MAX6803_05 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – 4-Pin, Low-Power uP Reset Circuits with Manual Reset

19-1946; Rev 2; 12/05
4-Pin, Low-Power
µP Reset Circuits with Manual Reset
General Description
The MAX6803/MAX6804/MAX6805 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 com-
ponents and adjustments. They also feature a
debounced manual reset input.
These devices perform a single function: they assert a
reset signal whenever the V_CC supply voltage declines
below a preset threshold or whenever manual reset is
asserted. Reset remains asserted for a preset timeout
period after V_CC has risen above the reset threshold or
after manual reset is deasserted. The only difference
among the three devices is their output. The MAX6804
(push/pull) and MAX6805 (open-drain) have an active-
low RESET output, while the MAX6803 (push/pull) has
an active-high RESET output. The MAX6803/MAX6804
are guaranteed to be in the correct state for V_CC down
to 0.7V. The MAX6805 is guaranteed to be in the cor-
rect state for V_CC down to 1.0V.
The reset comparator in these ICs is designed to ignore
fast transients on V_CC. 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 timeout period.
Ideal for space-critical applications, the MAX6803/
MAX6804/MAX6805 come packaged in a 4-pin
SOT143. For a lower threshold voltage version, see the
MAX6335/MAX6336/MAX6337.
Applications
Computers
Controllers
Intelligent Instruments
Critical µP/µC Power Monitoring
Portable/Battery-Powered Equipment
Automotive
Typical Operating Circuit and Pin Configuration appear
at end of data sheet.
Selector Guide appears at end of data sheet.
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
♦ Debounced Manual Reset Input
♦ 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 V_CC = 0.7V
(MAX6803/MAX6804)
♦ Power-Supply Transient Immunity
♦ No External Components Required
♦ 4-Pin SOT143 Package
♦ Pin Compatible with MAX811/MAX812 and
MAX6314/MAX6315
Ordering Information
PART*
MAX6803US_ _D_-T
MAX6804US_ _D_-T
MAX6805US_ _D_-T
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
4 SOT143
4 SOT143
4 SOT143
*These devices are available in factory-set V_CC reset thresh-
olds from 2.63V to 4.80V, in approximately 0.1V increments.
Choose the desired reset threshold suffix from Table 1 and
insert it in the blanks following “US” in the part number.
Factory-programmed reset timeout periods are also available.
Insert the number corresponding to the desired nominal reset
timeout period (1 = 1ms min, 2 = 20ms min, 3 = 100ms min) in
the blank following “D” in the part number. There are 15 stan-
dard versions with a required order increment of 2500 pieces.
Sample stock is generally held on the standard versions only
(see Selector Guide). Contact the factory for availability of non-
standard versions (required order increment is 10,000 pieces).
All devices available in tape-and-reel only.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
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