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https://e2e.ti.com/support/logic-group/logic/f/logic-forum/1211136/sn74hc164-sn74hc164-output-current
SN74HC164 GPIO 端口输出电流是多少？
e2e.ti.com/.../sn74hc164.pdf
可在 VOL/VOH 测试条件中找到保证输出电压的最大电流。 您可以尝试消耗更高的电流、达到25mA 的绝对最大额定值、但随后可能没有为负载留出足够的电压。
