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APX811/812
4-Pin Microprocessor Supervisor With Manual Reset
Features
* * * * * * * * * 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)
General Description
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 85C.
Applications
* * * * * * 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 GND RESET (RESET)
MCU RESET Input GND
APX811/812 Rev. 2 DS31960
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4-Pin Microprocessor Supervisor With Manual Reset
Ordering Information
APX 8 XX - XX U G - 7
Enable
11 : Active-Low 12 : 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
U : SOT143
Green
G : Green
Packing
7 : Tape & Reel
Device
APX811-XXUG-7 APX812-XXUG-7
Notes:
Package Code
U U
Packaging (Note 2)
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 ) 1 4 Vcc
GND
RESET (RESET)
2 SOT143
3
MR
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)
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4-Pin Microprocessor Supervisor With Manual Reset
Block Diagram
Vcc Vref
Driver Delay Circuit RESET
MR
Absolute Maximum Ratings
Symbol Parameter Rating Unit
ESD HBM Human Body Model ESD protection ESD MM VCC VRESET ICC IO PD Machine Model ESD Protection Supply voltage RESET Input Current, Vcc Output current Power dissipation
3 500 -0.3~7 -0.3 to (Vcc+0.3) 20 20 320
kV V V V mA mA mW
Recommended Operating Conditions
Symbol VCC VIN TA Parameter Supply Voltage Input Voltage Operating Ambient Temperature Min 1.1 0 -40 Max 5.5 (VCC+0.3) 85 Unit V V o C
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Electrical Characteristics
(TA = 25C)
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
Min 1.0
Typ.
30 2.22 2.59 2.89 2.25 2.63 2.93 3.08 4.00 4.38 4.63 20
Max 5.5 40
Unit V A
2.28 2.67 2.98 3.13 4.06 4.45 4.70 0.3 0.4 0.3
V V V V V V V s V
Vth
Reset threshold
TA =25 C.
o
3.03 3.94 4.31 4.56
ts
VOL
VOH
VOL VOH JA JC
Notes:
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
Set-up Time
0.8VCC V VCC -1.5 0.3 0.4 0.8 VCC 240 71
o
V V C/W C/W
o
3. Test condition for SOT143: Device mounted on FR-4 substrate, 1"*1", 2oz, copper, single-sided, PC boards.
Timing requirements
Symbol Parameter
(TA=25oC)
Test Conditions
Min Typ. Max Unit
tW
Pulse Width
at MR
VCC> Vth-+0.2V, VIL=0.3x VCC, VIH=0.7 x VCC
100
-
-
ns
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4-Pin Microprocessor Supervisor With Manual Reset
Switching Characteristics
Symbol
(TA=25oC)
Parameter
Test Conditions
Min Typ. Max Unit
td
Delay Time
APX811/812
tPHL
MR to RESET Propagation (Delay) Time, delay (APX811/812) High-to-low-level Output VCC to RESET delay
MR to RESET delay Propagation (Delay) Time, (APX811/812) Low-to-high-level Output VCC to RESET delay (APX811/812)
tPLH
VCC> Vth-+0.2V, See timing diagram VCC> Vth-+0.2V, VIL=0.3x VCC, VIH=0.7x VCC VIL= Vth--0.2V, VIH= Vth-+0.2V VCC> Vth-+0.2V, VIL=0.3x VCC, VIH=0.7x VCC VIL= Vth--0.2V, VIH= Vth-+0.2V
140 -
200 -
280 0.1 25 0.1 25
ms s s s s
Timing Diagram
RESET vs. Vcc Timing Diagram
Vth
Vcc
Vth
td
td
/RESET
Vth
td
td
RESET
RESET vs. /MR Timing Diagram
Vth
Vcc
/MR td /RESET td
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4-Pin Microprocessor Supervisor With Manual Reset
Typical Performance Characteristics
RESET Timeout Period vs. Temperature
250 240 230 220 210 200 190 180 170 160 150 -40 -25 0 25 50 85 105 125
3.2
RESET Threshold Voltage vs. Temperature RESET Thershold Voltage (V)
RESET Timeout Period (ms)
3.15 3.1 3.05 3 2.95 2.9 2.85 2.8 -40 -25 0 25 50 85 105 125
Temperature
Temperature
Vcc Supply Current vs. Temperature (Vcc=3.3V Vth=2.93V)
35
Supply Curreny vs. Vcc
40 35
Vcc Supply Current (A)
34
Supply Current (A)
-40 -25 0 25 50 85 105 125
33 32 31 30 29 28 27 26 25
30 25 20 15 10 5 0 1.5V 2.5V 3.3V 4.0V 5.0V 5.5V
Temperature
Vcc
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Application Information
A microprocessor's (P's) reset input starts the P 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 P 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 P 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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4-Pin Microprocessor Supervisor With Manual Reset
Marking Information
(1) SOT143
( Top View )
4
3
XX Y W X 1 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
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
Package SOT143 SOT143 SOT143 SOT143 SOT143 SOT143 SOT143 SOT143 SOT143 SOT143 SOT143 SOT143 SOT143 SOT143
Identification Code C2 C3 C4 C5 C6 C7 C8 C9 CA CB CC CD CE CF
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4-Pin Microprocessor Supervisor With Manual Reset
Package Information
(1) Package Type: SOT143
(All Dimensions in mm)
1.78/2.03
0.45/0.6
0.89/1.0
0.085/0.18
1.58/1.83
1.20/1.40
2.28/2.48
0.013/0.10
2.80/3.0
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8 t
yp
0.77/0.93
0.37/0.51
0.46/0.6
.
OCTOBER 2009 (c) Diodes Incorporated
APX811/812
4-Pin Microprocessor Supervisor With Manual Reset
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