Hi Sir,
Customer used the SN75C1167 for the UART signal design, now they have made a testing method but they encountered a behavior but not sure it is abnormal or not.
They simple test the chip only, without any pcb and not connect the Vcc. Then input the UART signal on pin 15 (D) or pin 3 (R)... and they can observe the pin 16 will got the same signal... also the observe the Vcc got the voltage.
Would it be normal in our chip design? Because customer worried that should be the problem for their auto testing progress... please help to reconfirm it.
Thanks,
George