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APX811, APX812 Datasheet

Diodes Incorporated

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Datasheet

APX811/812
4-Pin Microprocessor Supervisor With Manual Reset
APX811/812 Rev. 2 1 of 10 OCTOBER 2009
DS31960 www.diodes.com © Diodes Incorporated
Precision Monitor of(2.5V/3.0V/3.3V/5.0V) power
supply voltage
Full specified over temperature
Manual reset input
Available in four output configuration
Push-pull
RESET Active low(APX811)
Push-pull RESET Active high(APX812)
Power-on reset generator with fixed delay time 200ms
SOT143: Available in “Green” Molding Compound
(No Br, Sb)
Lead Free Finish/RoHS Compliant (Note 1)
The APX811/812 are used for microprocessor supervisory circuit
to monitor the power supplies in These circuit 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 APX811/812 have push-pull outputs.
The APX811 has an active low RESET output, while the
APX812 has an active high RESET output.
The APX811/812 devices incorporate a manual reset input, MR .
A low level at MR causes RESET to become active.
The APX811/2 are targeted at 2.5V, 3V, 3.3V and 5V powered
systems and are available with different threshold voltages to
meet the exact needs of the system. They are available in the
space saving SOT143 package and operate over the whole
industrial temperature range, -40 to 85°C.
Computers
Controllers
Intelligent Instruments
Critical uP and UC power Monitoring
Portable/Battery powered Equipment
Automotive
Typical Application Circuit
Vcc
MCU
MR RESET
(RESET)
RESET Input
GND
APX811/APX812
Vcc
GND
Vcc
(Manual Reset)
Push Botton
Features General Description
Applications
APX811/812
4-Pin Microprocessor Supervisor With Manual Reset
APX811/812 Rev. 2 2 of 10 OCTOBER 2009
DS31960 www.diodes.com © Diodes Incorporated
APX 8 XX - XX U G - 7
Voltage Package Packing
7 : Tape & Reel
Enable Green
G : Green
U : SOT143
46 : 4.63
44 : 4.38
40 : 4.00
31 : 3.08
29 : 2.93
26 : 2.63
23 : 2.25
11 : Active-Low
12 : Active-High
7” Tape and Reel
Device Package
Code Packaging
(Note 2) Quantity Part Number Suffix
APX811-XXUG-7 U SOT143 3000/Tape & Reel -7
APX812-XXUG-7 U SOT143 3000/Tape & Reel -7
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.
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.
1
2
4
MR
3
GND
( Top View )
Vcc
(RESET)
SOT143
RESET
Pin Name Description
GND Ground
RESET
(RESET)
Reset output Pin
L: for APX811
H: for APX812
VCC Operating Voltage Input
MR Manual reset (Active Low)
Ordering Information
Pin Assignments
Pin Descriptions
APX811/812
4-Pin Microprocessor Supervisor With Manual Reset
APX811/812 Rev. 2 3 of 10 OCTOBER 2009
DS31960 www.diodes.com © Diodes Incorporated
Block Diagram
Vcc RESET
MR
Vref
Delay Circuit Driver
Absolute Maximum Ratings
Symbol Parameter Rating Unit
ESD HBM Human Body Model ESD protection 3 kV
ESD MM Machine Model ESD Protection 500 V
VCC Supply voltage -0.3~7 V
VRESET RESET -0.3 to (Vcc+0.3) V
ICC Input Current, Vcc 20 mA
IO Output current 20 mA
PD Power dissipation 320 mW
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 -40 85 oC
APX811/812
4-Pin Microprocessor Supervisor With Manual Reset
APX811/812 Rev. 2 4 of 10 OCTOBER 2009
DS31960 www.diodes.com © Diodes Incorporated
Electrical Characteristics (TA = 25ºC)
TA= -40 to 85 oC unless otherwise note. Typical values are at TA=+25 oC.
Symbol Parameter Test Conditions Min Typ. Max Unit
VCC V
CC Range 1.0 5.5 V
ICC Supply Current Vth + 0.2V 30 40 µA
2.22 2.25 2.28 V
2.59 2.63 2.67 V
2.89 2.93 2.98 V
3.03 3.08 3.13 V
3.94 4.00 4.06 V
4.31 4.38 4.45 V
Vth Reset threshold TA =25 oC.
4.56 4.63 4.70 V
ts Set-up Time VCC = Vth to (Vth – 100mV) 20 µs
VCC = Vth -0.2, ISINK = 1.2mA 0.3
VCC = Vth -0.2, ISINK = 3.2mA 0.4
VOL TRESE Output Voltage Low
(APX811) VCC > 1.0V, ISINK = 50uA 0.3
V
VCC > Vth +0.2,
ISOURCE = 500uA 0.8VCC
VOH TRESE Output Voltage-High
(APX811) VCC > Vth +0.2,
ISOURCE = 800uA VCC –1.5
V
VCC = Vth +0.2, ISINK = 1.2mA 0.3
VOL RESET Output Voltage-Low
(APX812) VCC = Vth +0.2, ISINK = 3.2mA 0.4
V
VOH RESET Output Voltage-High
(APX812) 1.8V < VCC < Vth -0.2,
ISOURCE = 150uA 0.8 VCC V
θJA Thermal Resistance
Junction-to-Ambient SOT143 (Note 3) 240 oC/W
θJC
T
hermal Resistance
Junction-to-Case SOT143 (Note 3) 71 oC/W
Notes: 3. Test condition for SOT143: Device mounted on FR-4 substrate, 1"*1", 2oz, copper, single-sided, PC boards.
