ICs that can convert the voltage level of logic signals include general-purpose logic ICs (with tolerant function and TTL input) and dual-power level shifter ICs (buffer type, bus switch type) dedicated to voltage level conversion. (table 1)
A brief description of each is given below.
Refer to the application note below for the selection of the level shifter.
→ Tips for Selecting Level Shifters(Voltage Translation ICs) (PDF:2.62MB)
Supply Voltage |
Circuit Type |
Up |
Down |
|
---|---|---|---|---|
Fig. 1 |
Single Supply |
Buffer |
✔ (TTL-Input : 3.3 V→5 V) |
✔ (Tolerant : 5 V→3.3 V) |
Fig. 2 |
Dual Supply |
Buffer |
✔ (VCCA → VCCB) |
✔ (VCCB → VCCA) |
Fig. 3 |
Dual Supply |
SW |
✔ (VCCA → VCCB) |
✔ (VCCB → VCCA) |
*1: The VCX series allows down translation from 3.3 V to 1.8 V since it is designed for low-voltage applications operating at 3.6 V or less.
The following documents also contain related information.