TPS3808_17 Datasheet, PDF (1/32 Pages) Texas Instruments – Low-Quiescent-Current, Programmable-Delay Supervisory Circuit

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TPS3808
SBVS050K – MAY 2004 – REVISED OCTOBER 2015
TPS3808 Low-Quiescent-Current, Programmable-Delay Supervisory Circuit
1 Features
•1 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% Typ
• 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: –40°C to 125°C
• Small SOT-23 and 2-mm × 2-mm WSON
Packages
2 Applications
• DSP or Microcontroller Applications
• Notebook and Desktop Computers
• PDAs and Hand-Held Products
• Portable and Battery-Powered Products
• FPGA and ASIC Applications
3 Description
The TPS3808 family of microprocessor supervisory
circuits monitors system voltages from 0.4 V to 5 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 device 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
device has a very low typical quiescent current of
2.4 μA, so it is well-suited to battery-powered
applications. It is available in the SOT-23 and 2-mm ×
2-mm WSON packages, and is fully specified over a
temperature range of –40°C to 125°C (T_J).
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS3808
SOT-23 (6)
WSON (6)
2.90 mm x 1.60 mm
2.00 mm x 2.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application
1.2 V
3.3 V
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
Supply Current vs Supply Voltage
4.0
-40°C
25°C
3.5
85°C
125°C
3.0
2.5
2.0
1.5
1.5
2.5
3.5
4.5
5.5
6.5
V_DD (V)
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.