M74HC123
DESCRIPTION
The M74HC123 is an high speed CMOS c MONOSTABLE MULTIVIBRATOR fabricated with u silicon gate C2MOS technology. d There are two trigger inputs, A INPUT (negative ro edge) and B INPUT (positive edge). These inputs P are valid for slow rising/falling signals, (tr=tf=l sec). te The device may also be triggered by using the
CLR input (positive-edge) because of the le Schmitt-trigger input; after triggering the output o maintains the MONOSTABLE state for the time Obs PIN CONNECTION AND IEC LOGIC SYMBOLS
TSSOP
ORDER CODES
PACKAGE
TUBE
DIP SOP TSSOP
M74HC123B1R M74HC123M1R
T&R
M74HC123RM13TR M74HC123TTR period determined by the external resistor Rx and capacitor Cx. When Cx > 10n F and Rx > 10KΩ, the output pulse width value is approsimatively given by the formula : t W(OUT) = K
- Cx
- Rx. (K ≅ 0.45). Taking CLR low breaks this MONOSTABLE STATE. If the next trigger pulse occurs during the MONOSTABLE period it makes the MONOSTABLE period longer. Limit for values of...
