TPS3808 Low-quiescent current supervisor with programmable-delay and manual reset | TI.com

TPS3808
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
Low-quiescent current supervisor with programmable-delay and manual reset

 

Recommended alternative parts

  • TPS3890  -  Lower Iq at 2.1 µA and offers the same features as the TPS3808
  • TPS3840  -  Offers more fixed voltage threshold options, a wide 10-V input voltage, low IQ (350 nA) and 1% threshold accuracy

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 VIT ≤ 3.3 V. The reset delay time can be set to 20 ms by disconnecting the CT pin, 300 ms by connecting the CT pin to VDD using a resistor, or can be user-adjusted between 1.25 ms and 10 s by connecting the CT 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 (TJ).

Features

  • 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

Parametrics

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Part number Order Threshold voltage 1 (Typ) (V) Number of supplies monitored VCC (Max) (V) VCC (Min) (V) Output driver type/reset output Time delay (ms) Features Rating Operating temperature range (C) TI functional safety category Watchdog timer WDI (sec)
TPS3808 Order now Adjustable
0.84
1.12
1.16
1.4
1.67
1.77
2.33
2.79
3.07
4.65    
1     6.5     1.8     Active-low
Open-drain    
Programmable     Active-low enable
Manual reset    
Catalog     -40 to 125       None    
LM8365 Order now 2.7
4.5    
1     6     1     Active-low
Open-drain    
Programmable       Catalog     -40 to 85       None    
TPS3808-Q1 Order now Adjustable
1.12
1.16
1.4
1.67
2.79
3.07
4.65    
1     6.5     1.8     Active-low
Open-drain    
Programmable     Active-low enable
Manual reset    
Automotive     -40 to 125     Functional safety-capable     None    
TPS3840 Order now Trimmable
1.8
2
2.2
2.5
2.7
2.8
2.9
3
4.3
4.5    
1     10     1.5     Active-high
Active-low
Open-drain
Push-pull    
Programmable     Manual reset     Catalog     -40 to 125       None    
TPS3890 Order now Adjustable
1.15
1.44
1.73
2.4
2.89
3.17    
1     5.5     1.5     Active-low
Open-drain    
Programmable     Active-low enable
Manual reset    
Catalog     -40 to 125       None    
TPS3890-Q1 Order now Adjustable
1.15
1.44
1.73
2.4
2.89
2.93
3.066
3.17
4.4
4.65
4.8    
1     5.5     1.5     Active-low
Open-drain    
Programmable     Active-low enable
Manual reset    
Automotive     -40 to 125     Functional safety-capable     None    
TPS3895 Order now Adjustable     1     6.5     1.7     Active-low
Push-pull    
Programmable     Active-high enable
Manual reset    
Catalog     -40 to 125       None    
TPS3896 Order now Adjustable     1     6.5     1.7     Active-high
Push-pull    
Programmable     Active-low enable
Manual reset    
Catalog     -40 to 125