Analog Multiplexer Dual 4:1 18-Pin PDIP N

The MAX388 8-channel single-ended (1-of-8) and the MAX389 4-channel differential (2-of-8) multiplexers (muxes) with internal data latches use a high-voltage series N-channel, P-channel, N-channel structure that significantly improves fault protection over previous devices. If power is removed with input voltages still applied, all channels turn off, allowing only a few nanoamperes of input leakage current. This protects the mux and output circuitry, as well as the signal sources connected to the channel inputs. When an overvoltage signal up to ±100V (typically ±110V) is applied to an analog input or output, the channel turns off. To further protect output circuitry from on-channel overvoltage, outputs are clamped to less than the power-supply voltage. Since there is no increase in supply current during fault conditions, power dissipation does not increase. The MAX388/MAX389 withstand full over-voltage on any combination of channels, including all channels simultaneously.All channel selection and control inputs are TTL and CMOS compatible. And, break-before-make switch operation is guaranteed.

• Fault and Over voltage Protection
• Fall-Safe with Power Loss (No Latch up)
• Break-Before-Make Switching
• All Channels Off when Power Off
• Internal Data Latches
• TTL and CMOS Compatible
• Operates from ±4.5V to ±18V Supplies
• On-Channels Turn Off during Overvoltage
• Nano amperes Leakage in Overvoltage