APX803S 3-PIN MICROPROCESSOR RESET CIRCUIT Description Pin Assignments NEW PRODUCT The APX803S is used for microprocessor (P) supervisory circuits to monitor the power supplies in P and digital systems. They provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with 5.0V, 3.3V, 3.0V and 2.5V powered circuits. (Top View) GND 1 APX803S These circuits perform a single function: they assert a reset signal on power up and whenever the VCC supply voltage declines below a RESET preset threshold, keeping it asserted for a fixed period of time after VCC has risen above the reset threshold. For the APX803S this period is a minimum of 1ms while for other APX803S variants it is at least 140ms. The reset comparator is designed to ignore fast transients on VCC, and the outputs are guaranteed to be in the correct logic state for VCC down to 1V. (Top View) RESET SOT23 (SR Package) * * * * Precision Monitoring of 2.5V, 3.0V, 3.3V, and 5.0V Power-Supply Voltages Fully Specified Over Temperature Open-drain RESET Active Low Power-On/Power Supply Glitch Reset Pulse APX803S00 1.7ms (Typ.) APX803S05 50ms (Typ.) APX803S 240ms (Typ.) 10A Supply Current (Typ.) Guaranteed Reset Valid to VCC = 1V Totally Lead-Free & Fully RoHS Compliant (Note 1 & 2) Halogen and Antimony Free. "Green" Device (Note 3) Notes: 3 VCC GND 2 Features * * 1 APX803S APX809S/810S which have push-pull output stages. Low supply current makes the APX803S ideal for use in portable equipment. The APX803S is available in two pin out variants of the 3-pin SOT23 package. * 2 SOT23 (SA Package) The APX803S is available with different reset thresholds suitable for operation with a variety of supply voltages. The APX803S has an open drain active low RESET output and compliment Diodes * 3 VCC Applications * * * * * Computers Controllers Intelligent Instruments Critical P and C Power Monitoring Portable/Battery Powered Equipment 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated's definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green" products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. APX803S Document number: DS39161 Rev. 2 - 2 1 of 9 www.diodes.com January 2017 (c) Diodes Incorporated APX803S Typical Applications Circuit V CC C IN 100nF V V CC NEW PRODUCT A PX803S CC M ic ro p ro c e s s o r RESET IN P U T RESET GND GND Pin Descriptions Pin Number Pin Name Description SOT23 (SA Package) SOT23 (SR Package) 1 2 GND 2 1 RESET Reset Output Pin Active Low Open Drain 3 3 VCC Operating Voltage Input Ground Functional Block Diagram S Absolute Maximum Ratings (@TA = +25C, unless otherwise specified.) Symbol ESD HBM Parameter Human Body Model ESD Protection Rating Unit 3 kV V ESD MM Machine Model ESD Protection 400 ESD CDM Charged Device Model ESD Protection 1500 V -0.3 to +6.0 V VCC VRESET Supply Voltage RESET (Open Drain) ICC Input Current, VCC -0.3 to 6 V 20 mA IO Output Current, RESET 20 mA JA Thermal Resistance Junction-to-Ambient (SOT23 Package) 232 C/W JC Thermal Resistance Junction-to-Case (SOT23 Package) 87 C/W TJ Junction Temperature TST Storage Temperature Range dVCC/dt VCC Rate of Rise (VCC = 0 to VT) APX803S Document number: DS39161 Rev. 2 - 2 2 of 9 www.diodes.com +150 C -65 to +150 C 100 V/s January 2017 (c) Diodes Incorporated APX803S Recommended Operating Conditions (@TA = +25C, unless otherwise specified.) Symbol VCC VRESET TA Supply Voltage Parameter Min 1.0 Max 5.5 Unit V RESET Output Voltage Operating Ambient Temperature Range 0 5.5 V -40 +85 C NEW PRODUCT Electrical Characteristics (Typical values are @ TA = +25C, unless otherwise specified.) Symbol ICC VTH -- tS Parameter Supply Current Reset Threshold Test Conditions IOH Max Unit A -- 10 15 2.21 2.25 2.30 APX803SXX-26 2.59 2.63 2.67 APX803SXX-29 2.89 2.93 2.97 3.04 3.08 3.13 APX803SXX-40 3.94 4.00 