View MC1455D_294138.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

Order this document by MC1455/D
Timing Circuit
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
MC1455, B
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
D SUFFIX PLASTIC PACKAGE CASE 751 (SO-8) P1 SUFFIX PLASTIC PACKAGE CASE 626
8 1
8 1
Figure 1. 22 Second Solid State Time Delay Relay Circuit
1.0 k MT2 3 10 k 5 0.01 F 4 2 8 MC1455 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
ORDERING INFORMATION
Device MC1455P1 MC1455D MC1455BD MC1455BP1 Operating Temperature Range TA = 0 to +70C Package Plastic DIP SO-8 SO-8 Plastic DIP
0.1 F
TA = - 40 to +85C
Figure 3. General Test Circuit
VCC
VR
ICC 8 700 VCC 7 Discharge MC1455 Threshold 6 Gnd 1 Trigger 2 Ith 4
Figure 2. Representative Block Diagram
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 7 + 0.01 F
Reset 5 Control Voltage 3
Threshold
Discharge VO
Output ISink ISource
2.0 k
VS
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 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.
w v
(c) Motorola, Inc. 1999
Rev 4, 06/1999
MOTOROLA ANALOG IC DEVICE DATA
1
MC1455, B
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 Storage Temperature Range Symbol VCC I7 PD PD TA -40 to +85 0 to +70 Tstg -65 to +150 C Value +18 200 625 5.0 625 160 Unit Vdc mA mW mW/C mW C/W C
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 = VCC = 15 V, RL = Symbol VCC ICC - - - - - Vth/VCC VT - - IT VR IR Ith Idischg VCL 9.0 2.6 VOL - - - - - - VOH - 12.75 2.75 tr tf - - 12.5 13.3 3.3 100 100 - - - - - ns ns 0.1 0.4 2.0 2.5 - 0.25 0.25 0.75 2.5 - - 0.35 V 10 3.33 11 4.0 V - 0.4 - - - 5.0 1.67 0.5 0.7 0.1 0.1 - - - - 1.0 - 0.25 100 A V mA A nA V - 3.0 10 1.0 50 0.1 2/3 6.0 15 - - - - V % PPM/C %/V Min 4.5 Typ - Max 16 Unit V mA
R R, Low State (Note 1)
Timing Error (R = 1.0 k to 100 k) (Note 2) Initial Accuracy C = 0.1 F 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
NOTES: 1. Supply current when output is high is typically 1.0 mA less. 2. Tested at VCC = 5.0 V and VCC = 15 V Monostable mode. 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
MC1455, B
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 6. High Output Voltage
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
Figure 7. Low Output Voltage @ VCC = 5.0 Vdc
VCC -VOH (Vdc)
1.0
25C
0.1
0.01 1.0
2.0
5.0
10 ISink (mA)
20
50
100
Figure 8. Low Output Voltage @ VCC = 10 Vdc
10 VOL, LOW OUTPUT VOLTAGE (Vdc) VOL, LOW OUTPUT VOLTAGE (Vdc) 10
Figure 9. Low Output Voltage @ VCC = 15 Vdc
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
MOTOROLA ANALOG IC DEVICE DATA
3
MC1455, B
Figure 10. Delay Time versus Supply Voltage
1.015 t d, DELAY TIME NORMALIZED 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 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 25C 0C
4
MOTOROLA ANALOG IC DEVICE DATA
MC1455, B
Figure 13. 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 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
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 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 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.
Figure 14. Monostable Circuit
+VCC (5.0 V to 15 V)
RL Output 3 RL 2 Trigger
Reset 4
VCC 8
RA Discharge 7 6 Threshold 5 C
MC1455
1
Control Voltage
0.01 F
MOTOROLA ANALOG IC DEVICE DATA
5
MC1455, B
Figure 15. Monostable Waveforms
100 10 C, CAPACITANCE ( F) 1.0 0.1 0.01
Figure 16. Time Delay
t = 50 s/cm (RA = 10 k, C = 0.01 F, RL = 1.0 k, VCC = 15 V)
0.001 10 s
100 s 1.0 ms
10 ms 100 ms td, TIME DELAY (s)
1.0
10
100
Figure 17. Astable Circuit
+VCC (5.0 V to 15 V)
Figure 18. Astable Waveforms
RL Output 3 Trigger RL 2
Reset 4
VCC 8 7 Discharge MC1455 6 Threshold 5 1 Control Voltage
RA
RB
