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APX803
3-PIN MICROPROCESSOR RESET CIRCUIT
Features
* * * * * * * * * * Precision Monitoring of +2.5V, +3V, +3.3V, and +5V Power-Supply Voltages Fully Specified Over Temperature Available in three Output Configurations Open-drain RESET Active Low 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 APX803 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 +5V, +3.3V, +3.0V powered circuits. These circuits perform a single function: they assert a reset signal on power up and whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for at least 140ms after VCC has risen above the reset threshold. Reset thresholds suitable for operation with a variety of supply voltages are available. The APX803 have an open collector active low
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 APX803 ideal for use in portable equipment. The APX803 is available in two pin out variants of the 3-pin SOT23 and SOT23R packages.
Applications
* * * * * Computers Controllers Intelligent Instruments Critical P and C Power Monitoring Portable/Battery Powered Equipment
Typical Application Circuit
Vcc
100nF
CIN
Vcc
Vcc
APX803
RESET
Microprocessor
RESET INPUT
GND
GND
APX803
Document number: DS32132 Rev. 1 - 2
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APX803
3-PIN MICROPROCESSOR RESET CIRCUIT
Ordering Information
APX 8 03 - XX XX G - 7 Output type
03 : Active-Low, Open Drain
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
Green
G : Green
Packing
7 : Tape & Reel
Device APX803-XXSAG-7 APX803-XXSRG-7
Notes:
Package Code SA SR
Packaging (Note 2) SOT23 SOT23R
7" Tape and Reel Quantity Part Number Suffix 3000/Tape & Reel -7 3000/Tape & Reel -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
(1) SOT23
( Top View )
(2) SOT23R
( Top View )
GND
1 APX803 3 VCC
RESET
1 APX803 3 VCC
RESET
2
GND
2
Pin Descriptions
Pin Name GND Ground Description
RESET VCC
Reset Output Pin Active Low Open Drain Operating Voltage Input
APX803 Rev. 1
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APX803
3-PIN MICROPROCESSOR RESET CIRCUIT
Absolute Maximum Ratings
Symbol Parameter Rating Unit
ESD HBM ESD MM VCC VRESET ICC IO PD TOP TST
Human Body Model ESD Protection Machine Model ESD Protection Supply Voltage RESET (open drain) Input Current, VCC Output Current, RESET Continuous Power Dissipation (TA = +70C), de-rate 4mW/C above +70C Operating Junction Temperature Range Storage Temperature Range
2 200 -0.3 to +6.0 -0.3 to 6 20 20 400 -40 to +105 -65 to +150
kV V V V mA mA mW C C
Recommended Operating Conditions
Symbol Parameter Min Max Unit
VCC VIN VRESET TA dVCC/dt
Supply Voltage Input Voltage RESET output voltage Operating Ambient Temperature Range VCC Rate of rise (VCC = 0~VT)
1.1 0 0 -40
5.5 (VCC+0.3) 5.5 85 100
V V V C V/s
APX803 Rev. 1
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APX803
3-PIN MICROPROCESSOR RESET CIRCUIT
Electrical Characteristics
(TA = 25C)
TA= -40 to 85C unless otherwise note. Typical values are at TA=+25 C. Symbol Parameter Test Conditions ICC Supply Current VTH + 0.2V APX803-23 APX803-26 APX803-29 Reset APX803-31 TA = 25oC VTH Threshold APX803-40 APX803-44 APX803-46 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 VOL VCC = VTH -0.2, ISINK = 3.5mA RESET Output Voltage Low VCC > 1.0V, ISINK = 50uA IOH JA JC
Notes:
Min
2.21 2.59 2.89 3.04 3.94 4.31 4.56
140
Typ. 30 2.25 2.63 2.93 3.08 4.00 4.38 4.63 30 20 200
Max 40 2.30 2.66 2.96 3.13 4.06 4.45 4.70
Unit A
V
280 0.3 0.4 0.3 1
ppm/ oC s ms V A C/W C/W
RESET Output High leakage V > V +0.2 CC TH current Thermal Resistance SOT23/ SOT23R (Note 3) Junction-to-Ambient Thermal Resistance SOT23/ SOT23R (Note 3) Junction-to-Case
201 56
3. Test condition for SOT23 and SOT23R: Devices mounted on FR-4 substrate PC board, 2oz copper, with minimum recommended pad layout. 4. Final datasheet limits to be determined by characterization and correlation.
