Datasheet

ManualsBrandsNXP ManualsCounters4 Bit Binary Up / Down Counter PDIP 39MHz

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December 1990 7

Philips Semiconductors Product speciﬁcation

Presettable synchronous 4-bit binary

up/down counter

74HC/HCT191

Fig.8 Typical load, count and

inhibit sequence.

Sequence

Load (preset) to binary thirteen;

count up to fourteen, fifteen,

zero, one and two;

inhibit;

count down to one, zero, fifteen,

fourteen and thirteen.

Fig.9 Logic diagram.