Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - system monitor Reset/power-on reset SOIC 8

General Description

The MAX700/MAX701/MAX702 are supervisory circuits

used to monitor the power supplies in microprocessor

(µP) and digital systems. The RESET/RESET outputs of

the MAX700/MAX701/MAX702 are guaranteed to be in

the correct state for V

voltages down to +1V (Figure 4).

They provide excellent circuit reliability and low cost by

eliminating external components and adjustments when

used with +5V-powered circuits.

The MAX702 is the simplest part in the family. When

falls to 4.65V, RESET goes low. The MAX702 also

provides a debounced manual reset input. The

MAX701 performs the same functions but has both

RESET and RESET outputs. Their primary function is to

provide a system reset. Accordingly, an active reset

signal is supplied for low supply voltages and for at

least 200ms after the supply voltage reaches its operat-

ing value.

In addition to the features of the MAX701 and MAX702,

the MAX700 provides preset or adjustable voltage

detection so thresholds other than 4.65V can be select-

ed, and adjustable hysteresis. All parts are supplied in

8-pin PDIP and Narrow SO packages in commercial

and extended temperature ranges.

Applications

Computers

Controllers

Intelligent Instruments

Automotive Systems

Critical µP Power Monitoring

Features

♦ Min 200ms RESET Pulse on Power-Up, Power-

Down, and During Low-Voltage Conditions

♦ Reset Threshold Factory Trimmed for +5V

Systems

♦ No External Components or Adjustments with

+5V-Powered Circuits

♦ Debounced Manual Reset Input

♦ Preset or Adjustable Voltage Detection (MAX700)

♦ Adjustable Hysteresis (MAX700)

♦ 8-Pin PDIP and Narrow SO Packages

MAX700/MAX701/MAX702

Power-Supply Monitor with Reset

________________________________________________________________

Maxim Integrated Products

19-2690; Rev 2; 12/07

For pricing delivery, and ordering information please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

RESET

RESETGND

CTLSENSE

HYST

DIP/SO

TOP VIEW

MAX700

RESET

GND

N.C.N.C.

N.C.

DIP/SO

MAX701

N.C.

RESET

GND

N.C.

DIP/SO

MAX702

Pin Configurations

Ordering Information

PART* TEMP RANGE PIN-PACKAGE

MAX700C/D 0°C to +70°C Dice

MAX700CPA 0°C to +70°C 8 PDIP

MAX700CSA 0°C to +70°C 8 Narrow SO

MAX700EPA -40°C to +85°C 8 PDIP

MAX700ESA -40°C to +85°C 8 Narrow SO

MAX701C/D 0°C to +70°C Dice

MAX701CPA 0°C to +70°C 8 PDIP

MAX701CSA 0°C to +70°C 8 Narrow SO

MAX701EPA -40°C to +85°C 8 PDIP

MAX701ESA -40°C to +85°C 8 Narrow SO

MAX702C/D 0°C to +70°C Dice

MAX702CPA 0°C to +70°C 8 PDIP

MAX702CSA 0°C to +70°C 8 Narrow SO

MAX702EPA -40°C to +85°C 8 PDIP

MAX702ESA -40°C to +85°C 8 Narrow SO

Devices in PDIP and SO packages are available in both lead-

ed and lead-free packaging. Specify lead free by adding the +

symbol at the end of the part number when ordering.

Summary of content (6 pages)

PAGE 1
9-2690; Rev 2; 12/07 Power-Supply Monitor with Reset The MAX700/MAX701/MAX702 are supervisory circuits used to monitor the power supplies in microprocessor (µP) and digital systems. The RESET/RESET outputs of the MAX700/MAX701/MAX702 are guaranteed to be in the correct state for VCC voltages down to +1V (Figure 4). They provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with +5V-powered circuits. The MAX702 is the simplest part in the family.
PAGE 2
MAX700/MAX701/MAX702 Power-Supply Monitor with Reset ABSOLUTE MAXIMUM RATINGS VCC ......................................................................-0.3V to +15.5V Voltage (with respect to GND) at RESET, RESET, HYST, CTL, SENSE ............................................-0.3V to VCC Operating Temperature Range C Suffix .............................................................0°C to +70°C E Suffix...........................................................-40°C to +85°C Rate of Rise, VCC ..........
PAGE 3
Power-Supply Monitor with Reset MAX700/MAX701/MAX702 ELECTRICAL CHARACTERISTICS (continued) (VCC = +5V, CTL = GND on MAX700, TA = +25°C, unless otherwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS 0.4 V MAX701 RESET Output Low ISINK = 16mA, VCC = 5V RESET Output High RESET Output Low RESET Output High ISOURCE = 3.2mA, VCC = 4.25V VCC 0.4 ISOURCE = 1.6mA, VCC = 3V VCC 0.4 ISOURCE = 0.5mA, VCC = 1.5V VCC 0.4 V ISINK = 3.2mA, VCC = 4.25V 0.4 ISINK = 1.6mA, VCC = 3V 0.4 ISINK = 0.
PAGE 4
Power-Supply Monitor with Reset MAX700/MAX701/MAX702 Pin Description PIN 4 NAME MAX700 MAX701 MAX702 1 1 1 MR 2 — — SENSE FUNCTION Input for Manual Pushbutton Reset. Has internal 5µA pullup. Low input activates the RESET/RESET outputs. The voltage-sense input when CTL = VCC. Its threshold is 1.29V. SENSE always remains connected to the internal comparator. So, when VCC is being monitored internally (CTL = GND), SENSE should be left open circuit.
PAGE 5
Power-Supply Monitor with Reset 1MΩ 1 8 7 COMPARATOR SENSE 2 VCC MANUAL RESET BUTTON CTL 1 150kΩ N.C. MAX700 RC 6 R OSC HYST 4 RESET MAX700 MR SENSE VCC CTL RESET HYST RESET GND 8 +5V 7 6 N.C. 5 TO µP 3 5 GND 2 3 1.29V REF R MAX700/MAX701/MAX702 MR RESET 4 Figure 2. MAX700 Typical Connection Diagram Figure 1. MAX700 Block Diagram MANUAL RESET BUTTON 1 R1 2 VIN R2 MR MAX700 VCC SENSE CTL 8 VIN 3V TO 15V 7 2V/div RESET R3 3 4 HYST GND RESET RESET 6 N.C.
PAGE 6
MAX700/MAX701/MAX702 Power-Supply Monitor with Reset Revision History REVISION NUMBER REVISION DATE 0 3/90 1 11/05 Added lead-free information to the Ordering Information table. 1 2 12/07 Updated Pin Description table. 4 DESCRIPTION Initial release PAGES CHANGED — Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.