SLVS228B – AUGUST 1999 – REVISED JULY 2012
3-PIN SUPPLY VOLTAGE SUPERVISORS
Check for Samples:
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FEATURES
3-Pin SOT-23 Package
Supply Current of 9
μA
(Typical)
Precision Supply Voltage Monitor
2.5 V, 3 V, 3.3 V, 5 V
Pin-For-Pin Compatible With MAX 809
Temperature Range: –40°C to +85°C
APPLICATIONS
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Applications Using DSPs, Microcontrollers, or
Microprocessors
Wireless Communication Systems
Portable/Battery-Powered Equipment
Programmable Controls
Intelligent Instruments
Industrial Equipment
Notebook/Desktop Computers
Automotive Systems
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DESCRIPTION
The TPS3809 family of supervisory circuits provides 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 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
3-pin SOT-23. The TPS3809 devices are characterized for operation over a temperature range of –40°C to 85°C.
spacer
Figure 2. Typical Application
TPS76333
3.3 V
Figure 1. DBV PACKAGE
TOP VIEW)
GND
1
3
RESET
2
VDD
5V
IN
GND
OUT
VDD
VDD
TPS3809K33
RESET
GND
RESET
GND
TMS320LC54x
1
2
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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Copyright © 1999–2012, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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