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TPS3306-15DGK датащи(PDF) 2 Page - Texas Instruments

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номер детали TPS3306-15DGK
подробное описание детали  DUAL PROCESSOR SUPERVISORY CIRCUITS WITH POWER-FAIL
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TPS3306-15DGK датащи(HTML) 2 Page - Texas Instruments

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TPS3306-15
TPS3306-18, TPS3306-20
TPS3306-25, TPS3306-33
SLVS290A – APRIL 2000 – REVISED MAY 2004
The various supervisory circuits are designed to monitor the nominal supply voltage, as shown in the following
supply voltage monitoring table.
SUPPLY VOLTAGE MONITORING
NOMINAL SUPERVISED VOLTAGE
THRESHOLD VOLTAGE (typ)
DEVICE
SENSE1
SENSE2
SENSE1
SENSE2
TPS3306-15
3.3 V
1.5 V
2.93 V
1.4 V
TPS3306-18
3.3 V
1.8 V
2.93 V
1.68 V
TPS3306-20
3.3 V
2 V
2.93 V
1.85 V
TPS3306-25
3.3 V
2.5 V
2.93 V
2.25 V
TPS3306-33
5 V
3.3 V
4.55 V
2.93 V
During power-on, RESET is asserted when the supply voltage VDD becomes higher than 1.1 V. Thereafter, the
supervisory circuits monitor the SENSEn inputs and keep RESET active as long as SENSEn remains below the
threshold voltage VIT.
An internal timer delays the return of the RESET output to the inactive state (high) to ensure proper system
reset. The delay time, td(typ) = 100 ms, starts after SENSE1 and SENSE2 inputs have risen above the threshold
voltage VIT. When the voltage at SENSE1 or SENSE2 input drops below the threshold voltage VIT, the output
becomes active (low) again.
The integrated power-fail (PFI) comparator with separate open-drain (PFO) output can be used for low-battery
detection, power-fail warning, or for monitoring a power supply other than the main supply.
The TPS3306-xx devices integrate a watchdog timer that is periodically triggered by a positive or negative
transition of WDI. When the supervising system fails to retrigger the watchdog circuit within the time-out interval,
tt(out) = 0.50 s, RESET becomes active for the time period td. This event also reinitializes the watchdog timer.
Leaving WDI unconnected disables the watchdog.
The TPS3306-xx devices are available in either 8-pin MSOP or standard 8-pin SO packages, and are
characterized for operation over a temperature range of -40
°C to 85°C.
AVAILABLE OPTIONS
PACKAGED DEVICES
MARKING
TA
DGK PACKAGE
SMALL OUTLINE (D)
µ-SMALL OUTLINE (DGK)
TPS3306-15D
TPS3306-15DGK
TIAIC
TPS3306-18D
TPS3306-18DGK
TIAID
-40
°C to 85°C
TPS3306-20D
TPS3306-20DGK
TIAIE
TPS3306-25D
TPS3306-25DGK
TIAIF
TPS3306-33D
TPS3306-33DGK
TIAIG
2


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