SCEA135 june 2023 TXB0101 , TXB0102 , TXB0104 , TXB0104-Q1 , TXB0106 , TXB0106-Q1 , TXB0108 , TXB0302 , TXB0304 , TXS0101 , TXS0101-Q1 , TXS0102 , TXS0102-Q1 , TXS0104E , TXS0104E-Q1 , TXS0108E , TXS0108E-Q1
Auto Directional level shifter families are designed with weaker outputs than devices from other level shifting families, to be easily overdriven by the hosts. This makes Auto Direction devices a requirement for bidirectional interfaces such as I2C, MDIO, Quad-SPI, and so on.
The TXS and TXB Auto Directional level shifter families as shown in Voltage Translators and Level Shifters are designed with edge rate accelerators (commonly known as one-shots). The one-shots are designed for a set duration of pulse width for optimal signal integrity, impacted by RC components. Therefore, intentional and careful considerations should be made when used with additional external components as majority of one-shot concerns are due to improper use of the devices, false triggering of the one-shots and poor layout design.
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Texas Instruments’ portfolio of level shifter devices contains many different types of level translation functions that collectively is able to address almost any application requirement. TI’s level translation portfolio includes Auto Directional, Direction Controlled, Fixed Direction, and Application Specific Level Translators in Industrial and Automotive ratings. For a list of recommended level translation devices for common interface types please see Table 1-1. For more information on all of TI’s level translation designs please visit TI’s level translation landing page at www.ti.com/translation.
Translation Level | ||
---|---|---|
Interface | Up to 3.6 V | Up to 5.5 V |
FET Replacement | 2N7001T | SN74LXC1T45 / TXU0101 |
1 Bit GPIO/Clock Signal | SN74AXC1T45 | SN74LXC1T45 / TXU0101 |
2 Bit GPIO | SN74AXC2T245 | SN74LXC2T45 / TXU0102 |
2-Pin JTAG/UART | SN74AXC2T45 | SN74LXC2T45 / TXU0202 |
I2C/MDIO/SMBus | TXS0102 / LSF0102 | TXS0102 / LSF0102 |
IC-USB | SN74AVC2T872 / TXS0202 | NA |
4 Bit GPIO | SN74AXC4T245 | TXB0104 / TXU0104 |
UART | SN74AXC4T245 | TXU0204 |
SPI | SN74AXC4T774 | TXU0304 |
JTAG | SN74AXC4T774 | TXU0304 |
I2S/PCM | SN74AXC4T774 / TXB0104 | TXB0104 / TXU0204 |
Quad-SPI | TXB0106 | TXB0106 |
SDIO/SD/MMC | TXS0206 / TWL1200 | NA |
8 Bit GPIO/RGMII | SN74AXC8T245 | SN74LXC8T245 |