APX809/810
Document number: DS31322 Rev. 5 - 3
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March 2017
© Diodes Incorporated
APX809/810
3-PIN MICROPROCESSOR RESET CIRCUITS
Description
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 package.
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: Available in “Green” Molding Compound (No Br, Sb)
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
(Top View)
SOT23 (SA Package)
(Top View)
SOT23 (SR Package)
Applications
Computers
Controllers
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable/Battery Powered Equipment
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit
NOT RECOMMENDED FOR NEW DESIGN
USE APX809S/810S
GND
RESET (RESET)
VCC
GND
RESET (RESET)
VCC
APX809/810
Document number: DS31322 Rev. 5 - 3
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March 2017
© Diodes Incorporated
APX809/810
Pin Descriptions
Functional Block Diagram
VREF
Delay Circuit Driver RESET
/ RESET
Absolute Maximum Ratings
Symbol
Parameter
Rating
Unit
ESD HBM
Human Body Model ESD Protection
5
kV
ESD MM
Machine Model ESD Protection
500
V
VCC
Supply Voltage
-0.3 to +6.0
V
VRESET
RESET,
RESET
(Push-pull)
-0.3 to (VCC + 0.3)
V
ICC
Input Current, VCC
20
mA
IO
Output Current, RESET,
RESET
20
mA
PD
Continuous Power Dissipation (TA = +70°C), De-rate
4mW/°C above +70°C
400
mW
TOP
Operating Junction Temperature Range
-40 to +105
°C
TST
Storage Temperature Range
-65 to +150
°C
Pin Name
Description
GND
Ground
RESET
(RESET)
Reset Output Pin
L: for APX809
H: for APX810
VCC
Operating Voltage Input
NOT RECOMMENDED FOR NEW DESIGN
USE APX809S/810S
APX809/810
Document number: DS31322 Rev. 5 - 3
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March 2017
© Diodes Incorporated
APX809/810
Recommended Operating Conditions
Symbol
Parameter
Min
Max
Unit
VCC
Supply Voltage
1.1
5.5
V
VIN
Input Voltage
0
(VCC + 0.3)
V
TA
Operating Ambient Temperature Range
-40
+85
oC
tR
VCC Rising Time (VCC = 0 to VT)
—
100
µs
Electrical Characteristics (@TA = -40 to +85°C, unless otherwise note. Typical values are at TA = +25°C.)
Symbol
Parameter
Test Conditions
Min
Typ
Max
Unit
VCC
VCC Range
TA = 0oC to +70oC
1.0
—
5.5
V
ICC
Supply Current
VTH + 0.2V
—
30
40
μA
VTH
Reset
Threshold
APX809/810-23
TA = 0oC to +85oC
2.21
2.25
2.30
V
APX809/810-26
2.59
2.63
2.69
APX809/810-29
2.88
2.93
3.00
APX809/810-31
3.02
3.08
3.15
APX809/810-40
3.93
4.00
4.08
APX809/810-44
4.31
4.38
4.47
APX809/810-46
4.56
4.63
4.72
APX809/810-23
TA = -40oC to +85oC
2.20
2.25
2.30
V
APX809/810-26
2.57
2.63
2.69
APX809/810-29
2.86
2.93
3.00
APX809/810-31
3.00
3.08
3.15
APX809/810-40
3.92
4.00
4.08
APX809/810-44
4.29
4.38
4.47
APX809/810-46
4.54
4.63
4.72
Reset Threshold Tempco
—
—
30
—
ppm/oC
tS
Set-up Time
VCC = VTH to (VTH - 100mV)
—
20
—
μs
tDELAY
Reset Active Timeout Period
TA = 0oC to +85oC
140
200
280
ms
VOL
TRESE
Output Voltage Low
(APX809)
VCC = VTH -0.2, ISINK = 1.2mA
—
—
0.3
V
VCC = VTH -0.2, ISINK = 3.2mA
—
—
0.4
VCC > 1.0V, ISINK = 50µA
—
—
0.3
VOH
TRESE
Output Voltage-High
(APX809)
VCC > VTH +0.2,
ISOURCE = 500µA
0.8VCC
—
—
V
VCC > VTH +0.2,
ISOURCE = 800µA
VCC - 1.5
—
—
VOL
RESET Output Voltage-Low
(APX810)
VCC = VTH +0.2, ISINK = 1.2mA
—
—
0.3
V
VCC = VTH +0.2, ISINK = 3.2mA
—
—
0.4
VOH
RESET Output Voltage-High
(APX810)
1.8V < VCC < VTH -0.2,
ISOURCE = 150µA
0.8VCC
—
—
V
θJA
Thermal Resistance Junction-to-
Ambient
SOT23 (Note 4)
—
201
—
oC/W
θJC
Thermal Resistance
Junction-to-Case
SOT23 (Note 4)
—
56
—
oC/W
Note: 4. Test condition for SOT23: Devices mounted on FR-4 substrate PC board, 2oz copper, with minimum recommended pad layout.
