APX803 D

APX803/D
3-PIN MICROPROCESSOR RESET CIRCUIT
Description
Pin Assignments
The APX803/D is used for microprocessor (µP) supervisory
( Top View )
circuits to monitor the power supplies in µP and digital
systems. They provide excellent circuit reliability and low cost
GND
by eliminating external components and adjustments when
1
used with +5V, +3.3V, +3.0V powered circuits.
APX803
These circuits perform a single function: they assert a reset
RESET
signal on power up and whenever the VCC supply voltage
3
VCC
3
VCC
2
declines below a preset threshold, keeping it asserted for a
SOT23
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
( Top View )
the outputs are guaranteed to be in the correct logic state for
VCC down to 1V.
RESET
The APX803 is available with different reset thresholds
1
APX803
suitable for operation with a variety of supply voltages,
however the APX803D is available with a 2.93V threshold
GND
voltage.
The APX803/D have an open collector active low RESET
output and compliment Diodes APX809/10 which have push-
2
SOT23R
pull 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.
Features
Applications
•
•
•
•
•
•
•
•
•
•
•
•
•
•
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)
30µA 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)
Notes:
Computers
Controllers
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable/Battery Powered Equipment
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
CIN
100nF
V CC
V CC
APX803
Microprocessor
RESET
INPUT
RESET
GND
GND
Pin Descriptions
Pin Name
GND
Description
Ground
RESET
Reset Output Pin
Active Low Open Drain
VCC
Operating Voltage Input
Functional Block Diagram
VCC
Oscillator
Delay time
RESET
VREF
APX803
Document number: DS32132 Rev. 2 - 2
APX803/D
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APX803/D
3-PIN MICROPROCESSOR RESET CIRCUIT
Absolute Maximum Ratings
Symbol
Parameter
ESD HBM
Human Body Model ESD Protection
ESD MM
Machine Model ESD Protection
VCC
VRESET
Supply Voltage
RESET (open drain)
Rating
Unit
2
kV
200
V
-0.3 to +6.0
V
-0.3 to 6
V
ICC
Input Current, VCC
20
mA
IO
Output Current, RESET
Continuous Power Dissipation (TA = +70°C), derate 4mW/°C above +70°C
20
mA
400
mW
PD
TOP
Operating Junction Temperature Range
-40 to +105
°C
TST
Storage Temperature Range
-65 to +150
°C
Recommended Operating Conditions
Symbol
Parameter
Min
Max
Unit
1.1
5.5
V
VCC
Supply Voltage
VIN
Input Voltage
0
(VCC+0.3)
V
RESET output voltage
0
5.5
V
-40
85
°C
100
V/µs
VRESET
TA
dVCC/dt
Operating Ambient Temperature Range
VCC Rate of rise (VCC = 0~VT)
APX803
Document number: DS32132 Rev. 2 - 2
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APX803/D
3-PIN MICROPROCESSOR RESET CIRCUIT
Electrical Characteristics (TA = 25°C)
TA= -40 to 85°C unless otherwise note. Typical values are at TA=+25 °C.
Symbol
ICC
Parameter
Supply Current
Reset Threshold
VTH
Test Conditions
Min
VTH + 0.2V
VOL
IOH
30
40
μA
2.25
2.30
APX803-26
2.59
2.63
2.66
APX803-29
2.89
2.93
2.96
2.89
2.93
2.96
3.04
3.08
3.13
APX803-40
3.94
4.00
4.06
APX803-44
4.31
4.38
4.45
APX803-46
4.56
4.63
4.70
APX803D-29
APX803-31
VCC to RESET delay
Reset Active
Timeout Period
Unit
2.21
o
TA = 25 C
VTH-H – VTH-L
Reset Threshold Tempco
tDELAY
Max
APX803-23
Reset Threshold hysteresis
tS
Typ.
APX803-XX
APX803D-29
RESET Output Voltage Low
RESET Output High leakage
current
VCC = VTH to (VTH – 100mV)
o
o
TA = 0 C to +85 C
140
V
40
mV
30
ppm/°C
20
µs
200
1
280
3.3
VCC = VTH -0.2, ISINK = 1.2mA
0.3
VCC = VTH -0.2, ISINK = 3.5mA
0.4
VCC > 1.0V, ISINK = 50uA
0.3
VCC > VTH +0.2
1
ms
V
µA
θJA
Thermal Resistance Junction-toAmbient
SOT23/SOT23R (Note 2)
201
°C/W
θJC
Thermal Resistance
Junction-to-Case
SOT23/SOT23R (Note 2)
56
°C/W
Notes:
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.
