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TPS3813J25DBV Datasheet

  • TPS3813J25DBV

  • PROCESSOR SUPERVISORY CIRCUITS WITH WINDOW-WATCHDOG

  • 12頁

  • TI

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TPS3813J25, TPS3813L30, TPS3813K33, TPS3813I50
PROCESSOR SUPERVISORY CIRCUITS WITH WINDOW-WATCHDOG
SLVS331A 鈥?DECEMBER 2000 鈥?REVISED APRIL 2001
features
typical applications
D
D
D
D
D
D
D
Window-Watchdog With Programmable
Delay and Window Ratio
6-Pin SOT-23 Package
Supply Current of 9
碌A(chǔ)
(Typ)
Power On Reset Generator With a Fixed
Delay Time of 25 ms
Precision Supply Voltage Monitor 2.5 V, 3 V,
3.3 V, 5 V
Open-Drain Reset Output
Temperature Range . . . 鈥?0擄C to 85擄C
D
D
D
D
Applications Using DSPs, Microcontrollers,
or Microprocessors
Safety Critical Systems
Automotive Systems
Heating Systems
TPS3813
DBV PACKAGE
(TOP VIEW)
WDI
GND
WDT
1
2
3
6
5
4
RESET
WDR
VDD
description
The TPS3813 family of supervisory circuits pro-
vides circuit initialization and timing supervision,
primarily for DSPs and processor-based systems.
During power on, RESET is asserted when supply
voltage (V
DD
) becomes higher than 1.1 V. There
after, the supervisory circuit 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
= 25 ms typical, 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.
For safety critical applications the TPS3813 family incorporates a so-called window-watchdog with
programmable delay and window ratio. The upper limit of the watchdog time-out can be set by either connecting
WDT to GND, V
DD
, or using an external capacitor. The lower limit and thus the window ratio is set by connecting
WDR to GND or V
DD
. The supervised processor now needs to trigger the TPS3813 within this window not to
assert a RESET.
ACTUAL SIZE
3,00 mm x 3,00 mm
typical operating circuit
VDD
0.1
碌F
R
VDD
WDR RESET
TPS3813
WDT
CWP
GND
WDI
I/O
GND
VDD
RESET
uC
0.1
碌F
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.
Copyright
錚?/div>
2001, Texas Instruments Incorporated
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.
POST OFFICE BOX 655303
鈥?/div>
DALLAS, TEXAS 75265
1

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