HD74LS221P Datasheet | Renesas

HD74LS221 Dual Monostable Multivibrators REJ03D0458- 0300 Rev.3.00 Jul.15.2005 This 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 V/s, providing the circuit with excellent noise immunity of typically 1.2 V. A high immunity to VCC noise of typically 1.5 V is also provided by internal latching circuitry. Once fired, the outputs are independent of further transitions of the A and 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 any duration relative to the output pulse. Output rise and fall times are TTL patible and independent of pulse length. Typical triggering and clearing sequence are illustrated as a part of the switching characteristics waveforms. Pulse width stability is achieved through internal pensation and is virtually independent of VCC and temperature. In most applications, pulse stability will only be limited by the accuracy of external timing ponents. Jitter-free operation is maintained over the full temperature and VCC range for more than six decades of timing capacitance (10 p F to 10 µF) and more than one decade of timing resistance (2 kΩ to 100 kΩ). Throughout these ranges, pulse width is defined by the relationship: tw (out) = Cext - Rext - 1n 2. Features - Ordering Information Part Name Package Type Package Code (Previous Code) Package Abbreviation DILP-16 pin PRDP0016AE-B (DP-16FV) HD74LS221RPEL SOP-16 pin (JEDEC) PRSP0016DG-A (FP-16DNV) Note: Please consult the sales office for the above package availability. Taping Abbreviation (Quantity) - EL...