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MFG:MC/TC/CD D/C:DIP
Part Number: MC14578
MFG: MC/TC/CD
D/C: DIP
Description: The MC14578 is an analog building block consisting of a veryhigh input impedance comparator. The volta...
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MC14578
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DataSheet
General Description
MC14578 General Description
The MC14578 is an analog building block consisting of a veryhigh input impedance comparator. The voltage follower allows monitoring the noninverting input of the comparator without loading.
Four enhancementmode MOSFETs are also included on chip. These FETs can be externally configured as opendrain or totempole outputs. The drains have onchip staticprotecting diodes. Therefore, the output voltage must be maintained between VSS and VDD.
The chip requires one external component. A 3.9 M ±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.
MC14578 Maximum Ratings
|
Symbol |
Parameter |
Value |
Unit |
|
VDD |
DC Supply Voltage |
-0.5 to +14 |
V |
|
Vin |
DC Input Voltage |
0.5 to VDD +0.5 |
V |
|
Vout |
DC Output Voltage |
0.5 to VDD +0.5 |
V |
|
Iin |
DC Input Current, Except IN + |
±10 |
mA |
|
Iin |
DC Input Current, IN + |
±1.0 |
mA |
|
Iout |
DC Output Current, per Pin |
± 25 |
mA |
|
IDD |
DC Supply Current, VDD and VSS Pins |
±50 |
mA |
|
PD |
Power Dissipation, per Package |
500 |
mW |
|
Tstg |
Storage Temperature |
65 to 150 |
°C |
|
TL |
Lead Temperature (10Second Soldering) |
260 |
°C |
*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 highimpedance 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 Typical Application
• Applications:
Pulse Shapers LinePowered Smoke Detectors
Threshold Detectors Liquid/Moisture Sensors
LowBattery 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 mA @ 25°C
• Electrostatic Discharge (ESD) Protection Circuitry on All Pins
Pulse Shapers LinePowered Smoke Detectors
Threshold Detectors Liquid/Moisture Sensors
LowBattery 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 mA @ 25°C
• Electrostatic Discharge (ESD) Protection Circuitry on All Pins
MC14578 Connection Diagram
MC14578
PDF/DataSheet Download
- Datasheet: MC14578
- File Size: 121021 KB
- Manufacturer: Motorola
- Click here to Download
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