MAX809 Very Low Supply Current 3-Pin Microprocessor Reset Monitors The MAX809 is a cost–effective system supervisor circuit designed to monitor VCC in digital systems and provide a reset signal to the host processor when necessary. No external components are required. The reset output is driven active within 10 µsec of VCC falling through the reset voltage threshold. Reset is maintained active for a minimum of 140 msec after VCC rises above the reset threshold. The MAX809 has an active–low RESET output. The output of the MAX809 is guaranteed valid down to VCC = 1.0 V. This device is available in a SOT–23 package. The MAX809 is optimized to reject fast transient glitches on the VCC line. Low supply current of 1.0 µA (VCC = 3.2 V) make this device suitable for battery powered applications. http://onsemi.com MARKING DIAGRAM 3 3 SOT–23 (TO–236) CASE 318 2 xxxM 1 1 2 xxx = Specific Device Code M = Monthly Date Code Features • Precision VCC Monitor for 2.5 V, 3.0 V, 3.3 V, and 5.0 V Supplies • Precision Monitoring Voltages from 1.6 V to 4.9 V Available • • • • • • • in 100 mV Steps 140 msec Guaranteed Minimum RESET Output Duration RESET Output Guaranteed to VCC = 1.0 V Low 1.0 µA Supply Current VCC Transient Immunity Small SOT–23 Package No External Components Wide Operating Temperature: –40°C to 105°C GND RESET RESET 2 SOT–23* NOTE: *SOT–23 is equivalent to JEDEC (TO–236) ORDERING INFORMATION Device VCC MAX809 VCC (Top View) Computers Embedded Systems Battery Powered Equipment Critical µP Power Supply Monitoring VCC 1 3 Typical Applications • • • • PIN CONFIGURATION VCC PROCESSOR Package Shipping MAX809xTR SOT–23 3000/Tape & Reel MAX809SNxxxT1 SOT–23 3000/Tape & Reel NOTE: The “x” and “xxx” denotes a suffix for Vcc voltage threshold options – see page 6 for more details. RESET INPUT DEVICE MARKING INFORMATION GND See general marking information in the device marking section on page 6 of this data sheet. GND Figure 1. Typical Application Diagram Semiconductor Components Industries, LLC, 2001 February, 2001 – Rev. 6 1 Publication Order Number: MAX809/D MAX809 ABSOLUTE MAXIMUM RATINGS* (Notes 1.) Rating Symbol Value Unit VCC 6.0 V –0.3 to (VCC + 0.3) V Input Current, VCC 20 mA Output Current, RESET 20 mA 100 V/µsec Supply Voltage (VCC to GND) RESET dV/dt (VCC) Power Dissipation (TA ≤ 70°C) SOT–23 (derate 4.0 mW/°C above +70°C) PD Operating Temperature Range TA –40 to +105 °C Storage Temperature Range Tstg –65 to +150 °C Lead Temperature (Soldering, 10 Seconds) Tsol +260 °C mW 230 Latch–up performance: ILatch–up mA Positive Negative 200 200 *Maximum Ratings are those values beyond which damage to the device may occur. 1. This device series contains ESD protection and exceeds the following tests: Human Body Model 2000 V per MIL–STD–883, Method 3015. Machine Model Method 350 V. ELECTRICAL CHARACTERISTICS TA = –40°C to +105°C unless otherwise noted. Typical values are at TA = +25°C. (Note 2.) Characteristic Symbol VCC Range TA = 0°C to +70°C TA = –40°C to +105°C Min Typ Max 1.0 1.2 – – 5.5 5.5 Unit V Supply Current VCC = 3.3 V TA = –40°C to +85°C TA = 85°C to +105°C VCC = 5.5 V TA = –40°C to +85°C TA = 85°C to +105°C ICC Reset Threshold (Note 3.) VTH µA – – 0.5 – 1.2 2.0 – – 0.8 – 1.8 2.5 V MAX809SN490 TA = +25°C TA = –40°C to +85°C TA = +85°C to +105°C 4.83 4.78 4.66 4.9 – – 4.97 5.02 5.14 MAX809SN463 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 MAX809SN438 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 MAX809SN400 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 MAX809SN308 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 2. Production testing done at TA = 25°C, over temperature limits guaranteed by design. 