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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 TTL circuits.
Features
8 1
http://onsemi.com MARKING DIAGRAMS
8 SOIC-8 D SUFFIX CASE 751 1 8 PDIP-8 P1 SUFFIX CASE 626 1 x yyy A L Y, YY W, WW G or G 1 = B or V = BP1 or P1 = Assembly Location = Wafer Lot = Year = Work Week = Pb-Free Package MC1455yyy AWL YYWWG 1455x ALYW G
* * * * * * * * *
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 TTL Temperature Stability of 0.005% per C Normally ON or Normally OFF Output Pb-Free Packages are Available
8
1.0 k MT2 3 10 k 5 0.01 mF 4 2 8 MC1455 1 6 7 1.0 mF 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 R 20 M G MT1
Load 117 Vac/60 Hz
ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions section on page 9 of this data sheet.
0.1 mF
1N4003 10 mF + VR Reset 5 Control Voltage 3 7 Output Discharge VO ISink ISource 4 8 VCC MC1455 Threshold 6 GND Trigger 1 2 Ith 2.0 k VS 7 Discharge
ICC 700
VCC
Figure 1. 22 Second Solid State Time Delay Relay Circuit
VCC 8 6 5 Control Voltage 5k 2 5k 1 GND 4 Reset + Comp -B 5k + Comp A Flip R Flop Q S Inhibit/ Reset 3 Output + 0.01 mF
Threshold
Trigger
Test circuit for measuring DC parameters (to set output and measure parameters): a) When VS w 2/3 VCC, VO is low. b) When VS v 1/3 VCC, VO is high. c) When VO is low, Pin 7 sinks current. To test for Reset, set VO c) high, apply Reset voltage, and test for current flowing into Pin 7. c) When Reset is not in use, it should be tied to VCC.
Figure 2. Representative Block Diagram
(c) Semiconductor Components Industries, LLC, 2009
Figure 3. General Test Circuit
1 Publication Order Number: MC1455/D
December, 2009 - Rev. 10
MC1455, MC1455B, NCV1455B
MAXIMUM RATINGS (TA = +25C, unless otherwise noted.)
Rating Power Supply Voltage Discharge Current (Pin 7) Power Dissipation (Package Limitation) P1 Suffix, Plastic Package Derate above TA = +25C D Suffix, Plastic Package Derate above TA = +25C Operating Temperature Range (Ambient) MC1455B MC1455 NCV1455B Maximum Operating Die Junction Temperature Storage Temperature Range Symbol VCC I7 PD PD TA Value +18 200 625 5.0 625 160 -40 to +85 0 to +70 -40 to +125 +150 -65 to +150 Unit Vdc mA mW mW/C mW C/W C
TJ Tstg
C C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
ELECTRICAL CHARACTERISTICS (TA = +25C, VCC = +5.0 V to +15 V, unless otherwise noted.)
Characteristics Operating Supply Voltage Range Supply Current VCC = 5.0 V, RL = R VCC = 15 V, RL = R, Low State (Note 1) Timing Error (R = 1.0 kW to 100 kW) (Note 2) Initial Accuracy C = 0.1 mF Drift with Temperature Drift with Supply Voltage Threshold Voltage/Supply Voltage Trigger Voltage VCC = 15 V VCC = 5.0 V Trigger Current Reset Voltage Reset Current Threshold Current (Note 3) Discharge Leakage Current (Pin 7) Control Voltage Level VCC = 15 V VCC = 5.0 V Output Voltage Low ISink = 10 mA (VCC = 15 V) ISink = 50 mA (VCC = 15 V) ISink = 100 mA (VCC = 15 V) ISink = 200 mA (VCC = 15 V) ISink = 8.0 mA (VCC = 5.0 V) ISink = 5.0 mA (VCC = 5.0 V) Output Voltage High VCC = 15 V (ISource = 200 mA) VCC = 15 V (ISource = 100 mA) VCC = 5.0 V (ISource = 100 mA) Rise Time Differential Output Fall Time Differential Output 1. 2. 3. 4. Vth/VCC VT Symbol VCC ICC Min 4.5 - - - - - - - - - 0.4 - - - 9.0 2.6 - - - - - - - 12.75 2.75 - - Typ - 3.0 10 1.0 50 0.1 2/3 5.0 1.67 0.5 0.7 0.1 0.1 - 10 3.33 0.1 0.4 2.0 2.5 - 0.25 12.5 13.3 3.3 100 100 Max 16 6.0 15 - - - - - - - 1.0 - 0.25 100 11 4.0 0.25 0.75 2.5 - - 0.35 - - - - - V Unit V mA
% PPM/C %/V
IT VR IR Ith Idischg VCL
mA V mA mA nA V
VOL
V
VOH
V
tr tf
ns ns
`Supply current when output is high is typically 1.0 mA less. Tested at VCC = 5.0 V and VCC = 15 V Monostable mode. This will determine the maximum value of RA + RB for 15 V operation. The maximum total R = 20 MW . Tlow = 0C for MC1455, Tlow = -40C for MC1455B, NCV1455B Thigh = +70C for MC1455, Thigh = +85C for MC1455B, Thigh = +125C for NCV1455B 5. NCV prefix is for Automotive and other applications requiring site and change control.
