TPS3808G01-Q1 Datasheet, PDF (1/20 Pages) Texas Instruments – LOW-QUIESCENT-CURRENT PROGRAMMABLE-DELAY SUPERVISORY CIRCUIT

TPS3808-Q1
www.ti.com
SBVS085H – JANUARY 2007 – REVISED JUNE 2012
LOW-QUIESCENT-CURRENT PROGRAMMABLE-DELAY SUPERVISORY CIRCUIT
Check for Samples: TPS3808-Q1
FEATURES
1
• Qualified for Automotive Applications
• Power-On Reset Generator With Adjustable
Delay Time: 1.25 ms to 10 s
• Very Low Quiescent Current: 2.4 μA Typ
• High Threshold Accuracy: 0.5% Typ
• Fixed Threshold Voltages for Standard Voltage
Rails From 1.2 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 Package
APPLICATIONS
• DSP or Microcontroller Applications
• Notebook/Desktop Computers
• PDAs/Hand-Held Products
• Portable/Battery-Powered Products
• FPGA/ASIC Applications
DESCRIPTION
The TPS3808 microprocessor supervisory circuits
monitor 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 MR return
above their 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
SOT-23 package and is fully specified over a
temperature range of –40°C to 125°C (T_J).
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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
DRV PACKAGE
(TOP VIEW)
V_DD 1
SENSE 2
C_T 3
6 RESET
5 GND
4 MR
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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.
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