19-1294; Rev 3; 1/00
3-Pin, Ultra-Low-Power SC70/SOT
µP Reset Circuits
General Description
Features
The MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/
MAX6348 microprocessor (µP) supervisory circuits moni-
tor the power supplies in µP and digital systems. These
devices provide excellent circuit reliability and low cost
by eliminating external components and adjustments
when used with 2.5V, 3V, 3.3V, and 5V powered circuits.
♦ Ultra-Low 1µA (max) Supply Current
(MAX6326/MAX6327/MAX6328)
♦ Precision Monitoring of 2.5V, 3V, 3.3V, and 5V
Power-Supply Voltages
♦ Reset Thresholds Available from 2.2V to 4.63V
♦ Fully Specified Over Temperature
♦ 100ms (min) Power-On Reset Pulse Width
♦ Low Cost
These circuits perform a single function: they assert a
reset signal whenever the V
supply voltage declines
CC
below a preset threshold, keeping it asserted for at least
100ms after V has risen above the reset threshold.
CC
♦ Available in Three Versions: Push-Pull RESET,
Push-Pull RESET, and Open-Drain RESET
The only difference between the devices is their output.
The MAX6326/MAX6346 (push-pull) and MAX6328/
MAX6348 (open-drain) have an active-low reset output.
The MAX6327/MAX6347 have an active-high push-pull
reset output. All of these parts are guaranteed to be in
♦ Power-Supply Transient Immunity
♦ No External Components
♦ 3-Pin SC70/SOT23 Packages
the correct state for V
down to 1V. The reset compara-
CC
tor is designed to ignore fast transients on V . Reset
♦ Pin Compatible with MAX803/MAX809/MAX810
CC
thresholds are factory-trimmable between 2.2V and
4.63V, in approximately 100mV increments. Twenty-one
standard versions are available. Contact the factory for
availability of nonstandard versions.
Ordering Information
†
PART
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
3 SC70-3
Ultra-low supply currents (1µA max for the MAX6326/
MAX6327/MAX6328) make these parts ideal for use in
portable equipment. All six devices are available in
space-saving SOT23 and SC70 packages.
MAX6326XR_ _-T
MAX6326UR_ _-T
MAX6327XR_ _-T
MAX6327UR_ _-T
MAX6328XR_ _-T
MAX6328UR_ _-T
MAX6346XR_ _-T
MAX6346UR_ _-T
MAX6347XR_ _-T
MAX6347UR_ _-T
MAX6348XR_ _-T
MAX6348UR_ _-T
3 SOT23-3
3 SC70-3
3 SOT23-3
3 SC70-3
Applications
Intelligent Instruments
3 SOT23-3
3 SC70-3
Computers
Controllers
3 SOT23-3
3 SC70-3
Automotive
Critical µP and µC
Power Monitoring
Portable/Battery-Powered
Equipment
3 SOT23-3
3 SC70-3
3 SOT23-3
Pin Configuration
†The MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/
MAX6348 are available in factory-set V reset thresholds from
CC
2.2V to 4.63V, in approximately 0.1V increments. Choose the
desired reset-threshold suffix from Table 1 and insert it in the
blank spaces following “R.” There are 21 standard versions with
a required order increment of 2500 pieces. Sample stock is gen-
erally held on the standard versions only (see the Selector
Guide). Required order increment is 10,000 pieces for nonstan-
dard versions (Table 2). Contact factory for availability. All
devices available in tape-and-reel only.
TOP VIEW
GND
1
MAX6326
MAX6327
MAX6328
MAX6346
MAX6347
MAX6348
3
V
CC
Selector Guide appears at end of data sheet.
(RESET) RESET
2
SOT23-3/SC70-3
( ) ARE FOR THE MAX6327/MAX6347.
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.