TPS3820 xx, TPS3823 xx, TPS3824 xx, TPS3825 xx, TPS3828 xx
PROCESSOR SUPERVISORY CIRCUITS
SLVS165E – APRIL 1998 – REVISED DECEMBER 2002
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 Vt. If the application requires that input to WDI is active when RESET is asserted, WDI must
be decoupled from the active signal. This 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 a 5-pin SOT23-5 package. The TPS382x devices are characterized for operation over a temperature range
of -40°C to 85°C.
PACKAGE INFORMATION
DEVICE NAME
TPS3820-33DBVT†
TPS3820-50DBVT†
TPS3823-25DBVT†
TPS3823-30DBVT†
TPS3823-33DBVT†
TPS3823-50DBVT†
TPS3824-25DBVT†
TPS3824-30DBVT†
TPS3824-33DBVT†
TPS3824-50DBVT†
TPS3825-33DBVT†
TPS3825-50DBVT†
TPS3828-33DBVT†
TPS3828-50DBVT†
DEVICE NAME
TPS3820-33DBVR‡
TPS3820-50DBVR‡
TPS3823-25DBVR‡
TPS3823-30DBVR‡
TPS3823-33DBVR‡
TPS3823-50DBVR‡
TPS3824-25DBVR‡
TPS3824-30DBVR‡
TPS3824-33DBVR‡
TPS3824-50DBVR‡
TPS3825-33DBVR‡
TPS3825-50DBVR‡
TPS3828-33DBVR‡
TPS3828-50DBVR‡
THRESHOLD VOLTAGE
§
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
4.55 V
MARKING
PDEI
PDDI
PAPI
PAQI
PARI
PASI
PATI
PAUI
PAVI
PAWI
PDGI
PDFI
PDII
PDHI
† The DBVT package indicates tape and reel of 250 parts.
‡ The DBVR package indicates tape and reel of 3000 parts.
§ For other threshold voltage versions, please contact the local TI sales office.
2
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
TI [ TEXAS INSTRUMENTS ]
