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| Order this document by MC3456/D Dual Timing Circuit The MC3456 dual timing circuit is a highly stable controller capable of producing accurate time delays, or oscillation. Additional terminals are provided for triggering or resetting if desired. In the time delay mode of operation, the time is precisely controlled by one external resistor and capacitor per timer. For astable operation as an oscillator, the free running frequency and the duty cycle are both accurately controlled with two external resistors and one capacitor per timer. The circuit may be triggered and reset on falling waveforms, and the output structure can source or sink up to 200 mA or drive MTTL circuits. * Direct Replacement for NE556/SE556 Timers MC3456 DUAL TIMING CIRCUIT SEMICONDUCTOR TECHNICAL DATA * * * * * * * * Timing from Microseconds through Hours Operates in Both Astable and Monostable Modes Adjustable Duty Cycle High Current Output can Source or Sink 200 mA Output can Drive MTTL Temperature Stability of 0.005% per C Normally "On" or Normally "Off" Output Dual Version of the Popular MC1455 Timer P SUFFIX PLASTIC PACKAGE CASE 646 D SUFFIX PLASTIC PACKAGE CASE 751 (SO-14) PIN CONNECTIONS Discharge A Threshold A 1 2 3 4 5 6 7 14 13 12 11 10 9 8 VCC Discharge B Threshold B Control B Reset B Output B Trigger B Figure 1. 22 Second Solid State Time Delay Relay Circuit 1.0 k MT2 3 10 k 5 0.01 F 4 2 8 1/2 MC3456 1 6 7 1.0 F C -10 V t = 1.1; R and C = 22 sec Time delay (t) is variable by changing R and C (see Figure 16). 1N4740 3.5 k 250 V 1N4003 - 10 F + R 20 M G MT1 Load 117 Vac/60 Hz Control A Reset A Output A Trigger A Gnd 0.1 F (Top View) ORDERING INFORMATION Device MC3456P Operating Temperature Range 0 to +70C Package Plastic DIP SO-14 Figure 3. General Test Circuit VR Reset 5 Control Voltage 3 Output VO ISink ISource Gnd 1 2 6 (8) 4 8 VCC 7 Discharge Threshold 6 Trigger Ith V 2.0 k S 2 (12) Threshold 3 (11) Control Voltage ICC 700 VCC NE556D Figure 2. Block Diagram (1/2 Shown) VCC 14 5k + Comp A - 5k + Comp -B 5k 7 Gnd 4 (10) Reset Flip R Flop Q S Inhibit/ Reset 5 (9) Output 1 (13) Discharge + 0.01 F 1/2 MC3456 Trigger Test circuit for measuring DC parameters (to set output and measure parameters): a) When VS 2/3 VCC, VO is low. b) When VS 1/3 VCC, VO is high. c) When VO is low, Pin 7 sinks current. To test for Reset, set VO high, c) apply Reset voltage, and test for current flowing into Pin 7. When Reset c) is not in use, it should be tied to VCC. w v (c) Motorola, Inc. 1996 Rev 2 MOTOROLA ANALOG IC DEVICE DATA 1 MC3456 MAXIMUM RATINGS (TA = +25C, unless otherwise noted.) Rating Power Supply Voltage Discharge Current Power Dissipation (Package Limitation) P Suffix, Plastic Package, Case 646 Derate above TA = +25C D Suffix, Plastic Package, Case 751 Derate above TA = +25C Operating Ambient Temperature Range Storage Temperature Range Symbol VCC Idis PD 625 5.0 1.0 8.0 TA Tstg mW mW/C W mW/C C C Value +18 200 Unit Vdc mA 0 to +70 -65 to +150 ELECTRICAL CHARACTERISTICS (TA = +25C, VCC = +15 V, unless otherwise noted.) Characteristics Supply Voltage Supply Current VCC = 5.0 V, RL = VCC = 15 V, RL = Low State, (Note 1) Timing Error (Note 2) Monostable Mode (RA = 2.0 k; C = 0.1 F) Initial Accuracy Drift with Temperature Drift with Supply Voltage Astable Mode (RA = RB = 2.0 k to 100 k; C = 0.01 F) Initial Accuracy Drift with Temperature Drift with Supply Voltage Threshold Voltage Trigger Voltage VCC = 15 V VCC = 5.0 V Trigger Current Reset Voltage Reset Current Threshold Current (Note 3) Control Voltage Level VCC = 15 V VCC = 5.0 V Output Voltage Low (VCC = 15 V) ISink = 10 mA ISink = 50 mA ISink = 100 mA ISink = 200 mA (VCC = 5.0 V) ISink = 5.0 mA Output Voltage High (ISource = 200 mA) VCC = 15 V (ISource = 100 mA) VCC = 15 V VCC = 5.0 V Toggle Rate RA = 3.3 k, RB = 6.8 k, C = 0.003 F (Figure 17, 19) Discharge Leakage Current Rise Time of Output Fall Time of Output Matching Characteristics Between Sections Monostable Mode Initial Timing Accuracy Timing Drift with Temperature Drift with Supply Voltage Vth VT - - IT VR IR Ith VCL 9.0 2.6 VOL V - - - - - VOH - 12.75 2.75 - Idis tOLH tOHL - - - - 12.5 13.3 3.3 100 20 100 100 - - - - 100 - - kHz nA ns ns 0.1 0.4 2.0 2.5 0.25 0.25 0.75 2.75 - 0.35 V 10 3.33 11 4.0 - 0.4 - - 5.0 1.67 0.5 0.7 0.1 0.03 - - - 1.0 - 0.1 A V mA A V Symbol VCC ICC - - 6.0 20 12 30 Min 4.5 Typ - Max 16 Unit V mA - - - - - - - 0.75 50 0.1 2.25 150 0.3 2/3 - - - - - - - % PPM/C %/V % PPM/C %/V xVCC V - - - 1.0 10 0.2 2.0 - 0.5 % ppm/C %/V NOTES: 1. Supply current is typically 1.0 mA less for each output which is high. 2. Tested at VCC = 5.0 V and VCC = 15 V. 3. This will determine the maximum value of RA + RB for 15 V operation. The maximum total R = 20 m. 2 MOTOROLA ANALOG IC DEVICE DATA MC3456 Figure 4. Trigger Pulse Width 150 ICC , SUPPLY CURRENT (mA) PW, PULSE WIDTH (ns MIN) 125 100 75 50 25 0 0 0.1 0.2 0.3 0.4 VT (min), MINIMUM TRIGGER VOLTAGE (X VCC = Vdc) 0C 25C 70C 10 25C 8.0 6.0 4.0 2.0 0 5.0 Figure 5. Supply Current 10 VCC, SUPPLY VOLTAGE (Vdc) 15 Figure 7. Low Output Voltage Figure 6. High Output Voltage 2.0 1.8 1.6 VCC -VOH (Vdc) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 1.0 2.0 5.0 10 ISource (mA) 20 50 100 0.01 1.0 2.0 5.0 10 ISink (mA) 20 50 100 5.0 V VCC 15 V 25C 1.0 VOL, (Vdc) 25C 10 (@ VCC = 5.0 Vdc) 0.1 Figure 8. Low Output Voltage (@ VCC = 10 Vdc) 10 10 Figure 9. Low Output Voltage (@ VCC = 15 Vdc) 1.0 VOL, (Vdc) 25C 0.1 VOL, (Vdc) 1.0 25C 0.1 0.01 1.0 2.0 5.0 10 ISink (mA) 20 50 100 0.01 1.0 2.0 5.0 10 ISink (mA) 20 50 100 MOTOROLA ANALOG IC DEVICE DATA 3 MC3456 Figure 10. Delay Time versus Supply Voltage 1.015 t d, DELAY TIME NORMALIZED 1.010 1.005 1.000 0.995 0.990 0.985 0 5.0 10 15 20 VCC, SUPPLY VOLTAGE (Vdc) t d, DELAY TIME NORMALIZED 1.015 1.010 1.005 1.000 0.995 0.990 0.985 - 75 Figure 11. Delay Time versus Temperature - 50 - 25 0 25 50 75 100 125 TA, AMBIENT TEMPERATURE (C) Figure 12. Propagation Delay versus Trigger Voltage 300 t pd , PROPAGATION DELAY TIME (ns) 250 200 150 100 70C 50 0 0 0.1 0.2 0.3 VT (min), MINIMUM TRIGGER VOLTAGE (x VCC = Vdc) 0.4 0C 25C 4 MOTOROLA ANALOG IC DEVICE DATA MC3456 Figure 13. 1/2 Representative Circuit Schematic Control Voltage Threshold Comparator VCC 4.7 k 830 4.7 k 1.0 k 6.8 k Trigger Comparator Flip-Flop Output 5.0 k Threshold 7.0 k 10 k c 5.0 k Trigger Reset Reset Discharge Gnd 100 k Discharge 100 5.0 k 220 4.7 k cb e 4.7 k b 3.9 k Output GENERAL OPERATION The MC3456 is a dual timing circuit which uses as its timing elements an external resistor/capacitor network. It can be used in both the monostable (one shot) and astable modes with frequency and duty cycle, controlled by the capacitor and resistor values. While the timing is dependent upon the external passive components, the monolithic circuit provides the starting circuit, voltage comparison and other functions needed for a complete timing circuit. Internal to the integrated circuit are two comparators, one for the input signal and the other for capacitor voltage; also a flip-flop and digital output are included. The comparator reference voltages are always a fixed ratio of the supply voltage thus providing output timing independent of supply voltage. Monostable Mode In the monostable mode, a capacitor and a single resistor are used for the timing network. Both the threshold terminal and the discharge transistor terminal are connected together in this mode (refer to circuit Figure 15). When the input voltage to the trigger comparator falls below 1/3 VCC the comparator output triggers the flip-flop so that it's output sets low. This turns the capacitor discharge transistor "off" and drives the digital output to the high state. This condition allows the capacitor to charge at an exponential rate which is set by the RC time constant. When the capacitor voltage reaches 2/3 VCC the threshold comparator resets the flip-flop. This action discharges the timing capacitor and returns the digital output to the low state. Once the flip-flop has been triggered by an input signal, it cannot be retriggered until the present timing period has been completed. The time that the output is high is given by the equation t = 1.1 RA C. Various combinations of R and C and their associated times are shown in Figure 14. The trigger pulse width must be less than the timing period. A reset pin is provided to discharge the capacitor thus interrupting the timing cycle. As long as the reset pin is low, the capacitor discharge transistor is turned "on" and prevents the capacitor from charging. While the reset voltage is applied the digital output will remain the same. The reset pin should be tied to the supply voltage when not in use. Figure 14. Time Delay 100 10 C, CAPACITANCE ( F) 1.0 0.1 0.01 0.001 10 s 100 s 1.0 ms 10 ms 100 ms td, TIME DELAY (s) 1.0 10 100 MOTOROLA ANALOG IC DEVICE DATA 5 MC3456 Figure 15. Monostable Circuit +VCC (5.0 V to 15 V) Figure 16. Monostable Waveforms RL Reset 4 (10) 5 (9) Output 1/2 VCC 14 Discharge 1 (13) 2 (12) MC3456 Threshold 3 (11) 7 Control Voltage 0.01 F RA C RL 6 (8) Trigger Gnd Pin numbers in