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PDF APX823 Data sheet ( Hoja de datos )
| Número de pieza | APX823 | |
| Descripción | PROCESSOR SUPERVISORY CIRCUITS | |
| Fabricantes | Diodes | |
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APX823/APX824/APX825A
PROCESSOR SUPERVISORY CIRCUITS
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/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.
Pin Assignments
(Top View)
RESET 1
GND 2
APX823
5 VCC
MR 3
4 WDI
SOT25
(Top View)
RESET 1
5 VCC
GND 2 APX824
RESET 3
4 WDI
SOT25
(Top View)
RESET 1
GND 2
APX825A
6 VCC
5 WDI
RESET 3
4 MR
SOT26
Features
Applications
• 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
• Applications Using DSPs, Microcontrollers, or
Microprocessors
• Industrial Equipment
• Programmable Controls
• Automotive Systems
• Portable/Battery-Powered Equipment
• Intelligent Instruments
• Wireless Communications Systems
• Notebook/Desktop Computers
• SOT25 and SOT26: Available in “Green” Molding
Compound (No Br, Sb)
• Lead Free Finish/RoHS Compliant (Note 1)
Note:
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied, see EU Directive 2002/95/EC Annex Notes.
APX823/APX824/APX825A
Document number: DS31323 Rev. 4 - 2
1 of 12
www.diodes.com
May 2011
© Diodes Incorporated
1 page  
APX823/APX824/APX825A
PROCESSOR SUPERVISORY CIRCUITS
Electrical Characteristics (cont.)
Symbol
Parameter
Test Conditions Min Typ. Max
APX823/APX824/APX825A -23
APX823/APX824/APX825A -26
APX823/APX824/APX825A -29
Vhys
Hysteresis at VCC
Input
APX823/APX824/APX825A -31
APX823/APX824/APX825A -40
- 50 -
APX823/APX824/APX825A -44
- 50 -
APX823/APX824/APX825A -46
TS Set-up Time
VCC = VTH to (VTH – 100mV)
20
IIH(AV)
IIL(AV)
Average High-
level Input
Current
Average Low-
level Input
Current
WDI
WDI=VCC,
Time average
- 120 -
(dc=88%)
WDI=0.3V,
VCC=5.5V time
- -15 -
average (dc=12%)
High-level Input
IIH Current
WDI
WDI=VCC
- 120 160
IIL
Low-level Input WDI
Current
WDI=0.3V,
VCC=5.5V
- 120 160
Unit
mV
μs
μA
μA
μA
μA
WDI and MR
ICC Supply Current Unconnected, Outputs
unconnected
Internal Pull-up Resistor at MR
TC VOUT Temperature Coefficient
VCC = VTH-+0.2V - 30 40
μA
- 60 -
kΩ
50 - ppm/oC
Ci Input Capacitance at MR , WDI
θJA Thermal Resistance Junction-to-Ambient
θJC Thermal Resistance Junction-to-Case
VI = 0V to 5.5V
SOT25 (Note 4)
SOT26 (Note 4)
SOT25 (Note 4)
SOT26 (Note 4)
-5 -
161
169
27
28
pF
oC/W
oC/W
Note:
4. Test condition for SOT25 and SOT26: Devices mounted on FR-4 substrate PC board, 2oz copper, with minimum recommended pad layout.
APX823/APX824/APX825A
Document number: DS31323 Rev. 4 - 2
5 of 12
www.diodes.com
May 2011
© Diodes Incorporated
5 Page 
APX823/APX824/APX825A
PROCESSOR SUPERVISORY CIRCUITS
Package Outline Dimensions (cont.) (All Dimensions in mm)
(2) Package Type: SOT26
Notes:
6. 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
Document number: DS31323 Rev. 4 - 2
11 of 12
www.diodes.com
May 2011
© Diodes Incorporated
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet APX823.PDF ] | |
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