CAT859

CAT853, CAT863 CATCAT859, CAT869 3-Pin Microprocessor Power Supply Supervisors FEATURES Precision monitoring of +3.3 V (-5%, -10%), 5 V (-10% Power Supplies) Active low reset output Reset valid down to VCC = 1.0 V 6 µA power supply current Power supply transient immunity Industrial temperature range: -40ºC to +85ºC RoHS-compliant SOT-23 package DESCRIPTION The CAT853, CAT863, CAT859, and CAT869 are supervisory circuits that monitor power supplies in digital systems. 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. Industry standard threshold levels are offered to support +3.3 V or 5.0 V systems. ¯¯¯¯¯¯ The CAT859 and CAT869 feature a RESET push-pull output (active low) for the two pinout options. The CAT853 and CAT863 feature an open drain ¯¯¯¯¯¯ RESET output (active low). Both require a pull-up resistor on the RESET output. 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. APPLICATIONS Computers Servers Laptops Cable modems Wireless communications Embedded control systems White goods Power meters Intelligent instruments PDAs and handheld equipment For Ordering Information details, see page 9. PIN CONFIGURATION SOT-23 3-Lead RESET 1 RESET THRESHOLD SUFFIX SELECTOR SOT-23 3-Lead 1 Nominal Threshold Voltage 4.38 V 4.20 V 3.08 V 2.93 V 2.4 V Threshold Suffix Designation M F T S C CAT853 CAT859 GND 2 3 VCC VCC 2 CAT863 CAT869 3 GND PIN DESCRIPTION Pin Name ¯¯¯¯¯¯ RESET GND VCC Function ¯¯¯¯¯¯ 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 Ground Power supply voltage that is monitored © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice 1 Doc. No. MD-3026, Rev. G CAT853, CAT863, CAT859, CAT869 BLOCK DIAGRAMS VCC VCC VCC TOLERANCE BIAS + – DIGITAL DELAY RESET VOLTAGE REFERENCE GND CAT853 CAT863 VCC VCC TOLERANCE BIAS VCC + – DIGITAL DELAY RESET VOLTAGE REFERENCE GND CAT859 CAT869 Doc. No. MD-3026, Rev. G 2 © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice CAT853, CAT863, CAT859, CAT869 ABSOLUTE MAXIMUM RATINGS (1) Parameters Any pin with respect to ground Input Current, VCC ¯¯¯¯¯¯ Output Current, RESET Rate of Rise, VCC Continuous Power Dissipation Derate 4mW/ºC above 70ºC (SOT23) Operating Temperature Range Storage Temperature Range Lead Soldering Temperature (10 sec) Ratings -0.3 to +6.0 20 20 100 320 -40 to +85 -65 to +105 300 Units V mA mA V/µs mW ºC ºC ºC ELECTRICAL CHARACTERISTICS VCC = Full range, TA = -40ºC to +85ºC unless otherwise noted. Typical values at TA = +25ºC and VCC = 3.3 V for the C, S, T versions, VCC = 5 V for the M version. Symbol Parameter VCC Range ICC Supply Current Conditions TA = 0ºC to +70ºC TA = -40ºC to +85ºC TA = -40ºC to +85ºC M Threshold F Threshold VTH Reset Threshold Voltage T Threshold S Threshold C Threshold Reset Threshold Tempco VCC to Reset Delay Reset Active Timeout Period VOL VOH ¯¯¯¯¯¯ RESET Output Voltage Low ¯¯¯¯¯¯ RESET Output Voltage High VCC = VTH to (VTH - 100 mV) TA = -40ºC to +85ºC VCC = VTH min, ISINK = 1.2 mA VCC > 1.0 V, ISINK = 50 µA VCC = VTH max, ISOURCE = -500 µA (for CAT859/869 only) 0.8 VCC 140 VCC < 3.6 V, C, S, T TA = +25ºC TA = -40ºC to +85ºC TA = +25ºC TA = -40ºC to +85ºC TA = +25ºC TA = -40ºC to +85ºC TA = +25ºC TA = -40ºC to +85ºC TA = +25ºC TA = -40ºC to +85ºC 4.31 4.25 4.14 4.08 3.04 3.00 2.89 2.85 2.35 2.30 30 20 240 460 0.4 0.3 2.40 2.93 3.08 4.20 Min 1.0 1.2 6 4.38 Typ (2) Max 5.5 5.5 15 4.45 4.50 4.26 4.31 3.11 3.15 2.96 3.00 