LM809 (ACTIVE)

Active Low Wide Temperature 3-Pin Reset IC

Active Low Wide Temperature 3-Pin Reset IC - LM809
 

Recommended alternative parts

  • LM810  -  Active High Version

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

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Parametrics Compare all products in Supervisor and Reset IC

 
Threshold Voltage 1 (Typ) (V)
# of Supplies Monitored
VCC (Max) (V)
VCC (Min) (V)
Output Driver Type / Reset Output
Time Delay (ms)
Rating
Operating Temperature Range (C)
Watchdog Timer WDI (sec)
LM809 LM810 LP3470 MCP809
2.63
2.93
3.08
4.38
4.63   
4.63    2.63
2.75
2.83
2.93
3.08
3.65
4
4.38
4.63
4.8   
2.93   
1    1    1    1   
5.5    5.5    5    5.5   
1    1    0.5    1.2   
Active-low
Push-pull   
Active-high
Push-pull   
Active-low
Open-drain   
Active-low
Push-pull   
240    240    Programmable    240   
Catalog    Catalog    Catalog    Catalog   
-40 to 105    -40 to 105    -20 to 85
-40 to 85   
-40 to 105   
None    None    None    None