Communication between any two devices occur when a signal is sent from the output of one device to the input of the interfacing device; the core device and the peripheral devices, however, might be operating at different voltage levels, which is why a level shifter is needed in between them to facilitate the communication. If the required signals are not shifted to the voltage at which the core device is operating, then the reliability of communication is impacted. The 2N7001T provides a good solution for voltage translating common control I/O signals such as enable or restart. Figure 2-1 shows how the clock buffering, power good, error flag, reset, memory error, processor overheat, LED, and display driving are other common signal types that often need level shifting.

Figure 2-1 Driving LED with Translation Using 2N7001T