Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - system monitor Reset/power-on reset SOT 143 4

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 reli-

ability 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

drops below its threshold or if the edge-triggered MR

asserts low. RESET remains low for the reset time-

out period after V

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

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

● Precision Factory-Set Reset Threshold Voltages for

+5.0V, +3.3V, +3.0V, +2.5V, and +1.8V Supplies

● Edge-Triggered Manual Reset Input with One-Shot

Pulsed Reset Output

● Two Reset Timeout Period Options (150ms or

1200ms min)

● Immune to Short Voltage Transients

● Low Supply Current (3µA at V

= +1.8V)

● RESET Valid to V

= +1V

● Active-Low Open-Drain and Push-Pull RESET Output

Options

● -40°C to +125°C Operating Temperature Range

● Small 4-Pin SC70 and SOT143 Packages

● No External Components Required

● Pin Compatible with MAX811, MAX6315, MAX6384,

and MAX6386

Ordering Information appears at end of data sheet.

For related parts and recommended products to use with this part, refer

to www.maximintegrated.com/MAX6467.related.

Typical Operating Circuit appears at end of data sheet.

MAX6467/MAX6468 Microprocessor Supervisory Reset Circuits

with Edge-Triggered, One-Shot Manual Reset

19-2523; Rev 4; 10/14

Summary of content (10 pages)

PAGE 1
MAX6467/MAX6468 Microprocessor Supervisory Reset Circuits with Edge-Triggered, One-Shot Manual Reset General Description Features A variety of factory-trimmed threshold options accommodate 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.
PAGE 2
MAX6467/MAX6468 Microprocessor Supervisory Reset Circuits with Edge-Triggered, One-Shot Manual Reset Absolute Maximum Ratings VCC to GND..........................................................-0.3V to +6.0V RESET to GND Open-Drain........................................................-0.3V to +6.0V Push-Pull............................................... -0.3V to (VCC + 0.3V) MR to GND................................................ -0.3V to (VCC + 0.3V) Input/Output Current (all pins)................
PAGE 3
MAX6467/MAX6468 Microprocessor Supervisory Reset Circuits with Edge-Triggered, One-Shot Manual Reset Electrical Characteristics (VCC = +1.2V to +5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL RESET Output Low CONDITIONS VOL RESET Output Leakage Current (MAX6467 Only) ILKG MIN TYP MAX VCC ≥ +1V, ISINK = 80µA, RESET asserted 0.3 VCC ≥ +2.5V, ISINK = 1.2mA, RESET asserted 0.3 VCC ≥ +4.5V, ISINK = 3.2mA, RESET asserted 0.
PAGE 4
MAX6467/MAX6468 Microprocessor Supervisory Reset Circuits with Edge-Triggered, One-Shot Manual Reset Typical Operating Characteristics (VCC = +5V, MAX6468US29D3 device, TA = +25°C, unless otherwise noted.) 4.5 4.0 VOH (V) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 1 2 3 4 5 6 7 400 300 200 RESET ASSERTS ABOVE THIS LINE 100 0 10 20 30 MR TO RESET DELAY vs.
PAGE 5
MAX6467/MAX6468 Microprocessor Supervisory Reset Circuits with Edge-Triggered, One-Shot Manual Reset Pin Configurations TOP VIEW GND 1 RESET 2 MAX6467XS MAX6468XS 4 VCC GND 1 3 MR RESET 2 MAX6467US MAX6468US 4 VCC 3 MR SOT143 SC70 Pin Description PIN NAME 1 GND FUNCTION Ground Reset Output. RESET is an active-low open-drain (MAX6467) or push-pull (MAX6468) output.
PAGE 6
MAX6467/MAX6468 Microprocessor Supervisory Reset Circuits with Edge-Triggered, One-Shot Manual Reset VCC VTH GND SWITCH BOUNCE MR SWITCH BOUNCE SWITCH BOUNCE GND RESET tRP tMRP tDEB tMRP GND Figure 1. Timing Diagram Detailed Description Reset Output The MAX6467 provides an active-low open-drain RESET output. The MAX6468 provides an active-low push-pull RESET output. RESET asserts low if VCC drops below the selected threshold or if a falling edge occurs on MR.
PAGE 7
MAX6467/MAX6468 Microprocessor Supervisory Reset Circuits with Edge-Triggered, One-Shot Manual Reset Reset Timeout Delay* (min/max) (ms) MR TIMEOUT PERIOD (min/max) (ms) MR RISING DEBOUNCE PERIOD (min/max) (ms) D3 150/300 150/300 150/300 D7 1200/2400 150/300 150/300 RESET TIMEOUT SUFFIX VCC RESET TIMEOUT PERIOD *Additional reset timeout options may be available. Contact factory for availability.
PAGE 8
MAX6467/MAX6468 Microprocessor Supervisory Reset Circuits with Edge-Triggered, One-Shot Manual Reset Standard Versions Reset Threshold (-40°C to +85°C) PART TOP MARK MAX6467XS16D3 AGL SUFFIX VTH (min) VTH (typ) VTH (max) 46 4.509 4.625 4.741 45 4.388 4.500 4.613 44 4.266 4.375 4.484 43 4.193 4.300 4.408 42 4.095 4.200 4.305 41 3.998 4.100 4.203 40 3.900 4.000 4.100 39 3.803 3.900 3.998 38 3.705 3.800 3.895 37 3.608 3.700 3.793 36 3.510 3.600 3.
PAGE 9
MAX6467/MAX6468 Microprocessor Supervisory Reset Circuits with Edge-Triggered, One-Shot Manual Reset Ordering Information PART TEMP RANGE Package Information PINPACKAGE MAX6467XS_ _D_-T -40°C to +125°C 4 SC70-4 MAX6467XS_ _D_/V+T* -40°C to +125°C 4 SC70-4 MAX6467US_ _D_-T -40°C to +125°C 4 SOT143-4 MAX6468XS_ _D_-T -40°C to +125°C 4 SC70-4 MAX6468US_ _D_-T -40°C to +125°C 4 SOT143-4 Note: Insert reset threshold suffix (see Reset Threshold table) after XS or US.
PAGE 10
MAX6467/MAX6468 Microprocessor Supervisory Reset Circuits with Edge-Triggered, One-Shot Manual Reset Revision History REVISION NUMBER REVISION DATE 2 3/14 Added /V OPNs 1 4/14 Removed automotive reference from Applications section 1 6/14 Reversed 4/14 change and added automotive reference back to Applications section 1 10/14 Fixed typo in Package Information section 9 3 4 PAGES CHANGED DESCRIPTION For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4