MC3456P [MOTOROLA]
DUAL TIMING CIRCUIT; 双定时电路
| 型号： | MC3456P |
| 厂家： | 
MOTOROLA |
| 描述： | DUAL TIMING CIRCUIT |
| 文件： | 总10页 (文件大小：204K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Order this document by MC3456/D
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.
DUAL TIMING CIRCUIT
SEMICONDUCTOR
TECHNICAL DATA
• Direct Replacement for NE556/SE556 Timers
• Timing from Microseconds through Hours
• Operates in Both Astable and Monostable Modes
• Adjustable Duty Cycle
P SUFFIX
PLASTIC PACKAGE
CASE 646
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SO–14)
• 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
PIN CONNECTIONS
1
2
3
14
Discharge A
Threshold A
V
CC
13
12
Discharge B
Figure 1. 22 Second Solid State Time Delay Relay Circuit
Control A
Reset A
Output A
Trigger A
Gnd
Threshold B
Control B
Reset B
4
5
6
7
11
10
9
1.0 k
Load
MT2
3
8
Output B
Trigger B
MT1
6
G
4
2
10 k
R
20 M
C
1/2
MC3456
8
7
5
F
(Top View)
1.0 µF
0.1 µF
0.01
µ
1
1N4003
–10 V
ORDERING INFORMATION
Operating
3.5 k
250 V
–
t = 1.1; R and C = 22 sec
Time delay (t) is variable by
changing R and C (see Figure 16).
1N4740
10
+
µF
Temperature Range
Device
MC3456P
NE556D
Package
Plastic DIP
SO–14
0° to +70°C
Figure 3. General Test Circuit
V
CC
I
CC
V
R
Figure 2. Block Diagram (1/2 Shown)
Reset
4
8
700
V
CC
14
7
5
V
CC
+
F
Control
Voltage
0.01
µ
Discharge
1/2
5 k
MC3456
1 (13)
2 (12)
Threshold
3
Threshold
6
Discharge
Output
+
V
Comp
S
Flip
Flop
2.0 k
Output
3 (11)
Control Voltage
I
A
th
R
S
–
Gnd
1
Trigger
I
I
V
Sink
O
Q
2
5 k
5 k
Source
5 (9)
Inhibit/
Reset
+
Comp
B
6 (8)
Trigger
–
Test circuit for measuring DC parameters (to set output and measure parameters):
a) When V
b) When V
2/3 V , V is low.
S
S
CC O
1/3 V , V is high.
CC
O
7
4 (10)
Reset
c) When V is low, Pin 7 sinks current. To test for Reset, set V high,
O
O
Gnd
c) apply Reset voltage, and test for current flowing into Pin 7. When Reset
c) is not in use, it should be tied to V
.
CC
Motorola, Inc. 1996
Rev 2
MC3456
MAXIMUM RATINGS (T = +25°C, unless otherwise noted.)
A
Rating
Symbol
Value
Unit
Power Supply Voltage
V
+18
200
Vdc
mA
CC
Discharge Current
I
dis
Power Dissipation (Package Limitation)
P Suffix, Plastic Package, Case 646
P
D
625
5.0
1.0
8.0
mW
mW/°C
W
Derate above T = +25°C
A
D Suffix, Plastic Package, Case 751
Derate above T = +25°C
mW/°C
A
Operating Ambient Temperature Range
Storage Temperature Range
T
A
°C
°C
0 to +70
T
–65 to +150
stg
ELECTRICAL CHARACTERISTICS (T = +25°C, V
= +15 V, unless otherwise noted.)
