TPS3808-EP Datasheet, PDF (1/15 Pages) Texas Instruments – LOW QUIESCENT CURRENT, PROGRAMMABLE DELAY SUPERVISORY CIRCUIT

TPS3808-EP
www.ti.com ................................................................................................................................................. SBVS103C – APRIL 2008 – REVISED NOVEMBER 2008
LOW QUIESCENT CURRENT, PROGRAMMABLE DELAY SUPERVISORY CIRCUIT
FEATURES
1
•2 Power-On Reset Generator With Adjustable
Delay Time: 1.25 ms to 10 s
• Very Low Quiescent Current: 2.4 µA Typical
• High Threshold Accuracy: 0.5% Typical
• Fixed Threshold Voltages for Standard Voltage
Rails from 0.9 V to 5 V and Adjustable Voltage
Down to 0.4 V Are Available
• Manual Reset (MR) Input
• Open-Drain RESET Output
• Temperature Range: –55°C to 125°C
• Small SOT23 Package
SUPPORTS DEFENSE, AEROSPACE,
AND MEDICAL APPLICATIONS
• Controlled Baseline
• One Assembly/Test Site
• One Fabrication Site
• Available in Military (–55°C/125°C)
Temperature Range⁽¹⁾
• Extended Product Life Cycle
• Extended Product-Change Notification
• Product Traceability
APPLICATIONS
• DSP or Microcontroller Applications
• Notebook/Desktop Computers
• PDAs/Hand-Held Products
• Portable/Battery Powered Products
• FPGA/ASIC Applications
(1) Custom temperature ranges available
DESCRIPTION/ORDERING INFORMATION
The TPS3808xxx family of microprocessor supervisory circuits monitors system voltages from 0.4 V to 5.0 V,
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 ≤ 3.3 V. The reset delay
time can be set to 20 ms by disconnecting the C_T pin, 300 ms by connecting the C_T pin to V_DD using a resistor,
or can be user-adjusted between 1.25 ms and 10 s by connecting the C_T pin to an external capacitor. The
TPS3808 has a very low typical quiescent current of 2.4 µA, so it is well-suited to battery-powered applications. It
is available in a small SOT23 package, and is fully specified over a temperature range of –55°C to +125°C (T_J).
1.2 V
3.3 V
DBV (SOT-23) PACKAGE
(TOP VIEW)
SENSE V
DD
TPS3808G12
RESET
C
T _GND
SENSE V
DD
TPS3808G33
MR
RESET
C
T _GND
V
I/O
V
CORE
DSP
GPIO
GND
RESET 1
GND
2
MR
3
6
V
DD
5
SENSE
4
C
T
Typical Application Circuit
1
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Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
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.
Copyright © 2008, Texas Instruments Incorporated