Diodes APX823/APX824/APX825A User Manual download pdf

APX823/APX824/APX825A

PROCESSOR SUPERVISORY CIRCUITS

APX823/APX824/APX825A

Document number: DS31323 Rev. 4 - 2

1 of 12

www.diodes.com

May 2011

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

becomes higher than 1.1V. Thereafter, the supply

voltage supervisor monitors V

and keeps

RESET

active as

long as V

remains below the threshold voltage V

TH-

. An

internal timer delays the return of the output to the inactive

state (high) to ensure proper system reset. The delay time, t

starts after V

has risen above the threshold voltage V

TH-

When the supply voltage drops below the threshold voltage

TH-

, the output becomes active (low) again. No external

components are required. All the devices of this family have a

fixed-sense threshold voltage V

TH-

set by an internal voltage

divider.

The APX823/APX825A devices incorporate a manual reset

input,

. A low level at

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 -40

C to 105

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)

Pin Assignments



SOT25

(Top View)

APX8232

3 4

RESET

GND

WDI



(Top View)

APX824

RESET

GND

SOT25

3 4

RESET

WDI



SOT26

(Top View)

APX825A

3 4

RESET

GND

WDI

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.

1 2 3 4 5 6 ... 11 12

Summary of Contents

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Diodes APX823/APX824/APX825A User Manual

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