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Yes at this datasheet is correct. But have a look at this one https://www.google.gr/url?sa=t&rct=...hK3FBg&usg=AFQjCNFxJwPmJA0scK13z2rkmDUDvfbKywNeed to connect the 1G and 2G to a low level, see the datasheet:
https://www.sfu.ca/phys/430/datasheets/74LS240.pdf
Looks like a mistake in that datasheet (bad Motorola!). Check the truth table on the following page though - it tells the truth.
The '240 has both active low enables.
Also check TI's - it is correct:
www.ti.com/lit/ds/symlink/sn74ls244.pdf