3. Contact your ON Semiconductor sales representative for other threshold voltage options. http://onsemi.com 2 MAX809 ELECTRICAL CHARACTERISTICS (continued) TA = –40°C to +105°C unless otherwise noted. Typical values are at TA = +25°C. (Note 4.) Characteristic Symbol Reset Threshold (continued) Min Typ Max VTH Unit V MAX809SN293 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 MAX809SN263 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 MAX809SN232 TA = +25°C TA = –40°C to +85°C TA = +85°C to +105°C 2.28 2.25 2.21 2.32 – – 2.35 2.38 2.45 MAX809SN160 TA = +25°C TA = –40°C to +85°C TA = +85°C to +105°C 1.58 1.56 1.52 1.6 – – 1.62 1.64 1.68 Reset Temperature Coefficient – 30 – ppm/°C VCC to Reset Delay VCC = VTH to (VTH – 100 mV) – 10 – µsec 140 240 460 msec Reset Active Timeout Period RESET Output Voltage Low VCC = VTH – 0.2 V 1.6 V VTH 2.0 V, ISINK = 0.5 mA 2.1 V VTH 4.0 V, ISINK = 1.2 mA 4.1 V VTH 4.9 V, ISINK = 3.2 mA VOL – – 0.3 V RESET Output Voltage High VCC = VTH + 0.2 V 1.6 V VTH 2.4 V, ISOURCE = 200 µA 2.5 V VTH 4.9 V, ISOURCE = 500 µA VOH 0.8 VCC – – V 4. Production testing done at TA = 25°C, over temperature limits guaranteed by design. ÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ PIN DESCRIPTION Pin No. Symbol 1 GND 2 RESET 3 VCC Description Ground RESET output remains low while VCC is below the reset voltage threshold, and for 240 msec (typ.) after VCC rises above reset threshold Supply Voltage (typ.) http://onsemi.com 3 MAX809 APPLICATIONS INFORMATION VCC Transient Rejection valid to VCC = 0 V, a pull–down resistor must be connected from RESET to ground to discharge stray capacitances and hold the output low (Figure 3). This resistor value, though not critical, should be chosen such that it does not appreciably load RESET under normal operation (100 k will be suitable for most applications). The MAX809 provides accurate VCC monitoring and reset timing during power–up, power–down, and brownout/sag conditions, and rejects negative–going transients (glitches) on the power supply line. Figure 2 shows the maximum transient duration vs. maximum negative excursion (overdrive) for glitch rejection. Any combination of duration and overdrive which lies under the curve will not generate a reset signal. Combinations above the curve are detected as a brownout or power–down. Typically, transient that goes 100 mV below the reset threshold and lasts 5 µs or less will not cause a reset pulse. Transient immunity can be improved by adding a capacitor in close proximity to the VCC pin of the MAX809. VCC VCC MAX809 RESET VCC R1 100 k GND VTH Overdrive Figure 3. Ensuring RESET Valid to VCC = 0 V Duration MAXIMUM TRANSIENT DURATION (µsec) Processors With Bidirectional I/O Pins Some µP’s (such as Motorola 68HC11) have bi–directional reset pins. Depending on the current drive capability of the processor pin, an indeterminate logic level may result if there is a logic conflict. This can be avoided by adding a 4.7 k resistor in series with the output of the MAX809 (Figure 4). If there are other components in the system which require a reset signal, they should be buffered so as not to load the reset line. If the other components are required to follow the reset I/O of the