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MC1455, MC1455B, NCV1455B
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
10 VCC, SUPPLY VOLTAGE (Vdc)
15
Figure 4. Trigger Pulse Width
Figure 5. Supply Current
2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 1.0 5.0 V VCC 15 V 2.0 5.0 10 ISource (mA) 20 50 100 25C VOL, LOW OUTPUT VOLTAGE (Vdc)
10
VCC -VOH (Vdc)
1.0
25C
0.1
0.01 1.0
2.0
5.0
10 ISink (mA)
20
50
100
Figure 6. High Output Voltage
Figure 7. Low Output Voltage @ VCC = 5.0 Vdc
10 VOL, LOW OUTPUT VOLTAGE (Vdc) VOL, LOW OUTPUT VOLTAGE (Vdc)
10
1.0
25C
1.0
0.1
0.1
25C
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
Figure 8. Low Output Voltage @ VCC = 10 Vdc
Figure 9. Low Output Voltage @ VCC = 15 Vdc
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MC1455, MC1455B, NCV1455B
1.015 t d, DELAY TIME NORMALIZED 1.010 1.005 1.000 0.995 0.990 0.985 0 5.0 10 VCC, SUPPLY VOLTAGE (Vdc) 15 20 t d, DELAY TIME NORMALIZED 1.015 1.010 1.005 1.000 0.995 0.990 0.985 - 75
- 50
- 25
0
25
50
75
100
125
TA, AMBIENT TEMPERATURE (C)
Figure 10. Delay Time versus Supply Voltage
Figure 11. Delay Time versus Temperature
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 25C 0C
Figure 12. Propagation Delay versus Trigger Voltage
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MC1455, MC1455B, NCV1455B
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 3.9 k 10 k cb 5.0 k e 4.7 k c b Output
Trigger Reset Reset Discharge GND Discharge 100 100 k 5.0 k 220 4.7 k
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
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 "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.
+VCC (5.0 V to 15 V)
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 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
RL Output 3 RL 2 Trigger
Reset 4
VCC 8
RA Discharge 7 6 Threshold 5 C
MC1455
1
Control Voltage
0.01 mF
Figure 14. Monostable Circuit
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MC1455, MC1455B, NCV1455B
100 10 C, CAPACITANCE ( F) t = 50 ms/cm (RA = 10 kW, C = 0.01 mF, RL = 1.0 kW, VCC = 15 V) 1.0 0.1 0.01
0.001 10 ms
100 ms 1.0 ms
10 ms 100 ms td, TIME DELAY (s)
1.0
10
100
Figure 15. Monostable Waveforms
+VCC (5.0 V to 15 V)
Figure 16. Time Delay
RL Output 3 Trigger RL 2
Reset 4
VCC 8 7 Discharge MC1455 6 Threshold 5 1 Control Voltage
RA
RB
C t = 20 ms/cm (RA = 5.1 kW, C = 0.01 mF, RL = 1.0 kW; RB = 3.9 kW, VCC = 15 V)
Figure 17. Astable Circuit Astable Mode
Figure 18. Astable Waveforms
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 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 t2 + 0.695 (RB) C
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:
RA w
100 10
VCC(Vdc) I7 (A)
w
VCC(Vdc) 0.2
C, CAPACITANCE ( F)
The discharge time (output low) is given by: Thus the total period is given by:
T + t1 ) t2 + 0.695 (RA ) 2RB) C
1.0 0.1 0.01 (RA + 2 RB)
The frequency of oscillation is then:
f+
1 1.44 + 1 (RA ) 2RB)C RB RA ) 2RB
and may be easily found as shown in Figure 19. The duty cycle is given by:
DC +
0.001 0.1
1.0
10 100 1.0 k 10 k f, FREE RUNNING FREQUENCY (Hz)
100
Figure 19. Free Running Frequency http://onsemi.com
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MC1455, MC1455B, NCV1455B
APPLICATIONS INFORMATION
Linear Voltage Ramp Missing Pulse Detector
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 VCC to 2/3 VCC. The linear ramp time is given by:
t= 2 VCC , where I = 3 1 VCC - VB - VBE RE
If VB is much larger than VBE, then t can be made independent of VCC.
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.
+VCC (5.0 V to 15 V) VCC RL Reset 4 8 VCC RE Digital 3 Output MC1455 Trigger 2 5 1 0.01 mF 7 6 VE I Sweep Output Control Voltage 2N4403 or Equiv R1 Output MC1455 VB Input 2 Trigger R2 C 1 3 Reset 4 8 Discharge 7 Threshold 6 Control 5 Voltage 0.01 mF 2N4403 or Equiv
VCC
RA
C
Figure 20. Linear Voltage Sweep Circuit
Figure 21. Missing Pulse Detector
t = 100 ms/cm (RE = 10 kW, R2 = 100 kW, R1 = 39 kW, C = 0.01 mF, VCC = 15 V)
t = 500 ms/cm (RA = 2.0 kW, RL = 1.0 kW, C = 0.01 mF, VCC = 15 V)
Figure 22. Linear Voltage Ramp Waveforms
Figure 23. Missing Pulse Detector Waveforms
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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 applying a modulating signal that controls the threshold voltage.
