TPS3820-XX_08 Datasheet, PDF (1/17 Pages) Texas Instruments – PROCESSOR SUPERVISORY CIRCUITS

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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
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 (TPS3824/5) 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
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
1
5
VDD
GND
2
MR
3
4
WDI
TPS3824: DBV PACKAGE
(TOP VIEW)
RESET
1
5
VDD
APPLICATIONS
D Applications Using DSPs, Microcontrollers, or
Microprocessors
D Industrial Equipment
D Programmable Controls
D Automotive Systems
D Portable/Battery-Powered Equipment
D Intelligent Instruments
D Wireless Communications Systems
D Notebook/Desktop Computers
DESCRIPTION
GND
2
RESET
3
4
WDI
TPS3825: DBV PACKAGE
(TOP VIEW)
RESET
1
5
VDD
GND
2
RESET
3
4
MR
TYPICAL APPLICATION
3.3 V
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
100 nF
VDD
RESET
MSP430C325
I/O
GND
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PRODUCTION DATA information is current as of publication date. Products
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Production processing does not necessarily include testing of all parameters.
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