CAT853, CAT863 CAT859, CAT869 3-Pin Microprocessor Power Supply Supervisors FEATURES DESCRIPTION ■ Precision monitoring of +3.3V (-5%, -10%), 5V (-10% Power Supplies) ■ Active low reset output ■ Reset valid down to VCC = 1.0V ■ 6μA power supply current ■ Power supply transient immunity ■ Industrial temperature range: -40ºC to +85ºC ■ RoHS-compliant SOT-23 package 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 +3.3V or 5.0V systems. The CAT859 and CAT869 feature a RESET push-pull output (active low) for the two pinout options. APPLICATIONS The CAT853 and CAT863 feature an open drain RESET output (active low). Both require a pull-up resistor on the RESET output. ■ Computers ■ Servers ■ Laptops ■ Cable modems ■ Wireless communications ■ Embedded control systems ■ White goods ■ Power meters ■ Intelligent instruments ■ PDAs and handheld equipment 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 1.0V. For Ordering Information details, see page 8. PIN CONFIGURATION THRESHOLD SUFFIX SELECTOR 3-Lead SOT23 RESET 1 RESET CAT853 CAT859 GND 3-Lead SOT23 3 1 CAT863 CAT869 VCC 2 VCC 3 GND 2 Nominal Threshold Voltage Threshold Suffix Designation 3.08V T 2.93V S 4.38V M PIN DESCRIPTIONS Name Description RESET Active low reset. RESET is asserted if VCC falls below the reset threshold and remains low for at least 140ms after VCC rises above the reset threshold. GND Ground VCC Power supply voltage that is monitored. © 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice 1 Doc. No. 3026, Rev. B CAT853, CAT863, CAT859, CAT869 ABSOLUTE MAXIMUM RATINGS(1) Any pin with respect to ground -0.3V to +6.0V Input Current, VCC 20mA Output Current, RESET 20mA Rate of Rise, VCC 100V/μs Continuous Power Dissipation Derate 4mW/ºC above 70ºC (SOT23) 320 mW Operating Temperature Range -40ºC to +85ºC Storage Temperature Range -65ºC to +105ºC Lead Soldering Temperature (10 sec) 300ºC Note: (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. ELECTRICAL CHARACTERISTICS VCC = Full range, TA = -40ºC to +85ºC unless otherwise noted. Typical values at TA = +25ºC and VCC = 3.3V for the T/S versions, VCC = 5V for the M version. Parameter Symbol VCC Range Supply Current ICC Reset Threshold Voltage VTH Min Max Units TA = 0ºC to +70ºC 1.0 5.5 V TA = -40ºC to +85ºC 1.2 5.5 TA = -40ºC to +85ºC T Threshold S Threshold M Threshold VCC < 3.6V, S/T TA = +25ºC 3.04 TA = -40ºC to +85ºC 3.00 TA = +25ºC 2.89 TA = -40ºC to +85ºC 2.85 TA = +25ºC 4.31 TA = -40ºC to +85ºC 4.25 Reset Threshold Tempco VCC to Reset Delay VCC = VTH to (VTH - 100 mV) Reset Active Timeout Period TA = -40ºC to +85ºC RESET Output Voltage Low VOL RESET Output Voltage High VOH Typ(1) Conditions 140 6 15 μA 3.08 3.11 V 3.15 2.93 2.96 3.00 4.38 4.45 4.50 30 ppm/ºC 20 μs 240 460 VCC = VTH min, ISINK = 1.2mA 0.4 VCC > 1.0V, ISINK = 50μA 0.3 VCC = VTH max, ISOURCE = -500μA (for CAT859/869 only) 0.8 VCC ms V V Note: (1) Production testing done at TA = +25ºC; limits over temperature guaranteed by design only. Doc. No. 3026, Rev. B 2 © 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT853, CAT863, CAT859, CAT869 TYPICAL OPERATING CHARACTERISTICS VCC = Full range, TA = -40ºC to +85ºC unless otherwise noted. Typical values at TA = +25ºC, VCC=3.3V for T/S versions, and VCC = 5V