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APX803/D
3-PIN MICROPROCESSOR RESET CIRCUIT
Description
The APX803/D 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 a fixed period of time after VCC has risen above the reset threshold. For the APX803D this period is a minimum of 1ms while for other APX803 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. The APX803 is available with different reset thresholds suitable for operation with a variety of supply voltages, however the APX803D is available with a 2.93V threshold voltage. The APX803/D have an open collector active low RESET output and compliment Diodes APX809/10 which have pushpull output stages.. Low supply current makes the APX803/D ideal for use in portable equipment. The APX803/D are available in two pin out variants of the 3-pin SOT23 package.
Pin Assignments
( Top View )
GND 1 APX803 RESET 2 3 VCC
SOT23
( Top View )
1 APX803 GND 2 3 VCC
RESET
SOT23R
Features
* * * * Precision Monitoring of +2.5V, +3V, +3.3V, and +5V Power-Supply Voltages Fully Specified Over Temperature Open-drain RESET Active Low Power-On/power supply glitch Reset Pulse * APX803D 2ms (Typ) * APX803 200ms (Typ) 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)
Applications
* * * * * Computers Controllers Intelligent Instruments Critical P and C Power Monitoring Portable/Battery Powered Equipment
* * * * *
Notes:
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.
APX803
Document number: DS32132 Rev. 2 - 2
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APX803/D
3-PIN MICROPROCESSOR RESET CIRCUIT Typical Application Circuit
V CC
100nF
CIN
V CC
V CC
APX803
RESET
Microprocessor
RESET INPUT
GND
GND
Pin Descriptions
Pin Name GND Ground
Description
RESET
VCC
Reset Output Pin Active Low Open Drain Operating Voltage Input
Functional Block Diagram
VCC
Oscillator
Delay time RESET
VREF
APX803/D
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APX803/D
3-PIN MICROPROCESSOR RESET CIRCUIT Absolute Maximum Ratings
Symbol ESD HBM ESD MM VCC VRESET ICC IO PD TOP TST Parameter Human Body Model ESD Protection Machine Model ESD Protection Supply Voltage Rating 2 200 -0.3 to +6.0 -0.3 to 6 20 20 400 -40 to +105 -65 to +150 Unit kV V V V mA mA mW C C
RESET (open drain)
Input Current, VCC Output Current, RESET Continuous Power Dissipation (TA = +70C), derate 4mW/C above +70C Operating Junction Temperature Range Storage Temperature Range
Recommended Operating Conditions
Symbol VCC VIN VRESET TA dVCC/dt Supply Voltage Input Voltage Parameter Min 1.1 0 0 -40 Max 5.5 (VCC+0.3) 5.5 85 100 Unit V V V C V/s
RESET output voltage
Operating Ambient Temperature Range VCC Rate of rise (VCC = 0~VT)
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APX803/D
3-PIN MICROPROCESSOR RESET CIRCUIT Electrical Characteristics (TA = 25C)
TA= -40 to 85C unless otherwise note. Typical values are at TA=+25 C. Symbol ICC Parameter Supply Current APX803-23 APX803-26 APX803-29 Reset Threshold VTH APX803D-29 APX803-31 APX803-40 APX803-44 APX803-46 Reset Threshold hysteresis Reset Threshold Tempco tS tDELAY VCC to RESET delay Reset Active Timeout Period APX803-XX APX803D-29 VCC = VTH to (VTH - 100mV)
o o TA = 0 C to +85 C o TA = 25 C
Test Conditions VTH + 0.2V
Min
Typ. 30
Max 40 2.30 2.66 2.96 2.96 3.13 4.06 4.45 4.70
Unit A
2.21 2.59 2.89 2.89 3.04 3.94 4.31 4.56 VTH-H - VTH-L
2.25 2.63 2.93 2.93 3.08 4.00 4.38 4.63 40 30 20
V
mV ppm/C s 280 3.3 0.3 0.4 0.3 1 A C/W C/W V ms
140 1
200
VCC = VTH -0.2, ISINK = 1.2mA VOL
RESET Output Voltage Low RESET Output High leakage
current Thermal Resistance Junction-toAmbient Thermal Resistance Junction-to-Case
VCC = VTH -0.2, ISINK = 3.5mA VCC > 1.0V, ISINK = 50uA
IOH JA JC
Notes:
VCC > VTH +0.2 SOT23/SOT23R (Note 2) SOT23/SOT23R (Note 2) 201 56
2. Test condition for SOT23 and SOT23R: Devices mounted on FR-4 substrate PC board, 2oz copper, with minimum recommended pad layout. 3. Final datasheet limits to be determined by characterization and correlation.
