Diodes APX823-23W5, APX823-26W5, APX823-29W5, APX823-31W5, APX823-40W5 Schematic [ru]
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APX823/APX824/APX825A
PROCESSOR SUPERVISORY CIRCUITS
Description |
Pin Assignments |
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/APX8
25A 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 packages. The APX823/APX824/APX825A devices are characterized for operation over a temperature range of -40oC to 105oC.
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(Top View) |
RESET 1 |
5 VCC |
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GND |
2 |
APX823 |
MR |
3 |
4 WDI |
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SOT25 |
RESET |
1 |
GND |
2 |
RESET 3 |
(Top View)
5 VCC |
APX824
4 WDI |
SOT25
RESET 1
GND 2 |
RESET 3 |
(Top View) |
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6 |
VCC |
APX825A |
5 |
WDI |
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4 |
MR |
SOT26 |
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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 30μA (Typ.)
•Temperature range: -40°C to 85°C
•SOT25 and SOT26: Available in “Green” Molding Compound (No Br, Sb)
•Lead Free Finish/RoHS Compliant (Note 1)
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
Note: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied, see EU Directive 2002/95/EC Annex Notes.
APX823/APX824/APX825A |
1 of 12 |
May 2011 |
Document number: DS31323 Rev. 4 - 2 |
www.diodes.com |
© Diodes Incorporated |
APX823/APX824/APX825A
PROCESSOR SUPERVISORY CIRCUITS
Typical Application Circuit
VCC
CIN
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VCC |
100nF |
VCC |
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RESET |
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RESET |
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APX8XX |
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Microprocessor |
MR |
WDI |
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I/O |
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GND |
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GND |
Pin Descriptions
Pin Name |
Description |
GND |
Ground |
RESET |
Reset output pin |
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(RESET) |
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VCC |
Operating voltage input |
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WDI |
Watchdog input |
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Manual reset |
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MR |
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Functional Block Diagram
APX823/APX824/APX825A |
2 of 12 |
May 2011 |
Document number: DS31323 Rev. 4 - 2 |
www.diodes.com |
© Diodes Incorporated |
APX823/APX824/APX825A
PROCESSOR SUPERVISORY CIRCUITS
Absolute Maximum Ratings (Over operating ambient temperature range, unless otherwise noted)*
Symbol |
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Parameter |
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Rating |
Unit |
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ESD HBM |
Human Body Model ESD Protection |
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5 |
KV |
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ESD MM |
Machine Model ESD Protection |
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200 |
V |
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VCC |
Supply Voltage |
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6.0 |
V |
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VRESET |
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-0.3 to (VCC+0.3) |
V |
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RESET, |
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, MR , WDI |
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RESET |
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ICC |
Input Current VCC |
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20 |
mA |
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IO |
Maximum High Output Current |
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20 |
mA |
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Derating Factor Above |
SOT25 |
6.2 |
mW/°C |
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TA = 25oC |
SOT26 |
5.8 |
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TA |
= 25oC Power Rating |
SOT25 |
500 |
mW |
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PD |
Continuous Total Power |
SOT26 |
470 |
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Dissipation |
TA |
= 70oC Power Rating |
SOT25 |
220 |
mW |
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SOT26 |
210 |
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TA |
= 85oC Power Rating |
SOT25 |
125 |
mW |
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SOT26 |
120 |
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TOP |
Operating Junction Temperature Range |
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-40 to 105 |
°C |
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TST |
Storage Temperature Range |
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-65 to 150 |
°C |
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*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.