for the M version. SUPPLY CURRENT VS. TEMPERATURE (NO LOAD) 260 12 240 SUPPLY CURRENT (μA) POWER-UP RESET TIMEOUT (mS) POWER-UP RESET TIMEOUT VS. TEMPERATURE VCC=5V 220 200 VCC=2.5V 180 160 10 VCC=5.5V 8 VCC=3.6V 6 4 2 0 -50 0 50 100 150 -50 0 POWER-DOWN RESET DELAY VS. TEMPERATURE 150 NORMALIZED RESET THRESHOLD VS. TEMPERATURE 14 12 10 8 6 4 2 0 -50 100 TEMPERATURE (°C) NORMALIZED THRESHOLD POWER-DOWN RESET DELAY (μS) TEMPERATURE (°C) 50 1.0002 1 0.9998 0.9996 0.9994 0.9992 0.999 0.9988 0 50 100 150 0 TEMPERATURE (°C) © 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice 20 40 60 80 100 120 TEMPERATURE (°C) 3 Doc No. 3026, Rev. B CAT853, CAT863, CAT859, CAT869 DETAILED DESCRIPTIONS 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 140ms after the power supply voltage has risen above the threshold. Threshold Voltage Power 5V Supply Voltage 0V RESET Reset Timeout Period 140ms minimum 5V 0V Figure 1. Reset Timing Diagram VCC TRANSIENT RESPONSE 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 0.5V above the threshold and drops below it by the amplitude of the overdrive voltage (VTH - VCC). The CAT853, CAT863, CAT859, and CAT869 protect μPs against brownout failure. Short duration transients of 4μsec or less and 100mV amplitude typically do not cause a false RESET. Figure 2 shows the maximum pulse duration of negativegoing VCC transients that do not cause a reset condition. Figure 2. Maximum Transient Duration Without Causing a Reset Pulse vs. Reset Comparator Overdrive Doc. No. 3026, Rev. B 4 © 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT853, CAT863, CAT859, CAT869 VALID RESET WITH VCC UNDER 1.0V To ensure that the CAT859 and CAT869 RESET pin is in a known state when VCC is under 1.0V, a >10kΩ pull-down resistor between RESET pin and GND is recommended. Power Supply VCC CAT8x9 RESET GND Figure 3. RESET Valid with VCC Under 1.0V BI-DIRECTIONAL RESET PIN INTERFACING The CAT859 and CAT869 can interface with μP/μC bi-directional reset pins by connecting a 4.7kΩ resistor in series with the CAT859 and CAT869 reset output and the μP/μC bi-directional reset pin. BUF Power Supply Buffered RESET VCC VCC CAT8x9 µP RESET INPUT RESET GND Bi-directional I/O Pin (For example: 68HC11) GND Figure 4. Bi-directional Reset Pin Interfacing © 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice 5 Doc No. 3026, Rev. B 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 5kΩ and 10kΩ. Power Supply VCC 5kΩ VCC CAT8x3 µP RESET RESET INPUT GND GND Figure 5. Typical CAT8x3 Open-Drain Circuit Configuration Doc. No. 3026, Rev. B 6 © 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT853, CAT863, CAT859, CAT869 PACKAGE INFORMATION Plastic SOT-23 (3-Pin) B E H e e1 D E c A ө A1 L1 Inches Min L Millimeters Max Min Max Plastic SOT-23 (3-Pin) A 0.0350 0.0441 0.89 1.12 A1 0.0005 0.0039 0.013 0.10 B 0.0146 0.0197 0.37 0.50 c 0.0033 0.0071 0.085 0.18 D 0.1102 0.1197 2.80 3.04 E 0.0472 0.0551 1.20 1.40 e 0.0350 0.0406 0.89 1.03 e1 0.0701 0.0807 1.78 2.05 H 0.0827 0.1039 2.10 2.64 ө 0º 8º 0º 8º L 0.0083 0.0161 0.275 0.41 L1 0.0160 0.0270 0.275 0.685 For current Tape and Reel information, download the PDF file from: www.catsemi.com/documents/tapeandreel.pdf Notes: (1) This part is compliant with JEDEC specification