MAX811, MAX812 4-Pin P Reset Monitors The MAX811 and MAX812 are cost-effective system supervisor circuits designed to monitor VCC in digital systems and provide a reset signal to the host processor when necessary. A manual reset input is provided to override the reset monitor, and is suitable for use as a push-button reset. No external components are required. The reset output is driven active within 20 sec (4 sec for F version) 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 MAX812 has an active-high RESET output while the MAX811 has an active-low RESET output. The output of the MAX811 is guaranteed valid down to VCC = 1 V. Both devices are available in a 4-Pin SOT-143 package. The MAX811/12 are optimized to reject fast transient glitches on the VCC line. Low supply current of 7 A (VCC = 3.3 V) makes these devices suitable for battery powered applications. 4 3 1 SOT-143 CASE 318A 2 PIN CONNECTIONS Features * Precision VCC Monitor for 1.8 V, 2.7 V, 3.0 V, 3.3 V, 5.0 V * * * * * * * http://onsemi.com Nominal Supplies Manual Reset Input 140 msec Guaranteed Minimum RESET, RESET Output Duration RESET Output Guaranteed to VCC = 1.0 V (MAX811) Low 7 A Supply Current VCC Transient Immunity Small SOT-143-4 Package No External Components GND MAX811 (RESET) MAX812 (RESET) 1 4 VCC 2 3 MR ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 6 of this data sheet. Typical Applications * * * * Computers Embedded Systems Battery Powered Equipment Critical P Power Supply Monitoring DEVICE MARKING INFORMATION See general marking information in the device marking section on page 6 of this data sheet. VCC VCC PROCESSOR VCC MR PUSH- BUTTON MAX811 RESET INPUT (ACTIVE LOW) GND GND RESET Typical Operating Circuit Semiconductor Components Industries, LLC, 2001 January, 2001 - Rev. 3 1 Publication Order Number: MAX811/D MAX811, MAX812 ABSOLUTE MAXIMUM RATINGS* Symbol Value Unit Supply Voltage (VCC to GND) Rating - +6.0 V RESET, RESET - -0.3 to (VCC +0.3) V Input Current, VCC - 20 mA Output Current, RESET, RESET - 20 mA Operating Temperature Range TA -40 to +85 C Storage Temperature Range Tstg -65 to +150 C - +260 C Lead Temperature (Soldering, 10 sec) *This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (VCC = 5 V for L/M versions, VCC = 3.3 V for T/S versions, VCC = 3 V for R version, VCC = 2.0 V for F version. TA = -40C to +85C unless otherwise noted. Typical values are at TA = +25C.) (Note 1.) Characteristics Test Conditions Symbol Min Typ Max Unit - VCC 1.2 - 5.5 V VCC VTH, for L, M, R, S, T, F VCC VTH, for L, M, R, S, T VCC VTH, for F ICC - - - 7.0 10 6.0 15 15 12 A MAX81_L: TA = +25C TA = -40C to +85C MAX81_M: TA = +25C TA = -40C to +85C MAX81_T: TA = +25C TA = -40C to +85C MAX81_S: TA = +25C TA = -40C to +85C MAX81_R: TA = +25C TA = -40C to +85C MAX81_F: TA = +25C TA = -40C to +85C VTH 4.54 4.50 4.30 4.25 3.03 3.00 2.88 2.85 2.58 2.55 1.71 1.70 4.63 - 4.38 - 3.08 - 2.93 - 2.63 - 1.75 - 4.72 4.75 4.46 4.50 3.14 3.15 2.98 3.00 2.68 2.70 1.79 1.80 V - - - 30 - ppm/C VCC = VTH to VTH -125 mV; L, M, R, S, T, F - - - 20 5.0 - - sec VCC = VTH(MAX) tRP 140 280 560 msec MR Minimum Pulse Width - tMR 