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https://e2e.ti.com/support/logic-group/logic/f/logic-forum/720528/sn74ls244-what-does-the-e4-at-the-end-of-the-part-number-mean
SN74LS244N 与 SN74LS244NE4有何区别？ 器件型号末尾的"E4"是什么意思？
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感谢您的支持、
John
