MC14578 Datasheet, PDF (1/8 Pages) Freescale Semiconductor, Inc – CMOS Micro-Power Comparator plus Voltage Follower

Freescale Semiconductor
Technical Data
MC14578
Rev 2, 05/2005
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
maintained between V_SS and V_DD.
The chip requires one external component. A 3.9 MΩ ±10% resistor must be
connected from the R_bias pin to V_DD. This circuit is designed to operate in smoke
detector systems that comply with UL217 and UL268 specifications.
Features
• Applications:
Pulse Shapers
Threshold Detectors
Low-Battery Detectors
Line-Powered Smoke Detectors
Liquid/Moisture Sensors
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
Device
MC14578P
ORDERING INFORMATION
Temperature
Range
Case No.
-30° to 70°C
648-08
Package
Plastic Dip
MC14578
CMOS
MICRO-POWER COMPARATOR
PLUS VOLTAGE FOLLOWER
P SUFFIX
PLASTIC DIP
CASE 648-08
V_DD 1
Comp OUT 2
IN A 3
IN B 4
OUT A 5
OUT B ₆
IN C 7
OUT C1 8
16 NC
15 IN +
14 NC
13 Buff OUT
12 IN–
11 R_bias
10 V_SS
9 OUT C2
Figure 1. Pin Connections
© Freescale Semiconductor, Inc., 2005. All rights reserved.