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SLVS165E – APRIL 1998 – REVISED DECEMBER 2002
TPS3820, TPS3823, TPS3828 . . . DBV PACKAGE
(TOP VIEW)
features
D
Power-On Reset Generator With Fixed
Delay Time of 200 ms (TPS3823/4/5/8)
or 25 ms (TPS3820)
1
2
3
5
V
DD
RESET
GND
D
D
Manual Reset Input (TPS3820/3/5/8)
Reset Output Available in Active-Low
(TPS3820/3/4/5), Active-High (TPS3824) and
Open-Drain (TPS3828)
4
WDI
MR
TPS3824 . . . DBV PACKAGE
(TOP VIEW)
D
Supply Voltage Supervision Range
2.5 V, 3 V, 3.3 V, 5 V
1
2
3
5
V
DD
RESET
GND
D
D
D
D
Watchdog Timer (TPS3820/3/4/8)
Supply Current of 15 µA (Typ)
SOT23-5 Package
4
WDI
RESET
Temperature Range . . . –40°C to 85°C
TPS3825 . . . DBV PACKAGE
(TOP VIEW)
applications
D
Applications Using DSPs, Microcontrollers,
or Microprocessors
1
2
3
5
V
DD
RESET
GND
D
D
D
D
D
D
D
Industrial Equipment
Programmable Controls
4
MR
RESET
Automotive Systems
Portable/Battery-Powered Equipment
Intelligent Instruments
typical application
3.3 V
Wireless Communications Systems
Notebook/Desktop Computers
100 nF
V
V
DD
DD
description
RESET
RESET
The TPS382x family of supervisors provides
TPS3823-33
MR WDI
MSP430C325
GND
circuit initialization and timing supervision,
primarily for DSP and processor-based systems.
I/O
During power-on, RESET is asserted when
GND
supply voltage V
becomes higher than 1.1 V.
DD
Thereafter, the supply voltage supervisor moni-
tors V and keeps RESET active as long as V
DD
DD
IT–
remains below the threshold voltage V
.
An internal timer delays the return of the output to the inactive state (high) to ensure proper system reset. The
delay time, t , starts after V has risen above the threshold voltage V . When the supply voltage drops below
d
DD
IT–
the threshold voltage V , the output becomes active (low) again. No external components are required. All
IT–
the devices of this family have a fixed-sense threshold voltage V
set by an internal voltage divider.
IT–
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.
Copyright 2002, Texas Instruments Incorporated
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