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Freescale Semiconductor Electronic Components Datasheet

MC14578 Datasheet

CMOS Micro-Power Comparator plus Voltage Follower

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MC14578 pdf
Archived by Freescale Semiconductor, Inc., 2009
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 VSS and VDD.
The chip requires one external component. A 3.9 MΩ ±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.
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
VDD
Comp OUT
IN A
IN B
OUT A
OUT B
IN C
OUT C1
1
2
3
4
5
6
7
8
16 NC
15 IN +
14 NC
13 Buff OUT
12 IN–
11 Rbias
10 VSS
9 OUT C2
Figure 1. Pin Connections
© Freescale Semiconductor, Inc., 2005. All rights reserved.


Freescale Semiconductor Electronic Components Datasheet

MC14578 Datasheet

CMOS Micro-Power Comparator plus Voltage Follower

No Preview Available !

MC14578 pdf
Archived by Freescale Semiconductor, Inc., 2009
IN + 15
IN – 12
Rbias 11
+
Comp
Bias
Ckt
+
Buff
2 Comp OUT
IN A 3
5 OUT A IN C 7
6 OUT B
13 Buff OUT
IN B 4
Figure 2. Block Diagram
Pin 1 = VDD
Pin 10 = VSS
Pin 14, 16 = No Connection
9 OUT C2
8 OUT C1
Table 1. Maximum Ratings(1)
(Voltages Referenced to VSS)
Rating
Symbol
Value
Unit
DC Supply Voltage
DC Input Voltage
DC Output Voltage
DC Input Current, Except IN +
DC Output Current, IN +
DC Output Current, per Pin
DC Supply Current, VDD and VSS Pins
Power Dissipation, per Package
Storage Temperature
Lead Temperature (10-Second Soldering)
VDD
-0.5 to +14
V
Vin
-0.5 to VDD +0.5
V
Vout
-0.5 to VDD +0.5
V
Iin ±10 mA
Iin ±1.0 mA
Iout ±25 mA
IDD ±50 mA
PD 500 mW
Tstg
-65 to + 150
°C
TL 260 °C
1. Maximum Ratings are those values beyond which damage to the device may occur. This device contains protection circuitry to guard against
damage due to high static voltages or electric fields. However, precautions must be taken to avoid applications of any voltage higher than
maximum rated voltages to this high-impedance circuit. For proper operation, Vin and Vout should be constrained to the range VSS (Vin or
Vout) VDD. Unused inputs must always be tied to an appropriate logic voltage level (e.g., either VSS or VDD). Unused outputs must be left
open.
MC14578
2
Sensors
Freescale Semiconductor


Part Number MC14578
Description CMOS Micro-Power Comparator plus Voltage Follower
Maker Freescale Semiconductor
Total Page 8 Pages
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