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SN65HVS881 56欧电阻烧坏

Other Parts Discussed in Thread: SN65HVS881

您好,我是按照SN65HVS881的datasheet里的原理图做的PCB,发现接入24V电源后,56欧电阻冒烟了,我拿掉56欧电阻后,测了下电流,发现24V的全部电流都加在了56欧电阻上,但是SN65HVS881芯片还是好的,请问为什么会出现这种情况?我用的是24V 250mA的电源。奇怪的是在另一个同事做的板子上都是好用的,难道是PCB的原因吗?