parenthesis ( ) indicate B-Channel t = 50 s/cm (RA = 10 k, C = 0.01 F, RL = 1.0 k, VCC = 15 V) Figure 17. Astable Circuit +VCC (5.0 to 15 V) Figure 18. Astable Waveforms RL Reset 4 (10) Output 5 (9) Trigger 6 (8) 7 Gnd 1/2 VCC 14 1 (13) 2 (12) 3 (11) Control Voltage 0.01 F Discharge Threshold RA MC3456 RL RB C t = 20 s/cm (RA = 5.1 k, C = 0.0 1 F, RL = 1.0 k, RB = 3.9 k, VCC = 15 V) Astable Mode In the astable mode the timer is connected so that it will retrigger itself and cause the capacitor voltage to oscillate between 1/3 VCC and 2/3 VCC (see Figure 17). The external capacitor charges to 2/3 VCC through RA and RB and discharges to 1/3 VCC through RB. By varying the ratio of these resistors the duty cycle can be varied. The charge and discharge times are independent of the supply voltage. The charge time (output high) is given by: t1 = 0.695 (RA+RB) C discharge current (Pin 7 current) within the maximum rating of the discharge transistor (200 mA). The minimum value of RA is given by: RA VCC (Vdc) VCC (Vdc) I7 (A) 0.2 Figure 19. Free Running Frequency 100 10 C, CAPACITANCE ( F) The discharge time (output low) by: t2 = 0.695 (RB) C Thus the total period is given by: T = t1 + t2 = 0.695 (RA + 2RB) C 1.44 1 The frequency of oscillation is then: f = = (RA +2RB) C T and may be easily found as shown in Figure 19. The duty cycle is given by: DC = RB RA +2RB 1.0 0.1 0.01 (RA + 2 RB) To obtain the maximum duty cycle, RA must be as small as possible; but it must also be large enough to limit the 0.001 0.1 1.0 10 100 1.0 k 10 k f, FREE RUNNING FREQUENCY (Hz) 100 k 6 MOTOROLA ANALOG IC DEVICE DATA MC3456 APPLICATIONS INFORMATION Tone Burst Generator For a tone burst generator, the first timer is used as a monostable and determines the tone duration when triggered by a positive pulse at Pin 6. The second timer is enabled by the high output of the monostable. It is connected as an astable and determines the frequency of the tone. Dual Astable Multivibrator This dual astable multivibrator provides versatility not available with single timer circuits. The duty cycle can be adjusted from 5% to 95%. The two outputs provide two phase clock signals often required in digital systems. It can also be inhibited by use of either reset terminal. Figure 20. Tone Burst Generator Reset 4 6 Trigger 1 Discharge 2 Threshold C1- 7 Gnd 1/2 + 15 V 14 VCC 5 Output 3 Control 0.01 F 10 Reset 9 Output 7 Gnd 1/2 RT Trigger 14 VCC 13 Discharge RA 12 Threshold 8 Trigger 11 Control 0.01 mF RB MC3456 MC3456 C2 Gnd t = 1.1 RT C1 f= 1.44 (RA + 2RB) C Figure 21. Dual Astable Multivibrator +15 V R1 Reset 2 Threshold 1/2 4 14 5 10 k 1N914 1N914 10 k 9 Output 10 Reset 12 1/2 R2 Output MC3456 6 Trigger 3 7 Gnd Output 0.001 0.001 Threshold 13 Discharge 1 Discharge Control Voltage 8 Trigger MC3456 11 C1 Control Voltage C2 Gnd f= 0.91 for C1 = C2 (R1 + R2) C Duty Cycle R2 R1 + R2 MOTOROLA ANALOG IC DEVICE DATA 7 MC3456 Pulse Width Modulation If the timer is triggered with a continuous pulse train in the monostable mode of operation, the charge time of