MC14578

Rev 2, 05/2005

Freescale Semiconductor

Technical Data

© Freescale Semiconductor, Inc., 2005. All rights reserved.

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

The chip requires one external component. A 3.9 M

Ω ±10% resistor must be

detector systems that comply with UL217 and UL268 specifications.

Features

•

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

ORDERING INFORMATION

Device

Temperature

Range

Case No.

Package

MC14578P

-30

° to 70°C

648-08

Plastic Dip

MC14578

CMOS

MICRO-POWER COMPARATOR

PLUS VOLTAGE FOLLOWER

P SUFFIX

PLASTIC DIP

CASE 648-08

8

10

9

1

2

3

4

5

6

7

16

15

14

13

12

11

Comp OUT

IN A

IN B

OUT A

OUT B

IN C

OUT C1

NC

IN +

NC

Buff OUT

IN–

OUT C2

Figure 1. Pin Connections