19-1412; Rev 2; 12/05
4-Pin, Ultra-Low-Voltage, Low-Power
µP Reset Circuits with Manual Reset
General Description
Features
The MAX6335/MAX6336/MAX6337 microprocessor (µP)
supervisory circuits monitor the power supplies in 1.8V
to 3.3V µP and digital systems. They increase circuit reli-
ability and reduce cost by eliminating external compo-
nents and adjustments. They also feature a debounced
manual-reset input.
♦ Ultra-Low 0.7V Operating Supply Voltage
♦ Low 3.3µA Supply Current
♦ Precision Monitoring of 1.8V and 2.5V Power-
Supply Voltages
♦ Reset Thresholds Available from 1.6V to 2.5V,
These devices perform a single function: they assert a
in Approximately 100mV Increments
reset signal whenever the V
supply voltage declines
CC
below a preset threshold or whenever manual reset is
asserted. Reset remains asserted for a preset timeout
♦ Debounced Manual Reset
♦ Fully Specified over Temperature
period after V
has risen above the reset threshold or
CC
after manual reset is deasserted. The only difference
among the three devices is their output. The MAX6336
(push/pull) and MAX6337 (open-drain) have an active-
low RESET output, while the MAX6335 (push/pull) has
an active-high RESET output. The MAX6335/MAX6336
♦ Three Power-On Reset Pulse Widths Available
(1ms min, 20ms min, 100ms min)
♦ Low Cost
♦ Three Available Output Structures: Push/Pull
RESET, Push/Pull RESET, Open-Drain RESET
are guaranteed to be in the correct state for V
down
CC
to 0.7V. The MAX6337 is guaranteed to be in the cor-
rect state for V down to 1.0V.
♦ Guaranteed RESET/RESET Valid to V
= 0.7V
CC
CC
(MAX6335/MAX6336)
The reset comparator in these ICs is designed to ignore
fast transients on V . Reset thresholds are factory-
CC
♦ Power-Supply Transient Immunity
♦ No External Components
♦ 4-Pin SOT143 Package
trimmable between 1.6V and 2.5V, in approximately
100mV increments. There are 15 standard versions
available (2500 piece minimum-order quantity); contact
the factory for availability of nonstandard versions
(10,000 piece minimum-order quantity). For space-criti-
cal applications, the MAX6335/MAX6336/MAX6337
come packaged in a 4-pin SOT143.
♦ Pin Compatible with MAX811/MAX812 and
MAX6314/MAX6315
Ordering Information
Applications
Pentium II™ Computers
Computers
PART*
TEMP. RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
4 SOT143
MAX6335US__D_-T
MAX6336US__D_-T
MAX6337US__D_-T
4 SOT143
Controllers
4 SOT143
Intelligent Instruments
Critical µP/µC Power Monitoring
Portable/Battery-Powered Equipment
Automotive
* These devices are available in factory-set V
reset thresh-
CC
olds from 1.6V to 2.5V, 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.
Typical Operating Circuit and Pin Configuration appear
at end of data sheet.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
Selector Guide appears at end of data sheet.
Pentium II is a trademark of Intel Corp.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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