ON MAX809 Series, MAX810 Series Ultra-Low Supply Current 3-Pin Microprocessor Reset Monitors Quick Reference Guide (QRG)
Summary
Monitor critical power rails in embedded systems using these ultra-low current supervisor circuits. Designed for microcontroller and microprocessor protection, they ensure system reliability by monitoring voltage stability and providing an instant reset when power drops or experiences glitches. Ideal for battery-powered devices, hot-plug applications, and complex computing hardware, the circuit eliminates the need for external components. The documentation details precise voltage thresholds, reset timing (1ms to 140ms), and compatibility with various digital systems operating from 1.2V to 4.9V.
Page 1 Text Content
MAX809 Series, MAX810 Series
Very Low Supply Current 3−Pin Microprocessor Reset Monitors
The MAX809 and MAX810 are cost−effective system supervisor http://onsemi.com
circuits designed to monitor VCC in digital systems and provide a reset
signal to the host processor when necessary. No external components MARKING DIAGRAM
are required. The reset output is driven active within 10 sec of VCC falling
SOT−23
through the reset voltage threshold. Reset is maintained active for a xxx M
(TO−236)
timeout period which is trimmed by the factory after VCC rises above
CASE 318
the reset threshold. The MAX810 has an active−high RESET output while the MAX809 has an active−low RESET output. Both devices are available in SOT−23 and SC−70 packages. The MAX809/810 are optimized to reject fast transient glitches on
SC−70
the VCC line. Low supply current of 0.5 A (VCC = 3.2 V) makes these xx M
(SOT−323) devices suitable for battery powered applications. CASE 419
Features Precision VCC Monitor for 1.5 V, 1.8 V, 2.5 V, 3.0 V, 3.3 V, and 5.0 V
xxx = Specific Device Code
Supplies
= Date Code Precision Monitoring Voltages from 1.2 V to 4.9 V Available = Pb−Free Package (Note: Microdot may be in either location)
in 100 m V Steps Four Guaranteed Minimum Power−On Reset Pulse Width Available (1 ms, 20 ms, 100 ms, and 140 ms)
PIN CONFIGURATION
RESET Output Guaranteed to VCC = 1.0 V. Low Supply Current
Compatible with Hot Plug Applications VCC Transient Immunity
No External Components Wide Operating Temperature: −40°C to 105°C
RESET Pb−Free Packages are Available RESET
Typical Applications
SOT−23/SC−70 Computers (Top View) Embedded Systems NOTE: RESET is for MAX809 RESET is for MAX810
Battery Powered Equipment Critical Microprocessor Power Supply Monitoring
ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions section on page 8 of this data sheet.
VCC VCC
MAX809/810 PROCESSOR
DEVICE MARKING INFORMATION
RESET RESET
See general marking information in the device marking
RESET INPUT
section on page 8 of this data sheet.
GND GND
Figure 1. Typical Application Diagram
Semiconductor Components Industries, LLC, 2007 Publication Order Number: February, 2007 − Rev. 15 MAX809S/D
Page Summary Contents For ON MAX809 Series, MAX810 Series Ultra-Low Supply Current 3-Pin Microprocessor Reset Monitors Quick Reference Guide (QRG)
Manual Details
| Brand | Current |
|---|---|
| Pages | 11 |
| File Size | 84.81 KB |
| Published | May 30, 2026 |
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Frequently Asked Questions
What is the difference between MAX809 and MAX810 reset outputs?
The MAX810 has an active-high RESET output, while the MAX809 utilizes an active-low RESET output.
Does this supervisor circuit require external components for implementation?
No external components are required; the device can be implemented directly into a digital system.
Is the MAX809/MAX810 suitable for battery-powered equipment?
Yes, its low supply current of 0.5 µA (at V = 3.2 V) makes it suitable for battery-powered applications.
What is the maximum operating temperature range?
The device supports a wide operating temperature range from −40°C to +105°C.