SN74LVC1T45-Q1: VCC and I/O signal

Liu Yang

Part Number: SN74LVC1T45-Q1

Hi Team,

When VCCB is on and VCCA is off, if signal input to VCCA side I/O A, is there any problem?
When both VCCA and VCCB is on, if VCCA=1.8V while 3.3V signal input to VCCA side I/O A, is there any problem?

Beat Regards,
Tom Liu

over 3 years ago

+1 Clemens Ladisch over 3 years ago

Guru 317060 points

There are no problems in either case. This device has the V_CC Isolation Feature (see the datasheet) and overvoltage-tolerant inputs (see [FAQ] Can the input voltage (Vi) to my logic device be higher than the supply voltage (Vcc)?).

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SN74LVC1T45-Q1: VCC and I/O signal