MC14578P

Archived by Freescale Semiconductor, Inc., 2009 Freescale Semiconductor Technical Data MC14578 Rev 2, 05/2005 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. MC14578 CMOS MICRO-POWER COMPARATOR PLUS VOLTAGE FOLLOWER Features • • • • • • Applications: Pulse Shapers Line-Powered Smoke Detectors Threshold Detectors Liquid/Moisture Sensors Low-Battery 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 μA @ 25°C Electrostatic Discharge (ESD) Protection Circuitry on All Pins ORDERING INFORMATION Device Temperature Range Case No. Package MC14578P -30° to 70°C 648-08 Plastic Dip © Freescale Semiconductor, Inc., 2005. All rights reserved. P SUFFIX PLASTIC DIP CASE 648-08 VDD 1 16 NC Comp OUT 2 15 IN + IN A 3 14 NC IN B 4 13 Buff OUT OUT A OUT B 5 12 IN– 6 11 Rbias IN C 7 10 OUT C1 8 9 VSS OUT C2 Figure 1. Pin Connections Archive Information Archive Information CMOS Micro-Power Comparator plus Voltage Follower Archived by Freescale Semiconductor, Inc., 2009 IN + 15 IN – 12 + 2 Comp Comp OUT IN A 3 – 5 Rbias 11 Bias Ckt OUT A 6 + 13 Buff Buff OUT IN B 9 OUT C2 IN C 7 OUT B 8 OUT C1 4 Pin 1 = VDD Pin 10 = VSS Pin 14, 16 = No Connection Figure 2. Block Diagram Table 1. Maximum Ratings(1) (Voltages Referenced to VSS) Symbol Value Unit DC Supply Voltage Rating VDD -0.5 to +14 V DC Input Voltage Vin -0.5 to VDD +0.5 V DC Output Voltage Vout -0.5 to VDD +0.5 V DC Input Current, Except IN + Iin ±10 mA DC Output Current, IN + Iin ±1.0 mA DC Output Current, per Pin Iout ±25 mA DC Supply Current, VDD and VSS Pins IDD ±50 mA Power Dissipation, per Package PD 500 mW Storage Temperature Tstg -65 to + 150 °C TL 260 °C Lead Temperature (10-Second Soldering) 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 Archive Information Archive Information – Archived by Freescale Semiconductor, Inc., 2009 Archive Information Characteristic Symbol Test Condition VDD VDC Guaranteed Limit Unit — 3.5 to 14.0 V Power Supply Voltage Range VDD Maximum Low-Level Input Voltage, MOSFETs Wired as Inverters; i.e., IN A tied to IN B, OUT A to OUT B, OUT C1 to OUT C2 VIL Vout = 9.0 V, IIoutI