AP1701/2/3/4 3-PIN MICROPROCESSOR RESET CIRCUITS General Description Features • • • The AP1701/2/3/4 are used for microprocessor (µP) supervisory circuits to monitor the power supplies in µP and digital systems. They provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with +5V, +3.3V, +3.0V powered circuits. Precision Monitoring of +2.5V, +3V, +3.3V, and +5V Power-Supply Voltages Fully Specified Over Temperature Available in three Output Configurations • Push-Pull RESET Low Output (AP1701/3) • • • • • • • • Push-Pull RESET High Output (AP1702/4) 200ms Min. Power-On Reset Pulse Width 20µA Supply Current (Typ.) Guaranteed Reset Valid to VCC = +1V Power Supply Transient Immunity No External Components Green Package: SC59-3L Lead Free Finish / RoHS Compliant (Note1) These circuits 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 AP1701/2/3/4 have push pull outputs. The AP1701/3 have an active low RESET output, while the AP1702/4 has an active high RESET output. 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. Low supply current makes the AP1701/2/3/4 ideal for use in portable equipment. The AP1701/2/3/4 is available in a 3-pin SC59 package. Applications • • • • • • Computers Controllers Intelligent Instruments Critical µP and µC Power Monitoring Portable/Battery Powered Equipment Automotive Ordering Information AP170X X X X X 1 2 3 4 Enable Voltage : Active-Low : Active-High : Active-Low : Active-High A B C D E F G Package : 4.63 : 4.38 : 4.00 : 3.08 : 2.93 : 2.63 : 2.25 W : SC59 Lead Free Packing L : Lead Free G : Green -7 : Taping Notes: 1. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7. Device AP170XXW Package Packaging Code (Note 2) W SC59 Quantity 7” Tape and Reel Part Number Suffix 3000/Tape & Reel -7 Notes: 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. AP1701/2/3/4 Rev. 2 1 of 9 www.diodes.com FEBRUARY 2007 © Diodes Incorporated AP1701/2/3/4 3-PIN MICROPROCESSOR RESET CIRCUITS Pin Assignments (Top View) GND (Top View) 1 RESET (RESET) AP1701 AP1702 RESET (RESET) 1 AP1703 AP1704 3 VCC GND 2 3 VCC 2 SC59-3L SC59-3L Pin Descriptions Name Description GND Ground Reset Output Pin L: for AP1701/3 H: for AP1702/4 Operating Voltage Input RESET (RESET) VCC Absolute Maximum Ratings Symbol VCC VRESET ICC IO Parameter Terminal Voltage (with respect to GND) RESET, RESET (push-pull) Input Current, VCC Rating Unit -0.3 to +6.0 V -0.3 to (VCC + 0.3) V 20 mA 20 mA 320 mW TOP Output Current, RESET, RESET Continuous Power Dissipation (TA = +70°C), de-rate 4mW/°C above +70°C Operating Junction Temperature Range -40 to +105 °C TST Storage Temperature Range -65 to +150 °C PD AP1701/2/3/4 Rev. 2 2 of 9 www.diodes.com FEBRUARY 2007 © Diodes Incorporated AP1701/2/3/4 3-PIN MICROPROCESSOR RESET CIRCUITS Electrical Characteristics (TA = 25ºC) Symbol Parameter VCC VCC Range ICC Supply Current VTH TS TDELAY VOL VOH VOL VOH Conditions TA = 0oC to +70oC VTH + 1.0V AP1701/2/3/4A AP1701/2/3/4B AP1701/2/3/4C Reset Threshold AP1701/2/3/4D TA = 25ºC AP1701/2/3/4E AP1701/2/3/4F AP1701/2/3/4G Reset Threshold Tempco Set-up Time VCC = 0 to (VTH – 100mV) Reset Active TA = 0oC to +70oC Timeout Period VCC = VTH min, ISINK = 1.2mA, AP1701/3 RESET Output V = V min, I CC TH SINK = 3.2mA Voltage Low VCC > 1.0V, ISINK = 50uA RESET Output VCC > VTH max, ISOURCE = 500uA, AP1701/3 VCC > VTH max, ISOURCE = 800uA Voltage-High RESET Output VCC = VTH max, ISINK = 1.2mA, AP1702/4 Voltage-Low VCC = VTH max, ISINK = 3.2mA RESET Output 1.8V < VCC < VTH min, ISOURCE = 150uA, Voltage-High AP1702/4 Min. 1.0 4.54 4.29 3.92 3.02 2.87 2.57 2.20 Typ. 20 4.63 4.38 4.00 3.08 2.93 2.63 2.25 Max. 5.5 30 4.72 4.47 4.08 3.14 2.99 2.68 2.30 100 240 600 ms 0.3 0.4 0.3 V 0.8VCC VCC –1.5 V 0.3 0.4 0.8 VCC V ppm/ o C µs 30 100 Unit V µA V V Typical Application Circuit V CC Cin 0.1uF V CC V CC AP170X RESET (RESET) GND AP1701/2/3/4 Rev. 2 Microprocessor RESET INPUT GND 3 of 9 www.diodes.com FEBRUARY 2007 © Diodes Incorporated AP1701/2/3/4 3-PIN MICROPROCESSOR RESET CIRCUITS Function Description A microprocessor’s (µP’s) reset input starts the µP in a known state. The AP1701/2/3/4 assert 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, keeping it asserted for at