19-1411; Rev 1; 6/00
3-Pin, Ultra-Low-Voltage, Low-Power
µP Reset Circuits
General Description
Features
The MAX6332/MAX6333/MAX6334 microprocessor (µP)
supervisory circuits monitor the power supplies in 1.8V
to 3.3V µP and digital systems. They increase circuit
reliability and reduce cost by eliminating external com-
ponents and adjustments.
ꢀ Ultra-Low 0.7V Operating Supply Voltage
ꢀ Low 3.3µA Supply Current
ꢀ Precision Monitoring of 1.8V and 2.5V Power-
Supply Voltages
These devices perform a single function: they assert a
ꢀ Reset Thresholds Available from 1.6V to 2.5V,
reset signal whenever the V
supply voltage declines
CC
in Approximately 100mV Increments
below a preset threshold, keeping it asserted for a pre-
set timeout period after V has risen above the reset
ꢀ Fully Specified over Temperature
CC
threshold. The only difference among the three devices
is their output. The MAX6333 (push/pull) and MAX6334
(open-drain) have an active-low RESET output, while
the MAX6332 (push/pull) has an active-high RESET out-
put. The MAX6332/MAX6333 are guaranteed to be in
ꢀ 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
the correct state for V
down to 0.7V. The MAX6334 is
CC
guaranteed to be in the correct state for V
1.0V.
down to
CC
ꢀ Guaranteed RESET/RESET Valid to V
= 0.7V
CC
The reset comparator in these ICs is designed to ignore
fast transients on V . Reset thresholds are factory-
CC
(MAX6332/MAX6333)
ꢀ Power-Supply Transient Immunity
ꢀ No External Components
ꢀ 3-Pin SOT23 Package
trimmable between 1.6V and 2.5V, in approximately
100mV increments. There are 15 standard versions
available (2,500 piece minimum-order quantity); con-
tact the factory for availability of nonstandard versions
(10,000 piece minimum-order quantity). For space-criti-
cal applications, the MAX6332/MAX6333/MAX6334
come packaged in a 3-pin SOT23.
ꢀ Pin Compatible with MAX809/MAX810 and
MAX6326/MAX6327/MAX6328
Applications
Pentium II™ Computers
Computers
Ordering Information
Controllers
PART*
TEMP. RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
3 SOT23-3
MAX6332UR__D_-T
MAX6333UR__D_-T
MAX6334UR__D_-T
Intelligent Instruments
3 SOT23-3
Critical µP/µC Power Monitoring
Portable/Battery-Powered Equipment
Automotive
3 SOT23-3
* 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 “UR” 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.
Selector Guide appears at end of data sheet.
Pentium II is a trademark of Intel Corp.
________________________________________________________________ Maxim Integrated Products
1
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