MAX6800/MAX6801/
MAX6802
3-Pin, Low-Power
μP Reset Circuits
General Description
The MAX6800/MAX6801/MAX6802 microprocessor (μP)
supervisory circuits monitor the power supplies in 2.85V to
5.0V μP and digital systems. They increase circuit reliability
and reduce cost by eliminating external components and
adjustments.
These devices perform a single function—they assert a
reset signal whenever the VCC supply voltage declines
below a preset threshold, keeping it asserted for a preset
timeout period after VCC has risen above the reset
threshold. The only difference among the three devices
is their output. The MAX6801 (push/pull) and MAX6802
(open-drain) have an active-low RESET output, while the
MAX6800 (push/pull) has an active-high RESET output.
The devices are guaranteed to be in the correct state for
VCC down to 0.7V. The MAX6802 is guaranteed to be in
the correct state for VCC down to 1.0V.
The reset comparator in these ICs is designed to ignore
fast transients on VCC. Reset thresholds are factory-
trimmable between 2.63V and 4.80V, in approximately
100mV increments. These devices are available with
a 1ms (min), 20ms (min), or 100ms (min) reset pulse
width. Ideal for space-critical applications, the MAX6800/
MAX6801/MAX6802 come packaged in a 3-pin SOT23.
For a lower threshold voltage version, see the MAX6332/
MAX6333/MAX6334.
Applications
●● Computers
●● Controllers
●● Intelligent Instruments
●● Critical μP/μC Power Monitoring
●● Portable/Battery-Powered Equipment
Selector Guide (Standard Versions*) appears at end of data sheet.
Benefits and Features
●● Ultra-Low 0.7V Operating Supply Voltage
●● Low 4.0μA Supply Current
●● Precision Monitoring of 2.85V to 5.0V Power-
Supply Voltages
●● Reset Thresholds Available from 2.63V to 4.80V, in
Approximately 100mV Increments
●● Fully Specified over Temperature
●● Three Power-On Reset Timeout Periods Available
(1ms min, 20ms min, 100ms min)
●● Low Cost
●● Three Available Output Structures: Push/Pull
RESET, Push/Pull RESET, Open-Drain RESET
●● Guaranteed RESET/RESET Valid to VCC = 0.7V
(MAX6800/MAX6801)
●● Power-Supply Transient Immunity
●● No External Components Required
●● 3-Pin SOT23 Package
●● Pin-Compatible with MAX809/MAX810,
MAX6326/MAX6327/MAX6328, and
MAX6346/MAX6347/MAX6348
Typical Operating Circuit
VCC
VCC
MAX6801
RESET
VCC
µP
RESET
GND GND
19-1933; Rev 5; 2/16