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APX823/APX824/APX825A
PROCESSOR SUPERVISORY CIRCUITS
Features
* * * * * * * * * Power-on reset generator with fixed delay time of 200ms Typ Manual reset input (APX823/APX825A) Reset output available in active-Low (APX823/APX824/APX825A), active-high (APX824/APX825A) Supply voltage supervision range 2.5V, 3V, 3.3V, 5V Watchdog timer Supply current of 30A (Typ.) Temperature range: -40C to 85C SOT25 and SOT26: Available in "Green" Molding Compound (No Br, Sb) Lead Free Finish/RoHS Compliant (Note 1)
General Description
The APX823/APX824/APX825A family of supervisors provides circuit initialization and timing supervision, primarily for DSP and processor-based systems. During power-on,
RESET
is asserted when supply voltage VCC becomes higher than 1.1V. Thereafter, the supply voltage supervisor
monitors VCC and keeps RESET active as long as VCC remains below the threshold voltage VTH-. An internal timer delays the return of the output to the inactive state (high) to ensure proper system reset. The delay time ,td, starts after VCC has risen above the threshold voltage VTH-. When the supply voltage drops below the threshold voltage VTH-, the output becomes active (low) again. No external components are required. All the devices of this family have a fixed-sense threshold voltage VTH- set by an internal voltage divider. The APX823/APX825A devices incorporate a manual reset input, MR . A low level at MR causes RESET to become active. The APX824/APX825A devices include a high-level output RESET. APX823/APX824/APX825A have a watchdog timer that is periodically triggered by a positive or negative transition at WDI. When the supervising system fails to retrigger the watchdog circuit within the time-out interval, ttout, RESET becomes active for the time period td. This event also reinitializes the watchdog timer. Leaving WDI unconnected disables the watchdog. In applications where the input to the WDI pin may be active (transitioning high and low) when the APX823/APX824/APX825A asserting
RESET , the APX823/APX824/APX825A does not return to a non-reset state when the input voltage is above Vt.
The product spectrum is designed for supply voltage of 2.5V, 3V, 3.3V and 5V. The circuits are available in a SOT25 and SOT26 o o packages. The APX823/APX824/APX825A devices are characterized for operation over a temperature range of -40 C to 105 C.
Applications
* * * * * * * * Applications Using DSPs, Microcontrollers, or Microprocessors Industrial Equipment Programmable Controls Automotive Systems Portable/Battery-Powered Equipment Intelligent Instruments Wireless Communications Systems Notebook/Desktop Computers
APX823/APX824/APX825A Rev. 3
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APX823/APX824/APX825A
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Ordering Information
APX82 XX - XX XX G - 7 Part No. 3 : APX823 4 : APX824 5A : APX825A Voltage 46 : 4.63 44 : 4.38 40 : 4.00 31 : 3.08 29 : 2.93 26 : 2.63 23 : 2.25 Package W5 : SOT25 W6 : SOT26 Green G : Green Packing 7 : Tape & Reel
Device
APX823-XXW5G-7 APX824-XXW5G-7 APX825A-XXW6G-7
Notes:
Package Code W5 W5 W6
Packaging (Note 2) SOT25 SOT25 SOT26
7" Tape and Reel Quantity Part Number Suffix 3000/Tape & Reel -7 3000/Tape & Reel -7 3000/Tape & Reel -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) RESET 1 APX823 4 WDI SOT25 5 VCC
RESET 1 GND 2 RESET 3 SOT25 APX824 4 WDI (Top View) 5 VCC
RESET 1 GND 2 RESET 3 SOT26 APX825A (Top View) 6 VCC 5 WDI 4 MR
GND 2 MR 3
APX823/APX824/APX825A Rev. 3
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Pin Descriptions
Pin Name GND
RESET
Description
Ground Reset output pin Operating voltage input Watchdog input Manual reset
(RESET) VCC WDI
MR
Absolute Maximum Ratings
(Over operating ambient temperature range, unless otherwise noted)*
Symbol ESD HBM ESD MM VCC VRESET ICC IO
Parameter Human Body Model ESD Protection Machine Model ESD Protection Supply Voltage
RESET, RESET , MR , WDI Input Current VCC Maximum High Output Current Derating Factor Above TA = 25oC Continuous Total Power Dissipation TA = 25oC Power Rating TA = 70oC Power Rating TA = 85oC Power Rating
PD
SOT25 SOT26 SOT25 SOT26 SOT25 SOT26 SOT25 SOT26
TOP TST
Operating Junction Temperature Range Storage Temperature Range
Rating 5 200 6.0 -0.3 to (VCC+0.3) 20 20 6.2 5.8 500 470 220 210 125 120 -40 to 105 -65 to 150
Unit KV V V V mA mA
mW/C mW mW mW C C
* Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
APX823/APX824/APX825A Rev. 3
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Recommended Operating Conditions
Symbol VCC VIN VIH VIL t/V TA TR Parameter Min 1.1 0 0.7 x VCC -40 Max 5.5 (VCC+0.3) 0.3 x VCC 100 85 100 Unit V V V V ns/V o C V/ uS
Supply Voltage Input Voltage High-level Input Voltage at MR and WDI Low-level Voltage Input Transition Rise and Fall Rate at MR or WDI Operating Ambient Temperature Range VCC Rising Time (VCC = 0~VT)
Electrical Characteristics
(Over recommended operating ambient temperature range, unless otherwise noted) Test Symbol Parameter Min Conditions APX823/APX824/APX825A VCC= VTH-+0.2V
-29/26/23 APX823/APX824/APX825A RESET -40/31 APX823/APX824/APX825A -46/44 APX824/APX825A -29/26/23 RESET APX824/APX825A -46/44/40/31 APX824/APX825A -29/26/23 RESET APX824/APX825A -40/31 Low-level Output Voltage APX824/APX825A -46/44 APX823/APX824/APX825A -29/26/23 APX823/APX824/APX825A RESET -40/31 APX823/APX824/APX825A -46/44 IOH=-20A VCC= VTH-+0.2V IOH=-30A 0.8xVCC
Typ.
Max
Unit
-
-
V
VOH
High-level Output Voltage
VCC= VTH-+0.2V VCC-1.5V IOH=-120A VCC > 1.8V, IOH = -100A 0.8xVCC VCC > 1.8V, IOH = -150A VCC= VTH-+0.2V IOL=1mA VCC= VTH-+0.2V IOL=1.2mA VCC= VTH-+0.2V IOL=3mA VCC= VTH--0.2V IOL=1mA VCC= VTH--0.2V IOL=1.2mA VCC= VTH--0.2V IOL=3mA VCC > 1.1V, IOL=20A -
-
-
V
-
-
V
-
0.4
V
VOL
-
-
0.4
V
VRESET
Notes:
Power-up Reset Voltage (see Note 3)
-
-
0.4
V
3. The lowest supply voltage at which RESET becomes active. TR , VCC > 15s/V.
APX823/APX824/APX825A Rev. 3
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Electrical Characteristics
(Continued)
(Over recommended operating ambient temperature range, unless otherwise noted) Symbol Parameter Test Conditions Min APX823/APX824/APX825A -23 2.21 APX823/APX824/APX825A -26 2.59 APX823/APX824/APX825A -29 2.88 APX823/APX824/APX825A -31 TA = 0oC -85oC 3.02 APX823/APX824/APX825A -40 3.93 4.31 Negative-going APX823/APX824/APX825A -44 4.56 Input Threshold APX823/APX824/APX825A -46 VTHVoltage APX823/APX824/APX825A -23 2.20 (see Note 4) APX823/APX824/APX825A -26 2.57 APX823/APX824/APX825A -29 2.86 APX823/APX824/APX825A -31 TA= -40oC -85oC 3.00 APX823/APX824/APX825A -40 3.92 APX823/APX824/APX825A -44 4.29 APX823/APX824/APX825A -46 4.54 APX823/APX824/APX825A -23 APX823/APX824/APX825A -26 APX823/APX824/APX825A -29 Hysteresis at Vhys APX823/APX824/APX825A -31 VCC Input APX823/APX824/APX825A -40 APX823/APX824/APX825A -44 APX823/APX824/APX825A -46 TS Set-up Time VCC = VTH to (VTH - 100mV) Average WDI=VCC, Time average IIH(AV) High-level Input (dc=88%) Current WDI WDI=0.3V, Average VCC=5.5V time IIL(AV) Low-level Input average Current (dc=12%) High-level Input IIH WDI WDI=VCC Current Low-level Input WDI=0.3V, IIL WDI Current VCC=5.5V ICC WDI and MR Supply Current Unconnected, Outputs unconnected Internal Pull-up Resistor at MR VOUT Temperature Coefficient Input Capacitance at MR , WDI Thermal Resistance Junction-to-Ambient Thermal Resistance Junction-to-Case VI = 0V to 5.5V SOT25 (Note 6) SOT26 (Note 6) SOT25 (Note 6) SOT26 (Note 6) VCC = VTH-+0.2V -
Typ. 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
Max 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
Unit
V
V
50
mV
50 20 120
s A
-15
-
A A A A k ppm/oC pF
o
120 120 30 60 50 5 161 169 27 28
160 160 40 -
TC Ci JA JC
Notes:
C/W C/W
o
4. To ensure best stability of the threshold voltage, a bypass capacitor (ceramic, 0.1F) should be placed near the supply terminals. 5. The RESET short-circuit current is the maximum pull-up current when RESET is driven low by a P bidirectional reset pin. 6. Test condition for SOT25 and SOT26: Devices mounted on FR-4 substrate PC board, 2oz copper, with minimum recommended pad layout.
