CAX803, CAX809, CAX810 3-Pin Microprocessor Power Supply Supervisors Description The CAX803, CAX809, and CAX810 are supervisory circuits that monitor power supplies in digital systems. The CAX803, CAX809, and CAX810 are direct replacements for the MAX803, MAX809 and MAX810 in applications operating over the industrial temperature range. These devices generate a reset signal, which is asserted while the power supply voltage is below a preset threshold level and for at least 140 ms after the power supply level has risen above that level. The underlying floating gate technology, Analog EEPROM used by ON Semiconductor, makes it possible to offer any custom reset threshold value. Seven industry standard threshold levels are offered to support +5.0 V, +3.3 V, +3.0 V and +2.5 V systems. The CAX803 has an open−drain RESET output (active LOW). The CAX803 requires a pull−up resistor on the reset output. The CAX809 features a push−pull RESET output (active LOW) and the CAX810 features a push−pull RESET output (active HIGH). Fast transients on the power supply are ignored and the output is guaranteed to be in the correct state at VCC levels as low as 1.0 V. The CAX803, CAX809, and CAX810 are available in the compact 3−pin SOT−23 package. Features http://onsemi.com SOT−23 TB SUFFIX CASE 527AG PIN CONFIGURATION 1 3 VCC 2 • • • • • • • CAX803 CAX809 (CAX810) RESET (RESET) (Top View) • Precision Monitoring of • 3−Lead SOT23 GND +5.0 V (−5%, −10%, −20%), +3.3 V (−5%, −10%), +3.0 V (−10%) and +2.5 V (−5%) Power Supplies Offered in Three Output Configurations: − CAX803: Open−Drain Active LOW Reset − CAX809: Push−Pull Active LOW Reset − CAX810: Push−Pull Active HIGH Reset Direct Replacements for the MAX803, MAX809 and MAX810 in Applications Operating over the Industrial Temperature Range Reset Valid down to VCC = 1.0 V 10 mA Power Supply Current Power Supply Transient Immunity Industrial Temperature Range: −40°C to +85°C Available in SOT−23 Package These Devices are Pb−Free and are RoHS Compliant MARKING DIAGRAMS XXXMG G SOT−23 XXX M G = Specific Device Code = Month Code = Pb−Free Package (*Note: Microdot may be in either location) ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 9 of this data sheet. Applications • • • • • • Computers, Servers, Laptops, Cable Modems Wireless Communications Embedded Control Systems White Goods, Power Meters Intelligent Instruments PDAs and Handheld Equipment © Semiconductor Components Industries, LLC, 2012 October, 2012 − Rev. 1 1 Publication Order Number: CAX803/D CAX803, CAX809, CAX810 Table 1. THRESHOLD SUFFIX SELECTOR Nominal Threshold Voltage Threshold Suffix Designation 4.63 V L 4.55 V H 4.38 V M 4.00 V J 3.08 V T 2.93 V S 2.63 V R 2.32 V Z Table 2. PIN DESCRIPTIONS Pin Number CAX803 CAX809 CAX810 Name 1 1 1 GND 2 2 − RESET Active LOW reset. RESET is asserted if VCC falls below the reset threshold and remains low for at least 140 ms after VCC rises above the reset threshold. − − 2 RESET Active HIGH reset. RESET is asserted if VCC falls below the reset threshold and remains high for at least 140 ms after VCC rises above the reset threshold. 3 3 3 VCC Description Ground Power supply voltage that is monitored. Table 3. ABSOLUTE MAXIMUM RATINGS Parameter Rating Units −0.3 to +6.0 V 20 mA Output Current, RESET, RESET 20 mA Rate of Rise, VCC 100 V/ms Continuous Power Dissipation Derate 4 mW/°C above 70°C (SOT23) 320 Any pin with respect to ground Input Current, VCC mW Operating Temperature Range −40 to +85 °C Storage Temperature Range −65 to +105 °C 300 °C Lead Soldering Temperature (10 sec) Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. http://onsemi.com 2 CAX803, CAX809, CAX810 VCC VCC VCC TOLERANCE BIAS + RESET DIGITAL