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Direction-controlled voltage translators

SN74AXC8T245

ACTIVE

8-bit dual-supply bus transceiver

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Data sheet

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NEW TXV0108-Q1 ACTIVE Automotive, dual-supply direction-controlled eight-channel voltage translator Improved timing specs such as rise/fall time, skew, and propagation delay.
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NEW TXV0106-Q1 ACTIVE Automotive dual-supply fixed-direction six-channel voltage translator 6 channel device with improved timing specs such as rise/fall time, skew, and propagation delay.

SN74AXC8T245

ACTIVE
Data sheet Order now

Product details

Technology family AXC Applications RGMII Bits (#) 8 High input voltage (min) (V) 0.455 High input voltage (max) (V) 3.6 Vout (min) (V) 0.65 Vout (max) (V) 3.6 Data rate (max) (Mbps) 380 IOH (max) (mA) -12 IOL (max) (mA) 12 Supply current (max) (µA) 55 Features Output enable, Overvoltage tolerant inputs, Partial power down (Ioff), Vcc isolation Input type Standard CMOS Output type 3-State, Balanced CMOS, Push-Pull Rating Catalog Operating temperature range (°C) -40 to 125
Technology family AXC Applications RGMII Bits (#) 8 High input voltage (min) (V) 0.455 High input voltage (max) (V) 3.6 Vout (min) (V) 0.65 Vout (max) (V) 3.6 Data rate (max) (Mbps) 380 IOH (max) (mA) -12 IOL (max) (mA) 12 Supply current (max) (µA) 55 Features Output enable, Overvoltage tolerant inputs, Partial power down (Ioff), Vcc isolation Input type Standard CMOS Output type 3-State, Balanced CMOS, Push-Pull Rating Catalog Operating temperature range (°C) -40 to 125
TSSOP (PW) 24 49.92 mm² 7.8 x 6.4 UQFN (RJW) 24 8 mm² 4 x 2 VQFN (RHL) 24 19.25 mm² 5.5 x 3.5
  • Qualified fully configurable dual-rail design allows each port to operate with a power supply range from 0.65V to 3.6V
  • Operating temperature from –40°C to +125°C
  • Multiple direction-control pins to allow simultaneous up and down translation
  • Up to 380Mbps support when translating from 1.8V to 3.3V
  • VCC isolation feature to effectively Isolate both buses in a power-down scenario
  • Partial power-down mode to limit backflow current in a power-down scenario
  • Compatible with SN74AVC8T245 and 74AVC8T245 level shifters
  • Latch-up performance exceeds 100mA per JESD 78, class II
  • ESD protection exceeds JESD 22
    • 8000-V human-body model
    • 1000-V charged-device model
  • Qualified fully configurable dual-rail design allows each port to operate with a power supply range from 0.65V to 3.6V
  • Operating temperature from –40°C to +125°C
  • Multiple direction-control pins to allow simultaneous up and down translation
  • Up to 380Mbps support when translating from 1.8V to 3.3V
  • VCC isolation feature to effectively Isolate both buses in a power-down scenario
  • Partial power-down mode to limit backflow current in a power-down scenario
  • Compatible with SN74AVC8T245 and 74AVC8T245 level shifters
  • Latch-up performance exceeds 100mA per JESD 78, class II
  • ESD protection exceeds JESD 22
    • 8000-V human-body model
    • 1000-V charged-device model

The SN74AXC8T245 device is an 8-bit non-inverting bus transceiver that resolves voltage level mismatch between devices operating at the latest voltage nodes (0.7V, 0.8V, and 0.9V) and devices operating at industry standard voltage nodes (1.8V, 2.5V, and 3.3V) and vice versa.

The device operates by using two independent power-supply rails (VCCA and VCCB) that operate as low as 0.65V. Data pins A1 through A8 are designed to track VCCA, which accepts any supply voltage from 0.65V to 3.6V. Data pins B1 through B8 are designed to track VCCB, which accepts any supply voltage from 0.65V to 3.6V.

The SN74AXC8T245 device is designed for asynchronous communication between data buses. The device transmits data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level of the direction-control inputs (DIR1 and DIR2). The output-enable (OE) input is used to disable the outputs so the buses are effectively isolated.

The SN74AXC8T245 device is designed so the control pins (DIR and OE) are referenced to VCCA.

This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs when the device is powered down. This inhibits current backflow into the device which prevents damage to the device.

The VCC isolation feature is designed so that if either VCC input supply is below 100mV, all level shifter outputs are disabled and placed into a high-impedance state.

To put the level shifter I/Os in the high-impedance state during power up or power down, tie OE to VCCA through a pullup resistor; the current-sinking capability of the driver determines the minimum value of the resistor.

The SN74AXC8T245 device is an 8-bit non-inverting bus transceiver that resolves voltage level mismatch between devices operating at the latest voltage nodes (0.7V, 0.8V, and 0.9V) and devices operating at industry standard voltage nodes (1.8V, 2.5V, and 3.3V) and vice versa.

The device operates by using two independent power-supply rails (VCCA and VCCB) that operate as low as 0.65V. Data pins A1 through A8 are designed to track VCCA, which accepts any supply voltage from 0.65V to 3.6V. Data pins B1 through B8 are designed to track VCCB, which accepts any supply voltage from 0.65V to 3.6V.