NOT RECOMMENDED FOR NEW DESIGN
USE APX809S/810S
APX809/810
Document number: DS31322 Rev. 5 - 3
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APX809/810
Performance Characteristics
RESET Timeout Period vs. Temperature
150
160
170
180
190
200
210
220
230
240
250
-40℃ -25℃ 0℃ 25℃ 50℃ 85℃ 105℃ 125℃
Temperature
RESET Timeout Period (mS)
RESET Threshold Voltage vs. Temperature
2.8
2.85
2.9
2.95
3
3.05
3.1
3.15
3.2
-40℃ -25℃ 0℃ 25℃ 50℃ 85℃ 105℃ 125℃
Temperature
RESET Thershold Voltage (V)
Vcc Supply Current vs. Temperature
(Vcc=3.3V Vth=2.93V)
25
26
27
28
29
30
31
32
33
34
35
-40℃ -25℃ 0℃ 25℃ 50℃ 85℃ 105℃ 125℃
Temperature
Vcc Supply Current (uA)
Timing Diagram
Vth
Vth
/RESET
RESET
TDelay
TDelay
TDelay
TDelay
Vcc
Vth
NOT RECOMMENDED FOR NEW DESIGN
USE APX809S/810S
Supply Current vs. Vcc
0
5
10
15
20
25
30
35
40
1.5V 2.5V 3.3V 4.0V 5.0V 5.5V
Vcc
Supply Current (uA)
APX809/810
Document number: DS31322 Rev. 5 - 3
5 of 8
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March 2017
© Diodes Incorporated
APX809/810
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.
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),
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.
When VCC falls below 1V, the APX809
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. However, in applications where
RESET
must be valid down to 0V, adding a pull down resistor to
RESET
causes any stray leakage currents to flow to ground, holding
RESET
low. R1’s value is not critical; 100k are large enough not to load
RESET
and small enough to pull
RESET
to ground. For the
APX810 if RESET is required to remain valid for VCC < 1V.
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.
Ordering Information
APX 8 XX - XX XX G - 7
Voltage Package Packing
7 : Tape & Reel
Enable Green
G : Green
SA/SR : SOT23
46 : 4.63
44 : 4.38
40 : 4.00
31 : 3.08
29 : 2.93
26 : 2.63
23 : 2.25
09 : Active-Low
10 : Active-High
Part Number
Package Code
Packaging
(Note 5)
7” Tape and Reel
Quantity
Part Number Suffix
APX809-XXSAG-7
SA
SOT23
3000/Tape & Reel
-7
APX810-XXSAG-7
SA
SOT23
3000/Tape & Reel
-7
APX809-XXSRG-7
SR
SOT23
3000/Tape & Reel
-7
APX810-XXSRG-7
SR
SOT23
3000/Tape & Reel
-7
Note: 5. Pad layout as shown in Diodes Incorporated’s package outline PDFs, which can be found on our website at http://www.diodes.com/package-outlines.html.
NOT RECOMMENDED FOR NEW DESIGN
USE APX809S/810S
APX809/810
Document number: DS31322 Rev. 5 - 3
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© Diodes Incorporated
APX809/810
Marking Information
(1) SOT23
1 2
3
XX Y W X
( Top View )
XX : Identification code
W : Week : A~Z : 1~26 week;
X : A~Z : Green
Y : Year 0~9
a~z : 27~52 week; z represents
52 and 53 week
Device
Package
Identification Code
APX809-46SA
SOT23
X2
APX809-44SA
SOT23
X3
APX809-40SA
SOT23
X4
APX809-31SA
SOT23
X5
APX809-29SA
SOT23
X6
APX809-26SA
SOT23
X7
APX809-23SA
SOT23
X8
APX810-46SA
SOT23
XA
APX810-44SA
SOT23
XB
APX810-40SA
SOT23
XC
APX810-31SA
SOT23
XD
APX810-29SA
SOT23
XE
APX810-26SA
SOT23
XF
APX810-23SA
SOT23
XG
APX809-46SR
SOT23
Y2
APX809-44SR
SOT23
Y3
APX809-40SR
SOT23
Y4
APX809-31SR
SOT23
Y5
APX809-29SR
SOT23
Y6
APX809-26SR
SOT23
Y7
APX809-23SR
SOT23
Y8
APX810-46SR
SOT23
YA
APX810-44SR
SOT23
YB
APX810-40SR
SOT23
YC
APX810-31SR
SOT23
YD
APX810-29SR
SOT23
YE
APX810-26SR
SOT23
YF
APX810-23SR
SOT23
YG
NOT RECOMMENDED FOR NEW DESIGN
USE APX809S/810S
APX809/810
Document number: DS31322 Rev. 5 - 3
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© Diodes Incorporated
APX809/810
Package Outline Dimensions
Please see http://www.diodes.com/package-outlines.html for the latest version.
SOT23
J
K1 K
L1
GAUGE PLANE
0.25
H
L
M
All 7°
A
CB
D
G
F
a
Suggested Pad Layout
Please see http://www.diodes.com/package-outlines.html for the latest version.
SOT23
X
Y
Y1 C
X1
SOT23
Dim
Min
Max
Typ
A
0.37
0.51
0.40
B
1.20
1.40
1.30
C
2.30
2.50
2.40
D
0.89
1.03
0.915
F
0.45
0.60
0.535
G
1.78
2.05
1.83
H
2.80
3.00
2.90
J
0.013
0.10
0.05
K
0.890
1.00
0.975
K1
0.903
1.10
1.025
L
0.45
0.61
0.55
L1
0.25
0.55
0.40
M
0.085
0.150
0.110
a
0°
8°
--
All Dimensions in mm
Dimensions
Value (in mm)
C
2.0
X
0.8
X1
1.35
Y
0.9
Y1
2.9
NOT RECOMMENDED FOR NEW DESIGN
USE APX809S/810S
APX809/810
Document number: DS31322 Rev. 5 - 3
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© Diodes Incorporated
APX809/810
IMPORTANT NOTICE
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
trademark rights, nor the rights of others. Any Customer or user of this document or products described herein 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 Diodes Incorporated
website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and
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indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings
noted herein may also be covered by one or more United States, international or foreign trademarks.
This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.
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Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any
use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its
representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2017, Diodes Incorporated
www.diodes.com
NOT RECOMMENDED FOR NEW DESIGN
USE APX809S/810S