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寻找 单一电源3.3V供电，由TTL（5V）转成3.3V的芯片？？？，准备接入单片机msp430系列的IO口。单片机dvcc=3.3v
或者相应电路
如果仅是单向5V到3.3V可以选用 SN74LVC245A，
如果是双向只能选用双电源supply 的芯片。