2.45 2.50 Units V µA V ppm/ºC µs ms V V Notes: (1) Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions outside of those listed in the operational sections of this specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability. (2) Production testing done at TA = +25ºC; limits over temperature guaranteed by design only. © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice 3 Doc. No. MD-3026, Rev. G CAT853, CAT863, CAT859, CAT869 TYPICAL ELECTRICAL OPERATING CHARACTERISTICS VCC = Full range, TA = -40ºC to +85ºC unless otherwise noted. Typical values at TA = +25ºC and VCC = 3.3 V for the C, S, T versions, VCC = 5 V for the M version. POWER-UP RESET TIMEOUT VS. TEMPERATURE SUPPLY CURRENT VS. TEMPERATURE (NO LOAD) 12 POWER-UP RESET TIMEOUT (ms) 260 SUPPLY CURRENT (µA) 240 220 200 VCC = 5 V 10 8 6 4 2 0 VCC = 5.5 V VCC = 3.6 V VCC = 2.5 V 180 160 -50 0 50 100 150 TEMPERATURE (°C) -50 0 50 100 150 TEMPERATURE (°C) POWER-DOWN RESET DELAY VS. TEMPERATURE NORMALIZED RESET THRESHOLD VS. TEMPERATURE 1.0002 POWER-DOWN RESET DELAY (µs) NORMALIZED THRESHOLD 14 12 10 8 6 4 2 0 -50 0 50 100 150 TEMPERATURE (°C) 1 0.9998 0.9996 0.9994 0.9992 0.999 0.9988 0 20 40 60 80 100 120 TEMPERATURE (°C) Doc. No. MD-3026 Rev. G 4 © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice CAT853, CAT863, CAT859, CAT869 DETAILED DESCRIPTION RESET TIMING The reset signal is asserted low for the CAT853, CAT863, CAT859, and CAT869 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. Threshold Voltage Reset Timeout Period 140 ms minimum Power 5 V Supply Voltage 0 V RESET 5V 0V Figure 1. Reset Timing Diagram VCC TRANSIENT RESPONSE The CAT853, CAT863, CAT859, and CAT869 protect µPs against brownout failure. Short duration transients of 4 µs or less and 100 mV amplitude typically do not cause a false RESET. Figure 2 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). TRANSIENT DURATION [s] TAMB = 25ºC “C” THRESHOLD “M” THRESHOLD RESET OVERDRIVE V TH - VCC [mV] Figure 2. Maximum Transient Duration Without Causing a Reset Pulse vs. Reset Comparator Overdrive © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice 5 Doc. No. MD-3026, Rev. G CAT853, CAT863, CAT859, CAT869 VALID RESET WITH VCC UNDER 1.0 V ¯¯¯¯¯¯ To ensure that the CAT859 and CAT869 RESET pin is in a known state when VCC is under 1.0 V, a > 10 kΩ ¯¯¯¯¯¯ pull-down resistor between RESET pin and GND is recommended. Power Supply VCC CAT8x9 RESET GND ¯¯¯¯¯¯ Figure 3. RESET Valid with VCC Under 1.0 V BI-DIRECTIONAL RESET PIN INTERFACING The CAT859 and CAT869 can interface with µP/µC bi-directional reset pins by connecting a 4.7 kΩ resistor in series with the CAT859 and CAT869 reset output and the µP/µC bi-directional reset pin. BUF Power Supply VCC VCC Buffered RESET CAT8x9 RESET GND RESET INPUT Bi-directional I/O Pin µP (For example: 68HC11) GND Figure 4. Bi-directional Reset Pin Interfacing Doc. No. MD-3026 Rev. G 6 © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice CAT853, CAT863, CAT859, CAT869 ¯¯¯¯¯¯ CAT853 AND CAT863 OPEN-DRAIN RESET APPLICATION The CAT853 and CAT863 features an open-drain RESET output and therefore need a pull-up resistor on the output for proper operation, as shown on Figure 5. 