MPXM2102AS datasheet(607/670 Pages) MOTOROLA

607 / 670 page

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Motorola Sensor Device Data

www.motorola.com/semiconductors

CMOS

Micro-Power Comparator plus

Voltage Follower

The MC14578 is an analog building block consisting of a very–high input

impedance comparator. The voltage follower allows monitoring the noninverting

input of the comparator without loading.

Four enhancement–mode MOSFETs are also included on chip. These FETs can

be externally configured as open–drain or totem–pole outputs. The drains have

on–chip static–protecting diodes. Therefore, the output voltage must be main-

tained between VSS and VDD.

The chip requires one external component. A 3.9 M

Ω "10% resistor must be

connected from the Rbias pin to VDD. This circuit is designed to operate in smoke

detector systems that comply with UL217 and UL268 specifications.

• Applications:

Pulse Shapers

Line–Powered Smoke Detectors

Threshold Detectors

Liquid/Moisture Sensors

Low–Battery Detectors

CO Detector and Micro Interface

• Operating Voltage Range: 3.5 to 14 V

• Operating Temperature Range: *30° to 70°C

• Input Current (IN + Pin): "1 pA @ 25°C (DIP Only)

• Quiescent Current: 10 µA @ 25°C

• Electrostatic Discharge (ESD) Protection Circuitry on All Pins

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

MC14578

P SUFFIX

PLASTIC DIP

CASE 648–08

PIN ASSIGNMENT

COMP OUT

IN A

IN B

VDD

OUT B

IN C

OUT C1

IN +

BUFF OUT

IN—

Rbias

VSS

OUT C2

ORDERING INFORMATION

MC14578P

PLASTIC DIP

OUT A

LOGIC DETAIL

–

COMP

BIAS

CKT

–

BUFF

COMP OUT

BUFF OUT

IN+

Rbias

IN A

IN B

OUT A

OUT B

OUT C2

OUT C1

IN C

PIN 1 = VDD

PIN 10 = VSS

PINS 14, 16 = NO CONNECTION

REV 1

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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