APX811/812 4-Pin Microprocessor Supervisor With Manual Reset General Description Features • • • • • • • • • The APX811/812 are used for microprocessor supervisory circuit to monitor the power supplies in These circuit perform a single function: they assert a reset signal whenever the Vcc supply voltage declines below a preset threshold, keeping it asserted for at least 240ms after Vcc has risen above the reset threshold. Reset thresholds suitable for operation with a variety of supply voltages are available. The APX811/812 have push-pull outputs. The APX811 has an active low RESET output, while the APX812 has an active high RESET output. Precision Monitor of(2.5V/3.0V/3.3V/5.0V) power supply voltage Full specified over temperature Manual reset input Available in four output configuration Push-pull RESET Active low(APX811) Push-pull RESET Active high(APX812) Power-on reset generator with fixed delay time 200ms SOT143: Available in “Green” Molding Compound (No Br, Sb) Lead Free Finish/RoHS Compliant (Note 1) The APX811/812 devices incorporate a manual reset input, MR . A low level at MR causes RESET to become active. The APX811/2 are targeted at 2.5V, 3V, 3.3V and 5V powered systems and are available with different threshold voltages to meet the exact needs of the system. They are available in the space saving SOT143 package and operate over the whole industrial temperature range, -40 to 85°C. Applications • • • • • • Computers Controllers Intelligent Instruments Critical uP and UC power Monitoring Portable/Battery powered Equipment Automotive Typical Application Circuit Vcc Vcc Vcc APX811/APX812 MR (Manual Reset) Push Botton APX811/812 Rev. 2 DS31960 GND RESET (RESET) 1 of 10 www.diodes.com MCU RESET Input GND OCTOBER 2009 © Diodes Incorporated APX811/812 4-Pin Microprocessor Supervisor With Manual Reset Ordering Information APX 8 XX - XX U G - 7 Enable Voltage 11 : Active-Low 12 : Active-High Device APX811-XXUG-7 APX812-XXUG-7 Notes: 46 44 40 31 29 26 23 : 4.63 : 4.38 : 4.00 : 3.08 : 2.93 : 2.63 : 2.25 Package Green Packing U : SOT143 G : Green 7 : Tape & Reel Package Code Packaging (Note 2) U U SOT143 SOT143 7” Tape and Reel Quantity Part Number Suffix 3000/Tape & Reel 3000/Tape & Reel -7 -7 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. 2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf. Pin Assignments ( Top View ) GND 1 4 Vcc RESET (RESET) 2 3 MR SOT143 Pin Descriptions Pin Name GND RESET (RESET) VCC MR Description Ground Reset output Pin L: for APX811 H: for APX812 Operating Voltage Input Manual reset (Active Low) APX811/812 Rev. 2 DS31960 2 of 10 www.diodes.com OCTOBER 2009 © Diodes Incorporated APX811/812 4-Pin Microprocessor Supervisor With Manual Reset Block Diagram Driver Vcc Delay Circuit RESET Vref MR Absolute Maximum Ratings Symbol Parameter ESD HBM Human Body Model ESD protection ESD MM VCC VRESET Machine Model ESD Protection Supply voltage RESET Rating Unit 3 kV 500 V -0.3~7 V -0.3 to (Vcc+0.3) V ICC Input Current, Vcc 20 mA IO Output current 20 mA PD Power dissipation 320 mW Recommended Operating Conditions Symbol VCC VIN TA Parameter Supply Voltage Input Voltage Operating Ambient Temperature APX811/812 Rev. 2 DS31960 3 of 10 www.diodes.com Min 1.1 0 -40 Max 5.5 (VCC+0.3) 