Datasheet

   
   
SGLS142A − DECEMBER 2002 − REVISED JUNE 2008
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POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D Qualified for Automotive Applications
D ESD Protection Exceeds 2000 V Per
MIL-STD-883, Method 3015; Using Human
Body Model (C = 100 pF, R = 1500 Ω)
D 3-Pin SOT-23 Package
D Supply Current of 9 µA (Typical)
D Precision Supply Voltage Monitor
2.5 V, 3 V, 3.3 V, 5 V
D Power-On Reset Generator With Fixed
Delay Time of 200 ms
D Pin-For-Pin Compatible With MAX 809
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 TPS3809xxxQ-Q1 devices are characterized for operation over a temperature range
of −40°C to 125°C, and are qualified in accordance with AEC-Q100 stress test qualification for integrated
circuits.
typical applications
3.3 V
TPS3809K33
TMS320LC54x
GND
GND
RESET
RESET
V
DD
V
DD
D Applications Using Automotive DSPs,
Microcontrollers, or Microprocessors
D Wireless Communication Systems
D Battery-Powered Equipment
D Programmable Controls
D Intelligent Instruments
D Industrial Equipment
D Automotive Systems
TPS76333
GND
OUTIN5 V
Copyright  2008, Texas Instruments Incorporated
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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.
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3
TPS3809 . . . DBV PACKAGE
(TOP VIEW)
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RESET
V
DD
GND