Apr 25, 2012 #1 neazoi Advanced Member level 6 Joined Jan 5, 2008 Messages 4,123 Helped 13 Reputation 26 Reaction score 15 Trophy points 1,318 Location Greece Activity points 36,955 74ls240, how to enable all outputs permanently? where should I connect 1G and 2G ?
Apr 25, 2012 #2 mister_rf Advanced Member level 5 Joined Feb 26, 2008 Messages 1,870 Helped 1,040 Reputation 2,088 Reaction score 953 Trophy points 1,393 Location Romania Activity points 11,515 Need to connect the 1G and 2G to a low level, see the datasheet: https://www.sfu.ca/phys/430/datasheets/74LS240.pdf
Need to connect the 1G and 2G to a low level, see the datasheet: https://www.sfu.ca/phys/430/datasheets/74LS240.pdf
Apr 25, 2012 #3 neazoi Advanced Member level 6 Joined Jan 5, 2008 Messages 4,123 Helped 13 Reputation 26 Reaction score 15 Trophy points 1,318 Location Greece Activity points 36,955 mister_rf said: Need to connect the 1G and 2G to a low level, see the datasheet: https://www.sfu.ca/phys/430/datasheets/74LS240.pdf Click to expand... Yes at this datasheet is correct. But have a look at this one https://www.google.gr/url?sa=t&rct=...hK3FBg&usg=AFQjCNFxJwPmJA0scK13z2rkmDUDvfbKyw In this datasheet the one enable is normal and the other is bar. Which one is correct?
mister_rf said: Need to connect the 1G and 2G to a low level, see the datasheet: https://www.sfu.ca/phys/430/datasheets/74LS240.pdf Click to expand... Yes at this datasheet is correct. But have a look at this one https://www.google.gr/url?sa=t&rct=...hK3FBg&usg=AFQjCNFxJwPmJA0scK13z2rkmDUDvfbKyw In this datasheet the one enable is normal and the other is bar. Which one is correct?
Apr 25, 2012 #4 FoxyRick Advanced Member level 4 Joined Jan 8, 2004 Messages 1,249 Helped 321 Reputation 640 Reaction score 277 Trophy points 1,373 Location England, UK Activity points 12,979 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
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
Apr 25, 2012 #5 neazoi Advanced Member level 6 Joined Jan 5, 2008 Messages 4,123 Helped 13 Reputation 26 Reaction score 15 Trophy points 1,318 Location Greece Activity points 36,955 FoxyRick said: 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 Click to expand... Ok so I will tie them both to GND, to make the chip always enabled! Thank you very much!
FoxyRick said: 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 Click to expand... Ok so I will tie them both to GND, to make the chip always enabled! Thank you very much!