85 Unit V V o C OCTOBER 2009 © Diodes Incorporated APX811/812 4-Pin Microprocessor Supervisor With Manual Reset Electrical Characteristics (TA = 25ºC) TA= -40 to 85 oC unless otherwise note. Typical values are at TA=+25 oC. Symbol Parameter Test Conditions VCC VCC Range ICC Supply Current Vth + 0.2V Reset threshold Vth ts TA =25 C. VCC = Vth to (Vth – 100mV) VCC = Vth -0.2, ISINK = 1.2mA RESET Output Voltage Low VCC = Vth -0.2, ISINK = 3.2mA (APX811) VCC > 1.0V, ISINK = 50uA VCC > Vth +0.2, RESET Output Voltage-High ISOURCE = 500uA (APX811) VCC > Vth +0.2, ISOURCE = 800uA VCC = Vth +0.2, ISINK = 1.2mA RESET Output Voltage-Low (APX812) VCC = Vth +0.2, ISINK = 3.2mA RESET Output Voltage-High 1.8V < VCC < Vth -0.2, (APX812) ISOURCE = 150uA Thermal Resistance SOT143 (Note 3) Junction-to-Ambient Thermal Resistance SOT143 (Note 3) Junction-to-Case VOH VOL VOH θJA θJC Typ. Unit V µA 2.22 2.25 2.28 V 2.59 2.63 2.67 V 2.89 2.93 2.98 V 3.03 3.08 3.13 V 3.94 4.00 4.06 V 4.31 4.38 4.45 V 4.56 4.63 4.70 V 20 µs 0.3 0.4 0.3 V 0.8VCC V VCC –1.5 0.3 0.4 V 0.8 VCC V 240 o C/W 71 o C/W 3. Test condition for SOT143: Device mounted on FR-4 substrate, 1"*1", 2oz, copper, single-sided, PC boards. Timing requirements Symbol tW 30 Max 5.5 40 Set-up Time VOL Notes: o Min 1.0 Parameter Pulse Width APX811/812 Rev. 2 DS31960 at MR (TA=25oC) Test Conditions VCC> Vth-+0.2V, VIL=0.3 × VCC, VIH=0.7 × VCC 4 of 10 www.diodes.com Min Typ. Max Unit 100 - - ns OCTOBER 2009 © Diodes Incorporated APX811/812 4-Pin Microprocessor Supervisor With Manual Reset Switching Characteristics Symbol td tPHL (TA=25oC) Parameter Delay Time Test Conditions APX811/812 MR to RESET Propagation (Delay) Time, delay (APX811/812) High-to-low-level Output VCC to RESET delay tPLH MR to RESET delay Propagation (Delay) Time, (APX811/812) Low-to-high-level Output VCC to RESET delay (APX811/812) VCC> Vth-+0.2V, See timing diagram VCC> Vth-+0.2V, VIL=0.3 × VCC, VIH=0.7 × VCC VIL= Vth--0.2V, VIH= Vth-+0.2V VCC> Vth-+0.2V, VIL=0.3 × VCC, VIH=0.7 × VCC VIL= Vth--0.2V, VIH= Vth-+0.2V Min Typ. Max Unit 140 200 280 ms - - 0.1 µs - - 25 µs - - 0.1 µs - - 25 µs Timing Diagram RESET vs. Vcc Timing Diagram Vth Vcc Vth td td td td /RESET Vth RESET RESET vs. /MR Timing Diagram Vth Vcc /MR td td /RESET APX811/812 Rev. 2 DS31960 5 of 10 www.diodes.com OCTOBER 2009 © Diodes Incorporated APX811/812 4-Pin Microprocessor Supervisor With Manual Reset Typical Performance Characteristics RESET Timeout Period vs. Temperature RESET Threshold Voltage vs. Temperature 3.2 RESET Thershold Voltage (V) RESET Timeout Period (ms) 250 240 230 220 210 200 190 180 170 160 3.15 3.1 3.05 3 2.95 2.9 2.85 2.8 150 -40℃ -25℃ 0℃ -40℃ -25℃ 25℃ 50℃ 85℃ 105℃ 125℃ Temperature 25℃ 50℃ 85℃ 105℃ 125℃ Temperature Vcc Supply Current vs. Temperature (Vcc=3.3V Vth=2.93V) Supply Curreny vs. Vcc 35 40 34 35 33 Supply Current (µA) Vcc Supply Current (µA) 0℃ 32 31 30 29 28 27 30 25 20 15 10 5 26 25 -40℃ -25℃ 0℃ 25℃ 50℃ 85℃ 105℃ 125℃ 1.5V 2.5V 3.3V 4.0V 5.0V 5.5V Vcc Temperature APX811/812 Rev. 2 DS31960 0 6 of 10 www.diodes.com OCTOBER 2009 © Diodes Incorporated APX811/812 4-Pin Microprocessor Supervisor With Manual Reset Application Information A microprocessor’s (µP’s) reset input starts the µP in a known