Dual Retriggerable Monostable Multivibrators
The 'LS422 and 'LS423 are identical to 'LS122 and 'LS123 except they cannot be triggered via clear.
These d-c triggered multivibrators feature output-pulse-width control by three methods. The basic pulse time is programmed by selection of external resistance and capacitance values (see typical application data). The 'LS422 contains an internal Timing resistor that allows the circuits to be used with only an external capacitor, if so desired. Once triggered, the basic pulse width may be extended by retriggering the gated low-level-active (A) or high-level-active (B) inputs, or be reduced by use of the overriding clear. Figure 1 illustrates pulse control by retriggering and early clear.
The 'LS422 and 'LS423 have enough Schmitt hysteresis to ensure jitter-free triggering from the B input with transition rates as slow as 0.1 millivolt per nanosecond. The 'LS422 Rint is nominally 10 k ohms.
The SN54LS422 and SN54LS423 are characterized for operation over the full military temperature range of -55C to 125C. The SN74LS422 and SN74LS423 are characterized for operation from 0C to 70C.FIGURE 1-TYPICAL INPUT/OUTPUT PULSES
By Texas Instruments
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