19-1946; Rev 1; 2/01
4-Pin, Low-Power
碌P Reset Circuits with Manual Reset
General Description
The MAX6803/MAX6804/MAX6805 microprocessor (碌P)
supervisory circuits monitor the power supplies in 2.85V
to 5.0V 碌P 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.
o
Low 4.0碌A Supply Current
o
Precision Monitoring of 2.85V to 5.0V Power-
Supply Voltages
o
Reset Thresholds Available from 2.63V to 4.80V,
in Approximately 100mV Increments
o
Debounced Manual Reset Input
o
Fully Specified over Temperature
o
Three Power-On Reset Timeout Periods Available
(1ms min, 20ms min, 100ms min)
o
Low Cost
o
Three Available Output Structures: Push/Pull
RESET,
Push/Pull RESET, Open-Drain
RESET
o
Guaranteed RESET/RESET Valid to V
CC
= 0.7V
(MAX6803/MAX6804)
o
Power-Supply Transient Immunity
o
No External Components Required
o
4-Pin SOT143 Package
o
Pin Compatible with MAX811/MAX812 and
MAX6314/MAX6315
Features
o
Ultra-Low 0.7V Operating Supply Voltage
MAX6803/MAX6804/MAX6805
Applications
Computers
Controllers
Intelligent Instruments
Critical 碌P/碌C Power Monitoring
Portable/Battery-Powered Equipment
Automotive
PART*
MAX6803US_
_D_-T
MAX6804US_
_D_-T
MAX6805US_
_D_-T
Ordering Information
TEMP. RANGE
-40掳C to +125掳C
-40掳C to +125掳C
-40掳C to +125掳C
PIN-PACKAGE
4 SOT143
4 SOT143
4 SOT143
Typical Operating Circuit and Pin Configuration appear
at end of data sheet.
Selector Guide appears at end of data sheet.
*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 鈥淯S鈥?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 鈥淒鈥?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.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
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