DELAY – VOLTAGE REFERENCE CAX803 GND VCC VCC VCC TOLERANCE BIAS + DIGITAL DELAY – VOLTAGE REFERENCE RESET CAX809 GND VCC VCC VCC TOLERANCE BIAS + DIGITAL DELAY – VOLTAGE REFERENCE RESET CAX810 GND Figure 1. Block Diagrams http://onsemi.com 3 CAX803, CAX809, CAX810 Table 4. ELECTRICAL CHARACTERISTICS (VCC = Full range, TA = −40°C to +85°C, unless otherwise specified. Typical values at TA = +25°C and VCC = 5 V for the L/H/M/J versions, VCC = 3.3 V for the T/S versions, VCC = 3 V for the R version and VCC = 2.5 V for the Z/V versions.) Symbol Parameter VCC Range ICC VTH Supply Current Reset Threshold Voltage Conditions Min V 5.5 TA = −40°C to +85°C 1.2 5.5 TA = −40°C to +85°C VCC < 5.5 V, J/L/M/H 15 25 VCC < 3.6 V, R/S/T/Z/V 10 15 L Threshold TA = +25°C 4.56 4.63 4.70 TA = −40°C to +85°C 4.50 TA = +25°C 4.48 TA = −40°C to +85°C 4.43 TA = +25°C 4.31 TA = −40°C to +85°C 4.25 TA = +25°C 3.93 TA = −40°C to +85°C 3.89 TA = +25°C 3.04 TA = −40°C to +85°C 3.00 TA = +25°C 2.89 TA = −40°C to +85°C 2.85 TA = +25°C 2.59 TA = −40°C to +85°C 2.55 TA = +25°C 2.28 TA = −40°C to +85°C 2.25 J Threshold T Threshold S Threshold R Threshold Z Threshold Reset Threshold Tempco TD VCC to Reset Delay (Note 2) VCC = VTH to (VTH − 100 mV) TR Reset Active Timeout Period TA = −40°C to +85°C VOL RESET Output Voltage Low (Open−drain active LOW, CAX803 and push−pull, active LOW, CAX809) VOH Units 1.0 M Threshold VOL Max TA = 0°C to +70°C H Threshold VOH Typ (Note 1) 140 mA V 4.75 4.55 4.62 4.67 4.38 4.45 4.50 4.00 4.06 4.10 3.08 3.11 3.15 2.93 2.96 3.00 2.63 2.66 2.70 2.32 2.35 2.38 30 ppm/°C 20 ms 240 460 ms VCC = VTH min, ISINK = 1.2 mA CAX803R/S/T/Z, CAX809R/S/T/Z/V 0.3 V VCC = VTH min, ISINK = 3.2 mA CAX803J/L/M, CAX809J/L/M/H 0.4 VCC > 1.0 V, ISINK = 50 mA 0.3 RESET Output Voltage High (Push−pull, active LOW, CAX809) VCC = VTH max, ISOURCE = 500 mA CAX809R/S/T/Z/V 0.8 VCC VCC = VTH max, ISOURCE = 800 mA CAX809J/L/M/H VCC − 1.5 RESET Output Voltage Low (Push−pull, active HIGH, CAX810) VCC > VTH max, ISINK = 1.2 mA CAX810R/S/T/Z 0.3 VCC > VTH max, ISINK = 3.2 mA CAX810J/L/M 0.4 RESET Output Voltage High (Push−pull, active HIGH, CAX810) 1.8 V < VCC VTH min, ISOURCE = 150 mA 1. Production testing done at TA = +25°C; limits over temperature guaranteed by design only. 2. RESET output for the CAX809; RESET output for the CAX810. http://onsemi.com 4 0.8 VCC V V V CAX803, CAX809, CAX810 TYPICAL OPERATING CHARACTERISTICS (VCC = Full range, TA = −40°C to +85°C, unless otherwise specified. Typical values at TA = +25°C and VCC = 5 V for the L/M/J versions, VCC = 3.3 V for the T/S versions, VCC = 3 V for the R version and VCC = 2.5 V for the Z version.) NORMALIZED SUPPLY CURRENT (mA) VCC = 5 V 240 220 VCC = 2.5 V 200 180 160 −50 0 50 100 150 1.9 1.6 1.3 1.0 0.7 0.4 0 −50 50 100 150 TEMPERATURE (°C) Figure 2. Power−up Reset Timeout vs. Temperature Figure 3. Supply Current vs. Temperature (No Load, CAX8xxR/S/T/Z) 14 1.0002 12 1.0000 10 8 6 4 2 0 −50 0 TEMPERATURE (°C) NORMALIZED THRESHOLD POWER−DOWN RESET DELAY (mS) POWER−UP RESET TIMEOUT (mS) 260 0 50 100 0.9998 0.9996 0.9994 0.9992 0.9990 0.9988 150 0 20 40 60 80 100 TEMPERATURE (°C) TEMPERATURE (°C) Figure 4. Power−down Reset Delay vs. Temperature (CAX8xxR/S/T/Z) Figure 5. Normalized Reset Threshold vs. Temperature http://onsemi.com 5 120 CAX803, CAX809, CAX810 Detailed Descriptions Reset Timing The reset signal is asserted LOW for the CAX803/CAX809 and HIGH for the CAX810 when the power supply voltage falls below the threshold trip voltage and remains asserted for at least 140 ms after the power supply voltage has risen above the threshold. 