Timing requirements (TA=25oC)
Symbol Parameter Test Conditions Min Typ. Max Unit
tW Pulse Width at MR VCC> Vth-+0.2V, VIL=0.3
×
VCC, VIH=0.7
×
VCC 100 - - ns
APX811/812
4-Pin Microprocessor Supervisor With Manual Reset
APX811/812 Rev. 2 5 of 10 OCTOBER 2009
DS31960 www.diodes.com © Diodes Incorporated
Switching Characteristics (TA=25oC)
Symbol Parameter Test Conditions Min Typ. Max Unit
td Delay Time APX811/812 VCC> Vth-+0.2V,
See timing diagram 140 200 280 ms
MR to RESET
delay (APX811/812)
VCC> Vth-+0.2V,
VIL=0.3
×
VCC,
VIH=0.7
×
VCC - - 0.1 µs
tPHL Propagation (Delay) Time,
High-to-low-level Output
VCC to RESET delay VIL= Vth--0.2V,
VIH= Vth-+0.2V - - 25 µs
MR to RESET delay
(APX811/812)
VCC> Vth-+0.2V,
VIL=0.3
×
VCC,
VIH=0.7
×
VCC - - 0.1 µs
tPLH Propagation (Delay) Time,
Low-to-high-level Output VCC to RESET delay
(APX811/812) VIL= Vth--0.2V,
VIH= Vth-+0.2V - - 25 µs
Timing Diagram
Vth
Vth
/RESET
Vth
RESET
td
Vcc
RESET vs. Vcc Timing Diagram
tdtd
td
/MR
Vcc
Vth
/RESET
RESET vs. /MR Timing Diagram
td
td
APX811/812
4-Pin Microprocessor Supervisor With Manual Reset
APX811/812 Rev. 2 6 of 10 OCTOBER 2009
DS31960 www.diodes.com © Diodes Incorporated
Typical 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 (µA
Supply Curreny 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 (µA
APX811/812
4-Pin Microprocessor Supervisor With Manual Reset
APX811/812 Rev. 2 7 of 10 OCTOBER 2009
DS31960 www.diodes.com © Diodes Incorporated
Application Information
A microprocessor’s (µP’s) reset input starts the µP in a known state. The APX811/812 asserts 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 or the MR pin is brought low, keeping it asserted for at least 240ms after VCC has risen above the reset threshold. The
APX811/812 have a push-pull output stage.
The APX811/812 reset output is guaranteed to be logic low for the APX811 and high the APX812 for VCC > 1V. Once VCC exceeds the
reset threshold, an internal timer keeps RESET output low (and RESET high for the APX812) for the reset timeout period. After this
interval, the APX811’s RESET output goes high (APX812’s RESET output goes low). If a brownout condition occurs (VCC dips below the
reset threshold), the APX811’s RESET output goes low (APX812’s RESET output goes high). Any time VCC goes below the reset
threshold, the internal timer resets to zero, and RESET goes low (RESET goes high). The internal timer starts after VCC returns above
the reset threshold, and RESET remains low (RESET remains high) for the reset timeout period.
Ensuring a Valid Reset Output Down to VCC = 0
When VCC falls below 1V, the APX811 RESET 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 is
large enough not to load RESET and small enough to pull RESET to ground.
For the APX812 if RESET is required to remain valid for VCC < 1V then a 100k pull-up resistor between RESET and VCC is
recommended.
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.
APX811/812
4-Pin Microprocessor Supervisor With Manual Reset
APX811/812 Rev. 2 8 of 10 OCTOBER 2009
DS31960 www.diodes.com © Diodes Incorporated
Marking Information
(1) SOT143
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
4
Device Package Identification Code
APX811-46U SOT143 C2
APX811-44U SOT143 C3
APX811-40U SOT143 C4
APX811-31U SOT143 C5
APX811-29U SOT143 C6
APX811-26U SOT143 C7
APX811-23U SOT143 C8
APX812-46U SOT143 C9
APX812-44U SOT143 CA
APX812-40U SOT143 CB
APX812-31U SOT143 CC
APX812-29U SOT143 CD
APX812-26U SOT143 CE
APX812-23U SOT143 CF
APX811/812
4-Pin Microprocessor Supervisor With Manual Reset
APX811/812 Rev. 2 9 of 10 OCTOBER 2009
DS31960 www.diodes.com © Diodes Incorporated
Package Information (All Dimensions in mm)
(1) Package Type: SOT143
1.20/1.40
2.28/2.48
2.80/3.0
1.58/1.83
1.78/2.03
0.89/1.0
0.37/0.51
0.77/0.93
0.013/0.10
0.46/0.6
0.085/0.18
8°typ.
0.45/0.6
APX811/812
4-Pin Microprocessor Supervisor With Manual Reset
APX811/812 Rev. 2 10 of 10 OCTOBER 2009
DS31960 www.diodes.com © Diodes Incorporated
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.
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LIFE SUPPORT
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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.
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Copyright © 2009, Diodes Incorporated
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