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贴片直插SN74LS283DR2G，SN74LS280ML1G，SN74LS280ML2G，4
贴片直插SN74LS293DR2，SN74LS280ML2，SN74LS283ML1，4
贴片直插SN74LS290DR2，SN74LS280ML1，SN74LS283MEL，4
贴片直插SN74LS283ML2，SN74LS280MEL，SN74LS283DR2，4