+VCC (5.0 V to 15 V)
RL 3 Output
RA 4 8 7 C MC1455 2 6 5 Modulation Input t = 0.5 ms/cm (RA = 10 kW, C = 0.02 mF, VCC = 15 V)
Figure 25. Pulse Width Modulation Waveforms
Test Sequences
Clock Input
1
Figure 24. Pulse Width Modulator
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 and starts the second timer which runs for 50 ms and so forth.
VCC (5.0 V to 15 V) 9.1 k 8 6 MC1455 7 2 3 0.001 mF 1.0 mF 1 5.0 mF 1 4 5 0.01 mF 6 7 2 MC1455 3 0.001 mF 5.0 mF 1 27 k 9.1 k 8 4 5 0.01 mF 6 7 2 MC1455 3 27 k 18.2 k 8 4 5 0.01 mF
Load
Load
Load
Figure 26. Sequential Timer
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MC1455, MC1455B, NCV1455B
ORDERING INFORMATION
Device MC1455P1 MC1455P1G MC1455D MC1455DG MC1455DR2 MC1455DR2G MC1455BD MC1455BDG MC1455BDR2 MC1455BDR2G MC1455BP1 MC1455BP1G NCV1455BDR2* NCV1455BDR2G* TA = -40C to +125C TA = -40C to +85C TA = 0C to +70C Operating Temperature Range Package PDIP-8 PDIP-8 (Pb-Free) SOIC-8 SOIC-8 (Pb-Free) SOIC-8 SOIC-8 (Pb-Free) SOIC-8 SOIC-8 (Pb-Free) SOIC-8 SOIC-8 (Pb-Free) PDIP-8 PDIP-8 (Pb-Free) SOIC-8 SOIC-8 (Pb-Free) Shipping 50 Units / Rail 50 Units / Rail 98 Units / Rail 98 Units / Rail 2500 Units / Tape & Reel 2500 Units / Tape & Reel 98 Units / Rail 98 Units / Rail 2500 Units / Tape & Reel 2500 Units / Tape & Reel 50 Units / Rail 50 Units / Rail 2500 Units / Tape & Reel 2500 Units / Tape & Reel
For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. *NCV prefix is for automotive and other applications requiring site and control changes.
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MC1455, MC1455B, NCV1455B
PACKAGE DIMENSIONS
SOIC-8 D SUFFIX CASE 751-07 ISSUE AJ
-X- A
8 5 NOTES: 1. 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 PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. 6. 751-01 THRU 751-06 ARE OBSOLETE. NEW STANDARD IS 751-07. MILLIMETERS MIN MAX 4.80 5.00 3.80 4.00 1.35 1.75 0.33 0.51 1.27 BSC 0.10 0.25 0.19 0.25 0.40 1.27 0_ 8_ 0.25 0.50 5.80 6.20 INCHES MIN MAX 0.189 0.197 0.150 0.157 0.053 0.069 0.013 0.020 0.050 BSC 0.004 0.010 0.007 0.010 0.016 0.050 0_ 8_ 0.010 0.020 0.228 0.244
B
1
S
4
0.25 (0.010)
M
Y
M
-Y- G
K
C -Z- H D 0.25 (0.010)
M SEATING PLANE
N
X 45 _
0.10 (0.004)
M
J
ZY
S
X
S
DIM A B C D G H J K M N S
SOLDERING FOOTPRINT*
1.52 0.060
7.0 0.275
4.0 0.155
0.6 0.024
1.270 0.050
SCALE 6:1
mm inches
*For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D.
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MC1455, MC1455B, NCV1455B
PACKAGE DIMENSIONS
PDIP-8 P1 SUFFIX CASE 626-05 ISSUE L
8
5
-B-
1 4
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. DIM A B C D F G H J K L M N MILLIMETERS MIN MAX 9.40 10.16 6.10 6.60 3.94 4.45 0.38 0.51 1.02 1.78 2.54 BSC 0.76 1.27 0.20 0.30 2.92 3.43 7.62 BSC --10_ 0.76 1.01 INCHES MIN MAX 0.370 0.400 0.240 0.260 0.155 0.175 0.015 0.020 0.040 0.070 0.100 BSC 0.030 0.050 0.008 0.012 0.115 0.135 0.300 BSC --10_ 0.030 0.040
F
NOTE 2
-A-
L
C -T-
SEATING PLANE
J N D K
M
M TA B
H
G 0.13 (0.005)
M M
ON Semiconductor and 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 "Typicals" 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
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MC1455/D

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