MM54C221

· Wide supply voltage range 4.5V to 15V
· Guaranteed noise margin 1.0V
· High noise immunity 0.45 V_CC (typ.)
· Low power TTL compatibility fan out of 2 driving 74L

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications.

The MM54C221/MM74C221 dual monostable multivibrator is a monolithic complementary MOS integrated circuit. Each multivibrator features a negative-transition-triggered input and a positive-transition-triggered input, either of which can be used as an inhibit input, and a clear input.

Once fired, the output pulses are independent of further transitions of the A and B inputs and are a function of the external timing components C_EXT and R_EXT. The pulse width of MM54C221 is stable over a wide range of temperature and V_CC.

Pulse stability of MM54C221 will be limited by the accuracy of external timing components. The pulse width is approximately defined by the relationship t_W(OUT) C_EXT R_EXT. For further information and applications, see AN-138.