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)
Features
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   
N/A    N/A    N/A    N/A   
Catalog    Catalog    Catalog    Catalog   
-40 to 105    -40 to 105    -20 to 85
-40 to 85   
-40 to 105   
None    None    None    None