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APX809/810
3-PIN MICROPROCESSOR RESET CIRCUITS
Features
* * * * * * * * * * * 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 Active Low (APX809) Push-Pull RESET Active High (APX810) 200ms Typ Power-On Reset Pulse Width 30A Supply Current (Typ.) Guaranteed Reset Valid to VCC = +1V No External Components SOT23 and SOT23R: Available in "Green" Molding Compound (No Br, Sb) Lead Free Finish/RoHS Compliant (Note 1)
General Description
The APX809/810 are 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 +5V, +3.3V, +3.0V powered circuits. 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 APX809/810 have push pull outputs. The APX809 have an active low RESET output, while the APX810 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 APX809/810 ideal for use in portable equipment. The APX809/810 is available in a 3-pin SOT23 and SOT23R package.
Applications
* * * * * * Computers Controllers Intelligent Instruments Critical P and C Power Monitoring Portable/Battery Powered Equipment Automotive
Ordering Information
APX 8 XX - XX XX X X
Enable
09 : Active-Low 10 : Active-High
Voltage
46 44 40 31 29 26 23 : 4.63 : 4.38 : 4.00 : 3.08 : 2.93 : 2.63 : 2.25
Package
SA : SOT23 SR : SOT23R
Lead Free
G : Green
Packing
-7 : Taping
Device
APX809-XXSA APX810-XXSA APX809-XXSR APX810-XXSR
Notes:
Package Code
SA SA SR SR
Packaging (Note 2)
SOT23 SOT23 SOT23R SOT23R
Quantity
7" Tape and Reel Part Number Suffix
-7 -7 -7 -7
3000/Tape & Reel 3000/Tape & Reel 3000/Tape & Reel 3000/Tape & Reel
1. RoHS revision 13.2.2003. Glass and high temperature solder exemptions applied, see EU Directive Annex Notes 5 and 7. 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.
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APX809/810
3-PIN MICROPROCESSOR RESET CIRCUITS
Pin Assignments
( Top View )
( Top View )
GND
1 APX809 APX810 3 VCC
RESET (RESET)
1 APX809 APX810 3 VCC
RESET (RESET)
2
GND
2
SOT23
SOT23R
Pin Descriptions
Name GND
RESET (RESET)
Description Ground Reset Output Pin L: for APX809 H: for APX810 Operating Voltage Input
VCC
Absolute Maximum Ratings
Symbol VCC VRESET ICC IO PD TOP TST Supply Voltage RESET, RESET (push-pull) Input Current, VCC Output Current, RESET, RESET Continuous Power Dissipation (TA = +70C), de-rate 4mW/C above +70C Operating Junction Temperature Range Storage Temperature Range Parameter Rating -0.3 to +6.0 -0.3 to (VCC + 0.3) 20 20 400 -40 to +105 -65 to +150 Unit V V mA mA mW C C
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3-PIN MICROPROCESSOR RESET CIRCUITS
Recommended Operating Conditions
Symbol ESD HBM ESD MM VCC VIN TA TR Parameter Human Body Model ESD Protection Machine Model ESD Protection Supply Voltage Input Voltage Operating Ambient Temperature Range Vcc Rising Time (Vcc = 0~VT) Min 5 500 1.1 0 -40 5.5 (VCC+0.3) 85 100 Max Unit KV V V V o C V/ uS
Electrical Characteristics
(TA = 25C)
TA= -40 to 85 oC unless otherwise note. Typical values are at TA=+25 oC. Symbol Parameter Test Conditions VCC VCC Range TA = 0oC to +70oC ICC Supply Current VTH + 0.2V APX809/810-23 APX809/810-26 APX809/810-29 o o APX809/810-31 TA = 0 C-85 C APX809/810-40 APX809/810-44 Reset APX809/810-46 VTH Threshold APX809/810-23 APX809/810-26 APX809/810-29 o o APX809/810-31 TA = -40 C-85 C APX809/810-40 APX809/810-44 APX809/810-46 Reset Threshold Tempco TS Set-up Time VCC = VTH to (VTH - 100mV) TDELAY Reset Active Timeout Period TA = 0oC to +85oC VCC = VTH -0.2, ISINK = 1.2mA RESET Output Voltage Low VOL VCC = VTH -0.2, ISINK = 3.2mA (APX809) VCC > 1.0V, ISINK = 50uA VCC > VTH +0.2, RESET Output Voltage-High ISOURCE = 500uA VOH VCC > VTH +0.2, (APX809) ISOURCE = 800uA RESET Output Voltage-Low VCC = VTH +0.2, ISINK = 1.2mA VOL (APX810) VCC = VTH +0.2, ISINK = 3.2mA RESET Output Voltage-High 1.8V < VCC < VTH -0.2, VOH (APX810) ISOURCE = 150uA Thermal Resistance JA SOT23/SOT23R (Note 3) Junction-to-Ambient Thermal Resistance JC SOT23/SOT23R (Note 3) Junction-to-Case
Notes:
Min 1.0 2.21 2.59 2.88 3.02 3.93 4.31 4.56 2.20 2.57 2.86 3.00 3.92 4.29 4.54
Typ 30 2.25 2.63 2.93 3.08 4.00 4.38 4.63 2.25 2.63 2.93 3.08 4.00 4.38 4.63 30 20 200
Max 5.5 40 2.30 2.69 3.00 3.15 4.08 4.47 4.72 2.30 2.69 3.00 3.15 4.08 4.47 4.72
Unit V A
V
V
140
280 0.3 0.4 0.3
ppm/ oC s ms V
0.8VCC V VCC -1.5 0.3 0.4 0.8 VCC 201 56
o
V V C/W C/W
o
3. Test condition for SOT23/ SOT23R: Devices mounted on FR-4 substrate PC board, 2oz copper, with minimum recommended pad layout.
