SLVS363B − AUGUST 2001 − REVISED SEPTEMBER 2004
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1
features
Precision Supply Voltage Supervision
Range: 0.9 V, 1.2 V, 1.5 V, 1.6 V,
2 V, 3.3 V
High Trip Point Accuracy: 0.75%
Supply Current of 1.2 µA (Typ)
RESET Defined With Input Voltages as Low
as 0.4 V
Power On Reset Generator With a Delay
Time of 130 ms
Push/Pull or Open-Drain RESET Outputs
SOT23-6 Package
Temperature Range ... −40°C to 85°C
typical applications
Applications Using Low-Power DSPs,
Microcontrollers or Microprocessors
Portable/Battery-Powered Equipment
Intelligent Instruments
Wireless Communication Systems
Programmable Controls
Industrial Equipment
Notebook/Desktop Computers
Automotive Systems
description
The TPS310x, TPS311x families of supervisory
circuits provide circuit initialization and timing
supervision, primarily for DSP and processor-
based systems.
During power on, RESET
is asserted when the
supply voltage (V
DD
) becomes higher than 0.4 V.
Thereafter, the supervisory circuit monitors V
DD
and keeps the RESET output 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 to ensure proper system reset. The
delay time starts after V
DD
has risen above the V
IT
.
When the V
DD
drops below the V
IT
, the output
becomes active again.
All the devices of this family have a fixed-sense threshold voltage (V
IT
) set by an internal voltage divider.
2001 − 2004 Texas Instruments Incorporated
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(TOP VIEW)
RESET
GND
MR
V
DD
PFI
TPS3103
DBV PACKAGE
PFO
(TOP VIEW)
RSTVDD
GND
MR
V
DD
SENSE
TPS3106
DBV PACKAGE
RSTSENSE
(TOP VIEW)
RESET
GND
MR
V
DD
SENSE
TPS3110
DBV PACKAGE
WDI
TPS3106E33DBV
V
DD
RSTVDD
RSTSENSE
GND
SENSE
R1
R2
GND
V
core
V
IO
RESET
R3
DSP
3.3 V
1.6 V
GND
typical application circuit
3
2
4
6
1
5
3
2
4
6
1
5
3
2
4
6
1
5
MR
