TPS3801J25, TPS3801L30, TPS3801K33, TPS3801I50
ULTRA-SMALL SUPPLY VOLTAGE SUPERVISORS
SLVS219 鈥?AUGUST 1999
D
D
D
D
D
D
5-Pin SC-70 (SOT-323) Package
Supply Current of 9
碌A
(Typ)
Power-On Reset Generator With Fixed
Delay Time of 200 ms
Precision Supply Voltage Monitor 2.5 V, 3 V,
3.3 V, 5 V
Manual Reset Input
Temperature Range . . . 鈥?0擄C to 85擄C
TPS3801 . . . DCK PACKAGE
(TOP VIEW)
GND
GND
RESET
1
2
3
4
VDD
5
MR
description
The TPS3801 family of supervisory circuits provide circuit initialization and timing supervision, primarily for
DSPs and processor-based systems.
During power-on, RESET is asserted when the supply voltage V
DD
becomes higher than 1.1 V. Thereafter, 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(typ)
= 200 ms, 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.
The TPS3801 devices incorporate a manual reset input, MR. A low level at MR causes RESET to become
active.
The product spectrum is designed for supply voltages of 2.5 V, 3 V, 3.3 V, and 5 V. The circuits are available
in a 5-pin SC-70 (SOT-323) package which is only about half the size of a 5-pin SOT-23 package.
The TPS3801 devices are characterized for operation over a temperature range of 鈥?0擄C to 85擄C.
typical applications
VDD = 3.3 V
100 nF
VDD
TPS3801K33
MR
RESET
GND
RESET
GND
VDD
TMS320LC54x
D
D
D
D
D
D
D
D
Applications Using DSPs, Microcontrollers,
or Microprocessors
Wireless Communication Systems
Portable/Battery-Powered Equipment
Programmable Controls
Intelligent Instruments
Industrial Equipment
Notebook/Desktop Computers
Automotive Systems
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.
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.
Copyright
漏
1999, Texas Instruments Incorporated
POST OFFICE BOX 655303
鈥?/div>
DALLAS, TEXAS 75265
1
1
2
3
4
5
6
7
8
9
