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SBVS050I – MAY 2004 – REVISED AUGUST 2008
Low Quiescent Current, Programmable-Delay
Supervisory Circuit
1
FEATURES
DESCRIPTION
The
TPS3808xxx
family
of
microprocessor
supervisory circuits monitor system voltages from
0.4V to 5.0V, asserting an open-drain RESET signal
when the SENSE voltage drops below a preset
threshold or when the manual reset (MR) pin drops to
a logic low. The RESET output remains low for the
user-adjustable delay time after the SENSE voltage
and manual reset (MR) return above the respective
thresholds.
The TPS3808 uses a precision reference to achieve
0.5% threshold accuracy for V
IT
≤
3.3V. The reset
delay time can be set to 20ms by disconnecting the
C
T
pin, 300ms by connecting the C
T
pin to V
DD
using
a resistor, or can be user-adjusted between 1.25ms
and 10s by connecting the C
T
pin to an external
capacitor. The TPS3808 has a very low typical
quiescent current of 2.4µA so it is well-suited to
battery-powered applications. It is available in a small
SOT23 and an ultra-small 2mm × 2mm QFN
PowerPAD™ package, and is fully specified over a
temperature range of –40°C to +125°C (T
J
).
DBV PACKAGE
SOT23
(TOP VIEW)
•
Power-On Reset Generator with Adjustable
Delay Time: 1.25ms to 10s
•
Very Low Quiescent Current: 2.4µA typ
•
High Threshold Accuracy: 0.5% typ
•
Fixed Threshold Voltages for Standard Voltage
Rails from 0.9V to 5V and Adjustable Voltage
Down to 0.4V Are Available
•
Manual Reset (MR) Input
•
Open-Drain RESET Output
•
Temperature Range: –40°C to +125°C
•
Small SOT23 and 2mm × 2mm QFN Packages
23
APPLICATIONS
•
•
•
•
•
DSP or Microcontroller Applications
Notebook/Desktop Computers
PDAs/Hand-Held Products
Portable/Battery-Powered Products
FPGA/ASIC Applications
1.2V
3.3V
SENSE V
DD
SENSE V
DD
V
I/O
V
CORE
RESET
GND
1
2
3
6
5
4
V
DD
SENSE
C
T
TPS3808G12
RESET
C
T
GND
TPS3808G33
MR
C
T
DSP
MR
RESET
GND
GPIO
GND
DRV PACKAGE
2mm x 2mm QFN
(TOP VIEW)
V
DD
1
2
3
Power
PAD
6
5
4
RESET
GND
MR
Typical Application Circuit
SENSE
C
T
1
2
3
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.
PowerPAD is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
Copyright © 2004–2008, 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.
TI [ TEXAS INSTRUMENTS ]