the capacitor can be varied by changing the control voltage at Pin 3. In this manner, the output pulse width can be modulated by applying a modulating signal that controls the threshold voltage. Test Sequences Several timers can be connected to drive each other for sequential timing. An example is shown in Figure 24 where the sequence is started by triggering the first timer which runs for 10 ms. The output then switches low momentarily and starts the second timer which runs for 50 ms and so forth. Figure 22. Pulse Width Modulation Waveforms Figure 23. Pulse Width Modulation Circuit +VCC (5.0 V to 15 V) Modulation Input Voltage 5.0 V/cm RL 4 (10) Reset Output Output 5 (9) 1/2 RA VCC 14 Discharge 1 (13) Threshold 2 (12) Control 3 (11) Gnd 7 Modulation Input MC3456 C Clock Input Voltage 5.0 V/cm Output Voltage 5.0 V/cm Capacitor Voltage 5.0 V/cm Clock Input Trigger 6 (8) t = 0.5 ms/cm (RA = 10 kW, C = 0.02 mF, VCC = 15 V) Figure 24. Sequential Timing Circuit VCC (5.0 V to 15 V) 9.1 k VCC Threshold Discharge Reset 0.01 F 27 k 9.1 k Threshold Discharge Trigger VCC Reset 0.01 F 27 k 50 k VCC Threshold Discharge Trigger 1/2 Reset 0.01 F 1/2 Control Output 0.001 F 1/2 Control Output 0.001 F Gnd Control Output MC3456 MC3456 MC3456 Trigger 1.0 F Gnd 5.0 F Gnd 5.0 F Load Load Load 8 MOTOROLA ANALOG IC DEVICE DATA MC3456 OUTLINE DIMENSIONS P SUFFIX PLASTIC PACKAGE CASE 646-06 ISSUE L NOTES: 1. LEADS WITHIN 0.13 (0.005) RADIUS OF TRUE POSITION AT SEATING PLANE AT MAXIMUM MATERIAL CONDITION. 2. DIMENSION L TO CENTER OF LEADS WHEN FORMED PARALLEL. 3. DIMENSION B DOES NOT INCLUDE MOLD FLASH. 4. ROUNDED CORNERS OPTIONAL. DIM A B C D F G H J K L M N INCHES MIN MAX 0.715 0.770 0.240 0.260 0.145 0.185 0.015 0.021 0.040 0.070 0.100 BSC 0.052 0.095 0.008 0.015 0.115 0.135 0.300 BSC 0_ 10_ 0.015 0.039 MILLIMETERS MIN MAX 18.16 19.56 6.10 6.60 3.69 4.69 0.38 0.53 1.02 1.78 2.54 BSC 1.32 2.41 0.20 0.38 2.92 3.43 7.62 BSC 0_ 10_ 0.39 1.01 14 8 B 1 7 A F C N H G D SEATING PLANE L J K M -A- 8 5 D SUFFIX PLASTIC PACKAGE CASE 751-05 (SO-14) ISSUE N -B- 4X P 0.25 (0.010) M 1 4 B M NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. DIM A B C D F G J K M P R MILLIMETERS MIN MAX 4.80 5.00 3.80 4.00 1.35 1.75 0.35 0.49 0.40 1.25 1.27 BSC 0.18 0.25 0.10 0.25 0_ 7_ 5.80 6.20 0.25 0.50 INCHES MIN MAX 0.189 0.196 0.150 0.157 0.054 0.068 0.014 0.019 0.016 0.049 0.050 BSC 0.007 0.009 0.004 0.009 0_ 7_ 0.229 0.244 0.010 0.019 G C -T- 8X SEATING PLANE R X 45 _ F D 0.25 (0.010) M K TB M_ S J S A MOTOROLA ANALOG IC DEVICE DATA 9 MC3456 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 20912; Phoenix, Arizona 85036. 1-800-441-2447 or 602-303-5454 MFAX: RMFAX0@email.sps.mot.com - TOUCHTONE 602-244-6609 INTERNET: http://Design-NET.com JAPAN: Nippon Motorola Ltd.; Tatsumi-SPD-JLDC, 6F Seibu-Butsuryu-Center, 3-14-2 Tatsumi Koto-Ku, Tokyo 135, Japan. 03-81-3521-8315 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852-26629298 10 MOTOROLA ANALOG IC DEVICE DATA MC3456/D *MC3456/D* |
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