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 CAT8x3 VCC pin. The value of the pull-up resistor is not critical in most applications, typical values being between 5 kΩ and 10 kΩ. Power Supply VCC 5kΩ VCC CAT8x3 RESET GND RESET INPUT µP GND Figure 5. Typical CAT8x3 Open-Drain Circuit Configuration © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice 7 Doc. No. MD-3026, Rev. G CAT853, CAT863, CAT859, CAT869 PACKAGE OUTLINE DRAWING SOT-23 3-LEAD (TB) (1)(2) D 3 SYMBOL MIN NOM MAX A A1 b c E1 E 0.89 0.013 0.37 0.085 2.80 2.10 1.20 0.95 BSC 1.90 BSC 0.400 REF 0.540 REF 0º 1.12 0.10 0.50 0.18 3.04 2.64 1.40 D E E1 e e1 L L1 θ 1 e e1 TOP VIEW 2 8º A θ b A1 L1 L c SIDE VIEW END VIEW Notes: (1) All dimensions in millimeters. Angles in degrees. (2) Complies with JEDEC standard TO-236. Doc. No. MD-3026 Rev. G 8 © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice CAT853, CAT863, CAT859, CAT869 EXAMPLE OF ORDERING INFORMATION Prefix CAT Company ID Device Type (1) (2) (3) Device # 859 Suffix S Threshold Level M: 4.38 V F: 4.20 V T: 3.08 V S: 2.93 V C: 2.40 V TB I -G Lead Finish G:NiPdAu T10 Tape & Reel T: Tape & Reel 3: 3,000/Reel 10: 10,000/Reel 853: Open Drain / Active Low Output 863: Open Drain / Active Low Output 859: Push-Pull / Active Low Output 869: Push-Pull / Active Low Output Temperature Range I = Industrial (-40ºC to 85ºC) Package TB: SOT-23 (1) TOP MARKING Part and Threshold CAT859C CAT859T CAT859S CAT859F CAT859M CAT869T CAT869S CAT869M SOT-23 RoHS (4) (5) NiPdAu Finish Part and Threshold CAT853C CAT853T CAT853S CAT853F CAT853M CAT863T CAT863S CAT863M SOT-23 RoHS (4) (5) NiPdAu Finish RSYM RUYM RTYM RVYM ORDERING PART NUMBER (6) CAT859CTBI-G CAT859TTBI-G CAT859STBI-G CAT859FTBI-G CAT859MTBI-G CAT869TTBI-G CAT869STBI-G CAT869MTBI-G CAT853CTBI-G CAT853TTBI-G CAT853STBI-G CAT853FTBI-G CAT853MTBI-G CAT863TTBI-G CAT863STBI-G CAT863MTBI-G Notes: (1) All packages are RoHS-compliant (Lead-free, Halogen-free). (2) The device used in the example above is a CAT859STBI-GT10 (Push-Pull / Active Low Output, trip level of 2.85 V to 3.00 V NiPdAu, Tape and Reel). (3) For additional package and temperature options, please contact your nearest ON Semiconductor Sales office. (4) The “YM” in the SOT-23 package marking indicates the Year and Month of production. (5) All NiPdAu devices will be marked to indicate product type. Threshold and full part numbers will be provided on box and reel labels as well as all Shipping documents. (6) For special threshold and package options, contact factory. © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice 9 Doc. No. MD-3026, Rev. G CAT853, CAT863, CAT859, CAT869 REVISION HISTORY Date 11-Oct-06 04-May-07 Rev. A B Description Initial Issue CAT859, CAT869 Added CAT853, CAT863 Update Example of Ordering Information Update Top Marking Update Ordering Part Number Add Threshold Level - C: 2.40 V Update Package Outline Drawing Add MD- to document number Added Block Diagrams Change logo and fine print to ON Semiconductor Convert to MS Word format Add Nominal Threshold Voltage 4.20 “F” 17-Jan-07 30-Jan-08 05-Nov-08 04-Mar-09 08-Apr-09 C D E F G ON Semiconductor and are registered 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. 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This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: orderlit@onsemi.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center: Phone: 81-3-5773-3850 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative Doc. No. MD-3026 Rev. G 10 © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice