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. 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 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 Table 2. Electrical Characteristics (Voltages Referenced to VSS, Rbias = 3.9 MΩ to VDD, TA = -30° to 70°C Unless Otherwise Indicated) 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 <1 µA 10.0 2.0 V Minimum High-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 VIH Vout = 1.0 V, IIoutI <1 µA 10.0 8.0 V Comparator Input Offset Voltage VIO TA = 25°C, Over Common Mode Range 10.0 ±50 mV TA = 0° to 50°C, Over Common Mode Range 3.5 to 14.0 ±75 3.5 to 14.0 0.7 to VDD – 1.5 V Comparator Common Mode Voltage Range VCM Maximum Low-Level Comparator Output Voltage VOL IN +: Vin = VSS, IN –: Vin = VDD, Iout = 30 µA 10.0 0.5 V Minimum High-Level Comparator Output Voltage VOH IN +: Vin = VDD, IN –: Vin= VSS, Iout = -30 µA 10.0 9.5 V Buffer Amp Output Offset Voltage VOO Rload = 10 MΩ to VDD or VSS, Over Common Mode Range — ±100 mV 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 VOL OUT C1, OUT C2, Iout = 1.1 mA 10.0 0.5 V OUT A, OUT B, Iout = 270 µA 10.0 0.5 V Minimum High-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 VOH OUT C1, OUT C2, Iout = -1.1 mA 10.0 9.5 V OUT A, OUT B, Iout = 270 µA 10.0 9.5 V TA = 25°C, 40% R.H., Vin = VSS or VDD 10.0 ±1.0 pA IN + (DIP Only) TA = 50°C, Vin = VSS or VDD 10.0 ±6.0 IN + (SOG), IN A, IN B, IN C, IN – Vin = VSS or VDD 10.0 ±40 nA IN A, IN C: Vin = VDD, OUT A, OUT C2: Vout = VSS or VDD 10.0 ±100 nA IN B, IN C: Vin = VSS, OUT B, OUT C1: Vout = VSS or VDD 10.0 ±100 IDD TA = 25°C IN A, IN B, IN C: Vin = VSS or VDD, IVIN + – VIN – I = 100 mV Iout = 0 µA 10.0 10 µA Cin f = 1 kHz — — 5.0 15 pF Maximum Input Leakage Current IN + (DIP Only) Maximum Off-State MOSFET Leakage Current Maximum Quiescent Current Maximum Input Capacitance IN + Other Inputs Iin IOZ MC14578 Sensors Freescale Semiconductor 3 APPLICATIONS INFORMATION V+ V+ MC14578 1 2 3 4 R5 5 VDD NC COMP OUT IN + IN A NC 16 15 14 R2 BUFF OUT 13 OUT A IN – 12 OUT B RBIAS IN B R1 D2 6 7 8 IN C OUT C1 VSS OUT C2 D1 V+ 6.8 k Low-battery Indicator R3 R4 11 3.9 M 10 9 High = Battery Low Low = Battery Ok OUTPUT NOTE: IN + and IN – have very high input impedance. Interconnect to these pins should be as short as possible. Figure 3. Low-Battery Detector EXAMPLE VALUES Near the switchpoint, the comparator output in the circuit of Figure 3. may chatter or oscillate. This oscillation appears on the signal labelled OUTPUT. In some cases, the oscillation in the transition region will not cause problems. For example, an MPU reading OUTPUT could sample the signal two or three times to ensure a solid level is attained. But, in a low battery detector, this probably is not necessary. To eliminate comparator chatter, hysteresis can be added as shown in Figure 4.. The circuit of Figure 4. requires slightly more operating current than the Figure 3. arrangement. R1 R2 R3 Nominal Tip Point 470 kΩ 1.3 MΩ 20 kΩ 4.08 V 820 kΩ 1.2 MΩ 39 kΩ 5.05 V 1.2 MΩ 1.2 MΩ 62 kΩ 6.00 V 12 2 R6 15 R7 Figure 4. Adding Hysteresis MC14578 4 Sensors Freescale Semiconductor PACKAGE DIMENSIONS NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION L TO CENTER OF LEADS WHEN FORMED PARALLEL. 4. DIMENSION B DOES NOT INCLUDE MOLD FLASH. 