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ON MC1455 MC1455B NCV1455B Timers handbook

1. Rating Symbol Value Unit Power Supply Voltage Voc 18 Discharge Current Pin 7 15 200 Power Dissipation Package Limitation P1 Suffix Plastic Package Pp 625 mW Derate above T4 25 C 5 0 mW C D Suffix Plastic Package Pp ee D Derate above 25 Operating Temperature Range Ambient MC1455B 40 to 85 MC1455 0 to 70 NCV1455B 40 to 125 Maximum Operating Die Junction Temperature Ty 150 C Storage Temperature Range Tstg 65 to 150 ELECTRICAL CHARACTERISTICS T4 25 5 0 V to 15 V unless otherwise noted Characteristics Symbol Min Typ Max Unit Operating Supply Voltage Range Voc 4 5 16 V Supply Current loc mA Voc 5 0 V RL 3 0 6 0 Voc 15 V Low State Note 1 10 15 Timing Error R 1 0 k to 100 Note 2 Initial Accuracy C 0 1 uF 1 0 96 Drift with Temperature 50 5 Drift with Supply Voltage 0 1 T 211 Threshold Voltage Supply Voltage Vi Vcc 2 3 Trigger Voltage VT V Vcc 15V 3 5 0 Voc 5 0 V 1 67 Trigger Current Ir 0 5 uA Reset Voltage Vn 0 4 0 7 1 0 V Reset Current In 0 1 mA Threshold Current Note 3 lin 0 1 0 25 uA Discharge Leakage Current Pin 7 ldischg 100 nA Control Voltage Level VcL V Voc 15 V 9 0 10 11 Vcc 5 0 V 2 6 3 33 4 0 Output Voltage Low VoL V Isink 50 mA Vcc 15 V 0 4 0 75 Isink 100 mA Vcc
2. C1455BD fv R3 MC1455 MC1455B NCV1455B Timers The MC1455 monolithic 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 time is precisely controlled by one external resistor and capacitor 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 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 NE555 Timers 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 117 Vac 60 Hz 10k 5 220 8 MC1455 7 5 0 1 uF 0 01 e 1 1 0uF 5 C 10V 1N4003 35k 1 1 R and C 22 sec mano Y 10 uF Time delay t is variable by 250 V changing R and C see Figure 16 Figure 1 22 Second Solid State Time Delay Relay Circuit ON Semiconductor http onsemi com MARKING DIAGRAMS D AWL P1 SUFFIX PLASTIC PACKAGE CASE 62
3. 20 IN JA oe Q amp NS NS ST SA L y Sv amp 01 yy lt S 0 01 0 001 10us 100us 1 0ms 10ms 1008 1 0 10 100 ty TIME DELAY s Figure 16 Time Delay Output Voltage 10 V cm z 2 EM N 5 0 V cm E EN 1 20 us cm Ra 5 1 C 0 01 uF Ry 1 0 Rg 3 9 KQ Voc 15 V Figure 18 Astable Waveforms To obtain the maximum duty cycle RA must be as small as possible but it must also be large enough to limit the discharge current Pin 7 current within the maximum rating of the discharge transistor 200 mA The minimum value of RA is given by Vcc Vdc Vcc Vdc gt 0 2 I7 o e C CAPACITANCE uF e e 0 001 10k IN 0 1 1 0 10 100 1 0k 100 f FREE RUNNING FREQUENCY Hz Figure 19 Free Running Frequency http onsemi com 6 1455 MC1455B NCV1455B APPLICATIONS INFORMATION Linear Voltage Ramp In the monostable mode the resistor can be replaced by a constant current source to provide a linear ramp voltage The capacitor still charges from 0 to 2 3 Vcc The linear ramp time is given by 2 Vcc eibi 3 1 RE If is much larger than then t can be made independent of Vcc t Voc Reset 4 89Vcc R ES 2 Equiv p B MC1455 6 2 Trigger O 5 s Le 2 R2 0 01 uF Control _L Vo
