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 µsec 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 17µA (VCC = 3.3V) makes these devices suitable for battery powered applications. http://onsemi.com SOT–23 (TO–236) CASE 318 PIN CONFIGURATION (Top View) Features • Precision VCC Monitor for 3.0V, 3.3V, and 5.0V Supplies • 140msec Guaranteed Minimum RESET, RESET • • • • • • GND Output Duration RESET Output Guaranteed to VCC = 1.0V (MAX809) Low 17µA Supply Current VCC Transient Immunity Small SOT–23 Package No External Components Wide Operating Temperature: –40°C to 85°C 3 RESET (RESET)** ORDERING INFORMATION Device VCC RESET GND 2 NOTE: *SOT–23 is equivalent to JEDEC (TO–236) ** RESET is for MAX809 ** RESET is for MAX810 TYPICAL APPLICATION DIAGRAM MAX809 VCC SOT–23* Typical Applications • Computers • Embedded Systems • Battery Powered Equipment • Critical µP Power Supply Monitoring VCC 1 VCC PROCESSOR Package Shipping MAX809xTR SOT–23 3000 Tape/Reel MAX810xTR SOT–23 3000 Tape/Reel NOTE: The ”x” denotes a suffix for VCC threshold – see table below RESET INPUT Suffix GND L M J* T S R Reset VCC Threshold (V) 4.63 4.38 4.00 3.08 2.93 2.63 NOTE: *J version is available for MAX809 only Semiconductor Components Industries, LLC, 1999 February, 2000 – Rev. 2 1 Publication Order Number: MAX809/D MAX809, MAX810 ABSOLUTE MAXIMUM RATINGS* Symbol Parameter Value Unit 6.0 V –0.3 to (VCC + 0.3) V Input Current, VCC 20 mA Output Current, RESET, RESET 20 mA dV/dt (VCC) 100 V/µsec Power Dissipation (TA ≤ 70°C) SOT–23 (derate 4mW/°C above +70°C) 230 Supply Voltage (VCC to GND) RESET, RESET PD mW TA Operating Temperature Range –40 to +85 °C Tstg Storage Temperature Range –65 to +150 °C Tsol Lead Temperature (Soldering, 10 Seconds) +260 °C * Maximum Ratings are those values beyond which damage to the device may occur. http://onsemi.com 2 MAX809, MAX810 ELECTRICAL CHARACTERISTICS (VCC = Full Range, TA = –40°C to +85°C 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) Characteristic Min Typ Max VCC Range TA = 0°C to +70°C TA = –40°C to +85°C 1.0 1.2 — — 5.5 5.5 Supply Current MAX8xxL/M/J: VCC < 5.5V MAX8xxR/S/T: VCC < 3.6V — — 24 17 60 50 4.56 4.50 4.31 4.25 3.93 3.89 3.04 3.00 2.89 2.85 2.59 2.55 4.63 — 4.38 — 4.00 — 3.08 — 2.93 — 2.63 — 4.70 4.75 4.45 4.50 4.06 4.10 3.11 3.15 2.96 3.00 2.66 2.70 Reset Threshold Temperature Coefficient — 30 — ppm/°C VCC to Reset Delay VCC = VTH to (VTH – 100mV) — 20 — µsec 140 240 560 msec — — — — — — 0.3 0.4 0.3 0.8 VCC VCC – 1.5 — — — — — — — — 0.3 0.4 0.8 VCC — — Symbol ICC VTH V µA Reset Threshold (Note NO TAG) MAX8xxL: TA = 25°C TA = –40°C to +85°C MAX8xxM: TA = 25°C TA = –40°C to +85°C MAX809J: TA = 25°C TA = –40°C to +85°C MAX8xxT: TA = 25°C TA = –40°C to +85°C MAX8xxS: TA = 25°C TA = –40°C to +85°C MAX8xxR: TA = 25°C TA = –40°C to +85°C V 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 = 50µA VOH V RESET Output Voltage High (MAX809) MAX809R/S/T: VCC > VTH max, ISOURCE = 500µA MAX809L/M/J: VCC > VTH max, ISOURCE = 800µA VOL V RESET Output Voltage Low (MAX810) MAX810R/S/T: VCC = VTH max, ISINK = 1.2mA MAX810L/M/J: VCC = VTH max, ISINK = 3.2mA VOH Unit V RESET Output Voltage High (MAX810) 1.8 < VCC < VTH min, ISOURCE = 150µA V 1. Production testing done at TA = 25°C, over temperature limits guaranteed by design. PIN DESCRIPTION ÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Pin No. Symbol 1 GND Description 2 RESET (MAX809) RESET output remains low while VCC is below the reset voltage threshold, and for 240msec (typ.) after VCC rises above reset threshold 2 RESET (MAX810) RESET output remains high while VCC is below the reset voltage threshold, and for 240msec (typ.) after VCC rises above reset threshold 3 VCC Ground Supply Voltage (typ.) http://onsemi.com 3 MAX809, MAX810 APPLICATIONS INFORMATION VCC Transient Rejection 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. 