CC
A
Characteristics
Symbol
Min
Typ
Max
Unit
Supply Voltage
Supply Current
V
4.5
–
16
V
CC
I
mA
CC
V
V
= 5.0 V, R = ∞
= 15 V, R = ∞ Low State, (Note 1)
–
–
6.0
20
12
30
CC
CC
L
L
Timing Error (Note 2)
Monostable Mode (R = 2.0 kΩ; C = 0.1 µF)
A
Initial Accuracy
–
–
–
0.75
50
0.1
–
–
–
%
PPM/°C
%/V
Drift with Temperature
Drift with Supply Voltage
Astable Mode (R = R = 2.0 kΩ to 100 kΩ; C = 0.01 µF)
A
B
Initial Accuracy
–
–
–
2.25
150
0.3
–
–
–
%
PPM/°C
%/V
Drift with Temperature
Drift with Supply Voltage
Threshold Voltage
Trigger Voltage
V
–
2/3
–
xV
th
CC
V
T
V
V
V
= 15 V
= 5.0 V
–
–
5.0
1.67
–
–
CC
CC
Trigger Current
I
–
0.4
–
0.5
0.7
–
µA
V
T
Reset Voltage
V
R
1.0
–
Reset Current
I
0.1
mA
µA
V
R
Threshold Current (Note 3)
Control Voltage Level
I
–
0.03
0.1
th
V
CL
V
V
= 15 V
= 5.0 V
9.0
2.6
10
3.33
11
4.0
CC
CC
Output Voltage Low
V
OL
(V
= 15 V)
V
V
CC
I
I
I
I
= 10 mA
= 50 mA
= 100 mA
= 200 mA
= 5.0 V)
= 5.0 mA
–
–
–
–
0.1
0.4
2.0
2.5
0.25
0.75
2.75
–
Sink
Sink
Sink
Sink
(V
CC
I
–
0.25
0.35
Sink
Output Voltage High
V
OH
(I
= 200 mA)
= 15 V
= 100 mA)
= 15 V
Source
V
–
12.5
–
CC
(I
Source
V
V
12.75
2.75
13.3
3.3
–
–
CC
CC
= 5.0 V
Toggle Rate R = 3.3 kΩ, R = 6.8 kΩ, C = 0.003 µF (Figure 17, 19)
–
–
–
–
–
100
20
–
100
–
kHz
nA
ns
A
B
Discharge Leakage Current
I
dis
Rise Time of Output
Fall Time of Output
t
100
100
OLH
t
–
ns
OHL
Matching Characteristics Between Sections
Monostable Mode
Initial Timing Accuracy
Timing Drift with Temperature
Drift with Supply Voltage
–
–
–
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 V
= 5.0 V and V
= 15 V.
CC
CC
3. This will determine the maximum value of R + R for 15 V operation. The maximum total R = 20 mΩ.
A
B
2
MOTOROLA ANALOG IC DEVICE DATA
MC3456
Figure 4. Trigger Pulse Width
Figure 5. Supply Current
150
125
10
25°C
8.0
6.0
100
75
50
0°C
4.0
25°C
70
°
C
2.0
0
25
0
0
0.1
0.2
0.3
0.4
5.0
10
, SUPPLY VOLTAGE (Vdc)
15
V
, MINIMUM TRIGGER VOLTAGE (X V
= Vdc)
V
CC
T (min)
CC
Figure 7. Low Output Voltage
Figure 6. High Output Voltage
(@ V
= 5.0 Vdc)
CC
2.0
1.8
1.6
10
25°C
25°C
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
1.0
0.1
5.0 V
20
≤
V
≤
15 V
50
CC
0.01
1.0
2.0
5.0
10
(mA)
100
1.0
2.0
5.0
10
(mA)
20
50
100
I
I
Sink
Source
Figure 8. Low Output Voltage
Figure 9. Low Output Voltage
(@ V
= 10 Vdc)
(@ V
= 15 Vdc)
CC
CC
10
10
1.0
1.0
0.1
25°C
25°C
0.1
0.01
0.01
1.0
1.0
2.0
5.0
10
(mA)
20
50
100
2.0
5.0
10
(mA)
20
50
100
I
I
Sink
Sink
3
MOTOROLA ANALOG IC DEVICE DATA
MC3456
Figure 10. Delay Time versus Supply Voltage
Figure 11. Delay Time versus Temperature
1.015
1.010
1.015
1.010
1.005
1.005
1.000
0.995
0.990
1.000
0.995
0.990
0.985
0.985
0
5.0
10
15
20
–75
–50
–25
0
25
50
75
C)
100
125
V
, SUPPLY VOLTAGE (Vdc)
T , AMBIENT TEMPERATURE (°
A
CC
Figure 12. Propagation Delay
versus Trigger Voltage
300
250
200
150
100
50
0
°
C
25°C
70
°C
0
0
0.1
0.2
0.3
CC
0.4
V
, MINIMUM TRIGGER VOLTAGE (x V
= Vdc)
4
MOTOROLA ANALOG IC DEVICE DATA
MC3456
Figure 13. 1/2 Representative Circuit Schematic
Control Voltage
Threshold
Comparator
Trigger
Comparator
Flip–Flop
Output
V
CC
4.7 k
830
4.7 k
1.0 k
6.8 k
5.0 k
Threshold
7.0 k
4.7 k
3.9 k
b
Output
10 k
c
c b
e
5.0 k
5.0 k
Trigger
Reset
220
Reset
4.7 k
100 k
Discharge
Gnd
Discharge
100
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.
that the output is high is given by the equation t = 1.1 R C.