4. http onsemi com 8 MC1455 MC1455B NCV1455B PACKAGE DIMENSIONS P1 SUFFIX PLASTIC PACKAGE CASE 626 05 ISSUEL NOTES 1 DIMENSION L TO CENTER OF LEAD WHEN FORMED PARALLEL 2 PACKAGE CONTOUR OPTIONAL ROUND OR SQUARE CORNERS 3 DIMENSIONING AND TOLERANCING PER ANSI Y14 5M 1982 MILLIMETERS INCHES DIM MIN MAX MIN MAX 940 10 16 0 370 0 400 6 10 660 0240 0 260 394 445 0155 0 175 038 051 0 015 0 020 1 02 178 0 040 0 070 0 100 BSC 0 030 0 050 0 012 1 0 135 7 62 BSC 0 300 BSC w 10 3 J 076 101 0 030 0 040 SEATING N PLANE 41 0 K cm H G 10013 0 005 05 T A db B NOTE 2 z ze r xcir o m ojoj m o gt w eo 1 1 0 e oO oe exe oe O ojo http onsemi com 9 MC1455 MC1455B NCV1455B PACKAGE DIMENSIONS D SUFFIX PLASTIC PACKAGE CASE 751 07 SO 8 ISSUE AA NOTES DIMENSIONING AND TOLERANCING PER ANSI Y14 5M 1982 2 CONTROLLING DIMENSION MILLIMETER 3 DIMENSION 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 0 25 0 010 09 PROTRUSION ALLOWABLE DAMBAR PROTRUSION SHALL BE 0 127 0 005 TOTAL IN EXCESS OF THE
5. 0 50 100 Igink mA Figure 8 Low Output Voltage Voc 10 Vdc LOW OUTPUT VOLTAGE Vdc Icc SUPPLY CURRENT mA VoL LOW OUTPUT VOLTAGE Vdc 10 8 0 6 0 4 0 2 0 10 1 0 0 1 0 01 0 1 0 01 25 C 10 Voc SUPPLY VOLTAGE Vdc Figure 5 Supply Current 25 C 5 0 10 20 Igink MA Figure 7 Low Output Voltage Voc 5 0 Vdc 50 100 25 C http onsemi com 3 5 0 10 20 Igink MA Figure 9 Low Output Voltage Voc 15 Vde 50 100 tg DELAY TIME NORMALIZED 1 015 1 010 1 005 1 000 0 995 0 990 0 985 0 MC1455 MC1455B NCV1455B 50 10 Voc SUPPLY VOLTAGE Vdc Figure 10 Delay Time versus Supply Voltage tpg PROPAGATION DELAY TIME ns 300 250 1 015 Q 1 010 N 1 1 005 m 2 1 000 gt 5 0 995 ct 22 0 990 0 985 15 20 75 50 235 0 25 50 75 100 125 Ta AMBIENT TEMPERATURE Figure 11 Delay Time versus Temperature 0 C 70 C 25 C 0 1 0 2 0 3 0 4 min MINIMUM TRIGGER VOLTAGE x Vcc Vde Figure 12 Propagation Delay versus Trigger
6. 15 V en 2 5 Isink 200 mA Vcc 15 V z E 2 Isink 8 0mA Vcc 5 0 V 0 25 0 35 Isink 5 0mA Voc 5 0 V Output Voltage High V Voc 15 V Iaource 200 mA 2 12 5 Voc 15 V Igource 100 mA 12 75 13 3 Voc 5 0 V Igource 100 mA 2 75 3 3 Rise Time Differential Output tr 100 ns Fall Time Differential Output tr 100 ns Supply current when output is high is typically 1 0 mA less Tested at Voc 5 0 V and 15 V Monostable mode h 70 C for 1455 Thigh 85 C for MC1455B Thigh 125 C for NCV1455B eo http onsemi com 2 Thi NOV prefix is for Automotive and other applications requiring site and change control This will determine the maximum value of RA for 15 V operation The maximum total R 20 MQ Tiow 0 C for MC1455 40 C for MC1455B NCV1455B Vdo PW PULSE WIDTH ns min VoL LOW OUTPUT VOLTAGE Vdc 150 125 100 10 1 0 0 1 0 01 MC1455 MC1455B NCV1455B 0 1 0 2 0 3 0 4 Vr min MINIMUM TRIGGER VOLTAGE x Vcc Vdc Figure 4 Trigger Pulse Width 25 C 5 0 lt lt 15V 2 0 5 0 10 20 50 100 Igource MA Figure 6 High Output Voltage 25 C 2 0 5 0 10 2
7. 6 D SUFFIX PLASTIC PACKAGE CASE 751 Specific Device Code A Assembly Location WL L Wafer Lot YY Y Year WW W Work Week ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page of this data sheet Create Named OrderingInfoText Pr me 1 Vs e cl Reset Q4 8 700 0 01 uF 7 Control Discharge Voltage wctass 3 Threshold Output lt gt V 67 20k Ith amp AAA Igy Gnd Trigger Er ink 1 2 Isource 28 5 2 O Discharge 5 Comp Flip Control Voltage C R Flop 5k Ql 3 g Inhibit d 2 O Output 2 Reset Trigger C H B 4 Figure 2 Representative Block Diagram Semiconductor Components Industries LLC 2004 March 2004 Rev 8 Test circuit for measuring DC parameters to set output and measure parameters a When Vs 2 8 Vcc Vo is low b When Vs x 1 3 Vcc Vo is high c When Vo is low Pin 7 sinks current To test for Reset set Vo high apply Reset voltage and test for current flowing into Pin 7 When Reset is not in use it should be tied to Vcc Figure 3 General Test Circuit Publication Order Number MC1455 D MC1455 MC1455B NCV1455B MAXIMUM RATINGS 25 C unless otherwise noted
