MAX6467 Datasheet, PDF (1/9 Pages) Maxim Integrated Products – Microprocessor Supervisory Reset Circuits with Edge-Triggered, One-Shot Manual Reset

19-2523; Rev 0; 7/02
Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
General Description
The MAX6467/MAX6468 microprocessor (µP) supervi-
sory circuits monitor single power-supply voltages from
+1.8V to +5.0V and assert a reset if the supply voltage
drops below its preset threshold. An edge-triggered,
one-shot manual reset function ensures that the µP
enters the reset mode for a fixed timeout period only,
even in the event of a continuously asserted manual
reset. The MAX6467/MAX6468 significantly improve
system reliability compared to traditional manual reset
supervisory circuits.
A variety of factory-trimmed threshold options accommo-
date different supply voltages and tolerances, eliminating
external components. The factory-set thresholds range
from +1.575V to +4.625V to monitor +5.0V, +3.3V, +3.0V,
+2.5V, and +1.8V supplies with various tolerances. Reset
timeout periods of 150ms (min) and 1200ms (min) are
available to accommodate different µP platforms.
A single, active-low RESET output asserts when V_CC
drops below its threshold or if the edge-triggered MR
asserts low. RESET remains low for the reset timeout
period after V_CC rises above its threshold and for a fixed,
one-shot timeout period after a manual reset input falling
edge. RESET remains valid as long as V_CC remains
above +1V. Open-drain (MAX6467) and push-pull
(MAX6468) output options provide additional flexibility in
the system design.
The MAX6467/MAX6468 are offered in the space-saving
4-pin SOT143 package and the ultra-small 4-pin SC70
package and are specified over the automotive (-40°C to
+125°C) temperature range.
Applications
Cell Phones/PDAs
Embedded Control Systems
Industrial Equipment
Automotive Products
Portable/Battery-Powered Equipment
Medical Devices
DSL Modems
MP3 Players
GPS Systems
Digital Cameras
Features
o Precision Factory-Set Reset Threshold Voltages
for +5.0V, +3.3V, +3.0V, +2.5V, and +1.8V Supplies
o Edge-Triggered Manual Reset Input with One-
Shot Pulsed Reset Output
o Two Reset Timeout Period Options (150ms or
1200ms min)
o Immune to Short Voltage Transients
o Low Supply Current (3µA at V_CC = +1.8V)
o RESET Valid to V_CC = +1V
o Active-Low Open-Drain and Push-Pull RESET
Output Options
o -40°C to +125°C Operating Temperature Range
o Small 4-Pin SC70 and SOT143 Packages
o No External Components Required
o Pin Compatible with MAX811, MAX6315,
MAX6384, and MAX6386
Ordering Information
PART
MAX6467XS_ _D_-T
MAX6467US_ _D_-T
MAX6468XS_ _D_-T
MAX6468US_ _D_-T
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
4 SC70-4
4 SOT143-4
4 SC70-4
4 SOT143-4
Note: Insert reset threshold suffix (see Reset Threshold table)
after XS or US. Insert reset timeout delay (see Reset Timeout
Delay table) after D to complete the part number. Sample stock
is generally held on standard versions only (see Standard
Versions table). Standard versions have an order increment
requirement of 2500 pieces. Nonstandard versions have an
order increment requirement of 10,000 pieces. Contact factory
for availability.
Pin Configurations
TOP VIEW
GND 1
RESET 2
MAX6467XS
MAX6468XS
4 V_CC
3 MR
SC70
Typical Operating Circuit appears at end of data sheet.
Pin Configurations continued at end of data sheet.
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