LM809
LM809 is 3-Pin Microprocessor Reset Circuits manufactured by Texas Instruments.
Features
- 1 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
2 Applications
- Factory Automation
- Building Automation
- Programmable Logic Control
- Renewable Energy
- Microprocessor Systems
- puters
- Controllers
- Intelligent Instruments
- Portable/Battery-Powered Equipment
- Automotive
3 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, powerdown 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 factoryprogrammed 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.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM809, LM810
SOT-23 (3)
2.92 mm × 1.30 mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.
Typical Application for Microprocessor Reset Circuit
RESET
µP...