A
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
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
10
1.0
voltage to the trigger comparator falls below 1/3 V
the
CC
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
0.1
0.01
reaches 2/3 V
the threshold comparator resets the
CC
0.001
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
10
µs
100
µs
1.0 ms 10 ms
100 ms
1.0
10
100
t , TIME DELAY (s)
d
5
MOTOROLA ANALOG IC DEVICE DATA
MC3456
Figure 15. Monostable Circuit
Figure 16. Monostable Waveforms
+V
CC
(5.0 V to 15 V)
R
C
R
R
A
L
Reset
4 (10)
V
CC
14
Discharge
1 (13)
5 (9)
2 (12)
Output
1/2
Threshold
MC3456
6 (8)
3 (11)
L
Trigger
Control
Voltage
7
Gnd
0.01 µF
t = 50
µs/cm
(R = 10 k
Ω
, C = 0.01 F, R = 1.0 k
µ
Ω, V
= 15 V)
CC
Pin numbers in parenthesis ( ) indicate B–Channel
A
L
Figure 17. Astable Circuit
Figure 18. Astable Waveforms
+V
CC
(5.0 to 15 V)
R
R
R
A
L
Reset
4 (10)
V
CC
14
Output
5 (9)
1 (13)
Discharge
Threshold
1/2
2 (12)
3 (11)
R
C
B
MC3456
Trigger
6 (8)
L
Control
Voltage
0.01 µF
7
Gnd
t = 20
µs/cm
(R = 5.1 k
Ω, C = 0.0 1
µ
F, R = 1.0 k
Ω
, R = 3.9 k
Ω, V
= 15 V)
CC
A
L
B
Astable Mode
In the astable mode the timer is connected so that it will
retrigger itself and cause the capacitor voltage to oscillate
discharge current (Pin 7 current) within the maximum rating
of the discharge transistor (200 mA).
between 1/3 V
and 2/3 V
(see Figure 17).
The minimum value of R is given by:
CC
CC
A
The external capacitor charges to 2/3 V
through R and
CC
through R . By varying the
A
V
(Vdc)
V
(Vdc)
CC
0.2
CC
I (A)
≥
≥
R
R
and discharges to 1/3 V
A
B
CC
B
7
ratio of these resistors the duty cycle can be varied. The
charge and discharge times are independent of the supply
voltage.
Figure 19. Free Running Frequency
The charge time (output high) is given by:
100
10
t = 0.695 (R +R ) C
1
A
B
The discharge time (output low) by:
t = 0.695 (R ) C
2
B
Thus the total period is given by:
T = t + t = 0.695 (R + 2R ) C
1.0
0.1
1
2
A
B
1.44
(R +2R ) C
1
T
The frequency of oscillation is then: f =
=
A
B
and may be easily found as shown in Figure 19.
0.01
R
A
B
+2R
(R + 2 R
)
B
The duty cycle is given by: DC =
A
R
B
0.001
0.1
1.0
10
100
1.0 k
10 k
100 k
To obtain the maximum duty cycle, R must be as small as
A
possible; but it must also be large enough to limit the
f, FREE RUNNING FREQUENCY (Hz)
6
MOTOROLA ANALOG IC DEVICE DATA
MC3456
APPLICATIONS INFORMATION
Tone Burst Generator
Dual Astable Multivibrator
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.