10 - - sec MR Glitch Immunity - - - 0.1 - sec MR to Reset Propagation Delay - tMD - 0.5 - sec VCC VTH(MAX), MAX81_L/M VIH VIL 2.3 - - - - 0.8 V VCC VTH(MAX), MAX81_R/S/T/F VIH VIL 0.7 VCC - - - - 0.15 VCC V VCC Range Supply Current Reset Threshold Reset Threshold Tempco VCC to Reset Delay Reset Active Timeout Period MR Input Threshold - MR Pull-up Resistance RESET Output Voltage High (MAX812) - - 10 20 40 K ISOURCE = 150 A; VCC VTH(MIN) VOH 0.8 VCC - - V 1. Production testing done at TA = +25C, over temperature limits guaranteed by design. http://onsemi.com 2 MAX811, MAX812 ELECTRICAL CHARACTERISTICS (continued) (VCC = 5 V for L/M versions, VCC = 3.3 V for T/S versions, VCC = 3 V for R version, VCC = 2.0 V for F version. TA = -40C to +85C unless otherwise noted. Typical values are at TA = +25C.) (Note 1.) Characteristics RESET Output Voltage Low (MAX812) RESET Output Voltage Low (MAX811) RESET Output Voltage High (MAX811) Symbol Test Conditions Min Typ Max Unit VOL MAX812F only, ISINK = 500 A, VCC = VTH(MAX) - - 0.2 V MAX812R/S/T only, ISINK = 1.2 mA, VCC = VTH(MAX) MAX812L/M only, ISINK = 3.2 mA, VCC = VTH(MAX) - - 0.3 - - 0.4 MAX811R/S/T only, ISINK = 1.2 mA, VCC = VTH(MIN) MAX811F only, ISINK = 500 A, VCC = VTH(MIN) - - 0.3 MAX811L/M only, ISINK = 3.2 mA, VCC = VTH(MIN) ISINK = 50 A, VCC 1.0 V - - 0.4 - - TBD MAX811L/M only, ISOURCE = 800 A, VCC VTH(MAX) MAX811R/S/T/F only, ISOURCE = 500 A, VCC VTH(MAX) VCC -1.5 - - 0.8 VCC - - VOL VOH V V 1. Production testing done at TA = +25C, over temperature limits guaranteed by design. 2. RESET output for MAX811, RESET output for MAX812. PIN DESCRIPTION Pin Number Symbol 1 GND 2 RESET (MAX811) RESET output remains low while VCC is below the reset voltage threshold, and for at least 140 msec min. after VCC rises above reset threshold. 2 RESET (MAX812) RESET output remains high while VCC is below the reset voltage threshold, and for at least 140 msec min. after VCC rises above reset threshold. 3 MR Manual Reset input generates a reset when MR is below VIL. 4 VCC Supply voltage Description Ground http://onsemi.com 3 MAX811, MAX812 APPLICATIONS INFORMATION will be suitable for most applications). Similarly, a pull-up resistor to VCC is required for the MAX812 to ensure a valid high RESET for VCC below 1.1 V. VCC Transient Rejection The MAX811/12 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 1 shows the maximum transient duration vs. maximum negative excursion (overdrive) for glitch rejection. Any combination of duration and overdrive that lays under the curve will not generate a reset signal. Combinations above the curve are detected as a brownout or power-down. Transient immunity can be improved by adding a capacitor in close proximity to the VCC pin of the MAX811/12. VCC VCC MAX811 RESET R1 100 K GND VCC VTH Overdrive Figure 2. Ensuring RESET Valid to VCC = 0 V MAXIMUM TRANSIENT DURATION ( sec) Duration Processors with Bidirectional I/O Pins 400 Some P's (such as Motorola's 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 MAX811/12 (Figure 3). 