_______________General Description

In applications with microprocessors (µPs) that have a

RESET input, the MAX7705 is functionally and socket

compatible with the TL7705, but requires no external

components. It provides power-supply glitch immunity

and a guaranteed power-up reset delay, while typically

The MAX7705 monitors the power supply in µP and digital

systems. The

The device offers excellent circuit reliability and low cost

by eliminating external components and adjustments.

A system reset is provided during power-up, power-

reset threshold,

RESET is low and holds the µP in reset.

reset threshold. The MAX7705 is available in 8-pin DIP

and SO packages.

________________________Applications

Minimum Component Count, Low-Cost

Processor Systems

____________________________Features

o No External Components

o Low Cost

o Precise Reset Threshold

o 280ms Power-On Reset Delay

o 8-Pin DIP and SO Packages

______________Ordering Information

* Contact factory for dice specifications.

µP Power-Supply Monitor

with Reset

________________________________________________________________

Maxim Integrated Products

1

1

2

3

4

8

7

6

5

N.C.

N.C.

RESET

GND

N.C.

N.C.

N.C.

MAX7705

VCC

RESET

GND

µP

*

*

*

* THE MAX7705 ELIMINATES THREE EXTERNAL

COMPONENTS REQUIRED BY THE TL7705.

__________________Pin Configuration

1

2

3

4

8

7

6

5

N.C.

N.C.

RESET

GND

N.C.

N.C.

N.C.

MAX7705

DIP/SO

TOP VIEW

__________Typical Operating Circuit

Call toll free 1-800-998-8800 for free samples or literature.

19-0151; Rev 0; 6/93

PART

TEMP. RANGE

PIN-PACKAGE

MAX7705CPA

0°C to +70°C

8 Plastic DIP

MAX7705CSA

0°C to +70°C

8 SO

MAX7705C/D

0°C to +70°C

Dice*

FEATURE

MAX7705

TL7705

No. of External

Components Required

0

3

Operating Supply

Current

65µA

1.8mA

Power-Supply Glitch

Immunity

Yes

No

Guaranteed Minimum

Reset Delay

Yes

No

+5V

+3V

35µA

1.8mA

MAX7705EPA

-40°C to +85°C

8 Plastic DIP

MAX7705ESA

-40°C to +85°C

8 SO