TPS3820 xx, TPS3823 xx,
TPS3824 xx, TPS3825 xx,
TPS3828 xx
SLVS165G − APRIL 1998 − REVISED JANUARY 2008
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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, t
tout
, RESET becomes active for the time period t
d
. 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 V
T
. If the application requires that input to WDI is active when RESET is asserted,
WDI must be decoupled from the active signal. This decoupling can be accomplished by using an N-channel FET in series
with the WDI pin, with the gate of the FET connected to the RESET output as shown in Figure 1.
TPS3824
WDI
WDI External
RESET
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
TPS3820-33DBVT
(3)
TPS3820-50DBVT
(3)
TPS3823-25DBVT
(3)
TPS3823-30DBVT
(3)
TPS3823-33DBVT
(3)
TPS3823-50DBVT
(3)
TPS3824-25DBVT
(3)
TPS3824-30DBVT
(3)
TPS3824-33DBVT
(3)
TPS3824-50DBVT
(3)
TPS3825-33DBVT
(3)
TPS3825-50DBVT
(3)
TPS3828-33DBVT
(3)
DEVICE NAME
TPS3820-33DBVR
(4)
TPS3820-50DBVR
(4)
TPS3823-25DBVR
(4)
TPS3823-30DBVR
(4)
TPS3823-33DBVR
(4)
TPS3823-50DBVR
(4)
TPS3824-25DBVR
(4)
TPS3824-30DBVR
(4)
TPS3824-33DBVR
(4)
TPS3824-50DBVR
(4)
TPS3825-33DBVR
(4)
TPS3825-50DBVR
(4)
TPS3828-33DBVR
(4)
THRESHOLD VOLTAGE
(2)
2.93 V
4.55 V
2.25 V
2.63 V
2.93 V
4.55 V
2.25 V
2.63 V
2.93 V
4.55 V
2.93 V
4.55 V
2.93 V
MARKING
PDEI
PDDI
PAPI
PAQI
PARI
PASI
PATI
PAUI
PAVI
PAWI
PDGI
PDFI
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.
2
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