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HD74HCT244RP HD74HCT244RPEL HD74HCT244-RPVEL HD74HCT244T-EL HD74HCT244TELL HD74HCT244TELL TSSOP20 HD74HCT244TELL-E HD74HCT244TVEL HD74HCT244TVELL HD74HCT244TVELL-E