LM809 3-pin voltage supervisor (reset IC) with push-pull reset for supply monitoring | TI.com

LM809
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3-pin voltage supervisor (reset IC) with push-pull reset for supply monitoring

 

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Description

The LM809 and LM810 microprocessors supervisory circuits can be used to monitor the power supplies in microprocessor and digital systems. They provide a reset to the microprocessor during power-up, power-down and brown-out conditions.

The function of the LM809 and LM810 are to monitor the VCC supply voltage, and assert a reset signal whenever this voltage declines below the factory-programmed reset threshold. The reset signal remains asserted for 240 ms after VCC rises above the threshold. The LM809 has an active-low RESET output, while the LM810 has an active-high RESET output.

Seven standard reset voltage options are available, suitable for monitoring 5-V, 3.3-V, and 3-V supply voltages.

With a low supply current of only 15 µA, the LM809 and LM810 are ideal for use in portable equipment.

Features

  • Precision Monitoring of Supply Voltages
    • Available Threshold Options:
      2.63 V, 2.93 V, 3.08 V, 4.38 V, 4.63 V
  • Superior Upgrade to MAX809 and MAX810
  • Fully Specified Over Temperature
  • 140-ms Minimum Power-On Reset Pulse Width,
    240-ms Typical
    • Active-Low RESET Output (LM809)
    • Active-High RESET Output (LM810)
  • Ensured RESET Output Valid for VCC ≥ 1 V
  • Low Supply Current, 15-µA Typical
  • Power Supply Transient Immunity

Parametrics

Compare all products in Supervisor & reset ICs Email Download to Excel
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) Watchdog timer WDI (sec)
LM809 Order now 2.63
2.93
3.08
4.38
4.63    
1     5.5     1     Active-low
Push-pull    
240     Ease-of-use     Catalog     -40 to 105     None    
LM810 Order now 4.63     1     5.5     1     Active-high
Push-pull    
240     Ease-of-use     Catalog     -40 to 105     None    
TLV809 Order now 2.25
2.64
2.93
4.55    
1     6     2     Active-low
Push-pull    
200     Ease-of-use     Catalog     -40 to 85     None    
TPS3839 Order now 0.9
1.1
1.52
1.67
2.325
2.63
2.93
3.08
4.38    
1     6.5     0.9     Active-low
Push-pull    
200     Ease-of-use     Catalog     -40 to 85     None