TO-236 (2) Die is face up for mold and trim/form (3) Dimensions are exclusive of mold flash and metal burr © 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice 7 Doc No. 3026, Rev. B CAT853, CAT863, CAT859, CAT869 EXAMPLE OF ORDERING INFORMATION (1) (2) (3) Prefix Device # CAT 859 Suffix S Company ID Device Type 853: Open Drain / Active Low Output 863: Open Drain / Active Low Output 859: Push-Pull / Active Low Output 869: Push-Pull / Active Low Output TBI Threshold Level T: 3.08V S: 2.93V M: 4.38V – T10 G Lead Finish G: NiPdAu (PPF) Package Type TBI: SOT-23 Green(1) T: Tape & Reel 3: 3000/Reel 10: 10000/Reel TOP MARKING Part and Threshold SOT-23 RoHS NiPdAu Finish(4) (5) Part and Threshold CAT859T CAT859S CAT853T RSYM CAT853S CAT859M CAT853M CAT869T CAT863T CAT869S SOT-23 RoHS NiPdAu Finish(4) (5) RTYM CAT863S CAT869M RUYM RVYM CAT863M ORDERING PART NUMBER CAT859TTBI-G CAT859STBI-G CAT859MTBI-G(6) CAT869TTBI-G CAT869STBI-G CAT869MTBI-G(6) CAT853TTBI-G CAT853STBI-G(6) CAT853MTBI-G CAT863TTBI-G CAT863STBI-G(6) 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 2.85V to 3.00V NiPdAu, Tape and Reel). (3) For additional package and temperature options, please contact your nearest Catalyst 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 categories, contact factory. Doc. No. 3026, Rev. B 8 © 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice REVISION HISTORY Date 10/11/2006 05/04/2007 Rev. Reason A Initial Issue CAT859, CAT869 B Added CAT853, CAT863 Update Example of Ordering Information Update Top Marking Update Ordering Part Number Copyrights, Trademarks and Patents Trademarks and registered trademarks of Catalyst Semiconductor include each of the following: Beyond Memory™, DPP ™, EZDim™, LDD™, MiniPot™ and Quad Mode™ Catalyst Semiconductor has been issued U.S. and foreign patents and has patent applications pending that protect its products. CATALYST SEMICONDUCTOR MAKES NO WARRANTY, REPRESENTATION OR GUARANTEE, EXPRESS OR IMPLIED, REGARDING THE SUITABILITY OF ITS PRODUCTS FOR ANY PARTICULAR PURPOSE, NOR THAT THE USE OF ITS PRODUCTS WILL NOT INFRINGE ITS INTELLECTUAL PROPERTY RIGHTS OR THE RIGHTS OF THIRD PARTIES WITH RESPECT TO ANY PARTICULAR USE OR APPLICATION AND SPECIFICALLY DISCLAIMS ANY AND ALL LIABILITY ARISING OUT OF ANY SUCH USE OR APPLICATION, INCLUDING BUT NOT LIMITED TO, CONSEQUENTIAL OR INCIDENTAL DAMAGES. Catalyst Semiconductor products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Catalyst Semiconductor product could create a situation where personal injury or death may occur. Catalyst Semiconductor reserves the right to make changes to or discontinue any product or service described herein without notice. Products with data sheets labeled “Advance Information” or “Preliminary” and other products described herein may not be in production or offered for sale. Catalyst Semiconductor advises customers to obtain the current version of the relevant product information before placing orders. Circuit diagrams illustrate typical semiconductor applications and may not be complete. Catalyst Semiconductor, Inc. Corporate Headquarters 2975 Stender Way Santa Clara, CA 95054 Phone: 408.542.1000 Fax: 408.542.1200 www.catsemi.com Document No: 3026 Revision: B Issue date: 05/04/07