µP, the buffer should be connected as shown with the solid line. 120 100 80 60 VTH = 4.9 V VTH = 3.2 V 40 VTH = 1.6 V 20 0 10.0 BUFFER 60.0 110.0 BUFFERED RESET TO OTHER SYSTEM COMPONENTS VCC 160.0 RESET COMPARATOR OVERDRIVE (mV) VCC VCC Figure 2. Maximum Transient Duration vs. Overdrive for Glitch Rejection at 25°C P MAX809 4.7 k RESET RESET RESET Signal Integrity During Power–Down GND The MAX809 RESET output is valid to VCC = 1.0 V. Below this voltage the output becomes an “open circuit” and does not sink current. This means CMOS logic inputs to the µP will be floating at an undetermined voltage. Most digital systems are completely shutdown well above this voltage. However, in situations where RESET must be maintained GND Figure 4. Interfacing to Bidirectional Reset I/O http://onsemi.com 4 MAX809 TYPICAL CHARACTERISTICS 0.90 1.00 85°C SUPPLY CURRENT IN MICROAMP SUPPLY CURRENT IN MICROAMP 1.00 VTH = 4.9 V 0.80 25°C 0.70 0.60 –40°C 0.50 0.40 0.30 0.20 0.10 0.00 0.5 1.5 3.5 2.5 0.50 –40°C 0.40 0.30 0.20 0.10 1.5 2.5 3.5 4.5 5.5 Figure 6. Supply Current vs. Supply Voltage POWER–DOWN RESET DELAY (µS) SUPPLY CURRENT (µA) 0.60 Figure 5. Supply Current vs. Supply Voltage 85°C 1.00 25°C 0.80 –40°C 0.60 0.40 0.20 1.5 1 2 2.5 3 3.5 4 4.5 5 120 VOD = 10 mV VTH = 3.2 V 100 80 60 VOD = 20 mV VOD = 150 mV VOD = 100 mV 40 VOD = 50 mV 20 0 –40 5.5 –20 0 20 40 60 80 SUPPLY VOLTAGE (V) TEMPERATURE (°C) Figure 7. Supply Current vs. Supply Voltage Figure 8. Power–Down Reset Delay vs. Temperature 1.12 1.10 NORMALIZED THRESHOLD VOLTAGE NORMALIZED POWER–UP RESET TIMEOUT 25°C 0.70 SUPPLY VOLTAGE (V) VTH = 1.6 V VTH = 1.6 V 1.08 1.06 VTH = 3.2 V 1.04 1.02 VTH = 4.9 V 1.00 0.98 –40 0.80 SUPPLY VOLTAGE (V) 1.20 0.00 0.5 85°C VTH = 3.2 V 0.00 0.5 5.5 4.5 0.90 –20 0 20 40 60 80 1.002 VTH = 4.9 V 1.001 1.000 0.999 VTH = 3.2 V 0.998 0.997 0.996 0.995 VTH = 1.6 V 0.994 0.993 0.992 –40 TEMPERATURE (°C) –20 0 20 40 60 80 TEMPERATURE (°C) Figure 9. Normalized Power–Up Reset vs. Temperature Figure 10. Normalized Reset Threshold Voltage vs. Temperature http://onsemi.com 5 MAX809 TAPING FORM Component Taping Orientation for 3L SOT–23 (JEDEC–236) Devices USER DIRECTION OF FEED DEVICE MARKING PIN 1 Standard Reel Component Orientation (Mark Right Side Up) Tape & Reel Specifications Table Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size SOT–23 8 mm 4 mm 3000 7 inches MARKING AND THRESHOLD INFORMATION ON Semiconductor Semicond ctor Part # VTH* Description Marking (xxxM) MAX809SN160T1 1.60 160M MAX809SN232T1 2.32 232M MAX809STR 2.93 MAX809LTR 4.63 463M MAX809SN490T1 4.90 490M Push–Pull RESET *Contact your ON Semiconductor sales representative for other threshold voltage options. http://onsemi.com 6 293M MAX809 PACKAGE DIMENSIONS SOT–23 PLASTIC PACKAGE (TO–236) CASE 318–08 ISSUE AF NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. MAXIMUM LEAD THICKNESS INCLUDES LEAD FINISH THICKNESS. MINIMUM LEAD THICKNESS IS THE MINIMUM THICKNESS OF BASE MATERIAL. A L 3 1 V B S 2 G C D H K J http://onsemi.com 7 DIM A B C D G H J K L S V INCHES MIN MAX 0.1102 0.1197 0.0472 0.0551 0.0350 0.0440 0.0150 0.0200 0.0701 0.0807 0.0005 0.0040 0.0034 0.0070 0.0140 0.0285 0.0350 0.0401 0.0830 0.1039 0.0177 0.0236 MILLIMETERS MIN MAX 2.80 3.04 1.20 1.40 0.89 1.11 0.37 0.50 1.78 2.04 0.013 0.100 0.085 0.177 0.35 0.69 0.89 1.02 2.10 2.64 0.45 0.60 MAX809 ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. 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