ADG508F Datasheet

• All switches off with power supply off
• Latch-up proof construction
• Low On Resistance (270 Ω typical)
• Fast Switching Times
  t_on 230 ns maximum
  t_off 130 ns maximum
• Analog output of on channel clamped within power supplies if an overvoltage occurs
• Low power dissipation (3.3 mW maximum)
• Fault and overvoltage protection (−40 V to +55 V)
• Break-before-make construction
• TTL and CMOS compatible inputs

• Existing multiplexer applications (both fault-protected and nonfault-protected)
• New designs requiring multiplexer functions

The ADG508F are CMOS analog multiplexers, with the ADG508F comprising eight single channels. These multiplexer provides fault protection. Using a series n-channel, p-channel, n-channel MOSFET structure, both device and signal source protection is provided in the event of an overvoltage or power loss. The multiplexer can withstand continuous overvoltage inputs from -40 V to +55 V. During fault conditions with power supplies off, the multiplexer input (or output) appears as an open circuit and only a few nanoamperes of leakage current will flow. This protects not only the multiplexer and the circuitry driven by the multiplexer, but also protects the sensors or signal sources that drive the multiplexer.

The ADG508F switches one of eight inputs to a common output as determined by the 3-bit binary address lines A0, A1 and A2. An EN input on each device is used to enable or disable the device. When disabled, all channels are switched OFF.