5. ROUNDED CORNERS OPTIONAL. -A16 9 1 8 B F C L S SEATING PLANE -TK H G D M J 16 PL 0.25 (0.010) M T A STYLE 1: PIN 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. M CATHODE CATHODE CATHODE CATHODE CATHODE CATHODE CATHODE CATHODE ANODE ANODE ANODE ANODE ANODE ANODE ANODE ANODE STYLE 2: PIN 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. DIM A B C D F G H J K L M S INCHES MILLIMETERS MIN MAX MIN MAX 0.740 0.770 18.80 19.55 0.250 0.270 6.35 6.85 0.145 0.175 3.69 4.44 0.015 0.021 0.39 0.53 0.040 0.70 1.02 1.77 0.100 BSC 2.54 BSC 0.050 BSC 1.27 BSC 0.008 0.015 0.21 0.38 0.110 0.130 2.80 3.30 0.295 0.305 7.50 7.74 0 10 0 10 0.020 0.040 0.51 1.01 COMMON DRAIN COMMON DRAIN COMMON DRAIN COMMON DRAIN COMMON DRAIN COMMON DRAIN COMMON DRAIN COMMON DRAIN GATE SOURCE GATE SOURCE GATE SOURCE GATE SOURCE CASE 648-08 ISSUE R 16-LEAD PLASTIC DIP MC14578 Sensors Freescale Semiconductor 5 NOTES MC14578 6 Sensors Freescale Semiconductor NOTES MC14578 Sensors Freescale Semiconductor 7 How to Reach Us: Home Page: www.freescale.com E-mail: [email protected] USA/Europe or Locations Not Listed: Freescale Semiconductor Technical Information Center, CH370 1300 N. Alma School Road Chandler, Arizona 85224 +1-800-521-6274 or +1-480-768-2130 [email protected] Europe, Middle East, and Africa: Freescale Halbleiter Deutschland GmbH Technical Information Center Schatzbogen 7 81829 Muenchen, Germany +44 1296 380 456 (English) +46 8 52200080 (English) +49 89 92103 559 (German) +33 1 69 35 48 48 (French) [email protected] Japan: Freescale Semiconductor Japan Ltd. Headquarters ARCO Tower 15F 1-8-1, Shimo-Meguro, Meguro-ku, Tokyo 153-0064 Japan 0120 191014 or +81 3 5437 9125 [email protected] Asia/Pacific: Freescale Semiconductor Hong Kong Ltd. Technical Information Center 2 Dai King Street Tai Po Industrial Estate Tai Po, N.T., Hong Kong +800 2666 8080 [email protected] For Literature Requests Only: Freescale Semiconductor Literature Distribution Center P.O. Box 5405 Denver, Colorado 80217 1-800-441-2447 or 303-675-2140 Fax: 303-675-2150 [email protected] MC14578 Rev. 2 05/2005 Information in this document is provided solely to enable system and software implementers to use Freescale Semiconductor products. There are no express or implied copyright licenses granted hereunder to design or fabricate any integrated circuits or integrated circuits based on the information in this document. Freescale Semiconductor reserves the right to make changes without further notice to any products herein. Freescale Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Freescale Semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters that may be provided in Freescale Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals”, must be validated for each customer application by customer’s technical experts. Freescale Semiconductor does not convey any license under its patent rights nor the rights of others. Freescale Semiconductor products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Freescale Semiconductor product could create a situation where personal injury or death may occur. Should Buyer purchase or use Freescale Semiconductor products for any such unintended or unauthorized application, Buyer shall indemnify and hold Freescale Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Freescale Semiconductor was negligent regarding the design or manufacture of the part. Freescale™ and the Freescale logo are trademarks of Freescale Semiconductor, Inc. All other product or service names are the property of their respective owners. © Freescale Semiconductor, Inc. 2005. All rights reserved.