APX811 812

APX811/812
4-Pin Microprocessor Supervisor With Manual Reset
General Description
Features
•
•
•
•
•
•
•
•
•
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.
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 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.
Applications
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•
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Computers
Controllers
Intelligent Instruments
Critical uP and UC power Monitoring
Portable/Battery powered Equipment
Automotive
Typical Application Circuit
Vcc
Vcc
Vcc
APX811/APX812
MR
(Manual Reset)
Push Botton
APX811/812 Rev. 2
DS31960
GND
RESET
(RESET)
1 of 10
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MCU
RESET Input
GND
OCTOBER 2009
© Diodes Incorporated
APX811/812
4-Pin Microprocessor Supervisor With Manual Reset
Ordering Information
APX 8 XX - XX U G - 7
Enable
Voltage
11 : Active-Low
12 : Active-High
Device
APX811-XXUG-7
APX812-XXUG-7
Notes:
46
44
40
31
29
26
23
: 4.63
: 4.38
: 4.00
: 3.08
: 2.93
: 2.63
: 2.25
Package
Green
Packing
U : SOT143
G : Green
7 : Tape & Reel
Package
Code
Packaging
(Note 2)
U
U
SOT143
SOT143
7” Tape and Reel
Quantity
Part Number Suffix
3000/Tape & Reel
3000/Tape & Reel
-7
-7
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.
Pin Assignments
( Top View )
GND
1
4
Vcc
RESET (RESET)
2
3
MR
SOT143
Pin Descriptions
Pin Name
GND
RESET
(RESET)
VCC
MR
Description
Ground
Reset output Pin
L: for APX811
H: for APX812
Operating Voltage Input
Manual reset (Active Low)
APX811/812 Rev. 2
DS31960
2 of 10
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OCTOBER 2009
© Diodes Incorporated
APX811/812
4-Pin Microprocessor Supervisor With Manual Reset
Block Diagram
Driver
Vcc
Delay Circuit
RESET
Vref
MR
Absolute Maximum Ratings
Symbol
Parameter
ESD HBM Human Body Model ESD protection
ESD MM
VCC
VRESET
Machine Model ESD Protection
Supply voltage
RESET
Rating
Unit
3
kV
500
V
-0.3~7
V
-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
VCC
VIN
TA
Parameter
Supply Voltage
Input Voltage
Operating Ambient Temperature
APX811/812 Rev. 2
DS31960
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Min
1.1
0
-40
Max
5.5
(VCC+0.3)
85
Unit
V
V
o
C
OCTOBER 2009
© Diodes Incorporated
APX811/812
4-Pin Microprocessor Supervisor With Manual Reset
Electrical Characteristics
(TA = 25ºC)
TA= -40 to 85 oC unless otherwise note. Typical values are at TA=+25 oC.
Symbol
Parameter
Test Conditions
VCC
VCC Range
ICC
Supply Current
Vth + 0.2V
Reset threshold
Vth
ts
TA =25 C.
VCC = Vth to (Vth – 100mV)
VCC = Vth -0.2, ISINK = 1.2mA
RESET Output Voltage Low
VCC = Vth -0.2, ISINK = 3.2mA
(APX811)
VCC > 1.0V, ISINK = 50uA
VCC > Vth +0.2,
RESET Output Voltage-High ISOURCE = 500uA
(APX811)
VCC > Vth +0.2,
ISOURCE = 800uA
VCC = Vth +0.2, ISINK = 1.2mA
RESET Output Voltage-Low
(APX812)
VCC = Vth +0.2, ISINK = 3.2mA
RESET Output Voltage-High 1.8V < VCC < Vth -0.2,
(APX812)
ISOURCE = 150uA
Thermal Resistance
SOT143 (Note 3)
Junction-to-Ambient
Thermal Resistance
SOT143 (Note 3)
Junction-to-Case
VOH
VOL
VOH
θJA
θJC
Typ.
