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Part Number: SN74ALS869 According to the drawing of the internal logic diagram for 74ALS869, S0 must be 0 in order to activate the 3-inputs NAND, together with ENT# and ENP# for counting up/down mode.
But input S0 is required to be 1 for counting UP/DOWN…
Hi,
If you're looking for something functionally equivalent, try looking at the SN74AS867 or the SN74ALS867A.
Unfortunately, these devices won't be able to support 3.3V like the HC device can.
Thanks!
Chad Crosby