APX803
Document number: DS32132 Rev. 2 - 2
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APX803/D
3-PIN MICROPROCESSOR RESET CIRCUIT
Typical Performance Characteristics
RESET Threshold Voltage vs. Temperature
RESET Threshold Voltage vs. Temperature
5.0
RESET Threshold Voltage(V
RESET Threshold Voltage(V
5.0
4.5
4.0
3.5
3.0
APX803-26
2.5
2.0
APX803-44
4.5
4.0
3.5
3.0
2.5
2.0
-50
-25
0
25
50
75
100
-50
100
RESET Timeout Period vs. Temperature
RESET Timeout Period(ms)
RESET Timeout Period(ms)
75
APX803
220
210
200
190
180
170
160
3.00
2.80
APX803D
2.60
2.40
2.20
2.00
1.80
1.60
1.40
1.20
1.00
-25
0
25
50
75
100
-50
-25
Temperature (°C)
0
25
50
75
100
5
6
Temperature (°C)
Figure 3
Figure 4
Supply Current vs. Temperature
Supply Current vs. Vcc
40
30
Vcc=3.3V
35
28
Supply Current(uA)
Vcc Supply Current(uA)
50
Figure 2
230
29
25
Figure 1
RESET Timeout Period vs. Temperature
150
-50
0
Temperature (°C)
250
240
-25
Temperature (°C)
27
26
25
24
23
22
25
20
15
10
5
21
20
-50
30
0
-25
0
25
50
75
100
Temperature (°C)
Document number: DS32132 Rev. 2 - 2
1
2
3
4
Vcc(V)
Figure 5
APX803
0
Figure 6
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APX803/D
3-PIN MICROPROCESSOR RESET CIRCUIT
Typical Performance Characteristics (Continued)
Nch Driver Sink Current vs. Vcc
Nch Driver Sink Current vs. Vcc
60
60
Sink Current Isink(mA)
Sink Current Isink(mA)
40
-40ºC
30
25ºC
20
85ºC
10
0
50
25ºC
40
30
85ºC
20
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
Figure 8
Nch Driver Output Current vs. VDS
Nch Driver Output Current vs. VDS
100
Nch Driver Output Current(mA)
80
Nch Driver Output Current(mA)
-40ºC
APX803-44 VDS=0.5V
APX803-26 VDS=0.5V
50
APX803-26
70
60
50
40
Vcc= 2.5V
30
20
Vcc= 2.0V
10
Vcc= 1.5V
0
APX803-44
90
Vcc= 4.0V
80
Vcc= 3.5V
70
60
Vcc= 3.0V
50
40
Vcc= 2.5V
30
20
Vcc= 2.0V
10
Vcc= 1.5V
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
0.0
Figure 9
APX803
Document number: DS32132 Rev. 2 - 2
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
VDS(V)
V DS(V)
Figure 10
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APX803/D
3-PIN MICROPROCESSOR RESET CIRCUIT
Timing Diagram
Vth
Vcc
Vth
TDelay
TDelay
TDelay
TDelay
/RESET
Vth
RESET
Functional Description
Microprocessors (µPs) and microcontrollers (µC) have a
reset input to ensure that it starts up in a known state.
The APX803/D drive the µP’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.
Since the RESET output on the APX803/D is open drain,
this device interfaces easily with μP/µC that have
Connecting the μP supervisor’s RESET output directly to
the microcontroller’s (μC’s) RESET pin with a single pull-
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 VCC returns
above the reset threshold, and RESET remains low for
the reset timeout period.
Document number: DS32132 Rev. 2 - 2
Interfacing to µP with Bidirectional Reset Pins
bidirectional reset pins, such as the Motorola 68HC11.
Ensuring a Valid Reset Output
Down to VCC = 0
APX803
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 µP and other circuitry is inoperative with VCC below
1V.
up resistor allows either device to assert reset.
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 µP powered by a
different supply voltage or monitor multiple supplies that
will be fed into 1 µC/µP reset input.
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APX803/D
3-PIN MICROPROCESSOR RESET CIRCUIT
Ordering Information
APX 8 03 - XX XX G - 7
Output type
Voltage
46
44
40
31
29
26
23
03 : Active-Low,
Open Drain
: 4.63
: 4.38
: 4.00
: 3.08
: 2.93
: 2.63
: 2.25
Package
Green
Packing
SA : SOT23
SR : SOT23R
G : Green
7 : Tape & Reel
APX 8 03 D - 29 XX G - 7
Device
Output type
Voltage
Package
Green
Packing
03 : Active-Low,
Open Drain
29 : 2.93
SA : SOT23
SR : SOT23R
G : Green
7 : Tape & Reel
Package Code
APX803-XXSAG-7
APX803-XXSRG-7
APX803D-29SAG-7
APX803D-29SRG-7
Notes:
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.
APX803
Document number: DS32132 Rev. 2 - 2
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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
APX803
Document number: DS32132 Rev. 2 - 2
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
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Identification Code
V3
V4
V5
V6
V7
V8
V9
S3
S4
S5
S6
S7
S8
S9
VN
SN
September 2010
© Diodes Incorporated
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
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APX803/D
3-PIN MICROPROCESSOR RESET CIRCUIT
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