least 240ms after VCC has risen above the reset threshold. The AP1701/2/3/4 have a push-pull output stage. Applications Information Negative-Going VCC Transients In addition to issuing a reset to the µP during power-up, power-down, and brownout conditions, the AP1701/2/3/4 are relatively immune to short-duration negative-going VCC transients (glitches). The AP1701/2/3/4 do not generate a reset pulse. The graph was generated using a negative going pulse applied to VCC, starting 0.5V above the actual reset threshold and ending below it by the magnitude indicated (reset comparator overdrive). The graph indicates the maximum pulse width a negative going VCC transient can have without causing a reset pulse. As the magnitude of the transient increases (goes farther below the reset threshold), the maximum allowable pulse width decreases. Typically, a VCC transient that goes 100mV below the reset threshold and lasts 100µs or less will not cause a reset pulse. A 0.1µF bypass capacitor mounted as close as possible to the VCC pin provides additional transient immunity. 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. below the 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 for the reset timeout period. RESET remains low When VCC falls below 1V, the AP1701/3 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 µP and other circuitry is inoperative with VCC below 1V. However, in applications where pull down resistor to RESET must be valid down to 0V, adding a RESET causes any stray leakage currents to flow to ground, holding RESET not critical; 100k are large enough not to load low. R1’s value is RESET and RESET to ground. For the AP1702/4 if RESET is required to remain valid for VCC < 1V. small enough to pull 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. If a brownout condition occurs (VCC dips RESET Block Diagram Driver Delay Circuit RESET / RESET VREF AP1701/2/3/4 Rev. 2 4 of 9 www.diodes.com FEBRUARY 2007 © Diodes Incorporated AP1701/2/3/4 3-PIN MICROPROCESSOR RESET CIRCUITS Performance Characteristics Threshold 24 2.928 20 2.926 16 Iq 12 2.924 8 2.922 4 0 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 2.92 0 10 20 30 40 50 60 70 80 90 Temp Temp ( C ) Iq vs. Temp AP1701/2/3/4 Rev. 2 -40 -30 -20 -10 Threshold vs. Temp 5 of 9 www.diodes.com FEBRUARY 2007 © Diodes Incorporated AP1701/2/3/4 3-PIN MICROPROCESSOR RESET CIRCUITS Timing Diagram VTH VCC TDELAY TDELAY Active Low TS Active High TDELAY TDELAY Giltch Immunity Maximum Transient Duration(us) 3500 3000 2500 3000 2000 1500 1000 500 900 270 0 0 100 200 140 300 90 400 70 500 58 600 50 700 50 800 48 48 900 1000 1100 RESET COMPARATOR OVERDRIVE(mV) AP1701/2/3/4 Rev. 2 6 of 9 www.diodes.com FEBRUARY 2007 © Diodes Incorporated AP1701/2/3/4 3-PIN MICROPROCESSOR RESET CIRCUITS Marking Information (1) SC59-3L (Top View) 3 XX : Identification code : Year 0-9 Y : Month A~L M L : Lead Free Package G : Green Package XX Y M X 1 Device AP1701AW AP1701BW AP1701CW AP1701DW AP1701EW AP1701FW AP1701GW AP1702AW AP1702BW AP1702CW AP1702DW AP1702EW AP1702FW AP1702GW AP1703AW AP1703BW AP1703CW AP1703DW AP1703EW AP1703FW AP1703GW AP1704AW AP1704BW AP1704CW AP1704DW AP1704EW AP1704FW AP1704GW Notes: 2 Package (Note 3) Identification Code SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 EA EB EC ED EE EF W1 E0 E2 E3 E4 E5 E6 W2 EG EH EI EJ EK EL W3 E7 E8 E9 EM EN EP W4 3. For Packaging Details, go to our website at http://www.diodes.com/datasheets/ap02007.pdf. AP1701/2/3/4 Rev. 2 7 of 9 www.diodes.com FEBRUARY 2007 © Diodes Incorporated AP1701/2/3/4 3-PIN MICROPROCESSOR RESET CIRCUITS Package Information (All Dimensions in mm) (1) Package Type: SC59-3L TOP VIEW 1.50/ 1.70 0.35/0.50 2.70/ 3.00 1.90 2.90/3.10 1.00/ 1.30 0.013/0.10 0.10/0.20 0.95 0.35/0.55 0°/8° AP1701/2/3/4 Rev. 2 8 of 9 www.diodes.com FEBRUARY 2007 © Diodes Incorporated AP1701/2/3/4 3-PIN MICROPROCESSOR RESET CIRCUITS IMPORTANT NOTICE Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on our website, harmless against all damages. LIFE SUPPORT Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the President of Diodes Incorporated. AP1701/2/3/4 Rev. 2 9 of 9 www.diodes.com FEBRUARY 2007 © Diodes Incorporated