Power-Supply Monitor with Reset

________________________________________________________________ Maxim Integrated Products

1

N.C.

N.C.

RESET

N.C.

GND

N.C.

N.C.

1

2

3

4

8

7

6

5

DIP/SO/

µMAX

MAX709

__________________Pin Configuration

TOP VIEW

RESET

GND

GND

µP

MAX709

RESET

__________Typical Operating Circuit

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

19-0136; Rev. 1; 6/94

_______________General Description

The MAX709 provides a system reset during power-up,

below the reset threshold, RESET goes low and holds

threshold.

The RESET output is guaranteed to be in the correct

excellent circuit reliability and low cost by eliminating

external components and adjustments when used with

+5V, +3.3V, or +3V powered systems. The MAX709 is

available 8-pin DIP, µMAX, and SO packages.

_______________________Applications

Minimum Component Count,

Low-Cost Processor Systems

___________________________Features

o +5V, +3.3V, and +3V Versions

o No External Components

o Low Cost

o Precise Power-Down Reset Threshold

o 140ms Min Power-On Reset Delay

o Immune to Short Negative V

o 8-Pin DIP, µMAX, and SO Packages

o Low Supply Current: 35µA - MAX709R/S/T

65µA - MAX709L/M

______________Ordering Information

PART

TEMP. RANGE

PIN-PACKAGE

MAX709_CPA

0°C to +70°C

MAX709_CSA

0°C to +70°C

8 SO

MAX709_C/D

0°C to +70°C

Dice

MAX709_EPA

-40°C to +85°C

8 Plastic DIP

MAX709_ESA

-40°C to +85°C

8 SO

8 Plastic DIP

Note: This part offers a choice of five different reset threshold

voltages. Select the letter corresponding to the desired

nominal reset threshold voltage, and insert it into the

blank to complete the part number.

RESET THRESHOLD

SUFFIX

VOLTAGE (V)

L

4.65

M

4.40

T

3.08

S

2.93

R

2.63

MAX709_CUA

0°C to +70°C

8 µMAX

MAX709_EUA

-40°C to +85°C

8 µMAX