C t = 20 s/cm (RA = 5.1 k, C = 0.01 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 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 The discharge time (output low) is given by: t2 = 0.695 (RB) C Thus the total period is given by: T = t1 + t2 = 0.695 (RA +2RB) C 1 1.44 The frequency of oscillation is then: f = = T (RA +2RB) C and may be easily found as shown in Figure 19. The duty cycle is given by: DC = RB RA +2RB
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) I7 (A) VCC (Vdc) 0.2
Figure 19. Free Running Frequency
100 10
C, CAPACITANCE ( F)
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
MC1455, B
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 VCC to 2/3 VCC. The linear ramp time is given by: t= 2 VCC VCC - VB - VBE , where I = 3 1 RE 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.
If VB is much larger than VBE, then t can be made independent of VCC.
Figure 20. Linear Voltage Sweep Circuit
VCC
Figure 21. Missing Pulse Detector
+VCC (5.0 V to 15 V)
Reset
4
8
VCC RE 2N4403 or Equiv R1 RL 3 VB Output
Reset 4
VCC 8 Discharge 7 Threshold 6 Control 5 Voltage 0.01 F
RA
Digital 3 Output MC1455 Trigger 2
7 6 5 1 0.01 F
VE I Sweep Output Control Voltage
MC1455 R2 C Input 2 Trigger 1
C
2N4403 or Equiv
Figure 22. Linear Voltage Ramp Waveforms
Figure 23. Missing Pulse Detector Waveforms
t = 100 s/cm (RE = 10 k, R2 = 100 k, R1 = 39 k, C = 0.01 F, VCC = 15 V)
t = 500 s/cm (RA = 2.0 k, RL = 1.0 k, C = 0.01 F, VCC = 15 V)
MOTOROLA ANALOG IC DEVICE DATA
7
MC1455, B
Pulse Width Modulation If the timer is triggered with a continuous pulse train in the monstable 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. Figure 24. Pulse Width Modulator
+VCC (5.0 V to 15 V)
Figure 25. Pulse Width Modulation Waveforms
RL 3 Output
RA 4 8 7 C MC1455 2 6 5 Modulation Input t = 0.5 ms/cm (RA = 10 k, C = 0.02 F, VCC = 15 V)
Clock Input
1
Test Sequences 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.
Figure 26. Sequential Timer
VCC (5.0 V to 15 V) 9.1 k 8 6 MC1455 7 2 3 0.001 F 1.0 F 1 5.0 F 1 4 5 0.01 F 6 7 2 MC1455 3 0.001 F 5.0 F 1 27 k 9.1 k 8 4 5 0.01 F 6 7 2 MC1455 3 27 k 18.2 k 8 4 5 0.01 F
Load
Load
Load
8
MOTOROLA ANALOG IC DEVICE DATA
MC1455, B
OUTLINE DIMENSIONS
P1 SUFFIX PLASTIC PACKAGE CASE 626-05 ISSUE K
8 5
-B-
1 4
F
NOTE 2
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
-A- L
C -T-
SEATING PLANE
J N D K
M
M TA B
H
G 0.13 (0.005)
M M
MOTOROLA ANALOG IC DEVICE DATA
9
MC1455, B
OUTLINE DIMENSIONS
D SUFFIX PLASTIC PACKAGE CASE 751-06 (SO-8) ISSUE T A
8
D
5
C
E
1 4
H
0.25
M
B
M
h B C e A
SEATING PLANE
X 45 _
NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994. 2. DIMENSIONS ARE IN MILLIMETER. 3. DIMENSION D AND E DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE. 5. DIMENSION B DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 TOTAL IN EXCESS OF THE B DIMENSION AT MAXIMUM MATERIAL CONDITION. DIM A A1 B C D E e H h L MILLIMETERS MIN MAX 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 4.80 5.00 3.80 4.00 1.27 BSC 5.80 6.20 0.25 0.50 0.40 1.25 0_ 7_
q
L 0.10 A1 B 0.25
M
CB
S
A
S
q
10
MOTOROLA ANALOG IC DEVICE DATA
MC1455, B
NOTES
MOTOROLA ANALOG IC DEVICE DATA
11
MC1455, B
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. Mfax is a trademark of Motorola, Inc. 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 Customer Focus Center: 1-800-521-6274 MfaxTM: RMFAX0@email.sps.mot.com - TOUCHTONE 1-602-244-6609 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; Silicon Harbour Centre, Motorola Fax Back System - US & Canada ONLY 1-800-774-1848 2, Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong. - http://sps.motorola.com/mfax/ 852-26668334 HOME PAGE: http://motorola.com/sps/ JAPAN: Motorola Japan Ltd.; SPD, Strategic Planning Office, 141, 4-32-1 Nishi-Gotanda, Shinagawa-ku, Tokyo, Japan. 81-3-5487-8488
12
MOTOROLA ANALOG IC DEVICE DATA MC1455/D

▲Up To Search▲

Price & Availability of MC1455D

	To Download MC1455D Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .