NTE74LS221
Description
: The NTE74LS221 is a monolithic dual multivibrator in a 16- Lead plastic DIP type package with performance characteristics virtually identical to those of the NTE74121. Each multivibrator features a negative- transition- triggered input and a positive- transition- triggered input either of which can be used as an inhibit input. Pulse triggering occurs at a particular voltage level and is not directly related to the transition time of the input pulse. Schmitt- trigger input circuitry (TTL hysteresis) for B input allows jitter- free triggering from inputs with transition rates as slow as 1 volt/second, providing the circuit with excellent noise immunity of typically 1.2 volts. A high immunity to VCC noise of typically 1.5V is also provided by internal latching circuitry. Once fired, the outputs are independent o further transitions of the A an B inputs and are a function of the timing ponents, or the output pulses can be terminated by the overriding clear. Input pulses may be of...
