The MC74VHC1G125 / MC74VHC1GT125 is a single non−inverting 3−state buffer in tiny footprint packages. The MC74VHC1G125 has CMOS−level input thresholds while the MC74VHC1GT125 has TTL−level input thresholds. The internal circuit is composed of three stages, including a buffered 3−state output which provides high noise immunity and stable output. The input structures provide protection when voltages up to 5.5 V are applied, regardless of the supply voltage. This allows the device to be used to interface 5 V circuits to 3 V circuits. Some output structures also provide protection when VCC = 0 V and when the output voltage exceeds VCC. These input and output structures help prevent device destruction caused by supply voltage − input/output voltage mismatch, battery backup, hot insertion, etc.
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