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Tell me about the devices suitable for use as level shifters.

There are three types of level shifters:

  1. Using single-voltage logic ICs (Figure 1)
    The single-supply level shift type provides voltage-level translation using a 5 V-tolerant input (for down translation) or a TTL-level input (for up translation). For details, please refer to “What options do I have to perform level shifting from 5 V to 3.3 V and vice versa?” in the Frequently Asked Questions (FAQ) page.
  2. Using dual-voltage logic ICs: level-shifting bus buffer type (Figure 2)
    The bus buffer type provides sufficient drive capability, making it suitable for high-speed level-shifting.
  3. Using dual-voltage logic ICs: level-shifting bus switch type (Figure 3)
    The bus switch type uses pullup resistors for level-shifting. It only transmits the signals from input to output and has no inherent drive capability.

For the difference between level-shifting bus switches and bus buffers, please refer to “What is the difference between a level-shifting bus switch type and a bus buffer type?” in the Frequently Asked Questions (FAQ) page.

Supply Voltage Circuit Type

Up
Translation

Down
Translation

1 Single Supply Buffer

Y

(TTL-Input)

Y

(Tolerant)

2 Dual Supply Buffer Y Y
3 Dual Supply SW

Y

(Pull-up)

Y
Figure1 Using single-voltage logic ICs

Figure1 Using single-voltage logic ICs

Figure2 Using dual-voltage logic ICs: level-shifting bus buffer type

Figure2 Using dual-voltage logic ICs: level-shifting bus buffer type

Figure3 Using dual-voltage logic ICs: level-shifting bus switch type

Figure3 Using dual-voltage logic ICs: level-shifting bus switch type

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