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15.11.3.
Pin Description
15.12. LM809
15.12.1.
General Description
The LM809/810 microprocessor 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 LM809/810 is 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 5V, 3.3V, and 3V supply voltages. With a
low supply current of only 15µA, the LM809/810 are ideal for use in portable equipment.
15.12.2.
Features
•
Precise monitoring of 3V, 3.3V, and 5V supply voltages
•
Superior upgrade to MAX809/810
•
Fully specified overtemperature
•
140 ms min. Power-On Reset pulse width, 240 ms typical
Active-low RESET Output(LM809)
Active-high RESET Output(LM810)
•
Guaranteed RESET Output valid for VCC
≥
1V
•
Low Supply Current, 15µAtyp
•
Power supply transient immunity
15.12.3.
Pinning
15.13. MSP34X1G
(MSP3411G)
Multistandard Sound Processor Family
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