The ICM7555 and ICM7556 are CMOS RC timers providing significantly improved performance over the standard SE/NE 555/6 and 355 timers, while at the same time being direct replacements for those devices in most applications. Improved parameters include low supply current, wide operating supply voltage range, low THRESHOLD, TRIGGER and RESET currents, no crowbarring of the supply current during output transitions, higher frequency performance and no requirement to decouple CONTROL VOLTAGE for stable operation. Specifically, the ICM7555 and ICM7556 are stable controllers capable of producing accurate time delays or frequencies. The ICM7556 is a dual ICM7555, with the two timers operating independently of each other, sharing only V+ and GND. In the one shot mode, the pulse width of each circuit 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 by two external resistors and one capacitor. Unlike the regular bipolar SE/NE 555/6 devices, the CONTROL VOLTAGE 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 sink currents large enough to drive TTL loads, or provide minimal offsets to drive CMOS loads.
Features
Exact Equivalent in Most Cases for SE/NE555/556 or TLC555/556
Low Supply Current
Extremely Low Input Currents
High Speed Operation
Guaranteed Supply Voltage Range
Temperature Stability: 0.005%/°C at +25°C
Normal Reset Function - No Crowbarring of Supply During Output Transition
Can be Used with Higher Impedance Timing Elementsthan Regular 555/6 for Longer RC Time Constants