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
+ 15 V
Reset
4
14
V
CC
14
V
CC
R
R
A
T
13 Discharge
12 Threshold
10
6
5
Trigger
Trigger
1
R
Output
B
Reset
1/2
MC3456
1/2
MC3456
Discharge
2
8
Trigger
Control
3
9
11
Control
Output
Threshold
0.01 µF
0.01 mF
7
Gnd
C2
7
Gnd
C1–
Gnd
1.44
f =
t = 1.1 R C1
T
(R + 2R ) C
A
B
Figure 21. Dual Astable Multivibrator
+15 V
10 k
Reset
4
10 k
1N914
1N914
14
10
Reset
R2
R1
2
5
9
12
Output
Threshold
Output
Threshold
1/2
MC3456
1/2
MC3456
0.001
0.001
13
1
6
8
Discharge
Trigger
Discharge
Trigger
Control
Voltage
Control
Voltage
11
3
7
Gnd
C1
Output
C2
Gnd
0.91
(R1 + R2) C
R2
f =
for C1 = C2
Duty Cycle
R1 + R2
7
MOTOROLA ANALOG IC DEVICE DATA
MC3456
Pulse Width Modulation
Test Sequences
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.
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
+V
CC
(5.0 V to 15 V)
Modulation Input Voltage 5.0 V/cm
R
R
L
A
4 (10)
Reset
V
14
CC
Clock Input Voltage
5.0 V/cm
Discharge
Output
1 (13)
Output
5 (9)
Threshold
1/2
MC3456
C
Output Voltage
5.0 V/cm
2 (12)
Trigger
6 (8)
Control
Capacitor Voltage
5.0 V/cm
3 (11)
Clock
Input
Modulation
Input
Gnd
7
t = 0.5 ms/cm
(R = 10 kW, C = 0.02 mF, V
= 15 V)
A
CC
Figure 24. Sequential Timing Circuit
V
(5.0 V to 15 V)
CC
9.1 k
27 k
9.1 k
27 k
50 k
Reset
V
Reset
V
Reset
V
CC
CC
CC
0.01 µF
0.01
µF
0.01
µF
Threshold
Threshold
Threshold
Discharge
Control
Control
Control
Discharge
Trigger
Discharge
Trigger
1/2
MC3456
1/2
MC3456
1/2
MC3456
Output
Output
Output
0.001
µF
0.001 µF
Trigger
Gnd
Gnd
Gnd
1.0 µF
5.0
µF
5.0 µF
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.
14
1
8
7
B
INCHES
MILLIMETERS
A
F
DIM
A
B
C
D
F
G
H
J
K
L
M
N
MIN
MAX
0.770
0.260
0.185
0.021
0.070
MIN
18.16
6.10
3.69
0.38
1.02
MAX
19.56
6.60
4.69
0.53
1.78
0.715
0.240
0.145
0.015
0.040
L
C
0.100 BSC
2.54 BSC
0.052
0.008
0.115
0.095
0.015
0.135
1.32
0.20
2.92
2.41
0.38
3.43
J
N
0.300 BSC
7.62 BSC
SEATING
PLANE
K
0
10
0
10
0.015
0.039
0.39
1.01
H
G
D
M
D SUFFIX
PLASTIC PACKAGE
CASE 751–05
(SO–14)
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.
–A–
ISSUE N
8
1
5
4
4X P
–B–
M
M
0.25 (0.010)
B
MILLIMETERS
INCHES
G
DIM
A
B
C
D
MIN
4.80
3.80
1.35
0.35
0.40
MAX
5.00
4.00
1.75
0.49
1.25
MIN
MAX
0.196
0.157
0.068
0.019
0.049
0.189
0.150
0.054
0.014
0.016
R X 45
F
C
F
SEATING
G
J
K
M
P
R
1.27 BSC
0.050 BSC
–T–
PLANE
0.18
0.10
0
0.25
0.25
7
0.007
0.004
0
0.009
0.009
7
K
J
M
8X D
0.25 (0.010)
M
S
S
5.80
0.25
6.20
0.50
0.229
0.010
0.244
0.019
T
B
A
9
MOTOROLA ANALOG IC DEVICE DATA
MC3456
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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
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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
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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
JAPAN: Nippon Motorola Ltd.; Tatsumi–SPD–JLDC, 6F Seibu–Butsuryu–Center,
3–14–2 Tatsumi Koto–Ku, Tokyo 135, Japan. 03–81–3521–8315
MFAX: RMFAX0@email.sps.mot.com – TOUCHTONE 602–244–6609
INTERNET: http://Design–NET.com
ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park,
51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852–26629298
MC3456/D
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