D2ART-RL ADM6315-29D2ART-RL7 ADM6315-29D2ART-RL ADM6315-26D2ART-RL7 ADM6315-26D2ART-RL ADM6315-46D3ART-RL7 ADM6315-46D3ART-RL ADM6315-45D3ART-RL7 ADM6315-45D3ART-RL ADM6315-44D3ART-RL7 ADM6315-44D3ART-RL ADM6315-31D3ART-RL7 ADM6315-31D3ART-RL ADM6315-29D3ART-RL7 ADM6315-29D3ART-RL ADM6315-26D3ART-RL7 ADM6315-26D3ART-RL ADM6315-46D4ART-RL7 ADM6315-46D4ART-RL ADM6315-45D4ART-RL7 ADM6315-45D4ART-RL ADM6315-44D4ART-RL7 ADM6315-44D4ART-RL ADM6315-31D4ART-RL7 ADM6315-31D4ART-RL ADM6315-29D4ART-RL7 ADM6315-29D4ART-RL ADM6315-26D4ART-RL7 ADM6315-26D4ART-RL Package Description Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Small Outline Transistor (SOT-143) Package Option RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 Trip Point 4.63 4.63 4.50 4.50 4.39 4.39 3.08 3.08 2.93 2.93 2.63 2.63 4.63 4.63 4.50 4.50 4.39 4.39 3.08 3.08 2.93 2.93 2.63 2.63 4.63 4.63 4.50 4.50 4.39 4.39 3.08 3.08 2.93 2.93 2.63 2.63 4.63 4.63 4.50 4.50 4.39 4.39 3.08 3.08 2.93 2.93 2.63 2.63 Min Timeout (ms) 1 1 1 1 1 1 1 1 1 1 1 1 20 20 20 20 20 20 20 20 20 20 20 20 140 140 140 140 140 140 140 140 140 140 140 140 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 Branding MDV MDV MDU MDU MDT MDT MDG MDG MDC MDC MDB MDB MEV MEV MEU MEU MET MET MEG MEG MEC MEC MEB MEB MFV MFV MFU MFU MFT MFT MFG MFG MFC MFC MFB MFB MGV MGV MGU MGU MGT MGT MGG MGG MGC MGC MGB MGB -4- REV. C Typical Performance Characteristics-ADM6315 10 MAXIMUM TRANSIENT DURATION - s 800 700 600 500 400 300 200 100 0 8 VCC = 5.5 IDD - A 6 VCC = 3 4 2 VCC = 1 0 -40 -20 0 20 40 60 TEMPERATURE - C 80 100 125 -100 0 8 20 60 100 400 800 1200 1600 4 RESET COMPARATOR OVERDRIVE, (VTH - VCC) - mV TPC 1. Supply Current vs. Temperature TPC 4. Maximum Transient Duration vs. RESET Comparator Overdrive 450 NORMALIZED RESET THRESHOLD - V 400 POWER-DOWN RESET DELAY - s 350 300 250 200 150 100 50 0 -40 VOD = 125mV VOD = 200mV -20 0 20 40 60 TEMPERATURE - C 80 100 125 VOD = 20mV 1.005 1.000 0.995 0.990 -40 -20 0 20 40 60 TEMPERATURE - C 80 100 125 TPC 2. Power-Down Reset Delay vs. Temperature TPC 5. Normalized Reset Threshold vs. Temperature (VCC Falling) 1.06 NORMALIZED RESET TIMEOUT PERIOD - ms 12 +85 C 1.04 A 10 1.00 SUPPLY CURRENT - 1.02 8 6 -40 C +25 C 4 0.98 0.96 2 0.94 -40 -20 0 20 40 60 TEMPERATURE - C 80 100 125 0 0 1 2 3 SUPPLY VOLTAGE - V 4 5 TPC 3. Normalized Reset Timeout Period vs. Temperature (VCC Rising) TPC 6. Supply Current vs. Supply Voltage REV. C -5- ADM6315 INTERFACING TO OTHER DEVICES' OUTPUT The ADM6315 series is designed to integrate with as many devices as possible. One feature of the ADM6315 is the RESET open-drain output, which can sink current from sources with a voltage greater than the VCC of the ADM6315 input, making it suitable for use in more diverse applications. BENEFITS OF A VERY ACCURATE RESET THRESHOLD When a brownout condition occurs (assuming VCC is falling at 1 mV/s), the ADM6315 produces a reset in typically 35 s. Producing a reset this fast means that the entire system can be reset together before any part of the system's voltage falls below its recommended operating voltage. This can avoid dangerous and/or erroneous operation of a microprocessor based system. MANUAL RESET INPUT Because the ADM6315 series can operate effectively even when there are large degradations of the supply voltages (due to an accurate internal voltage reference circuit), the possibility of a malfunction during a power failure is greatly reduced. VCC VCC TRIP POINT (MAX) VCC TRIP POINT VCC TRIP POINT (MIN) RESET VCC TO RESET DELAY The ADM6315 also provides an additional input, MR. This input can be used either as a means for the system operator to manually reset the system via a switch or for a digital circuit to reset the system. The MR input (typically) ignores negative going pulses faster than 100 ns and is guaranteed to accept any negative going input pulse of a duration greater than or equal to 1 s. If MR is connected to long cables or is used in a noisy environment, then placing a 1 F decoupling capacitor between the MR input and ground further improves the glitch immunity of the ADM6315. VCC TRIP POINT (MAX) VCC TRIP POINT VCC TRIP POINT (MIN) VOL Figure 2. VCC Power-Down/Brownout Timing Diagram DETAILED DESCRIPTION VCC RESET ACTIVE TIMEOUT The ADM6315 is 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 ADM6315 is powered up (depending on the selected reset active timeout), the RESET output of the ADM6315 remains low for a period typically equal to the 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. RESET Figure 3. VCC Power-Up Timing Diagram TRANSIENT IMMUNITY As well as being an accurate reset circuit, the ADM6315 has good immunity to negative going transients (TPC 4). Because of this characteristic, the ADM6315 is suitable for use in noisy environments. TPC 4 shows the reset comparator overdrive (the maximum magnitude of negative going pulses with respect to the typical reset threshold) versus the pulse duration, without causing a reset. -6- REV. C ADM6315 OUTLINE DIMENSIONS 4-Lead Small Outline Transistor Package [SOT-143] (RA-4) Dimensions shown in millimeters 1.92 BSC 4 3 1.40 1.20 1 2 2.64 2.10 PIN 1 0.20 BSC 3.04 2.80 1.22 0.80 0.20 0.08 8 0 0.60 0.40 0.15 0.05 SEATING PLANE 0.89 0.76 0.50 0.30 COMPLIANT TO JEDEC STANDARDS TO-253D REV. C -7- ADM6315 Revision History Location 12/03--Data Sheet changed from REV. B to REV. C. Page Edit to ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Edits to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Deleted Table I and Table II . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Deleted Table III and Table IV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Updated OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2/03--Data Sheet changed from REV. A to REV. B. C00081-0-12/03(C) Edits to FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Edits to SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Edits to ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Edits to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Edits to Table I and Table II . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Edits to Table III and Table IV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Updated OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 10/01--Data Sheet changed from REV. 0 to REV. A. Edits to Table III . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Edits to Table IV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 -8- REV. C This datasheet has been download from: www..com Datasheets for electronics components. |
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