4.06 APX803SXX-44 4.31 4.38 4.45 APX803SXX-46 4.56 4.63 4.70 VTH + 0.2V APX803SXX-31 TA = +25C V Reset Threshold Tempco TA = -40C to +85C -- 30 -- ppm/C VCC to RESET Delay VCC = VTH to (VTH - 100mV) -- 20 -- s Reset Active Timeout Period APX803S05-XX 140 240 280 VCC 1.02 x VTH 20 50 70 1 1.7 3.3 VCC = VTH -0.2V, ISINK = 1.2mA -- -- 0.3 VCC = VTH -0.2V, ISINK = 3.5mA -- -- 0.4 VCC > 1.0V, ISINK = 50A -- -- 0.3 VCC > VTH +0.2V -- -- 1 APX803S00-XX VOL Typ. APX803SXX-23 APX803S-XX tDELAY Min RESET Output Voltage Low RESET Output High Leakage Current APX803S Document number: DS39161 Rev. 2 - 2 3 of 9 www.diodes.com ms V A January 2017 (c) Diodes Incorporated APX803S Performance Characteristics Reset Threshold Voltage vs. Temperature VCC_Rise VCC_Fall 2.96 2.94 2.92 2.90 -20 0 20 40 60 2.6 Reset Active Timeout Period (ms) Reset Threshold Voltage (V) APX803S 2.98 2.88 -40 Reset Active Timeout Period vs. Temperature APX803S-29 2.4 2.2 2.0 1.8 1.6 1.4 -40 80 -20 0 Temperature ( C) Suuply Current (A) 10 VCC = 3.3 V 4 2 -20 0 20 40 60 8 6 4 2 0 1 80 O 2 Output Sink Current vs. Supply Voltage APX803S-29 VDS=0.5V Output Sink Current (mA) 30 TA = 25 OC TA = 85 OC 20 10 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 70 Document number: DS39161 Rev. 2 - 2 5 6 APX803S-29 60 50 40 30 VCC = 1.5 V VCC = 2.0 V VCC = 2.5 V VCC = 2.8 V 20 10 0 0.0 Supply Voltage (V) APX803S 4 Output Sink Current vs. VDS 80 TA = - 40 OC 40 3 Supply Voltage (V) Temperature ( C) 50 80 TA = 25 OC 10 6 60 60 12 8 0 -40 40 Supply Current vs. Supply Voltage Supply Current vs. Temperature Supply Current (A) 12 20 Temperature (OC) O Output Sink Current (mA) NEW PRODUCT 3.00 4 of 9 www.diodes.com 0.5 1.0 1.5 2.0 2.5 3.0 3.5 VDS (V) January 2017 (c) Diodes Incorporated APX803S Timing Diagram V Vth TH Vcc NEW PRODUCT V TH Vth TtDELAY Delay TtDELAY Delay T Delay tDELAY T Delay tDELAY /RESET V TH Vth RESET Functional Description Microprocessors (Ps) and microcontrollers (C) have a reset input to ensure that it starts up in a known state. The APX803S drive the P's reset input to prevent code-execution errors during power-up, power-down, or brownout conditions. They assert a reset signal whenever the VCC supply voltage declines below a preset threshold and keep it asserted for a fixed period of time after VCC has risen above the reset threshold. For the APX803S00 this period is a minimum of 1ms while for other APX803S variants it is at least 140ms. The APX803S has an open-drain output stage. Ensuring a Valid Reset Output Down to VCC = 0 RESET is guaranteed to be a logic low for VCC > 1V. Once VCC exceeds the reset threshold, an internal timer keeps RESET low for the reset timeout period; after this interval, RESET goes high. If a brownout condition occurs (VCC dips below the RESET reset threshold), RESET goes low. Any time VCC goes below the reset threshold, the internal timer resets to zero, and RESET goes low. The internal timer starts after VCC returns above the reset threshold, and RESET remains low for the reset timeout period. When VCC falls below 1V, the APX803S RESET output no longer sinks current -- it becomes an open circuit. Therefore, high-impedance CMOS logic inputs connected to RESET can drift to undetermined voltages. This presents no problem in most applications since most P and other circuitry is inoperative with VCC below 1V. Interfacing to P with Bidirectional RESET Pins Since the RESET output on the APX803S is open drain, this device interfaces easily with P/C that has bidirectional RESET pins, such as the Motorola 68HC11. Connecting the P supervisor's RESET output directly to the microcontroller's (C's) RESET pin with a single pull-up resistor allows either device to assert reset. Supervising and Monitoring Multiple Supplies Generally, the pull-up