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AM26LS31和AM26LS32的共地问题

Other Parts Discussed in Thread: AM26LS31

请问用AM26LS31和AM26LS32在不同设备之间连接,那么这两个芯片的供电电源要不要共地?为什么即使没有共地,只是把两个差分信号连接起来也能正常工作?