MC1555

MC1455 MC1555 Specifications and Applications Information I 4 TIMING CIRCUIT The MC1555/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 of operation, the 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. q q q q q q Direct Replacement Timing operates Adjustable for NE555/SE555 Through Timers Hours Modes From Microseconds in Both Astable and Monostable Duty Cycle High Current Output Can Source or Sink 200 mA output Can Drive MTTL ~,.y! ,7*2 > a *Y$ ,. ,.,*$~\., *tl~i;. ~ .i,;.,x..$.*:. $:?, . ‘s. .>,. ‘, i\.. ‘..,, .Meiti:l’ ‘?>, ~,?,~y:.x$:+ ,,.}:+*:,, !$.!l ,t . METAL PACKAGE CASE 601-04 1. 2. 3. 4. Ground Trigger output Reset 5. 6. 7. 8. Control Voltage Threshold Discharge Vcc 8 n 1 (Top View) 5 4 PI SUFFIX PLASTIC PACKAGE CASE 626-04 (MC1455P1 only) U SUFFIX CERAMIC PACKAGE CASE 693-02 F* ~ Ik 1 V D SUFFIX PLASTIC PACKAGE s f.! ~ >~~ ~ Threshold Control Voltage 5 Vcc ~8 5k 7 _A 5k Trigger 2 5k 7 Gn~ 1 ‘4 Reset _B s Inhibiti Reset output MCI 455G MC1455P1 MC1455D Mc...