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| MAX809, MAX810 3-Pin Microprocessor Reset Monitors The MAX809 and MAX810 are cost-effective system supervisor circuits 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 20 sec of VCC falling through the reset voltage threshold. Reset is maintained active for a minimum of 140msec after VCC rises above the reset threshold. The MAX810 has an active-high RESET output while the MAX809 has an active-low RESET output. The output of the MAX809 is guaranteed valid down to VCC = 1V. Both devices are available in a SOT-23 package. The MAX809/810 are optimized to reject fast transient glitches on the VCC line. Low supply current of 17A (VCC = 3.3V) makes these devices suitable for battery powered applications. SOT-23 (TO-236) CASE 318 * Precision VCC Monitor for 3.0V, 3.3V, and 5.0V Supplies * 140msec Guaranteed Minimum RESET, RESET * * * * * * Output Duration RESET Output Guaranteed to VCC = 1.0V (MAX809) Low 17A Supply Current VCC Transient Immunity Small SOT-23 Package No External Components Wide Operating Temperature: -40C to 85C Features PIN CONFIGURATION (Top View) GND 1 3 RESET (RESET)** VCC 2 SOT-23* NOTE: *SOT-23 is equivalent to JEDEC (TO-236) ** RESET is for MAX809 ** RESET is for MAX810 Typical Applications * Computers * Embedded Systems * Battery Powered Equipment * Critical P Power Supply Monitoring TYPICAL APPLICATION DIAGRAM VCC VCC MAX809 RESET VCC PROCESSOR RESET INPUT GND ORDERING INFORMATION Device MAX809xTR MAX810xTR Package SOT-23 SOT-23 Shipping 3000 Tape/Reel 3000 Tape/Reel NOTE: The "x" denotes a suffix for VCC threshold - see table below Suffix L M J* T S R Reset VCC Threshold (V) 4.63 4.38 4.00 3.08 2.93 2.63 GND NOTE: *J version is available for MAX809 only 1 MAX809, MAX810 MAX809, MAX810 ABSOLUTE MAXIMUM RATINGS* Symbol Parameter Supply Voltage (VCC to GND) RESET, RESET Input Current, VCC Output Current, RESET, RESET dV/dt (VCC) PD TA Tstg Tsol Power Dissipation (TA 70C) SOT-23 (derate 4mW/C above +70C) Operating Temperature Range Storage Temperature Range Lead Temperature (Soldering, 10 Seconds) Value 6.0 -0.3 to (VCC + 0.3) 20 20 100 230 -40 to +85 -65 to +150 +260 C C C Unit V V mA mA V/sec mW * Maximum Ratings are those values beyond which damage to the device may occur. 2 MAX809, MAX810 MAX809, MAX810 ELECTRICAL CHARACTERISTICS (VCC = Full Range, TA = -40C to +85C unless otherwise noted. typical values are at TA = +25C, VCC = 5V for L/M/J, 3.3V for T/S, 3.0V for R) (Note NO TAG) Symbol VCC Range TA = 0C to +70C TA = -40C to +85C ICC Supply Current MAX8xxL/M/J: VCC < 5.5V MAX8xxR/S/T: VCC < 3.6V Reset Threshold (Note NO TAG) MAX8xxL: TA = 25C TA = -40C to +85C MAX8xxM: TA = 25C TA = -40C to +85C MAX809J: TA = 25C TA = -40C to +85C MAX8xxT: TA = 25C TA = -40C to +85C MAX8xxS: TA = 25C TA = -40C to +85C MAX8xxR: TA = 25C TA = -40C to +85C Reset Threshold Temperature Coefficient VCC to Reset Delay VCC = VTH to (VTH - 100mV) Reset Active Timeout Period VOL RESET Output Voltage Low (MAX809) MAX809R/S/T: VCC = VTH min, ISINK = 1.2mA MAX809L/M/J: VCC = VTH min, ISINK = 3.2mA VCC > 1.0V, ISINK = 50A RESET Output Voltage High (MAX809) MAX809R/S/T: VCC > VTH max, ISOURCE = 500A MAX809L/M/J: VCC > VTH max, ISOURCE = 800A RESET Output Voltage Low (MAX810) MAX810R/S/T: VCC = VTH max, ISINK = 1.2mA MAX810L/M/J: VCC = VTH max, ISINK = 3.2mA RESET Output Voltage High (MAX810) 1.8 < VCC < VTH min, ISOURCE = 150A Characteristic Min 1.0 1.2 -- -- 4.56 4.50 4.31 4.25 3.93 3.89 3.04 3.00 2.89 2.85 2.59 2.55 -- -- 140 -- -- -- 0.8 VCC VCC - 1.5 -- -- 0.8 VCC Typ -- -- 24 17 4.63 -- 4.38 -- 4.00 -- 3.08 -- 2.93 -- 2.63 -- 30 20 240 -- -- -- -- -- -- -- -- Max 5.5 5.5 A 60 50 V 4.70 4.75 4.45 4.50 4.06 4.10 3.11 3.15 2.96 3.00 2.66 2.70 -- -- 560 0.3 0.4 0.3 V -- -- V 0.3 0.4 V -- ppm/C sec msec V Unit V VTH VOH VOL VOH 1. Production testing done at TA = 25C, over temperature limits guaranteed by design. PIN DESCRIPTION AAAAAAAAAAAAAAAAAAAAAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAA A A A A A A AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAA