SCLA043 April 2021 SN74HC00
3 Voltage Translation for Wireless Interface Modules
It is common to see asset trackers utilizing wireless interface modules. These modules often use UART for communication, and commonly are operating at a different logic voltage level from the primary system controller. The addition of a voltage level translator protects low-power system controllers and ensures accurate communication to the peripheral module.
Figure 3-1 Example 2-wire UART Voltage
Translation Block DiagramSee more about this use case in the Logic Minute video Voltage Level Translation for UART Interface
- Some devices support up to 5 Mbps UART communication; most are limited to 115 kbps or less
- Translators enable communication when devices have mismatched logic voltage levels
- Prevent damage to devices that cannot support higher voltage inputs
- Improve data rates over discrete translation solutions
- Protect controller while peripheral is not connected
- [FAQ] How does a slow or floating input affect a CMOS device?
- Need additional assistance? Ask our engineers a question on the TI E2E? Logic Support Forum
| Part Number | Automotive Qualified | Voltage Translation Range | Features |
|---|---|---|---|
| SN74AXC2T245-Q1 | ? | 0.65 V — 3.6 V | Glitch-free power supply sequencing Outputs are disabled when either supply is 0 V Active translation architecture |
| SN74AXC2T245 | |||
| TXB0102 | 1.2 V — 3.6 V to 1.65 V— 5.5 V |
Auto-bidirectional Active translation architecture |
|
| TXS0102-Q1 | ? | 1.2 V — 3.6 V to 1.65 V— 5.5 V |
Auto-bidirectional Internal pull-up resistors Passive translation architecture |
For more devices, browse through the online parametric tool where you can sort by desired voltage, channel numbers, and other features.