ICM7555IB Datasheet

Timers & Support Products


The ICM7555IB and ICM7556 are CMOS RC timers providingsignificantly improved performance over the standardSE/NE 555/6 and 355 timers, while at the same time beingdirect replacements for those devices in most applications.Improved parameters include low supply current, wideoperating supply voltage range, low THRESHOLD,TRIGGER and RESET currents, no crowbarring of thesupply current during output transitions, higher frequencyperformance and no requirement to decouple CONTROLVOLTAGE for stable operation.Specifically, the ICM7555 and ICM7556 are stablecontrollers capable of producing accurate time delays orfrequencies. The ICM7556 is a dual ICM7555, with the twotimers operating independently of each other, sharing onlyV+ and GND. In the one shot mode, the pulse width of eachcircuit is precisely controlled by one external resistor andcapacitor. For astable operation as an oscillator, the freerunning frequency and the duty cycle are both accuratelycontrolled by two external resistors and one capacitor. Unlikethe regular bipolar SE/NE 555/6 devices, the CONTROLVOLTAGE terminal need not be decoupled with a capacitor.The circuits are triggered and reset on falling (negative)waveforms, and the output inverter can source or sinkcurrents large enough to drive TTL loads, or provide minimaloffsets to drive CMOS loads. ICM7555IB Features • Exact Equivalent in Most Cases for SE/NE555/556 orTLC555/556• Low Supply Current- ICM7555. . . . . 60μA- ICM7556. . . . . 120μA• Extremely Low Input Currents . . . . . 20pA• High Speed Operation . . . . . . 1MHz• Guaranteed Supply Voltage Range . . . . . . 2V to 18V• Temperature Stability . . . . . 0.005%/°C at +25°C• Normal Reset Function - No Crowbarring of Supply DuringOutput Transition• Can be Used with Higher Impedance Timing Elementsthan Regular 555/6 for Longer RC Time Constants• Timing from Microseconds through Hours• Operates in Both Astable and Monostable Modes• Adjustable Duty Cycle• High Output Source/Sink Driver can Drive TTL/CMOS• Outputs have Very Low Offsets, HI and LO• Pb-Free Plus Anneal Available (RoHS Compliant) ICM7555IB Applications • Precision Timing• Pulse Generation• Sequential Timing• Time Delay Generation• Pulse Width Modulation• Pulse Position Modulation• Missing Pulse Detector


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