TPS3820- Datasheet, PDF (1/14 Pages) Texas Instruments – PROCESSOR SUPERVISORY CIRCUITS

TPS3820Ćxx, TPS3823Ćxx, TPS3824Ćxx, TPS3825Ćxx, TPS3828Ćxx
PROCESSOR SUPERVISORY CIRCUITS
ą
SLVS165E – APRIL 1998 – REVISED DECEMBER 2002
features
D Power-On Reset Generator With Fixed
Delay Time of 200 ms (TPS3823/4/5/8)
or 25 ms (TPS3820)
D Manual Reset Input (TPS3820/3/5/8)
D Reset Output Available in Active-Low
(TPS3820/3/4/5), Active-High (TPS3824) and
Open-Drain (TPS3828)
D Supply Voltage Supervision Range
2.5 V, 3 V, 3.3 V, 5 V
D Watchdog Timer (TPS3820/3/4/8)
D Supply Current of 15 µA (Typ)
D SOT23-5 Package
D Temperature Range . . . –40°C to 85°C
TPS3820, TPS3823, TPS3828 . . . DBV PACKAGE
(TOP VIEW)
RESET
1
5
VDD
GND
2
MR
3
4
WDI
TPS3824 . . . DBV PACKAGE
(TOP VIEW)
RESET
1
5
VDD
GND
2
RESET
3
4
WDI
applications
D Applications Using DSPs, Microcontrollers,
or Microprocessors
TPS3825 . . . DBV PACKAGE
(TOP VIEW)
RESET
1
5
VDD
D Industrial Equipment
D Programmable Controls
GND
2
D Automotive Systems
RESET
3
4
MR
D Portable/Battery-Powered Equipment
D Intelligent Instruments
typical application
D Wireless Communications Systems
3.3 V
D Notebook/Desktop Computers
description
VDD
100 nF
VDD
The TPS382x family of supervisors provides
circuit initialization and timing supervision,
primarily for DSP and processor-based systems.
RESET
TPS3823-33
MR WDI
RESET
MSP430C325
I/O
During power-on, RESET is asserted when
supply voltage V_DD becomes higher than 1.1 V.
GND
GND
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
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