© Semiconductor Components Industries, LLC, 2005

February, 2005 − Rev. 12

1

Publication Order Number:

MC34064/D

MC34064, MC33064,

NCV33064

Undervoltage Sensing

Circuit

The MC34064 is an undervoltage sensing circuit specifically

designed for use as a reset controller in microprocessor−based

systems. It offers the designer an economical solution for low voltage

detection with a single external resistor. The MC34064 features a

trimmed−in−package bandgap reference, and a comparator with

precise thresholds and built-in hysteresis to prevent erratic reset

operation. The open collector reset output is capable of sinking in

excess of 10 mA, and operation is guaranteed down to 1.0 V input with

low standby current. The MC devices are packaged in 3−pin TO-92,

micro size TSOP−5, 8−pin SOIC−8 and Micro8

t surface mount

packages. The NCV device is packaged in SOIC−8 and TO−92.

Applications include direct monitoring of the 5.0 V MPU/logic

power supply used in appliance, automotive, consumer and industrial

equipment.

Features

Packages

and Control Changes

2 (2)

1 (1)

3 (4)

Reset

GND

Input

=

Sink Only

Positive True Logic

Pin numbers adjacent to terminals are for the 3−pin TO−92 package.

Pin numbers in parenthesis are for the 8−lead packages.

This device contains 21 active transistors.

Figure 1. Representative Block Diagram

http://onsemi.com

1

2

3

Pin 1. Reset

2. Input

3. Ground

TO−92

P SUFFIX

CASE 29

8

1

(Top View)

3

1

N.C.

Ground

N.C.

N.C.

2

4

8

7

6

5

N.C.

N.C.

Input

Reset

8

1

PIN CONNECTIONS

ORDERING INFORMATION

SOIC−8

D SUFFIX

CASE 751

Micro8

DM SUFFIX

CASE 846A

TSOP−5

SN SUFFIX

CASE 483

1

5

Pin 1. Reset

2. Input

3. Ground

4. NC

5. NC

See detailed ordering and shipping information in the package

dimensions section on page 6 of this data sheet.

See general marking information in the device marking

section on page 7 of this data sheet.

DEVICE MARKING INFORMATION