OF

1

Copyright

© 1999

Rev. 1.3a,2005-03-01

MC33064 / MC34064

DESCRI PTI O N

The MC34064 is an undervoltage sensing

circuit designed specifically for use as a

reset controller in microprocessor- based

systems.

It

offers

the

designer

an

economical, space-efficient solution for low

supply voltage detection when used in

combination with a single pullup resistor.

Adding

one

capacitor

offers

the

functionality of a programmable delay time

after power returns. The 34064 consists of a

temperature stable reference comparator

with

hysteresis,

high-current

clamping

diode and open

collector output stage capable of sinking

up to 60mA. The MC34064's RESET

output is specified to be fully functional at

VIN=1V. A major improvement over

competing

products is the glitch-free

supply

current

during

undervoltage

detection. Competing products demand a

step function increase in operating current

during the time that you least want or need

it:

during

power

loss.

See

Product

Highlight below.

IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com

PRODUCT H I GHLIGHT

KEY FEATUR ES

Monitors 5V Supplies (VT =

4.6V Typ.)

Outputs Fully Defined At VIN

= 1V (See Figure 1)

Glitch-Free Supply Current

During Switching (See

Product Highlight)

Ultra-Low Supply Current

(500µA Max.)

Temperature Compensated

ICC For Extremely Stable

Current Consumption

µP Reset Function

Programmable With 1

External Resistor And

Capacitor

Comparator Hysteresis

Prevents Output Oscillation

Electrically Compatible With

Motorola MC34064

Pin-to-Pin Compatible With

Motorola MC34064 /

MC34164

KEY FEATUR ES

All Microprocessor Or

Microcontroller Designs

Using 5V Supplies

Simple 5V Undervoltage

Detection

PACKAGE ORDER INFO

DM

Plastic SOIC

8-Pin

LP

Plastic TO-92

3-Pin

PK

Plastic SOT-89

3-Pin

°C)

RoHS / Pb-free

Transition DC: 0440

RoHS / Pb-free

Transition DC: 0509

RoHS / Pb-free

Transition DC: 0518

0 to 70

MC34064DM

MC34064LP

MC34064PK

-40 to 85

MC33064DM

MC33064LP

MC33064PK

Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. MC34064DM-TR)