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我的板子要过群脉冲,能不能使用SN74HC595

Other Parts Discussed in Thread: SN74HC595, SN65HVD888

我的板子要过群脉冲(5KHZ,4KV),之前的板子使用595,打脉冲时,595控制的继电器乱跳,示波器观察是因为MCU与595的通信线上有杂波,但通信线上已经做了RC滤波处理,用的是100R,1nF。请问是不是595的抗干扰能力差,不适合我的板子。还是通信方面可以再做处理?

我需要扩展IO,不用595的话,用什么芯片?