Diodes APX809-29SR 3-pin microprocessor reset circuit Datasheet

APX809/810
3-PIN MICROPROCESSOR RESET CIRCUITS
General Description
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
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)
•
The APX809/810 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.
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 µP and µC 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
Lead Free
Packing
SA : SOT23
SR : SOT23R
G : Green
-7 : Taping
Device
Package
Code
Packaging
(Note 2)
Quantity
APX809-XXSA
APX810-XXSA
APX809-XXSR
APX810-XXSR
SA
SA
SR
SR
SOT23
SOT23
SOT23R
SOT23R
3000/Tape & Reel
3000/Tape & Reel
3000/Tape & Reel
3000/Tape & Reel
Notes:
7” Tape and Reel
Part Number Suffix
-7
-7
-7
-7
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.
APX809/810 Rev. 3
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APX809/810
3-PIN MICROPROCESSOR RESET CIRCUITS
Pin Assignments
( Top View )
GND
( Top View )
1
RESET (RESET)
APX809
APX810
RESET (RESET)
3
1
APX809
APX810
VCC
GND
2
3 VCC
2
SOT23
SOT23R
Pin Descriptions
Name
Description
GND
Ground
Reset Output Pin
L: for APX809
H: for APX810
RESET
(RESET)
VCC
Operating Voltage Input
Absolute Maximum Ratings
Symbol
VCC
VRESET
ICC
IO
Parameter
Supply Voltage
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
400
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
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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)
Electrical Characteristics
Min
Unit
KV
V
V
V
o
C
V/ uS
1.1
0
-40
5.5
(VCC+0.3)
85
100
(TA = 25ºC)
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,
ISOURCE = 500uA
RESE
T
Output
Voltage-High
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
θJA
SOT23/SOT23R (Note 3)
Junction-to-Ambient
Thermal Resistance
θJC
SOT23/SOT23R (Note 3)
Junction-to-Case
Notes:
Max
5
500
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
140
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
280
0.3
0.4
0.3
Unit
V
μA
V
V
ppm/ oC
μs
ms
V
0.8VCC
V
VCC –1.5
0.3
0.4
V
0.8 VCC
V
201
o
56
o
C/W
C/W
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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APX809/810
3-PIN MICROPROCESSOR RESET CIRCUITS
Typical Application Circuit
V CC
CIN
100nF
V CC
V CC
APX8XX
Microprocessor
RESET
INPUT
RESET
(RESET)
GND
GND
Functional Description
A microprocessor’s (µP’s) reset input starts the µP 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.
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
RESET must be valid down to 0V, adding a
pull down resistor to
RESET
causes any stray leakage
Ensuring a Valid Reset Output
Down to VCC = 0
currents to flow to ground, holding
RESET
not critical; 100k are large enough not to load
RESET
RESET to ground. For
RESET is required to remain valid for VCC < 1V.
the APX810 if
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
low for the reset timeout period.
RESET
remains
small enough to pull
RESET
low. R1’s value is
and
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.
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
RESET
/ RESET
VREF
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3-PIN MICROPROCESSOR RESET CIRCUITS
Performance Characteristics
RESET Threshold Voltage vs. Temperature
RESET Timeout Period vs. Temperature
3.2
RESET Thershold Voltage (V)
RESET Timeout Period (mS)
250
240
230
220
210
200
190
180
170
160
150
-40℃ -25℃
0℃
25℃
50℃
3.15
3.1
3.05
3
2.95
2.9
2.85
2.8
85℃ 105℃ 125℃
-40℃
Temperature
-25℃
25℃
50℃
85℃
105℃ 125℃
Temperature
Figure 1
Figure 2
Supply Current vs. Vcc
Vcc Supply Current vs. Temperature
(Vcc=3.3V Vth=2.93V)
35
40
34
35
Supply Current (uA)
Vcc Supply Current (uA)
0℃
33
32
31
30
29
28
27
30
25
20
15
10
5
26
25
0
-40℃
-25℃
0℃
25℃
50℃
85℃
105℃ 125℃
Temperature
2.5V
3.3V
4.0V
5.0V
5.5V
Vcc
Figure 3
APX809/810 Rev. 3
1.5V
Figure 4
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APX809/810
3-PIN MICROPROCESSOR RESET CIRCUITS
Timing Diagram
Vth
Vcc
Vth
TDelay
TDelay
TDelay
TDelay
/RESET
Vth
RESET
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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
APX809/810 Rev. 3
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
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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
MARCH 2008
© Diodes Incorporated
APX809/810
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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