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APX803/D
3-PIN MICROPROCESSOR RESET CIRCUIT Typical Performance Characteristics
RESET Threshold Voltage vs. Temperature
5.0
5.0
RESET Threshold Voltage vs. Temperature
RESET Threshold Voltage(V
RESET Threshold Voltage(V
4.5 4.0 3.5 3.0 2.5 2.0 -50 -25 0 25 50 75 100
APX803-44
4.5 4.0 3.5 3.0 2.5 2.0 -50 -25 0 25 50 75 100
APX803-26
Temperature (C)
Temperature (C)
Figure 1
RESET Timeout Period vs. Temperature
250 240 230 220 210 200 190 180 170 160 150 -50 -25 0 25 50 75 100
Figure 2
RESET Timeout Period vs. Temperature
RESET Timeout Period(ms)
APX803
RESET Timeout Period(ms)
3.00 2.80 2.60 2.40 2.20 2.00 1.80 1.60 1.40 1.20 1.00 -50 -25 0 25 50 75 100
APX803D
Temperature (C)
Temperature (C)
Figure 3
Supply Current vs. Temperature
30 29
Figure 4
Supply Current vs. Vcc
40
Vcc=3.3V
35 30 25 20 15 10 5 0
-25 0 25 50 75 100
Vcc Supply Current(uA)
28 27 26 25 24 23 22 21 20 -50
Supply Current(uA)
Temperature (C)
0
1
2
3
4
5
6
Vcc(V)
Figure 5 APX803
Document number: DS32132 Rev. 2 - 2
Figure 6
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APX803/D
3-PIN MICROPROCESSOR RESET CIRCUIT Typical 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 7
Nch Driver Output Current vs. VDS
80
100
Figure 8
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
V DS(V)
VDS(V)
Figure 9
Figure 10
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APX803/D
3-PIN MICROPROCESSOR RESET CIRCUIT Timing Diagram
Vth
Vcc
Vth
TDelay /RESET
Vth
TDelay
TDelay RESET
TDelay
Functional Description
Microprocessors (Ps) and microcontrollers (C) have a reset input to ensure that it starts up in a known state. The APX803/D 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 APX803D this period is a minimum of 1ms while for other APX803 variants it is at least 140ms. The APX803/D have an open-drain output stage. When VCC falls below 1V, the APX803/D 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 APX803/D 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 pullup resistor allows either device to assert reset.
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),
Supervising and monitoring Multiple Supplies
Generally, the pull-up resistor connected to the APX803/D will connect to the supply voltage that is being monitored at the IC's VCC pin. However, some systems may use the APX803/D 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 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.
APX803
Document number: DS32132 Rev. 2 - 2
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APX803/D
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
APX 8 03 D - 29 XX G - 7 Output type
03 : Active-Low, Open Drain
Voltage
29 : 2.93
Package
SA : SOT23 SR : SOT23R
Green
G : Green
Packing
7 : Tape & Reel
Device APX803-XXSAG-7 APX803-XXSRG-7 APX803D-29SAG-7 APX803D-29SRG-7
Notes:
Package Code SA SR SA SR
Packaging (Note 4) SOT23 SOT23R SOT23 SOT23R
7" Tape and Reel Quantity Part Number Suffix 3000/Tape & Reel -7 3000/Tape & Reel -7 3000/Tape & Reel -7 3000/Tape & Reel -7
4. 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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APX803/D
3-PIN MICROPROCESSOR RESET CIRCUIT Marking Information
(1) SOT23 and SOT23R
( Top View )
3 XX Y W X 1
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 APX803D-29SA APX803D-29SR
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
Package SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23R SOT23R SOT23R SOT23R SOT23R SOT23R SOT23R SOT23 SOT23R
Identification Code V3 V4 V5 V6 V7 V8 V9 S3 S4 S5 S6 S7 S8 S9 VN SN
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APX803/D
3-PIN MICROPROCESSOR RESET CIRCUIT Package Outline Dimensions (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. 2 - 2
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APX803/D
3-PIN MICROPROCESSOR RESET CIRCUIT
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