Recommended Operating Conditions
Symbol |
Parameter |
Min |
Max |
Unit |
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VCC |
Supply Voltage |
1.1 |
5.5 |
V |
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VIN |
Input Voltage |
0 |
(VCC+0.3) |
V |
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VIH |
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0.7 ×VCC |
- |
V |
High-level Input Voltage at MR and WDI |
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VIL |
Low-level Voltage |
- |
0.3 ×VCC |
V |
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t/ V |
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- |
100 |
ns/V |
Input Transition Rise and Fall Rate at MR or WDI |
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TA |
Operating Ambient Temperature Range |
-40 |
85 |
oC |
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TR |
VCC Rising Time (VCC = 0~VT) |
- |
100 |
V/ uS |
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APX823/APX824/APX825A |
3 of 12 |
May 2011 |
Document number: DS31323 Rev. 4 - 2 |
www.diodes.com |
© Diodes Incorporated |
APX823/APX824/APX825A
PROCESSOR SUPERVISORY CIRCUITS
Electrical Characteristics (Over recommended operating ambient temperature range, unless otherwise noted)
Symbol |
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Parameter |
Test Conditions |
Min |
Typ. |
Max |
Unit |
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APX823/APX824/APX825A - |
VCC= VTH-+0.2V |
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29/26/23 |
IOH=-20μA |
0.8×VCC |
- |
- |
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V |
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APX823/APX824/APX825A - |
VCC= VTH-+0.2V |
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RESET |
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40/31 |
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IOH=-30μA |
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VOH |
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High-level |
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APX823/APX824/APX825A |
VCC= VTH-+0.2V |
VCC-1.5V |
- |
- |
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V |
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Output Voltage |
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–46/44 |
IOH=-120μA |
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APX824/APX825A |
VCC > 1.8V, |
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RESET |
-29/26/23 |
IOH = -100μA |
0.8×VCC |
- |
- |
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V |
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APX824/APX825A - |
VCC > 1.8V, |
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46/44/40/31 |
IOH = -150μA |
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APX824/APX825A |
VCC= VTH-+0.2V |
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-29/26/23 |
IOL=1mA |
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RESET |
APX824/APX825A -40/31 |
VCC= |
V |
TH-+0.2V |
- |
- |
0.4 |
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V |
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IOL=1.2mA |
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APX824/APX825A -46/44 |
VCC= VTH-+0.2V |
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Low-level |
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IOL=3mA |
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VOL |
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Output Voltage |
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APX823/APX824/APX825A - |
VCC= VTH--0.2V |
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29/26/23 |
IOL=1mA |
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APX823/APX824/APX825A - |
VCC= VTH--0.2V |
- |
- |
0.4 |
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V |
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RESET |
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40/31 |
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IOL=1.2mA |
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APX823/APX824/APX825A - |
VCC= VTH--0.2V |
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46/44 |
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IOL=3mA |
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VRESET |
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Power-up Reset Voltage (see Note 2) |
VCC > 1.1V, |
- |
- |
0.4 |
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V |
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IOL=20μA |
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APX823/APX824/APX825A -23 |
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2.21 |
2.25 |
2.30 |
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APX823/APX824/APX825A -26 |
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2.59 |
2.63 |
2.69 |
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APX823/APX824/APX825A -29 |
TA = 0oC -85oC |
2.88 |
2.93 |
3.00 |
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APX823/APX824/APX825A -31 |
3.02 |
3.08 |
3.15 |
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V |
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APX823/APX824/APX825A -40 |
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3.93 |
4.00 |
4.08 |
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Negative-going |
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APX823/APX824/APX825A -44 |
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4.31 |
4.38 |
4.47 |
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VTH- |
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Input Threshold |
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APX823/APX824/APX825A -46 |
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4.56 |
4.63 |
4.72 |
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Voltage |
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APX823/APX824/APX825A -23 |
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2.20 |
2.25 |
2.30 |
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(see Note 3) |
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APX823/APX824/APX825A -26 |
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2.57 |
2.63 |
2.69 |
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APX823/APX824/APX825A -29 |
TA= -40oC -85oC |
2.86 |
2.93 |
3.00 |
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APX823/APX824/APX825A -31 |
3.00 |
3.08 |
3.15 |
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V |
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APX823/APX824/APX825A -40 |
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3.92 |
4.00 |
4.08 |
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APX823/APX824/APX825A -44 |
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4.29 |
4.38 |
4.47 |
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APX823/APX824/APX825A -46 |
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4.54 |
4.63 |
4.72 |
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Note: |
2. The lowest supply voltage at which RESET becomes active. TR , VCC > 15μs/V. |
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3. To ensure best stability of the threshold voltage, a bypass capacitor (ceramic, 0.1μF) should be placed near the supply terminals. |
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APX823/APX824/APX825A |
4 of 12 |
May 2011 |
Document number: DS31323 Rev. 4 - 2 |
www.diodes.com |
© Diodes Incorporated |
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