Details, datasheet, quote on part number: MC14578D
DescriptionMC14578 Micro-power Comparator Plus Voltage Follower
CompanyMotorola Semiconductor Products
DatasheetDownload MC14578D datasheet
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Features, Applications

The 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. 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.

Applications: Pulse Shapers Threshold Detectors Low­Battery Detectors Operating Temperature Range: Input Current (IN + Pin):

Line­Powered Smoke Detectors Liquid/Moisture Sensors CO Detector and Micro Interface
Electrostatic Discharge (ESD) Protection Circuitry on All Pins
Motorola Sensor Device Data İ Motorola, Inc. 2000

Symbol VDD Vin Vout Iin Iout IDD PD Tstg TL DC Supply Voltage DC Input Voltage DC Output Voltage DC Input Current, Except + DC Input Current, + DC Output Current, per Pin DC Supply Current, VDD and VSS Pins Power Dissipation, per Package Storage Temperature Lead Temperature (10­Second Soldering) Parameter

*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 SS or VDD). Unused outputs must be left open.

ELECTRICAL CHARACTERISTICS (Voltages Referenced to VSS, Rbias M to VDD, to 70°C Unless Otherwise Indicated)

Symbol VDD VIL Parameter Power Supply Voltage Range Maximum Low­Level Input Voltage, MOSFETs Wired as Inverters; i.e., IN A tied IN B, OUT A to OUT B, OUT C1 to OUT C2. Minimum High­Level Input Voltage, MOSFETs Wired as Inverters; i.e., IN A tied IN B, OUT A to OUT B, OUT C1 to OUT C2. Comparator Input Offset Voltage Vout 9.0 V, |Iout| Test Condition VDD V 10.0 Guaranteed Limit 14.0 2.0 Unit V

= 25°C, Over Common Mode Range to 50°C, Over Common Mode Range

Comparator Common Mode Voltage Range Maximum Low­Level Comparator Output Voltage Minimum High­Level Comparator Output Voltage Buffer Amp Output Offset Voltage Maximum Low­Level Output Voltage, MOSFETs Wired as Inverters Inverters; i.e., IN A tied B, B OUT A to OUT B, OUT C1 to OUT C2. Minimum High­Level Output Voltage, MOSFETs Wired as Inverters Inverters; i.e., IN A tied B, B OUT A to OUT B, OUT C1 to OUT C2. Maximum Input Leakage Current IN + (DIP Only) IN + (DIP Only) IN + (SOG), C, IN Vin = VSS, IN Iout µA IN Vin = VDD, IN Iout 30 µA

Rload M to VDD or VSS, Over Common Mode Range OUT C1, OUT C2: Iout 1.1 mA OUT A, OUT B: Iout 270 µA OUT C1, OUT C2: Iout =

OUT A, OUT B: Iout 25°C, 40% R.H., Vin = VSS or VDD = 50°C, Vin = VSS or VDD Vin = VSS or VDD IN C: Vin = VDD, OUT A, OUT C2: Vout = VSS or VDD IN C: Vin = VSS, OUT B, OUT C1: Vout = VSS or VDD


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