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SN74HC573A: Output 3 State Question

Part Number: SN74HC573A

Hi,

When OE=H, the output is Z. I connected a 30Kohm resistor in each output pin and measure the voltages on the output pins, the voltages from out 1~8 are different, pin1=4.2V, pin2=4.1V, pin3=3.2V, pin4=0.5V, .... do you know why? Thanks.