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TPS3306-15DGK Fiches technique(PDF) 4 Page - Texas Instruments

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No de pièce TPS3306-15DGK
Description  DUAL PROCESSOR SUPERVISORY CIRCUITS WITH POWER-FAIL
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

TPS3306-15DGK Fiches technique(HTML) 4 Page - Texas Instruments

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RESET Because of
Power-Down
RESET Because of WDI
RESET Because of a Power Drop Below VIT–
RESET Because of Power-Up
tt(out)
SENSEn
V(nom)
VIT
1.1 V
WDI
1
0
RESET
1
0
Undefined
Behavior
Undefined
Behavior
DETAILED DESCRIPTION
Watchdog
TPS3306-15
TPS3306-18, TPS3306-20
TPS3306-25, TPS3306-33
SLVS290A – APRIL 2000 – REVISED MAY 2004
TIMING DIAGRAM
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME
NO.
GND
4
I
Ground
PFI
3
I
Power-fail comparator input
PFO
6
O
Power-fail comparator output, open-drain
RESET
5
O
Active-low reset output, open-drain
SENSE1
1
I
Sense voltage input 1
SENSE2
2
I
Sense voltage input 2
WDI
7
I
Watchdog timer input
VDD
8
I
Supply voltage
In a microprocessor- or DSP-based system, it is not only important to supervise the supply voltage, it is also
important to ensure correct program execution. The task of a watchdog is to ensure that the program is not
stalled in an indefinite loop. The microprocessor, microcontroller, or DSP has to typically toggle the watchdog
input within 0.8 s to avoid a time out occurring. Either a low-to-high or a high-to-low transition resets the internal
watchdog timer. If the input is unconnected or tied with a high impedance driver, the watchdog is disabled and
will be retriggered internally.
4


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