8. D DIMENSION AT MAXIMUM K SS NI ON MATERIAL CONDITION 6 751 01 THRU 751 06 ARE OBSOLETE NEW STANDARD IS 751 07 MILLIMETERS INCHES DIM MIN MAX MIN MAX N x45 A 480 500 0 189 0 197 B 380 400 0 150 0 157 Jmm N C 135 175 0 053 0 069 1 D 0 33 0 51 0 013 0 020 Jf e G 1 27 BSC 0 050 BSC nes gt 0 10 0 004 10 0 10 0 004 004 Y x 025 0004 0 010 M J J 019 025 0 007 0 010 K 040 127 0016 0 050 M 09 oof 8 N 0 25 0 50 0 010 0 020 0 25 0 010 z XO s 50 620 0228 0244 ON Semiconductor and m are registered trademarks of Semiconductor Components Industries LLC SCILLC SCILLC reserves the right to make changes without further notice to any products herein SCILLC makes no warranty representation or guarantee regarding the suitability of its products for any particular purpose nor does SCILLC 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 special consequential or incidental damages Typical parameters which may be provided in SCILLC data sheets and or specifications can and do vary in different applications and actual performance may vary over time All operating parameters including Typical
9. Voltage http onsemi com 4 MC1455 MC1455B NCV1455B O Control Voltage Threshold Trigger Comparator Comparator Flip Flop Output M e Vcc 47k 830 47k 1 0k 6 8 k S Threshold O L Am vve 3 9k wh 9 0 Output c lt b Trigger O Reset 220 Reset 13 Discharge O Discharge i da Gnd O71 100 E Figure 13 Representative Circuit Schematic GENERAL OPERATION The MC1455 is a monolithic timing circuit which uses an external resistor capacitor network as its timing element 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 te
10. emi com litorder Phone 303 675 2175 or 800 344 3860 Toll Free USA Canada Japan ON Semiconductor Japan Customer Focus Center M Fax 303 675 2176 800 344 3867 Toll Free USA Canada 2 9 1 Kamimeguro Meguro ku Tokyo Japan 153 0051 For additional information please contact your Email orderlit onsemi com Phone 81 3 5773 3850 local Sales Representative MC1455 D
11. ge i Output 7 0 i 3 6 1455 1 R 2 TC Trigger Control 1 Voltage 0 01 uF Figure 14 Monostable Circuit http onsemi com MC1455 MC1455B NCV1455B NENNEN ENE Capacitor Voltage t 50 us cm Ra 10 KQ C 0 01 uF Ri 1 0 Voc 15 V Figure 15 Monostable Waveforms 5 0 V to 15 V Reset Voc Ra RL 4 8 i Output 7 Discharge eo 3 MC1455 6 Threshold Trigger 5 V Q Control Voltage T HO Figure 17 Astable Circuit 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 changes to 2 3 Vcc through Ra and and discharges to 1 3 through Rg 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 t4 0 695 The discharge time output low is given by to 0 695 Rp Thus the total period is given by T ti 12 0 695 RA 2RB C olo The frequency of oscillation is then 1 RA 2RB C and may be easily found as shown in Figure 19 RB DC The duty cycle is given by 100 10 T