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 VCC MAX809 RESET VCC R1 100 k GND VTH Overdrive Figure 2. Ensuring RESET Valid to VCC = 0 V MAXIMUM TRANSIENT DURATION ( m sec) Duration Processors With Bidirectional I/O Pins 400 TA = +25° C 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 4.7kW 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 µP, the buffer should be connected as shown with the solid line. 320 240 160 MAX8xxL/M/J 90 MAX8xxR/S/T 0 1 10 100 1000 RESET COMPARATOR OVERDRIVE, (VTH – VCC (mV) BUFFER BUFFERED RESET TO OTHER SYSTEM COMPONENTS VCC Figure 1. Maximum Transient Duration vs. Overdrive for Glitch Rejection at 25° C VCC MAX809 RESET Signal Integrity During Power–Down 47 k 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 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 valid to VCC = 0V, a pull–down resistor must be connected from RESET to ground to discharge stray capacitances and RESET GND VCC mP RESET GND Figure 3. Interfacing to Bidirectional Reset I/O http://onsemi.com 4 MAX809, MAX810 TYPICAL CHARACTERISTICS 35 30 VCC = 5 V VCC = 5 V 25 SUPPLY CURRENT ( mA) SUPPLY CURRENT ( mA) 30 25 20 VCC = 3 V 15 10 20 10 0 –40 –20 0 20 40 TEMPERATURE (C°) 60 VCC = 1 V 5 VCC = 1 V 5 VCC = 3 V 15 0 –40 85 –20 Figure 4. Supply Current vs Temperature (No Load, MAX8xxR/S/T) 80 VOD = 10 mV 40 20 0 –40 VOD = 100 mV VOD = 200 mV –20 0 20 40 TEMPERATURE (C°) 60 VOD = VTH – VCC 120 VOD = 10 mV 100 80 40 VOD = 100 mV 20 0 –40 85 VOD = 200 mV –20 0 20 40 TEMPERATURE (C°) 60 85 Figure 7. Power–Down Reset Delay vs Temperature and Overdrive (MAX8xxL/M/J) 250 1.003 NORMALIZED THRESHOLD POWER–UP RESET TIMEOUT (msec) VOD = 20 mV 60 Figure 6. Power–Down Reset Delay vs Temperature and Overdrive (MAX8xxR/S/T) 245 MAX8xxL/M/J 240 235 MAX8xxR/S/T 230 225 –40 85 140 VOD = VTH – VCC VOD = 10 mV 60 60 Figure 5. Supply Current vs Temperature (No Load, MAX8xxL/M/J/) POWER–DOWN RESET DELAY ( m sec) POWER–DOWN RESET DELAY ( m sec) 100 0 20 40 TEMPERATURE (C°) 1.002 1.001 1.000 0.999 0.998 0.997 –20 0 20 40 TEMPERATURE (C°) 60 85 –40 Figure 8. Power–Up Reset Timeout vs Temperature –20 0 20 40 TEMPERATURE (C°) 60 Figure 9. Normalized Reset Threshold vs Temperature http://onsemi.com 5 85 MAX809, MAX810 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 DIAGRAM SOT–23 x x Y W YW = Date Code MARKING ÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁ ON Semiconductor Part # Reset Threshold or Address Marking MAX809L 4.63 J1YW MAX809M 4.38 J2YW MAX809T 3.08 J3YW MAX809S 2.93 J4YW MAX809R 2.63 J5YW MAX809J 4.00 J6YW MAX810L 4.63 K1YW MAX810M 4.38 K2YW MAX810T 3.08 K3YW MAX810S 2.93 K4YW MAX810R 2.63 K5YW YW = Date code http://onsemi.com 6 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 B S 1 V 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, MAX810 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. 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