TPS3820 xx, TPS3823 xx, TPS3824 xx, TPS3825 xx, TPS3828 xx
PROCESSOR SUPERVISORY CIRCUITS
SLVS165E – APRIL 1998 – REVISED DECEMBER 2002
features
TPS3820, TPS3823, TPS3828 . . . DBV PACKAGE
(TOP VIEW)
RESET
GND
MR
1
2
3
4
WDI
5
VDD
D
Power-On Reset Generator With Fixed
D
D
D
D
D
D
D
Delay Time of 200 ms (TPS3823/4/5/8)
or 25 ms (TPS3820)
Manual Reset Input (TPS3820/3/5/8)
Reset Output Available in Active-Low
(TPS3820/3/4/5), Active-High (TPS3824) and
Open-Drain (TPS3828)
Supply Voltage Supervision Range
2.5 V, 3 V, 3.3 V, 5 V
Watchdog Timer (TPS3820/3/4/8)
Supply Current of 15
µA
(Typ)
SOT23-5 Package
Temperature Range . . . –40°C to 85°C
TPS3824 . . . DBV PACKAGE
(TOP VIEW)
RESET
GND
RESET
1
2
3
4
WDI
5
VDD
applications
D
Applications Using DSPs, Microcontrollers,
D
D
D
D
D
D
D
or Microprocessors
Industrial Equipment
Programmable Controls
Automotive Systems
Portable/Battery-Powered Equipment
Intelligent Instruments
Wireless Communications Systems
Notebook/Desktop Computers
TPS3825 . . . DBV PACKAGE
(TOP VIEW)
RESET
GND
RESET
1
2
3
4
MR
5
VDD
typical application
3.3 V
description
The TPS382x family of supervisors provides
circuit initialization and timing supervision,
primarily for DSP and processor-based systems.
VDD
RESET
TPS3823-33
MR
WDI
100 nF
RESET
VDD
MSP430C325
I/O
During power-on, RESET is asserted when
GND
GND
supply voltage V
DD
becomes higher than 1.1 V.
Thereafter, the supply voltage supervisor moni-
tors V
DD
and keeps RESET active as long as V
DD
remains below the threshold voltage V
IT–
.
An internal timer delays the return of the output to the inactive state (high) to ensure proper system reset. The
delay time, t
d
, starts after V
DD
has risen above the threshold voltage V
IT–
. When the supply voltage drops below
the threshold voltage V
IT–
, the output becomes active (low) again. No external components are required. All
the devices of this family have a fixed-sense threshold voltage V
IT–
set by an internal voltage divider.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
This document contains information on products in more than one phase
of development. The status of each device is indicated on the page(s)
specifying its electrical characteristics.
Copyright
2002, Texas Instruments Incorporated
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
1
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