Datasheet

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19-2690; Rev 3; 5/14

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 operating 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

● 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

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

ed and lead(Pb)-free packaging. Specify lead free by adding

the + symbol at the end of the part number when ordering.

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

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

MAX700/MAX701/MAX702 Power-Supply Monitor with Reset

Pin Congurations

Ordering Information

Summary of content (6 pages)

PAGE 1
MAX700/MAX701/MAX702 Power-Supply Monitor with Reset 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 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.
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
MAX700/MAX701/MAX702 Power-Supply Monitor with Reset 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 RESET Output High RESET Output Low RESET Output High ISINK = 16mA, VCC = 5V 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 ISINK = 0.
PAGE 4
MAX700/MAX701/MAX702 Power-Supply Monitor with Reset Pin Description PIN 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
MAX700/MAX701/MAX702 Power-Supply Monitor with Reset 1M MR 1 8 VCC MANUAL RESET BUTTON 7 CTL COMPARATOR SENSE 2 1 150k N.C. MAX700 2 3 1.29VREF R RC 6 RESET 4 R OSC HYST 3 MAX700 MR VCC SENSE CTL HYST RESET GND RESET 8 +5V 7 6 N.C. 5 TO µP 5 RESET GND 4 Figure 1. MAX700 Block Diagram MANUAL RESET BUTTON VIN R1 MAX700 1 MR 2 R2 Figure 2.
PAGE 6
MAX700/MAX701/MAX702 Power-Supply Monitor with Reset Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 3/90 Initial release — 1 11/05 Added lead-free information to the Ordering Information table. 1 2 12/07 Updated Pin Description table. 4 3 5/14 No /V OPNs; removed automotive reference from Applications section 1 DESCRIPTION For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.