Automotive

Digital demultiplexers for GPIO expansion and decoding

Digital decoders / demultiplexers enable interface bus width reduction

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Key features and benefits

  • Simple control interface
  • I/O expansion
  • Multiple input enable for easy expansion or independent controls
  • Integrated input latch to store the address of decoders lines
  • Ideal for memory chip select decoding
  • Asynchronous and synchronous load options
  • Overvoltage tolerant input options
  • Inverting and non-inverting output options
  • 3-state outputs
  • High frequency
  • Can be cascaded
  • AEC Q100 grade

Key applications

  • Selection of memory banks and peripherals in display clusters
  • I/O expansion for Infotainment CODECs
  • Implementation of lane departure warning systems

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Descriptive summary

NXP's demultiplexers are available in multiple logic families with 1, 2, 3 and 4 input lines and 2, 4, 8 and 16 output lines reducing the bit width of interface busses. They can be used as decoders by activating one of serveral mutually-exclusive output lines, based on the digital code present at the binary-weighted inputs. A typical use of decoders is in memory addressing in automotive applications such as display clusters, global positioning systems and keyless entry systems; allowing several memory devices to share a common data bus by ensuring that only one memory device is enabled at a time.

Digital decoders / demultiplexers are available in standard SO, TSSOP and leadless DQFN packages for PCB space saving. NXP's automotive digital decoders / demultiplexers are fully specified from -40°C to 125°C, and qualified per AEC Q100 grade 1.

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