12. ltage Figure 20 Linear Voltage Sweep Circuit Input Voitage Capacitor Voltage 5 0 t 100 us cm Re 10 KQ R2 100 R1 39 C 0 01 uF 15 V ra a EX EP pr Figure 22 Linear Voltage Ramp Waveforms Missing Pulse Detector The timer can be used to produce an output when an input pulse fails to occur within the delay of the timer To accomplish this set the time delay to be slightly longer than the time between successive input pulses The timing cycle is then continuously reset by the input pulse train until a change in frequency or a missing pulse allows completion of the timing cycle causing a change in the output level 5 0 V to 15 V V Reset cc R R L 4 8 A 3 Discharge Output 7 MC1455 Threshold 6 Control AC Input 2 5 Voltage Trigger 1 0 01 2N4403 or Equiv Figure 21 Missing Pulse Detector input Voltage 42 0 t 500 us cm RA 2 0 KQ 1 0 KQ C 0 01 uF Voc 15 V Figure 23 Missing Pulse Detector Waveforms http onsemi com 7 MC1455 MC1455B NCV1455B 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 5 In this manner the output pulse width can be modulated by a
13. pplying a modulating signal that controls the threshold voltage 5 0 V to 15 V e 9 RL Ra 4 8 t 0 5 ms cm 3 7 RA 10 C 0 02 uF 15 V O Output TE Figure 25 Pulse Width Modulation Waveforms 6 1455 o 2 5 oa 9 Test Sequences fae ru Several timers can be connected to drive each other for sequential timing An example is shown in Figure 26 where the sequence is started by triggering the first timer which runs for 10 ms The output then switches low momentarily Figure 24 Pulse Width Modulator and starts the second timer which runs for 50 ms and so forth Voc 5 0 V to 15 V 9 9 9 9 9 1k 94k 182k 8 4 8 4 8 4 6 5 0 01 uF 6 5 0 01 uF 6 0 01 uF 3 2 0 4 0 MC1455 3 Z mcus 7 3 2 3 2 3 0 1 4 6 1 4 1 0 0 001 uF 0 001 uF 2 2 1 1 T 10pF 5 0 FF 1 5 0 uF 1 i Load j Load 7 7 Load Figure 26 Sequential Timer DEVICE ORDERING INFORMATION MC1455P1 TA 0 C to 70 C Plastic Dip 50 Units Rail MC1455D Ta 0 C to 70 C 98 Units Rail MC1455BP1 40 C to 85 C Plastic Dip 50 Units Rail NCV1455BDR2 Ta 40 C to 125 C 2500 Tape amp Rail NCV prefix is for automotive and other applications requiring site and control changes MC1455BD Ta 40 C to 85 C 98 Units Rail
14. rminal and the discharge transistor terminal are connected together in this mode refer to circuit in Figure 14 When the input voltage to the trigger comparator falls below 1 3 Vcc the comparator output triggers the flip flop so that its 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 16 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 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 Vcc 5 0 V to 15 V ee o e Reset Vi R E RL a Dischar
15. s must be validated for each customer application by customer s technical experts SCILLC does not convey any license under its patent rights nor the rights of others SCILLC 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 SCILLC product could create a situation where personal injury or death may occur Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application Buyer shall indemnify and hold SCILLC 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 SCILLC was negligent regarding the design or manufacture of the part SCILLC is an Equal Opportunity Affirmative Action Employer This literature is subject to all applicable copyright laws and is not for resale in any manner PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT N American Technical Support 800 282 9855 Toll Free ON Semiconductor Website http onsemi com Literature Distribution Center for ON Semiconductor USA Canada P O Box 5163 Denver Colorado 80217 USA Order Literature http www ons

ON MC1455 MC1455B NCV1455B Timers handbook

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