The SN74AXC8T245 device is designed for asynchronous communication between data buses. The device transmits data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level of the direction-control inputs (DIR1 and DIR2). The output-enable (OE) input is used to disable the outputs so the buses are effectively isolated.

The SN74AXC8T245 device is designed so the control pins (DIR and OE) are referenced to VCCA.

This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs when the device is powered down. This inhibits current backflow into the device which prevents damage to the device.

The VCC isolation feature is designed so that if either VCC input supply is below 100mV, all level shifter outputs are disabled and placed into a high-impedance state.

To put the level shifter I/Os in the high-impedance state during power up or power down, tie OE to VCCA through a pullup resistor; the current-sinking capability of the driver determines the minimum value of the resistor.
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Technical documentation

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Type Title Date
* Data sheet SN74AXC8T245 8-Bit Dual-Supply Bus Transceiver With Configurable Voltage Translation and Tri-State Outputs datasheet (Rev. C) PDF | HTML 30 Jan 2024
Application note Schematic Checklist - A Guide to Designing with Auto-Bidirectional Translators PDF | HTML 12 Jul 2024
Application note Understanding Transient Drive Strength vs. DC Drive Strength in Level-Shifters (Rev. A) PDF | HTML 03 Jul 2024
Application brief Enabling AI Accelerators with Voltage Level Translation PDF | HTML 01 May 2024
EVM User's guide TXV010xEVM Evaluation Module User's Guide PDF | HTML 05 Feb 2024
Application note Overcoming Design Challenges - Implementing High Performance Interfaces PDF | HTML 12 Dec 2023
Application brief Future-Proofing Your Level Shifter Design with TI's Dual Footprint Packages PDF | HTML 05 Sep 2023
Application brief Voltage Level Translation Use Cases for Smart Meters PDF | HTML 31 Jan 2023
Application brief Translate Voltages for RGMII (Rev. A) PDF | HTML 06 Aug 2021
EVM User's guide AXC Small-Package Evaluation Module User's Guide (Rev. A) PDF | HTML 12 Jul 2021
Selection guide Voltage Translation Buying Guide (Rev. A) 15 Apr 2021
Application note Low Voltage Translation for SPI, UART, RGMII, JTAG Interfaces (Rev. B) PDF | HTML 29 Mar 2021
Application note Traction Inverter Motor Control Enhancement Using Logic and Translation 25 Jun 2020
Application brief How to Support 1.8-V Signals Using a 3.3-V LVDS Driver/Receiver + Level-Shifter 28 Dec 2018
Application note Glitch free power sequencing with AXC level translators (Rev. A) 20 Sep 2018
User guide SN74AXC8T245 Evaluation Module 02 Aug 2017

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

14-24-LOGIC-EVM — Logic product generic evaluation module for 14-pin to 24-pin D, DB, DGV, DW, DYY, NS and PW packages

The 14-24-LOGIC-EVM evaluation module (EVM) is designed to support any logic device that is in a 14-pin to 24-pin D, DW, DB, NS, PW, DYY or DGV package,

User guide: PDF | HTML
Not available on TI.com
Evaluation board

14-24-NL-LOGIC-EVM — Logic product generic evaluation module for 14-pin to 24-pin non-leaded packages

14-24-NL-LOGIC-EVM is a flexible evaluation module (EVM) designed to support any logic or translation device that has a 14-pin to 24-pin BQA, BQB, RGY, RSV, RJW or RHL package.

User guide: PDF | HTML
Not available on TI.com
Evaluation board

AVCLVCDIRCNTRL-EVM — Generic EVM for Direction-Controlled Bidirectional Translation Device Supporting AVC and LVC

The generic EVM is designed to support one, two, four and eight channel LVC and AVC direction-controlled translation devices. It also supports the bus hold and automotive -Q1 devices in the same number of channels. The AVC are low voltage translation devices with lower drive strength of 12mA. LVC (...)

User guide: PDF
Not available on TI.com
Evaluation board

SN74AXC8T245EVM — SN74AXC8T245 Evaluation Module for Direction-Controlled Bidirectional Translation Device

This EVM is designed to support SN74AXC8T245 which is an 8 channel direction-controlled translation device. There is also option of populating 1, 2, 4 channel LVC and AVC direction controlled translation device. It also supports the bus hold and Q1 devices in the same number of channels. The AXC (...)
User guide: PDF
Not available on TI.com
Evaluation board

TXV0106-EVM — TXV0106 evaluation module

The TXV0106 evaluation module (EVM) is an easy-to-use platform to evaluate the functionality and performance of the TXV0106 device. The EVM has optional circuits and jumpers to configure the device for different applications. The device offers options for both fixed and direction control low-skew, (...)
User guide: PDF | HTML
Not available on TI.com
Evaluation board

TXV0108-EVM — TXV0108 evaluation module

The TXV0108 evaluation module (EVM) is an easy-to-use platform to evaluate the functionality and performance of the TXV0108 device. The EVM has optional circuits and jumpers to configure the device for different applications. The device offers options for both fixed and direction control low-skew, (...)
User guide: PDF | HTML
Not available on TI.com
Simulation model

SN74AXC8T245 IBIS Model (Rev. D)

SCEM580D.ZIP (84 KB) - IBIS Model
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Package Pins CAD symbols, footprints & 3D models
TSSOP (PW) 24 Ultra Librarian
UQFN (RJW) 24 Ultra Librarian
VQFN (RHL) 24 Ultra Librarian
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