Unit
V
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
4.56
4.63
4.70
V
20
µs
0.3
0.4
0.3
V
0.8VCC
V
VCC –1.5
0.3
0.4
V
0.8 VCC
V
240
o
C/W
71
o
C/W
3. Test condition for SOT143: Device mounted on FR-4 substrate, 1"*1", 2oz, copper, single-sided, PC boards.
Timing requirements
Symbol
tW
30
Max
5.5
40
Set-up Time
VOL
Notes:
o
Min
1.0
Parameter
Pulse Width
APX811/812 Rev. 2
DS31960
at MR
(TA=25oC)
Test Conditions
VCC> Vth-+0.2V, VIL=0.3 × VCC, VIH=0.7 × VCC
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Min Typ. Max Unit
100
-
-
ns
OCTOBER 2009
© Diodes Incorporated
APX811/812
4-Pin Microprocessor Supervisor With Manual Reset
Switching Characteristics
Symbol
td
tPHL
(TA=25oC)
Parameter
Delay Time
Test Conditions
APX811/812
MR to RESET
Propagation (Delay) Time, delay (APX811/812)
High-to-low-level Output
VCC to RESET delay
tPLH
MR to RESET delay
Propagation (Delay) Time, (APX811/812)
Low-to-high-level Output
VCC to RESET delay
(APX811/812)
VCC> Vth-+0.2V,
See timing diagram
VCC> Vth-+0.2V,
VIL=0.3 × VCC,
VIH=0.7 × VCC
VIL= Vth--0.2V,
VIH= Vth-+0.2V
VCC> Vth-+0.2V,
VIL=0.3 × VCC,
VIH=0.7 × VCC
VIL= Vth--0.2V,
VIH= Vth-+0.2V
Min Typ. Max Unit
140
200
280
ms
-
-
0.1
µs
-
-
25
µs
-
-
0.1
µs
-
-
25
µs
Timing Diagram
RESET vs. Vcc Timing Diagram
Vth
Vcc
Vth
td
td
td
td
/RESET
Vth
RESET
RESET vs. /MR Timing Diagram
Vth
Vcc
/MR
td
td
/RESET
APX811/812 Rev. 2
DS31960
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© Diodes Incorporated
APX811/812
4-Pin Microprocessor Supervisor With Manual Reset
Typical Performance Characteristics
RESET Timeout Period vs. Temperature
RESET Threshold Voltage vs. Temperature
3.2
RESET Thershold Voltage (V)
RESET Timeout Period (ms)
250
240
230
220
210
200
190
180
170
160
3.15
3.1
3.05
3
2.95
2.9
2.85
2.8
150
-40℃ -25℃ 0℃
-40℃ -25℃
25℃ 50℃ 85℃ 105℃ 125℃
Temperature
25℃ 50℃ 85℃ 105℃ 125℃
Temperature
Vcc Supply Current vs. Temperature
(Vcc=3.3V Vth=2.93V)
Supply Curreny vs. Vcc
35
40
34
35
33
Supply Current (µA)
Vcc Supply Current (µA)
0℃
32
31
30
29
28
27
30
25
20
15
10
5
26
25
-40℃ -25℃
0℃
25℃ 50℃ 85℃ 105℃ 125℃
1.5V
2.5V
3.3V
4.0V
5.0V
5.5V
Vcc
Temperature
APX811/812 Rev. 2
DS31960
0
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© Diodes Incorporated
APX811/812
4-Pin Microprocessor Supervisor With Manual Reset
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 100kΩ 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 Rev. 2
DS31960
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APX811/812
4-Pin Microprocessor Supervisor With Manual Reset
Marking Information
(1) SOT143
( Top View )
4
3
XX Y W X
1
2
Device
APX811-46U
APX811-44U
APX811-40U
APX811-31U
APX811-29U
APX811-26U
APX811-23U
APX812-46U
APX812-44U
APX812-40U
APX812-31U
APX812-29U
APX812-26U
APX812-23U
APX811/812 Rev. 2
DS31960
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
SOT143
SOT143
SOT143
SOT143
SOT143
SOT143
SOT143
SOT143
SOT143
SOT143
SOT143
SOT143
SOT143
SOT143
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Identification Code
C2
C3
C4
C5
C6
C7
C8
C9
CA
CB
CC
CD
CE
CF
OCTOBER 2009
© Diodes Incorporated
APX811/812
4-Pin Microprocessor Supervisor With Manual Reset
Package Information
(All Dimensions in mm)
(1) Package Type: SOT143
2.80/3.0
APX811/812 Rev. 2
DS31960
.
0.085/0.18
9 of 10
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0.46/0.6
yp
0.37/0.51
8° t
0.77/0.93
0.013/0.10
0.89/1.0
1.58/1.83
2.28/2.48
0.45/0.6
1.20/1.40
1.78/2.03
OCTOBER 2009
© Diodes Incorporated
APX811/812
4-Pin Microprocessor Supervisor With Manual Reset
IMPORTANT NOTICE
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DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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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:
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A critical component is any component in a life support device or system whose failure to perform can be reasonably expected
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Copyright © 2009, Diodes Incorporated
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APX811/812 Rev. 2
DS31960
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OCTOBER 2009
© Diodes Incorporated
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