MC3456
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.
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DUAL TIMING CIRCUIT
SEMICONDUCTOR
TECHNICAL DATA
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Direct Replacement for NE556/SE556 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
Dual Version of the Popular MC1455 Timer
P SUFFIX
PLASTIC PACKAGE
CASE 646
1.0 k
MT2
3
10 k
5
0.01
μF
4
2
8
1/2
MC3456
1
6
7
1.0
μF
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
D SUFFIX
PLASTIC PACKAGE
CASE 751A
(SO−14)
0.1
μF
1N4003
−
10
μF
+
PIN CONNECTIONS
Discharge A
Threshold A
Control A
Reset A
Output A
Trigger A
Gnd
1
2
3
4
5
6
7
14
13
12
11
10
9
8
V
CC
Discharge B
Threshold B
Control B
Reset B
Output B
Trigger B
Figure 1. 22 Second Solid State Time Delay Relay Circuit
(Top View)
ORDERING INFORMATION
Device
MC3456P
NE556D
Operating
Temperature Range
0° to +70°C
Package
Plastic DIP
SO−14
©
Semiconductor Components Industries, LLC, 2006
July, 2006
−
Rev. 4
1
Publication Order Number:
MC3456/D
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