APX803 Rev. 1
Document number: DS32132 Rev. 1 - 2
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APX803
3-PIN MICROPROCESSOR RESET CIRCUIT
Functional Description
Microprocessors (Ps) and microcontrollers (C) have a reset input to ensure that it starts up in a known state. The APX803 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, keeping it asserted for at least 140ms after VCC has risen above the reset threshold. The APX803 has an open-drain output stage. Ensuring a Valid Reset Output Down to VCC = 0 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 APX803 is open drain, this device interfaces easily with P/C that have 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 APX803 will connect to the supply voltage that is being monitored at the IC's VCC pin. However, some systems may use the APX803 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.
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
RESET remains
VCC returns above the reset threshold, and low for the reset timeout period.
When VCC falls below 1V, the APX803 RESET output no longer sinks current -- it becomes an open circuit. Therefore, high-impedance CMOS logic inputs connected to RESET can
Block Diagram
Driver Delay Circuit VREF
RESET / RESET
APX803 Rev. 1
Document number: DS32132 Rev. 1 - 2
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3-PIN MICROPROCESSOR RESET CIRCUIT
Performance Characteristics
RESET Threshold Voltage vs. Temperature
5.0
RESET Timeout Period vs. Temperature
250
RESET Threshold Voltage(V)
APX803-44
4.5 4.0 3.5 3.0 2.5 2.0 -50 -25 0 25 50 75 100
RESET Timeout Period(ms)
240 230 220 210 200 190 180 170 160 150 -50 -25 0 25 50 75 100
APX803-26
Temperature (C)
Temperature (C)
Figure 1
Supply Current vs. Temperature
30 29
Figure 2
Supply Current vs. Vcc
40
Vcc=3.3V
35
Vcc Supply Current(uA)
28 27 26 25 24 23 22 21 20 -50 -25 0 25 50 75 100
Supply Current(uA)
30 25 20 15 10 5 0 0 1 2 3 4 5 6
Temperature (C)
Vcc(V)
Figure 3
Figure 4
APX803 Rev. 1
Document number: DS32132 Rev. 1 - 2
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APX803
3-PIN MICROPROCESSOR RESET CIRCUIT
Performance Characteristics
(Continued)
Nch Driver Sink Current vs. Vcc
60 APX803-26 VDS=0.5V
Nch Driver Sink Current vs. Vcc
60 APX803-44 VDS=0.5V
-40C 25C
Sink Current Isink(mA)
40
-40C
Sink Current Isink(mA)
50
50 40 30 20 10 0
85C
30
25C
20
85C
10 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0
0.0
1.0
2.0
3.0
4.0
5.0
Vcc(V)
Vcc(V)
Figure 5
Nch Driver Output Current vs. VDS
80
100
Figure 6
Nch Driver Output Current vs. VDS
Nch Driver Output Current(mA)
90 80 70 60 50 40 30 20 10 0 0.0 0.5 1.0 1.5 Vcc= 2.0V Vcc= 1.5V 2.0 2.5 3.0 3.5 4.0 Vcc= 3.5V Vcc= 3.0V Vcc= 2.5V
Nch Driver Output Current(mA)
70 60 50 40
APX803-26
APX803-44
Vcc= 4.0V
Vcc= 2.5V 30 20 10 0 0.0 0.5 1.0 Vcc= 1.5V 1.5 2.0 2.5 3.0 Vcc= 2.0V
VDS(V)
VDS(V)
Figure 7
Figure 8
APX803 Rev. 1
Document number: DS32132 Rev. 1 - 2
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APX803
3-PIN MICROPROCESSOR RESET CIRCUIT
Timing Diagram
Vth
Vcc
Vth
TDelay /RESET
Vth
TDelay
TDelay RESET
TDelay
Marking Information
(1) SOT23 and SOT23R
( Top View )
3 XX Y W X 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 : A~Z : Green
Device APX803-46SA APX803-44SA APX803-40SA APX803-31SA APX803-29SA APX803-26SA APX803-23SA APX803-46SR APX803-44SR APX803-40SR APX803-31SR APX803-29SR APX803-26SR APX803-23SR
Package SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23R SOT23R SOT23R SOT23R SOT23R SOT23R SOT23R
Identification Code V3 V4 V5 V6 V7 V8 V9 S3 S4 S5 S6 S7 S8 S9
APX803 Rev. 1
Document number: DS32132 Rev. 1 - 2
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APX803
3-PIN MICROPROCESSOR RESET CIRCUIT
Package Information
(All Dimensions in mm)
(1) Package Type: SOT23 and SOT23R
Notes:
5. 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
APX803
Document number: DS32132 Rev. 1 - 2
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APX803
3-PIN MICROPROCESSOR RESET CIRCUIT
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APX803
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