5V VTH VCC 0V TR TD Reset Timeout Period (140 ms minimum) 5V RESET/OUT CAX803, CAX809 0V 5V RESET CAX810 0V Figure 6. Reset Timing Diagram 30 VCC Transient Response TAMB = 25°C TRANSIENT DURATION (ms) The CAX803/CAX809/CAX810 protect mPs against brownout failure. Short duration transients of 4 msec or less and 100 mV amplitude typically do not cause a false RESET. Figure 7 shows the maximum pulse duration of negative− going VCC transients that do not cause a reset condition. As the amplitude of the transient goes further below the threshold (increasing VTH − VCC), the maximum pulse duration decreases. In this test, the VCC starts from an initial voltage of 0.5 V above the threshold and drops below it by the amplitude of the overdrive voltage (VTH − VCC). 25 20 15 CAX809Z 10 CAX809M 5 0 1 10 100 1000 RESET OVERDRIVE VTH − VCC (mV) Figure 7. Maximum Transient Duration without Causing a Reset Pulse vs. Reset Comparator Overdrive http://onsemi.com 6 CAX803, CAX809, CAX810 Valid RESET with VCC Under 1.0 V To ensure that the CAX809 RESET pin is in a known state when VCC is under 1.0 V, a >10 kW pull−down resistor between RESET pin and GND is recommended. For the CAX810, a pull−up resistor from RESET pin to VCC is needed. Power Supply Power Supply VCC VCC 10 kW CAX810 CAX809 RESET RESET 10 kW GND GND Figure 8. RESET Valid with VCC Under 1.0 V Figure 9. RESET Valid with VCC Under 1.1 V Bi−directional Reset Pin Interfacing The CAX809/810 can interface with mP/mC bi−directional reset pins by connecting a 4.7 kW resistor in series with the CAX809/810 reset output and the mP/mC bi−directional reset pin. BUF Power Supply Buffered RESET VCC VCC CAX809 mP 4.7 kW (For example: 68HC11) RESET INPUT RESET GND GND Bi−directional I/O Pin Figure 10. Bi−directional Reset Pin Interfacing CAX803 Open−Drain RESET Application Power Supply The CAX803 features an open−drain RESET output and therefore needs a pull−up resistor on the output for proper operation, as shown on Figure 11. An advantage of the open−drain output includes the ability to “wire AND” several outputs together to form an inexpensive logic circuit. It is also possible to have the pull−up resistor connected to a different supply which can be higher than the CAX803 VCC pin. The value of the pull−up resistor is not critical in most applications, typical values being between 5 kW and 10 kW. VCC 5 kW CAX803 VCC mP RESET GND RESET INPUT GND Figure 11. Typical CAX803 Open−Drain Circuit Configuration http://onsemi.com 7 CAX803, CAX809, CAX810 PACKAGE DIMENSIONS SOT−23, 3 Lead CASE 527AG−01 ISSUE O MIN SYMBOL D 3 E1 1 E 2 e e1 A 0.89 1.12 0.013 0.10 b 0.37 0.50 c 0.085 0.18 D 2.80 3.04 E 2.10 2.64 E1 1.20 1.40 e 0.95 BSC e1 1.90 BSC L 0.40 REF 0.54 REF 0º θ A MAX A1 L1 TOP VIEW NOM 8º q b L1 A1 SIDE VIEW L END VIEW Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC TO-236. http://onsemi.com 8 c CAX803, CAX809, CAX810 Table 5. ORDERING PART NUMBER Order Number Voltage CAX803LTBI−T3 4.63 V CAX803MTBI−T3 4.38 V CAX803JTBI−T3 4.00 V CAX803TTBI−T3 3.08 V CAX803STBI−T3 2.93 V CAX803RTBI−T3 2.63 V CAX803ZTBI−T3 2.32 V CAX809LTBI−T3 4.63 V CAX809HTBI−T3 4.55 V CAX809MTBI−T3 4.38 V CAX809JTBI−T3 4.00 V CAX809TTBI−T3 3.08 V CAX809STBI−T3 2.93 V CAX809RTBI−T3 2.63 V CAX809ZTBI−T3 2.32 V CAX810LTBI−T3 4.63 V CAX810MTBI−T3 4.38 V CAX810JTBI−T3 4.00 V CAX810TTBI−T3 3.08 V CAX810STBI−T3 2.93 V CAX810RTBI−T3 2.63 V CAX810ZTBI−T3 2.32 V Top Mark (Note 3) Output Reset Package Quantity per Reel (Note 4) VKL Open Drain LOW SOT−23−3 3,000 VLD CMOS / Push−Pull LOW SOT−23−3 3,000 VHT CMOS / Push−Pull HIGH SOT−23−3 3,000 3. Threshold and full part numbers will be provided on box and reel labels as well as all Shipping documents. 4. For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. 5. 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