December 1990 6
Philips Semiconductors Product speciļ¬cation
Presettable synchronous 4-bit binary
up/down counter
74HC/HCT191
Fig.5 N-stage ripple counter using ripple clock.
Fig.6 Synchronous n-stage counter using ripple carry/borrow.
Fig.7 Synchronous n-stage counter with parallel gated carry/borrow.
