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MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC14578/D MC14578 CMOS Micro-Power Comparator plus Voltage Follower 16 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. 1 P SUFFIX PLASTIC DIP CASE 648­08 " ORDERING INFORMATION MC14578P PLASTIC DIP · Applications: Pulse Shapers Threshold Detectors Low­Battery Detectors · Operating Temperature Range: · Input Current (IN + Pin): PIN ASSIGNMENT Line­Powered Smoke Detectors Liquid/Moisture Sensors CO Detector and Micro Interface VDD COMP OUT IN A IN B OUT A OUT B IN C OUT C1 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 NC IN + NC BUFF OUT IN-- Rbias VSS OUT C2 · Operating Voltage Range: 3.5 to 14 V · Quiescent Current: 10 µA @ 25°C *30° to 70°C "1 pA @ 25°C (DIP Only) · Electrostatic Discharge (ESD) Protection Circuitry on All Pins LOGIC DETAIL IN+ IN 15 12 * + COMP ­ 2 COMP OUT 3 IN A 5 OUT A IN C OUT B 9 7 8 OUT C2 OUT C1 Rbias 11 BIAS CKT + BUFF ­ 4 6 13 IN B BUFF OUT PIN 1 = VDD PIN 10 = VSS PINS 14, 16 = NO CONNECTION REV 1 Motorola Sensor Device Data © Motorola, Inc. 2000 1 MC14578 MAXIMUM RATINGS* (Voltages Referenced to VSS) Symbol VDD Vin Vout Iin Iin Iout IDD PD Tstg TL DC Supply Voltage DC Input Voltage DC Output Voltage DC Input Current, Except IN + DC Input Current, IN + DC Output Current, per Pin DC Supply Current, VDD and VSS Pins Power Dissipation, per Package Storage Temperature Lead Temperature (10­Second Soldering) Parameter *0.5 to VDD +0.5 *0.5 to VDD +0.5 "10 "1.0 "25 "50 *65 to +150 260 500 *0.5 to +14 Value Unit V V V mA mA mA mA mW °C °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 V SS or VDD). Unused outputs must be left open. 2 Motorola Sensor Device Data MC14578 ELECTRICAL CHARACTERISTICS (Voltages Referenced to VSS, Rbias = 3.9 M to VDD, TA = ­30° to 70°C Unless Otherwise Indicated) Symbol VDD VIL Parameter Power Supply Voltage Range Maximum Low­Level Input