APX823/APX824/APX825A Rev. 3
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Timing requirements
Symbol Parameter
(at RL=1m, CL=50pF, TA=25oC)
Test Conditions
Min
Typ.
Max
Unit
tW
Pulse Width
at MR at WDI
VCC> VTH-+0.2V, VIL=0.3 x VCC, VIH=0.7x VCC VCC> VTH-+0.2V, VIL=0.3 x VCC, VIH=0.7x VCC
100 50
-
-
ns ns
Switching Characteristics
Symbol Parameter
(at RL=1m, CL=50pF, TA=25oC)
ttout td
tPHL
tPLH
Test Conditions V > VTH-+0.2V, Watchdog Time Out APX823/APX824/APX825A CC See timing diagram VCC> VTH-+0.2V, Delay Time APX823/APX824/APX825A See timing diagram VCC> VTH-+0.2V, Propagation (Delay) MR to RESET VIL=0.3 x VCC, Time, delay (APX823/APX825A) VIH=0.7x VCC High-to-low-level VIL= VTH--0.2V, Output VCC to RESET delay VIH= VTH-+0.2V VCC> VTH-+0.2V, Propagation (Delay) MR to RESET delay VIL=0.3 x VCC, Time, (APX824/APX825A) VIH=0.7x VCC Low-to-high-level VCC to RESET delay VIL= VTH--0.2V, Output (APX824/APX825A) VIH= VTH-+0.2V
Min Typ. Max Unit
1.12 140 -
1.6 200 -
2.4 280 0.1 25 0.1 25
s ms s s s s
APX823/APX824/APX825A Rev. 3
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Application Circuit
VCC
VCC RESET APX8XX MR GND WDI
CIN 100nF
VCC RESET Microprocessor I/O GND
Functional Block Diagram
V CC
Watchdog Timer Logic
Reset Logic
Reset * Reset 60K [
+ 300K [ Vref Transition Detector * APX824/APX825A ** APX823/APX825A
MR **
WDI
APX823/APX824/APX825A Rev. 3
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Timing Diagram
RESET vs Vcc Timing Diagram
Vth
Vcc
Vth
td /RESET
Vth
td
td RESET
td
RESET vs /MR Timing Diagram
Vth
Vcc
/MR td /RESET td
RESET vs WDI Timing Diagram
Vth
Vcc
WDI
td /RESET
tWD
td
tWD
td
APX823/APX824/APX825A Rev. 3
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Typical Characteristics
RESET Timeout Period vs. Temperature
250
RESET Threshold Voltage vs. Temperature
3.2
RESET Timeout Period (mS)
240 230 220 210 200 190 180 170 160 150 -40 -25 0 25 50 85 105 125
RESET Thershold Voltage (V)
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 34
40 35
Supply Curreny vs. Vcc
Vcc Supply Current (uA)
33 32 31 30 29 28 27 26 25 -40 -25 0 25 50 85 105 125
Supply Current (uA)
30 25 20 15 10 5 0 1.5V 2.5V 3.3V 4.0V 5.0V 5.5V
Temperature
Vcc
APX823/APX824/APX825A Rev. 3
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Marking Information
(1) SOT25
( Top View ) 5 4
7
XX Y W X 1
(2) SOT26
2
3
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
( Top View ) 6 5 4
7 7
XX Y W X 1 2 3
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
Marking Table Device Package Type Identification Code
APX823-46W5 APX823-44W5 APX823-40W5 APX823-31W5 APX823-29W5 APX823-26W5 APX823-23W5 APX824-46W5 APX824-44W5 APX824-40W5 APX824-31W5 APX824-29W5 APX824-26W5 APX824-23W5 APX825A-46W6 APX825A-44W6 APX825A-40W6 APX825A-31W6 APX825A-29W6 APX825A-26W6 APX825A-23W6
SOT25 SOT25 SOT25 SOT25 SOT25 SOT25 SOT25 SOT25 SOT25 SOT25 SOT25 SOT25 SOT25 SOT25 SOT26 SOT26 SOT26 SOT26 SOT26 SOT26 SOT26
W1 W2 W3 W4 W5 W6 W7 T2 T3 T4 T5 T6 T7 T8 T9 TA TB TC TD TE TF
APX823/APX824/APX825A Rev. 3
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Package Information
(1) Package Type: SOT25
(All Dimensions in mm)
(2) Package Type: SOT26
Notes:
7. 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
APX823/APX824/APX825A Rev. 3
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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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