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TPS3823-25DBVT Fiches technique(PDF) 2 Page - Texas Instruments

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No de pièce TPS3823-25DBVT
Description  PROCESSOR SUPERVISORY CIRCUITS
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

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TPS382x-xx,
TPS382xA-xx
SLVS165H − APRIL 1998 − REVISED JULY 2012
www.ti.com
2
DESCRIPTION (Continued)
The TPS3820/3/5/8 devices incorporate a manual reset input, MR. A low level at MR causes RESET to become active.
The TPS3824/5 devices include a high-level output RESET. TPS3820/3/4/8 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 TPS3820/3/4/8 is asserting RESET, the TPS3820/3/4/8 does not return to a non-reset
state when the input voltage is above VT.
If the application requires that the WDI input is active when the RESET pin is asserted, then use the ”A” version of the device.
The ”A” version does not latch the RESET pin to the asserted state if a WDI pulse is received while the RESET pin is
asserted.
Figure 1 shows how to decouple WDI from the active signal using when using the non−”A” version. This is accomplished
with an N−Channel FET in series with the WDI pin, with the gate of the FET connected to the RESET output. The “A” version
of the device does not need this FET but will operate in circuits that have it. Therefore, the “A” version is backward
compatible with the non’”A” versions.
WDI
RESET
TPS3824
WDI External
Figure 1
The product spectrum is designed for supply voltages of 2.5 V, 3 V, 3.3 V, and 5 V. The circuits are available in an SOT23-5
package. The TPS382x devices are characterized for operation over a temperature range of −40°C to +85°C.
PACKAGE INFORMATION(1)
DEVICE NAME
DEVICE NAME
THRESHOLD VOLTAGE(2)
MARKING
TPS3820-33DBVT(3)
TPS3820-33DBVR(4)
2.93 V
PDEI
TPS3820-50DBVT(3)
TPS3820-50DBVR(4)
4.55 V
PDDI
TPS3823-25DBVT(3)
TPS3823-25DBVR(4)
2.25 V
PAPI
TPS3823-30DBVT(3)
TPS3823-30DBVR(4)
2.63 V
PAQI
TPS3823-33DBVT(3)
TPS3823-33DBVR(4)
2.93 V
PARI
TPS3823-50DBVT(3)
TPS3823-50DBVR(4)
4.55 V
PASI
TPS3824-25DBVT(3)
TPS3824-25DBVR(4)
2.25 V
PATI
TPS3824-30DBVT(3)
TPS3824-30DBVR(4)
2.63 V
PAUI
TPS3824-33DBVT(3)
TPS3824-33DBVR(4)
2.93 V
PAVI
TPS3824-50DBVT(3)
TPS3824-50DBVR(4)
4.55 V
PAWI
TPS3825-33DBVT(3)
TPS3825-33DBVR(4)
2.93 V
PDGI
TPS3825-50DBVT(3)
TPS3825-50DBVR(4)
4.55 V
PDFI
TPS3828-33DBVT(3)
TPS3828-33DBVR(4)
2.93 V
PDII
TPS3828-50DBVT(3)
TPS3828-50DBVR(4)
4.55 V
PDHI
(1) For the most current package and ordering information see the Package Option Addendum at
the end of this document, or see the TI web site at www.ti.com.
(2) For other threshold voltage versions, please contact the local TI sales office.
(3) The DBVT package indicates tape and reel of 250 parts.
(4) The DBVR package indicates tape and reel of 3000 parts.


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