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TPS3820-xx, TPS3823-xx,
TPS3824-xx, TPS3825-xx,
TPS3828-xx
SLVS165G − APRIL 1998 − REVISED JANUARY 2008
PROCESSOR SUPERVISORY
CIRCUITS
FEATURES
D
Power-On Reset Generator With Fixed Delay
D
D
D
D
D
D
D
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 (TPS3824/5) 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
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.
TPS3820, TPS3823, TPS3828: DBV PACKAGE
(TOP VIEW)
RESET
GND
MR
1
2
3
4
WDI
5
VDD
TPS3824: DBV PACKAGE
(TOP VIEW)
RESET
GND
RESET
1
2
3
4
WDI
5
VDD
APPLICATIONS
D
Applications Using DSPs, Microcontrollers, or
D
D
D
D
D
D
D
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 provide circuit
initialization and timing supervision, primarily for DSP
and processor-based systems. During power-on,
RESET asserts when the supply voltage V
DD
becomes
higher than 1.1 V. Thereafter, the supply voltage
supervisor monitors 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
VDD
RESET
TPS3823-33
MR
WDI
GND
I/O
100 nF
RESET
VDD
MSP430C325
GND
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PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
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2001−2007, Texas Instruments Incorporated
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