R56.93

The ICM7556 is a dual CMOS RC timer providing significantly improved performance over the standard SE/NE555/6 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 ICM7556 is a stable controller capable of producing accurate time delays or frequencies.

The two timers operate 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 ccurately controlled by two external resistors and one capacitor. Unlike the regular bipolar 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 Include
Exact Equivalent in Most Cases for SE/NE555/556 or TLC555/556
ow Supply Current: 120μA
Extremely Low Input Currents: 20pA
High Speed Operation: 1MHz
Guaranteed Supply Voltage Range: 2V to 18V
Temperature Stability: 0.005%/oC at 25°C
Normal Reset Function - No Crowbarring of Supply During Output Transition
Can be Used with Higher Impedance Timing Elements than 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

Applications Include
Precision Timing
Pulse Generation
Sequential Timing
Time Delay Generation
Pulse Width Modulation
Pulse Position Modulation
Missing Pulse Detector

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