Описание
The MAX358 is an 8 channel single-ended (1 of 8) multiplexer with fault protection. Using a series N-channel, P-channel, N-channel structure, this multiplexer provides significantly improved fault protection. If the power supply to the MAX358 is inadvertently turned off while input voltage is still applied, all channels in the multiplexer are turned off, and only a few nanoamperes of leakage current will flow into the input. This protects not only the multiplexer and the circuitry driven by the multiplexer, but also protects the sensors or signal sources which drive the MAX358. The Maxim series N-channel, P-channel, N-channel protection structure has two significant advantages. First the Maxim protection scheme limits fault currents to nanoamp leakage values. This prevents damage to sensors or other sensitive signal sources. Second, the MAX358 can withstand a continuous ±35V overvoltage, imposed by power dissipation considerations. The digital inputs have logic thresholds of 0.8V and 2.4V, ensuring both TTL and CMOS compatibility without requiring pullup resistors. Break-before-make operation is guaranteed. Power supply currents have been reduced and typical power dissipation is less than 2 milliwatts.