resistor connected to the APX803S will connect to the supply voltage that is being monitored at the IC's VCC pin. However, some systems may use the APX803S open-drain output to level-shift from the monitored supply to reset the P powered by a different supply voltage or monitor multiple supplies that will be fed into 1 C/P reset input. APX803S Document number: DS39161 Rev. 2 - 2 5 of 9 www.diodes.com January 2017 (c) Diodes Incorporated APX803S Functional Description (Cont.) Selection of Voltage Divider Value (Take APX803S00-29SA-7 as example) VIN R1 NEW PRODUCT R2 VCC VCC R3 Microprocessor APX803S RESET INPUT RESET GND GND When VCC just rises up to the VTH value (2.93V in this case), the internal oscillator will start working, which may pull some considerable current from the source voltage, such as 60A or so. Take above topology as real application example, below equation required to meet to make sure the IC boot up smoothly. Given VCC = 13.2V and R3 = 100k, an appropriate R1/R2 value combination would be R1 = 15.6k and R2 = 7.3k. Note: RIN is defined as equivalent input resistance of APX803S00-29, 51.4k derived by 2.93V/57A in this case. Ordering Information APX803S X - X X - X Output Type 03: Active Low, Open Drain Part Number Voltage Blank : 240ms 00 : 1.7ms 05 : 50ms 23 : 2.25V Package Packing SA/SR : SOT23 7 : Tape & Reel 46 : 4.63V Package Code Packaging (Note 4) Quantity SA SR SOT23 SOT23 3000/Tape & Reel 3000/Tape & Reel APX803SXX-XXSA-7 APX803SXX-XXSR-7 Note: Reset Active Timeout Period 7" Tape and Reel Part Number Suffix -7 -7 4. Pad layout as shown in Diodes Incorporated's package outline PDFs, which can be found on our website at http://www.diodes.com/package-outlines.html. APX803S Document number: DS39161 Rev. 2 - 2 6 of 9 www.diodes.com January 2017 (c) Diodes Incorporated APX803S Marking Information (1) SOT23 ( Top View ) 3 XX Y W X NEW PRODUCT 1 2 XX : Identification code Y : Year 0~9 W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week X : Internal code Device Package Identification Code APX803S-46SA APX803S-44SA APX803S-40SA APX803S-31SA APX803S-29SA APX803S-26SA APX803S-23SA APX803S-46SR APX803S-44SR APX803S-40SR APX803S-31SR APX803S-29SR APX803S-26SR APX803S-23SR APX803S00-46SA APX803S00-44SA APX803S00-40SA APX803S00-31SA APX803S00-29SA APX803S00-26SA APX803S00-23SA APX803S00-46SR APX803S00-44SR APX803S00-40SR APX803S00-31SR APX803S00-29SR APX803S00-26SR APX803S00-23SR APX803S05-46SA APX803S05-44SA APX803S05-40SA APX803S05-31SA APX803S05-29SA APX803S05-26SA APX803S05-23SA APX803S05-46SR APX803S05-44SR APX803S05-40SR APX803S05-31SR APX803S05-29SR APX803S05-26SR APX803S05-23SR SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 V3 V4 V5 V6 V7 V8 V9 S3 S4 S5 S6 S7 S8 S9 VA VB VC VD VE VF VG VH VJ VK VM VS VT VU VV VW VX VY VZ WA WB WC WD WE WF WG WH WZ APX803S Document number: DS39161 Rev. 2 - 2 7 of 9 www.diodes.com January 2017 (c) Diodes Incorporated APX803S Package Outline Dimensions Please see http://www.diodes.com/package-outlines.html for the latest version. SOT23 All 7 H NEW PRODUCT K1 GAUGE PLANE 0.25 J K a M A L C L1 B D F SOT23 Dim Min Max Typ A 0.37 0.51 0.40 B 1.20 1.40 1.30 C 2.30 2.50 2.40 D 0.89 1.03 0.915 F 0.45 0.60 0.535 G 1.78 2.05 1.83 H 2.80 3.00 2.90 J 0.013 0.10 0.05 K 0.890 1.00 0.975 K1 0.903 1.10 1.025 L 0.45 0.61 0.55 L1 0.25 0.55 0.40 M 0.085 0.150 0.110 a 0 8 -All Dimensions in mm G Suggested Pad Layout Please see http://www.diodes.com/package-outlines.html for the latest version. SOT23 Y Dimensions C X X1 Y Y1 C Y1 X APX803S Document number: DS39161 Rev. 2 - 2 Value (in mm) 2.0 0.8 1.35 0.9 2.9 X1 8 of 9 www.diodes.com January 2017 (c) Diodes Incorporated APX803S IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 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