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MAX3221CPWRG4太贵了，有没有哪个便宜的芯片能够代替呢？
要求3.3V供电和3.3V上拉，一路TX,一路RX ,贴片封装
到这个链接下。search一下
http://www.ti.com/lsds/ti/interface/rs-232-overview.page
便宜点儿的，跟MAX3221功能相同的，可以替换的可看下TRS3221。