state. The APX811/812 asserts reset 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 or the MR pin is brought low, keeping it asserted for at least 240ms after VCC has risen above the reset threshold. The APX811/812 have a push-pull output stage. The APX811/812 reset output is guaranteed to be logic low for the APX811 and high the APX812 for VCC > 1V. Once VCC exceeds the reset threshold, an internal timer keeps RESET output low (and RESET high for the APX812) for the reset timeout period. After this interval, the APX811’s RESET output goes high (APX812’s RESET output goes low). If a brownout condition occurs (VCC dips below the reset threshold), the APX811’s RESET output goes low (APX812’s RESET output goes high). Any time VCC goes below the reset threshold, the internal timer resets to zero, and RESET goes low (RESET goes high). The internal timer starts after VCC returns above the reset threshold, and RESET remains low (RESET remains high) for the reset timeout period. Ensuring a Valid Reset Output Down to VCC = 0 When VCC falls below 1V, the APX811 RESET 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 µP and other circuitry is inoperative with VCC below 1V. However, in applications where RESET must be valid down to 0V, adding a pull down resistor to RESET causes any stray leakage currents to flow to ground, holding RESET low. R1’s value is not critical; 100k is large enough not to load RESET and small enough to pull RESET to ground. For the APX812 if RESET is required to remain valid for VCC < 1V then a 100kΩ pull-up resistor between RESET and VCC is recommended. Benefits of Highly Accurate Reset Threshold Most µP supervisor ICs has reset threshold voltages between 5% and 10% below the value of nominal supply voltages. This ensures a reset will not occur within 5% of the nominal supply, but will occur when the supply is 10% below nominal. When using ICs rated at only the nominal supply ±5%, this leaves a zone of uncertainty where the supply is between 5% and 10% low, and where the reset may or may not be asserted. APX811/812 Rev. 2 DS31960 7 of 10 www.diodes.com OCTOBER 2009 © Diodes Incorporated APX811/812 4-Pin Microprocessor Supervisor With Manual Reset Marking Information (1) SOT143 ( Top View ) 4 3 XX Y W X 1 2 Device APX811-46U APX811-44U APX811-40U APX811-31U APX811-29U APX811-26U APX811-23U APX812-46U APX812-44U APX812-40U APX812-31U APX812-29U APX812-26U APX812-23U APX811/812 Rev. 2 DS31960 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 : A~Z : Green Package SOT143 SOT143 SOT143 SOT143 SOT143 SOT143 SOT143 SOT143 SOT143 SOT143 SOT143 SOT143 SOT143 SOT143 8 of 10 www.diodes.com Identification Code C2 C3 C4 C5 C6 C7 C8 C9 CA CB CC CD CE CF OCTOBER 2009 © Diodes Incorporated APX811/812 4-Pin Microprocessor Supervisor With Manual Reset Package Information (All Dimensions in mm) (1) Package Type: SOT143 2.80/3.0 APX811/812 Rev. 2 DS31960 . 0.085/0.18 9 of 10 www.diodes.com 0.46/0.6 yp 0.37/0.51 8° t 0.77/0.93 0.013/0.10 0.89/1.0 1.58/1.83 2.28/2.48 0.45/0.6 1.20/1.40 1.78/2.03 OCTOBER 2009 © Diodes Incorporated APX811/812 4-Pin Microprocessor Supervisor With Manual Reset 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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