MC34064

MC33064

SEMICONDUCTOR

TECHNICAL DATA

UNDERVOLTAGE

SENSING CIRCUIT

ORDERING INFORMATION

Order this document by MC34064/D

Device

Operating

Temperature Range

Package

MC34064D–5

TA = 0° to +70°C

TA = – 40° to +85°C

SO–8

MC34064P–5

TO–226AA

MC33064DM–5

Micro–8

MC33064P–5

TO–226AA

P SUFFIX

PLASTIC PACKAGE

CASE 29

(TO–226AA)

1

2

D SUFFIX

PLASTIC PACKAGE

CASE 751

(SO–8)

3

Pin 1. Reset

2. Input

3. Ground

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

DM SUFFIX

PLASTIC PACKAGE

CASE 846A

(Micro–8)

8

1

MC34064DM–5

Micro–8

MC33064D–5

SO–8

1

MOTOROLA ANALOG IC DEVICE DATA

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. These devices are packaged in 3-pin

TO-226AA, 8-pin SO–8 and Micro–8 surface mount packages.

Applications include direct monitoring of the 5.0 V MPU/logic power

supply used in appliance, automotive, consumer and industrial equipment.

Representative Block Diagram

1.2 Vref

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–226AA package.

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

This device contains 21 active transistors.

© Motorola, Inc. 1996

Rev 2