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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 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 M 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.
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P SUFFIX PLASTIC DIP CASE 648-08
"10%
ORDERING INFORMATION MC14578P PLASTIC DIP
* Applications: Pulse Shapers Threshold Detectors Low-Battery Detectors * Operating Temperature Range: * Input Current (IN + Pin):
PIN ASSIGNMENT
Line-Powered 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 A @ 25C
*30 to 70C "1 pA @ 25C (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
Motorola Sensor Device Data (c) 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 (10-Second Soldering) Parameter
*0.5 to +14 *0.5 to VDD +0.5 *0.5 to VDD +0.5 "10 "1.0 "25 "50 *65 to +150
260 500
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 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.
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Motorola Sensor Device Data
MC14578
ELECTRICAL CHARACTERISTICS (Voltages Referenced to VSS, Rbias = 3.9 M to VDD, TA = -30 to 70C Unless Otherwise Indicated)
Symbol VDD VIL Parameter Power Supply Voltage Range 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. 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. Comparator Input Offset Voltage Vout = 9.0 V, |Iout| Test Condition VDD V -- 10.0 Guaranteed Limit 3.5 to 14.0 2.0 Unit V V
t1 A t1 A
VIH
Vout = 1.0 V, |Iout|
10.0
8.0
V
VIO
TA = 25C, Over Common Mode Range TA = 0 to 50C, Over Common Mode Range
10.0 3.5 to 14.0 3.5 to 14.0 10.0 10.0 -- 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0
"50 "75
0.7 to VDD 0.5 9.5
mV
VCM VOL VOH VOO VOL
Comparator Common Mode Voltage Range Maximum Low-Level Comparator Output Voltage Minimum High-Level Comparator Output Voltage Buffer Amp Output Offset Voltage Maximum Low-Level Output Voltage, MOSFETs Wired as Inverters i e IN A tied to IN B, OUT Inverters; i.e., B A to OUT B, OUT C1 to OUT C2. Minimum High-Level Output Voltage, MOSFETs Wired as Inverters i e IN A tied to IN B, OUT Inverters; i.e., B A to OUT B, OUT C1 to OUT C2. Maximum Input Leakage Current IN + (DIP Only) IN + (DIP Only) IN + (SOG), IN A, IN B, IN C, IN* IN +: Vin = VSS, IN Iout = 30 A IN +: Vin = VDD, IN Iout = A
*: Vin = VDD, *: Vin = VSS,
*1.5
V V V mV V V V V pA
*30
Rload = 10 M to VDD or VSS, Over Common Mode Range OUT C1, OUT C2: Iout = 1.1 mA OUT A, OUT B: Iout = 270 A OUT C1, OUT C2: Iout =
"100
0.5 0.5 9.5 9.5
VOH
*1.1 mA
OUT A, OUT B: Iout = 270 A TA = 25C, 40% R.H., Vin = VSS or VDD TA = 50C, Vin = VSS or VDD Vin = VSS or VDD IN A, IN C: Vin = VDD, OUT A, OUT C2: Vout = VSS or VDD IN B, IN C: Vin = VSS, OUT B, OUT C1: Vout = VSS or VDD
Iin
"1.0 "6.0 "40 "100 "100
10
nA nA
IOZ
Maximum Off-State MOSFET Leakage Current
10.0
IDD
Maximum Quiescent Current
TA = 25C IN A, IN B, IN C: Vin = VSS or VDD, |VIN + IN*| = 100 mV, Iout = 0 A
10.0
A
*V
Cin
Maximum Input Capacitance
IN + Other Inputs
f = 1 kHz
-- --
5.0 15
pF
Motorola Sensor Device Data
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MC14578
APPLICATIONS INFORMATION
V+ V+
1
VDD
MC14578
NC
16
R1 V+
2
COMP OUT
IN +
15
3
IN A
NC
14
R3 R2
4 R5 6.8 k LOW-BATTERY INDICATOR
IN B
BUFF OUT
13
5
OUT A
IN
*
12
V+
D1
D2
6
OUT B
Rbias
11
R4 3.9 M
7
IN C
VSS
10
8
OUT C1
OUT C2
9
OUTPUT
HIGH = BATTERY LOW LOW = BATTERY OK
NOTE: IN + and IN
* have very high input impedance. Interconnect to these pins should be as short as possible.
Figure 1. Low-Battery Detector
EXAMPLE VALUES
Near the switchpoint, the comparator output in the circuit of Figure 1 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 2. The circuit of Figure 2 requires slightly more operating current than the Figure 1 arrangement.
R1 470 k 820 k 1.2 M
R2 1.3 M 1.2 M 1.2 M
R3 20 k 39 k 62 k
Nominal Trip Point 4.08 V 5.05 V 6.00 V
12 15
- + R6
2
R7
Figure 2. Adding Hysteresis
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Motorola Sensor Device Data
MC14578
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. 9 DIM A B C D F G H J K L M S INCHES MIN MAX 0.740 0.770 0.250 0.270 0.145 0.175 0.015 0.021 0.040 0.70 0.100 BSC 0.050 BSC 0.008 0.015 0.110 0.130 0.295 0.305 0_ 10 _ 0.020 0.040 MILLIMETERS MIN MAX 18.80 19.55 6.35 6.85 3.69 4.44 0.39 0.53 1.02 1.77 2.54 BSC 1.27 BSC 0.21 0.38 2.80 3.30 7.50 7.74 0_ 10 _ 0.51 1.01
-A-
16
B
1 8
F S
C
L
-T- H G D
16 PL
SEATING PLANE
K
J TA
M
M
0.25 (0.010)
M
CASE 648-08 ISSUE R
STYLE 1: PIN 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16.
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.
COMMON DRAIN COMMON DRAIN COMMON DRAIN COMMON DRAIN COMMON DRAIN COMMON DRAIN COMMON DRAIN COMMON DRAIN GATE SOURCE GATE SOURCE GATE SOURCE GATE SOURCE
Motorola Sensor Device Data
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MC14578
NOTES
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Motorola Sensor Device Data
MC14578
NOTES
Motorola Sensor Device Data
7
MC14578
Mfax is a trademark of Motorola, Inc.
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola 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 which may be provided in Motorola 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. Motorola does not convey any license under its patent rights nor the rights of others. Motorola 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 Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola 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 Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer.
How to reach us: USA/EUROPE/Locations Not Listed: Motorola Literature Distribution; P.O. Box 5405, Denver, Colorado 80217. 1-303-675-2140 or 1-800-441-2447 JAPAN: Motorola Japan Ltd.; SPS, Technical Information Center, 3-20-1, Minami-Azabu. Minato-ku, Tokyo 106-8573 Japan. 81-3-3440-3569 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; Silicon Harbour Centre, 2 Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong. 852-26668334 Customer Focus Center: 1-800-521-6274 MfaxTM: RMFAX0@email.sps.mot.com - TOUCHTONE 1-602-244-6609 Motorola Fax Back System - US & Canada ONLY 1-800-774-1848 - http://sps.motorola.com/mfax/ HOME PAGE: http://motorola.com/sps/
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Motorola Sensor Device Data
MC14578/D

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