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 P, the buffer should be connected as shown with the solid line. TA = +25C 320 240 160 MAX811/12 80 0 1 5 100 1000 Reset Comparator Overdrive, [VCCTP-VCC](mV) BUFFER Figure 1. Maximum Transient Duration vs. Overdrive for Glitch Rejection at 25C BUFFERED RESET TO OTHER SYSTEM COMPONENTS VCC VCC VCC RESET Signal Integrity During Power-Down The MAX811 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 P 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 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 2). This resistor value, though not critical, should be chosen such that it does not appreciably load RESET under normal operation (100 k MAX811 4.7 K RESET GND P RESET GND Figure 3. Interfacing to Bidirectional Reset I/O http://onsemi.com 4 MAX811, MAX812 TYPICAL CHARACTERISTICS 8 14 VCC = 5 V 8 VCC = 3 V 6 4 VCC = 1 V 2 0 -40 POWER-DOWN RESET DELAY ( sec ) SUPPLY CURRENT ( A) 10 -20 0 20 40 60 85 4 VCC = 3 V 2 VCC = 1 V 0 -40 -20 40 60 VOD = 20 mV VOD = 200 mV 10 VOD = 100 mV -20 0 20 40 60 85 85 50 L/M VOD = 20 mV 40 VOD = 100 mV VOD = 200 mV 30 R/S/T 20 VOD = 200 mV 0 -40 VOD = 20 mV VOD = 100 mV 10 -20 Temperature (C) 0 20 40 60 85 Temperature (C) Figure 6. Power-Down Reset Delay vs. Temperature (MAX81xF) Figure 7. Power-Down Reset Delay vs. Temperature (MAX81xL/M/R/S/T) 1.003 250 NORMALIZED THRESHOLD (V) POWER-UP RESET TIMEOUT (msec) 20 Figure 5. Supply Current vs. Temperature (No Load, MAX81xL/M) 30 245 MAX81xL/M 240 MAX81xR/S/T/F 235 230 225 -40 0 Figure 4. Supply Current vs. Temperature (No Load, MAX81xR/S/T/F) 40 0 -40 VCC = 5 V Temperature (C) 50 20 6 Temperature (C) POWER-DOWN RESET DELAY ( sec ) SUPPLY CURRENT ( A) 12 1.002 1.001 1.000 0.999 0.998 0.997 0.996 0.995 0.994 -20 0 20 40 60 -40 85 Temperature (C) -15 10 35 60 Temperature (C) Figure 8. Power-Up Reset Timeout vs. Temperature Figure 9. Normalized Reset Threshold vs. Temperature http://onsemi.com 5 65 MAX811, MAX812 MARKING DIAGRAM 1 2 3 4 1 and 2 3 = Part Number Code and Temperature Range (two-digit code) = Year and Quarter Code 4 = Lot ID Number ORDERING INFORMATION Threshold Voltage 1 and 2 MAX811LEUS-T* MAX811MEUS-T* MAX811TEUS-T MAX811SEUS-T* MAX811REUS-T* MAX811FEUS-T 4.63 4.38 3.08 2.93 2.63 1.75 S1 S2 S3 S4 S5 S7 MAX812LEUS-T* MAX812MEUS-T* MAX812TEUS-T MAX812SEUS-T* MAX812REUS-T* MAX812FEUS-T 4.63 4.38 3.08 2.93 2.63 1.75 T1 T2 T3 T4 T5 T7 Device Marking *Default: Contact your ON Semiconductor sales representative for other threshold voltage options. http://onsemi.com 6 Package (Qty/Reel) 3000 Units Tape and Reel MAX811, MAX812 PACKAGE DIMENSIONS SOT-143 CASE 318A-05 ISSUE R NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. A L G 3 4 S B 1 F H 2 D J C R K http://onsemi.com 7 DIM A B C D F G H J K L R S MILLIMETERS INCHES MIN MAX MIN MAX 2.80 3.04 0.110 0.120 1.20 1.39 0.047 0.055 0.84 1.14 0.033 0.045 0.39 0.50 0.015 0.020 0.79 0.93 0.031 0.037 1.78 2.03 0.070 0.080 0.013 0.10 0.0005 0.004 0.08 0.15 0.003 0.006 0.46 0.60 0.018 0.024 0.445 0.60 0.0175 0.024 0.72 0.83 0.028 0.033 2.11 2.48 0.083 0.098 MAX811, MAX812 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. 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