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3-PIN MICROPROCESSOR RESET CIRCUITS
Typical Application Circuit
V CC
100nF
CIN
V CC
V CC
APX8XX
RESET (RESET)
Microprocessor
RESET INPUT
GND
GND
Functional Description
A microprocessor's (P's) reset input starts the P in a known state. The APX809/810 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 APX809/810 have a push-pull output stage. Ensuring a Valid Reset Output Down to VCC = 0 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. However, in applications where
RESET must be valid down to 0V, adding a RESET
causes any stray leakage
pull down resistor to
currents to flow to ground, holding
RESET
low. R1's value is
RESET
is guaranteed to be a logic low for VCC > 1V. Once VCC
not critical; 100k are large enough not to load small enough to pull
RESET
and
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 threshold), RESET goes low. Any time VCC goes below the reset threshold, the internal timer resets to zero, and
RESET to ground. For RESET is required to remain valid for VCC < 1V.
the APX810 if
RESET
RESET
goes low. The internal timer starts after
VCC returns above the reset threshold, and low for the reset timeout period.
RESET
remains
Benefits of Highly Accurate Reset Threshold Most P 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.
When VCC falls below 1V, the APX809 RESET output no longer sinks current--it becomes an open circuit. Therefore,
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APX809/810
3-PIN MICROPROCESSOR RESET CIRCUITS
Block Diagram
Driver Delay Circuit VREF RESET / RESET
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3-PIN MICROPROCESSOR RESET CIRCUITS
Performance Characteristics
RESET Timeout Period vs. Temperature
250
RESET Threshold Voltage vs. Temperature
3.2
RESET Timeout Period (mS)
240 230 220 210 200 190 180 170 160 150 -40 -25 0 25 50 85 105 125
RESET Thershold Voltage (V)
3.15 3.1 3.05 3 2.95 2.9 2.85 2.8 -40 -25 0 25 50 85 105 125
Temperature
Temperature
Figure 1
Vcc Supply Current vs. Temperature (Vcc=3.3V Vth=2.93V)
35 34
Figure 2
Supply Current vs. Vcc
40
Vcc Supply Current (uA)
33 32 31 30 29 28 27 26 25 -40 -25 0 25 50 85 105 125
Supply Current (uA)
35 30 25 20 15 10 5 0 1.5V 2.5V 3.3V 4.0V 5.0V 5.5V
Temperature
Vcc
Figure 3
Figure 4
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3-PIN MICROPROCESSOR RESET CIRCUITS
Timing Diagram
Vth
Vcc
Vth
TDelay /RESET
Vth
TDelay
TDelay RESET
TDelay
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3-PIN MICROPROCESSOR RESET CIRCUITS
Marking Information
(1) SOT23/SOT23R
( Top View )
3 XX Y M X 1
Device APX809-46SA APX809-44SA APX809-40SA APX809-31SA APX809-29SA APX809-26SA APX809-23SA APX810-46SA APX810-44SA APX810-40SA APX810-31SA APX810-29SA APX810-26SA APX810-23SA APX809-46SR APX809-44SR APX809-40SR APX809-31SR APX809-29SR APX809-26SR APX809-23SR APX810-46SR APX810-44SR APX810-40SR APX810-31SR APX810-29SR APX810-26SR APX810-23SR
XX Y M G
: Identification code : Year 0-9 : Month A~L : Green
2
Package SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23R SOT23R SOT23R SOT23R SOT23R SOT23R SOT23R SOT23R SOT23R SOT23R SOT23R SOT23R SOT23R SOT23R Identification Code X2 X3 X4 X5 X6 X7 X8 XA XB XC XD XE XF XG Y2 Y3 Y4 Y5 Y6 Y7 Y8 YA YB YC YD YE YF YG
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3-PIN MICROPROCESSOR RESET CIRCUITS
Package Information
(All Dimensions in mm)
(1) Package Type: SOT23/SOT23R
Notes:
4. Package outline dimensions as shown on Diodes Inc. package outline dimensions document AP02002, which can be found on our website at http://www.diodes.com/datasheets/ap02002.pdf
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.
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