TPS3820-33DBVR Datasheet, PDF (1/20 Pages) Texas Instruments – Processor Supervisory Circuits

TPS382x-xx
TPS382xA-xx
www.ti.com
SLVS165J – APRIL 1998 – REVISED APRIL 2013
Processor Supervisory Circuits
Check for Samples: TPS382x-xx, TPS382xA-xx
FEATURES
1
•2 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
1
5
V_DD
GND
2
MR
3
4
WDI
TPS3824 and TPS3824A: DBV PACKAGE
(TOP VIEW)
RESET
1
5
V_DD
GND
2
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
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.
RESET
3
4
WDI
TPS3825 and TPS3825A: DBV PACKAGE
(TOP VIEW)
RESET
1
5
V_DD
GND
2
RESET
3
4
MR
TYPICAL APPLICATION
3.3 V
V_DD
RESET
TPS3823-33
MR
WDI
GND
100 nF
V_DD
RESET
MSP430C325
I/O
GND
1
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2
UNLESS OTHERWISE NOTED this document contains
PRODUCTION DATA information 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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