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TPS3305 датащи(PDF) 2 Page - Texas Instruments

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номер детали TPS3305
подробное описание детали  DUAL PROCESSOR SUPERVISORS
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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TPS3305-18, TPS3305-25, TPS3305-33
DUAL PROCESSOR SUPERVISORS
SLVS198 – DECEMBER 1998
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description (continued)
The various supply voltage supervisors are designed to monitor the nominal supply voltage, as shown in the
following supply voltage monitoring table.
SUPPLY VOLTAGE MONITORING
DEVICE
NOMINAL SUPERVISED VOLTAGE
THRESHOLD VOLTAGE (TYP)
DEVICE
SENSE1
SENSE2
SENSE1
SENSE2
TPS3305-18
3.3 V
1.8 V
2.93 V
1.68 V
TPS3305-25
3.3 V
2.5 V
2.93 V
2.25 V
TPS3305-33
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
supply voltage supervisor monitors the SENSEn inputs and keeps 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 = 200 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 RESET output
becomes active (low) again.
The TPS3305-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) = 1.6 s, RESET becomes active for the time period td . This event also reinitializes the watchdog timer.
Leaving WDI unconnected disables the watchdog.
The TPS3305-xx family of devices incorporates a manual reset input, MR. A low level at MR causes RESET
to become active. In addition to the active-low RESET output, the TPS3305-xx family includes an active-high
RESET output.
The TPS3305-xx devices are available in either 8-pin MSOP or standard 8-pin SO packages.
The TPS3305-xx family is characterized for operation over a temperature range of – 40
°C to 85°C.
AVAILABLE OPTIONS
PACKAGED DEVICES
TA
SMALL OUTLINE
(D)
PowerPAD
µ-SMALL OUTLINE
(DGN)
MARKING
DGN PACKAGE
CHIP FORM
(Y)
TPS3305-18D
TPS3305-18DGN
TIAAM
TPS3305-18Y
–40
_C to 85_C
TPS3305-25D
TPS3305-25DGN
TIAAN
TPS3305-25Y
TPS3305-33D
TPS3305-33DGN
TIAAO
TPS3305-33Y
PowerPAD is a trademark of Texas Instruments Incorporated.


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