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APX825A Datasheet

PROCESSOR SUPERVISORY CIRCUITS

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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


Diodes Semiconductor Electronic Components Datasheet

APX825A Datasheet

PROCESSOR SUPERVISORY CIRCUITS

No Preview Available !

Typical Application Circuit
VCC
RESET
APX8XX
MR WDI
GND
APX823/APX824/APX825A
PROCESSOR SUPERVISORY CIRCUITS
CIN
100nF
VCC
VCC
RESET
Microprocessor
I/O
GND
Pin Descriptions
Pin Name
GND
RESET
(RESET)
VCC
WDI
MR
Description
Ground
Reset output pin
Operating voltage input
Watchdog input
Manual reset
Functional Block Diagram
APX823/APX824/APX825A
Document number: DS31323 Rev. 4 - 2
2 of 12
www.diodes.com
May 2011
© Diodes Incorporated


Part Number APX825A
Description PROCESSOR SUPERVISORY CIRCUITS
Maker Diodes
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