General description

The ICM7555 is a CMOS timer providing significantly improved performance over the standard NE/SE555 timer, while at the same time being a direct replacement 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.

The ICM7555 is a stable controller capable of producing accurate time delays or frequencies.

Features

■ Exact equivalent in most applications for NE/SE555

■ Low supply current: 80 µA (typical)

■ Extremely low trigger, threshold, and reset currents: 20 pA (typical)

■ High-speed operation: 500 kHz guaranteed

■ Wide operating supply voltage range guaranteed 3 V to 16 V over full automotive temperatures

■ Normal reset function; no crowbarring of supply during output transition

■ Can be used with higher-impedance timing elements than the NE/SE555 for longer 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

■ Typical temperature stability of 0.005 / °C at 25 °C

■ Rail-to-rail outputs

Applications

■ Precision timing

■ Pulse generation

■ Sequential timing

■ Time delay generation

■ Pulse width modulation

■ Pulse position modulation

■ Missing pulse detector