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贴片直插SN74LS640MR1G，SN74LS640DWR2，SN74LS640ML2G，4
SN74LS640MR1【BUS TRANSCEIVER, LS SERIES TTL】
贴片直插SN74LS645-1N SN74LS640MR1 SN74LS641DWG 4
