The MC1455 silicon
monolithic timing circuit is a highly stable controller capable of
producing accurate time delays, or oscillation. In the time delay mode
of operation, the time is precisely controlled by one external resistor
and capacitor. For a stable 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.
22-Second solid-state time delay relay
circuit
Features:
Turn off time less
than 2 micro seconds.
Maximum operating
frequency greater than 500KHz.
Timing from
microseconds to hours.
Operates in both
astable and monostable modes.
High output current.
Adjustable
duty-cycle.
TTL compatible.
Temperature stability
of 0.005% per °C.
Rise and Fall times
of output is 100nS typical.
Normally "on" or
normally "off".
Output can also drive
MTTL circuits.
Direct pin-compatible
with the LM555 & NE555 timers.
Some
Applications:
Block Diagram
Precision Timing.
Pulse generation.
Sequential timing.
Timedelay generation.
Pulse width
modulation.
Pulse position
modulation.
Missing Pulse
Detector.
Absolute Maximum
Ratings:
Supply voltage for
MC1455 is +18 volt.
Discharge current
(pin 7) is 200mA.
Power dissipation 680
milliWatts.
Operating temperature
range for MC1455G, MC1455P1, NE555V, MC1455D, and MC1455U are 0°C to
+70°C. For MC1455BP1 is that -40°C to +85°C
Storage temperature
range from -65 to -150 °C.
Lead temperature
(soldering, up to 60 sec) 300 °C.
Suffix's:
The 'G' suffix (e.i.
MC1455G) stands for Metal package (can), case 601-04.
The 'P1' suffix
stands for Plastic package (the most common), case 626-05.
The 'U' suffix stands
for Ceramic package (mostly used in the Industry), case 693-02.
The 'L' suffix stands
for Ceramic package (mostly used in the Industry), case 632-08.
The 'D' suffix stands
for Surface Mount, Plastic package, case 751-02 or SO-8.
The 'D, N, or FE'
suffix can be found for the 8-pin dip packages.
The 'F' suffix is the
14 pin version of the 8-pin dip. Pins 2,5,7,9,11, and 13 are not
connected.
Notes:
Supply current when
output high typically 1mA or less.
Tested at Vcc=5V and
Vcc=15V.
This will determine
the maximum value of Ra+Rb, for 15V operation, the max total
R = 10 megohm, and for 5V operation, the max total of R = 3.4 megohm.
Specified with
trigger input high.
Time measured from a
positive going input pulse from 0 to 0.8 x Vcc into the threshold
to the drop from high to low of the output. Trigger is tied to
treshold.