A 1 2 2 3 GND Ground RESET (MAX809) RESET output remains low while VCC is below the reset voltage threshold, and for 240msec (typ.) after VCC rises above reset threshold RESET (MAX810) VCC RESET output remains high while VCC is below the reset voltage threshold, and for 240msec (typ.) after VCC rises above reset threshold Supply Voltage (typ.) 3 Pin No. Symbol Description MAX809, MAX810 MAX809, MAX810 APPLICATIONS INFORMATION VCC Transient Rejection The MAX809/810 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 which lies 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 MAX809/810. VCC VTH Overdrive 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 (100kW will be suitable for most applications). Similarly, a pull-up resistor to VCC is required for the MAX810 to ensure a valid high RESET for VCC below 1.0V. VCC VCC MAX809 RESET R1 100 k GND Duration MAXIMUM TRANSIENT DURATION ( m sec) 400 TA = +25 C Figure 2. Ensuring RESET Valid to VCC = 0 V Processors With Bidirectional I/O Pins 320 240 160 MAX8xxL/M/J 90 0 1 MAX8xxR/S/T 10 100 1000 RESET COMPARATOR OVERDRIVE, (VTH - VCC (mV) Some P'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 4.7kW resistor in series with the output of the MAX809/810 (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. BUFFER VCC Figure 1. Maximum Transient Duration vs. Overdrive for Glitch Rejection at 25 C RESET Signal Integrity During Power-Down BUFFERED RESET TO OTHER SYSTEM COMPONENTS VCC 47 k RESET VCC MAX809 mP The MAX809 RESET output is valid to VCC = 1.0V. 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 = 0V, a pull-down resistor must be connected from RESET to ground to discharge stray capacitances and RESET GND GND Figure 3. Interfacing to Bidirectional Reset I/O 4 MAX809, MAX810 MAX809, MAX810 TYPICAL CHARACTERISTICS 35 30 SUPPLY CURRENT ( mA) 25 20 15 10 5 0 -40 VCC = 1 V VCC = 3 V VCC = 5 V SUPPLY CURRENT ( mA) 30 VCC = 5 V 25 20 15 10 5 0 -40 VCC = 1 V VCC = 3 V -20 0 20 40 TEMPERATURE (C) 60 85 -20 0 20 40 TEMPERATURE (C) 60 85 Figure 4. Supply Current vs Temperature (No Load, MAX8xxR/S/T) Figure 5. Supply Current vs Temperature (No Load, MAX8xxL/M/J/) 100 POWER-DOWN RESET DELAY ( m sec) 80 60 40 20 0 -40 POWER-DOWN RESET DELAY ( m sec) VOD = VTH - VCC VOD = 10 mV 140 VOD = VTH - VCC 120 VOD = 10 mV 100 80 60 40 20 0 -40 VOD = 200 mV -20 0 20 40 TEMPERATURE (C) 60 85 VOD = 100 mV VOD = 20 mV VOD = 10 mV VOD = 100 mV VOD = 200 mV -20 0 20 40 TEMPERATURE (C) 60 85 Figure 6. Power-Down Reset Delay vs Temperature and Overdrive (MAX8xxR/S/T) Figure 7. Power-Down Reset Delay vs Temperature and Overdrive (MAX8xxL/M/J) POWER-UP RESET TIMEOUT (msec) 250 NORMALIZED THRESHOLD 245 MAX8xxL/M/J 240 235 230 225 -40 MAX8xxR/S/T 1.003 1.002 1.001 1.000 0.999 0.998 0.997 -20 0 20 40 TEMPERATURE (C) 60 85 -40 -20 0 20 40 TEMPERATURE (C) 60 85 Figure 8. Power-Up Reset Timeout vs Temperature Figure 9. Normalized Reset Threshold vs Temperature 5 AAAAAAAAAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AAAAAAAAAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AAAAAAAAAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAA A YW = Date code MARKING DIAGRAM TAPING FORM MARKING MAX810R MAX810S MAX810T MAX810M MAX810L MAX809J MAX809R MAX809S MAX809T MAX809M MAX809L ON Semiconductor Part # Tape & Reel Specifications Table Package SOT-23 x YW = Date Code Component Taping Orientation for 3L SOT-23 (JEDEC-236) Devices x SOT-23 PIN 1 Y DEVICE MARKING Carrier Width (W) W 8 mm Standard Reel Component Orientation (Mark Right Side Up) Reset Threshold or Address MAX809, MAX810 USER DIRECTION OF FEED 2.63 2.93 3.08 4.38 4.63 4.00 2.63 2.93 3.08 4.38 4.63 Pitch (P) 4 mm 6 Part Per Full Reel 3000 MAX809, MAX810 Reel Size 7 inches Marking K5YW K4YW K3YW K2YW K1YW J6YW J5YW J4YW J3YW J2YW J1YW MAX809, MAX810 MAX809, MAX810 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 BS 1 2 V G C D H K J 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 7 |
Price & Availability of MAX810
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