SLVS165J – APRIL 1998 – REVISED APRIL 2013
Processor Supervisory Circuits
Check for Samples:
1
FEATURES
•
Power-On Reset Generator With Fixed 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 (TPS3824/5) 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
TPS3820, TPS3823, TPS3828: DBV PACKAGE
TPS3820A, TPS3823A, TPS3828A: DBV PACKAGE
(TOP VIEW)
RESET
2
•
•
1
2
3
5
V
DD
GND
MR
4
•
•
•
•
•
WDI
TPS3824 and TPS3824A: DBV PACKAGE
(TOP VIEW)
RESET
1
2
3
5
V
DD
GND
RESET
APPLICATIONS
•
•
•
•
•
•
•
•
Applications Using DSPs, Microcontrollers, or
Microprocessors
Industrial Equipment
Programmable Controls
Automotive Systems
Portable/Battery-Powered Equipment
Intelligent Instruments
Wireless Communications Systems
Notebook/Desktop Computers
4
WDI
TPS3825 and TPS3825A: DBV PACKAGE
(TOP VIEW)
RESET
1
2
3
5
V
DD
GND
RESET
4
MR
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 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.
1
V
DD
RESET
100 nF
RESET
V
DD
TPS3823-33
MR
MSP430C325
I/O
GND
WDI
GND
2
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Copyright © 1998–2013, Texas Instruments Incorporated
UNLESS OTHERWISE NOTED this document contains
PRODUCTION DATA information current as of publication date.
Products conform to specifications per the terms of Texas
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necessarily include testing of all parameters.
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