4-bit dual-supply bus transceiver

SN74AXCH4T245

ACTIVE

Product details

Technology Family AXC Applications UART, JTAG, SPI Bits (#) 4 High input voltage (Min) (Vih) 0.455 High input voltage (Max) (Vih) 3.6 Vout (Min) (V) 0.65 Vout (Max) (V) 3.6 IOH (Max) (mA) -12 IOL (Max) (mA) 12 Rating Catalog
Technology Family AXC Applications UART, JTAG, SPI Bits (#) 4 High input voltage (Min) (Vih) 0.455 High input voltage (Max) (Vih) 3.6 Vout (Min) (V) 0.65 Vout (Max) (V) 3.6 IOH (Max) (mA) -12 IOL (Max) (mA) 12 Rating Catalog
TSSOP (PW) 16 22 mm² 5 x 4.4 UQFN (RSV) 16 5 mm² 2.6 x 1.8
  • Fully configurable dual-rail design allows each port to operate with a power supply range from 0.65 V to 3.6 V
  • Bus-hold on data inputs eliminates the need for external pullup or pulldown resistors
  • Operating temperature from –40°C to +125°C
  • Multiple direction control pins to allow simultaneous up and down translation
  • Glitch-free power supply sequencing
  • Up to 380 Mbps support when translating from 1.8 V to 3.3 V
  • VCC isolation feature
  • Ioff supports partial-power-down mode operation
  • Compatible with AVC family level shifters
  • Latch-up performance exceeds 100 mA per JESD 78, Class II
  • ESD protection exceeds JESD 22
    • 8000-V Human-body model
    • 1000-V Charged-device model
  • Fully configurable dual-rail design allows each port to operate with a power supply range from 0.65 V to 3.6 V
  • Bus-hold on data inputs eliminates the need for external pullup or pulldown resistors
  • Operating temperature from –40°C to +125°C
  • Multiple direction control pins to allow simultaneous up and down translation
  • Glitch-free power supply sequencing
  • Up to 380 Mbps support when translating from 1.8 V to 3.3 V
  • VCC isolation feature
  • Ioff supports partial-power-down mode operation
  • Compatible with AVC family level shifters
  • Latch-up performance exceeds 100 mA per JESD 78, Class II
  • ESD protection exceeds JESD 22
    • 8000-V Human-body model
    • 1000-V Charged-device model

The SN74AXCH4T245 is a four-bit noninverting bus transceiver that uses two individually configurable power-supply rails. The device is operational with both VCCA and VCCB supplies as low as 0.65 V. The A port is designed to track VCCA, which accepts any supply voltage from 0.65 V to 3.6 V. The B port is designed to track VCCB, which accepts any supply voltage from 0.65 V to 3.6 V. The SN74AXCH4T245 device is compatible with a single-supply system.

The SN74AXCH4T245 device is designed for asynchronous communication between data buses and 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 (1DIR and 2DIR). The output-enable inputs (1OE and 2OE) are used to disable the outputs so the buses are effectively isolated. All control pins (xDIR and xOE) are referenced to VCCA.

Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended. If a supply is present for VCCA or VCCB, the bus-hold circuitry always remains active on the A or B inputs respectively, independent of the state of the direction control or output enable pins.

To ensure the high-impedance state of the level shifter I/Os during power up or power down, the xOE pins should be tied to VCCA through a pullup resistor.

This device is fully specified for partial-power-down applications using the Ioff current. The Ioff protection circuitry ensures that no excessive current is drawn from or sourced into an input, output, or combined I/O that is biased to a specific voltage while the device is powered down.

The VCC isolation feature ensures that if either VCCA or VCCB is less than 100 mV, all I/O ports enter a high-impedance state by disabling the outputs.

Glitch-free power supply sequencing allows either supply rail to be powered on or off in any order while providing robust power sequencing performance.

The SN74AXCH4T245 is a four-bit noninverting bus transceiver that uses two individually configurable power-supply rails. The device is operational with both VCCA and VCCB supplies as low as 0.65 V. The A port is designed to track VCCA, which accepts any supply voltage from 0.65 V to 3.6 V. The B port is designed to track VCCB, which accepts any supply voltage from 0.65 V to 3.6 V. The SN74AXCH4T245 device is compatible with a single-supply system.

The SN74AXCH4T245 device is designed for asynchronous communication between data buses and 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 (1DIR and 2DIR). The output-enable inputs (1OE and 2OE) are used to disable the outputs so the buses are effectively isolated. All control pins (xDIR and xOE) are referenced to VCCA.

Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended. If a supply is present for VCCA or VCCB, the bus-hold circuitry always remains active on the A or B inputs respectively, independent of the state of the direction control or output enable pins.

To ensure the high-impedance state of the level shifter I/Os during power up or power down, the xOE pins should be tied to VCCA through a pullup resistor.

This device is fully specified for partial-power-down applications using the Ioff current. The Ioff protection circuitry ensures that no excessive current is drawn from or sourced into an input, output, or combined I/O that is biased to a specific voltage while the device is powered down.

The VCC isolation feature ensures that if either VCCA or VCCB is less than 100 mV, all I/O ports enter a high-impedance state by disabling the outputs.

Glitch-free power supply sequencing allows either supply rail to be powered on or off in any order while providing robust power sequencing performance.

Download

Similar products you might be interested in

open-in-new Compare products
Similar functionality to the compared device.
SN74AVCH24T245 ACTIVE 24-bit dual-supply bus transceiver with configurable voltage translation and 3-state outputs Similar function in 24-channel version

Technical documentation

star = Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 5
Type Title Date
* Data sheet SN74AXCH4T245 Four-bit bus transceiver with configurable voltage translation, tri-state outputs, and bus-hold inputs datasheet 11 Nov 2016
Selection guide Voltage Translation Buying Guide (Rev. A) 15 Apr 2021
Application note Low Voltage Translation for SPI, UART, RGMII, JTAG Interfaces (Rev. B) 29 Mar 2021
Application note Glitch free power sequencing with AXC level translators (Rev. A) 20 Sep 2018
Application note An Overview of Bus-Hold Circuit and the Applications (Rev. B) 17 Sep 2018

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 — Generic Logic EVM Supporting 14 through 24 Pin PW, DB, D, DW, NS, DYY, and DGV Packages

This EVM is designed to support any logic device that has a D, DW, DB, NS, PW, DYY or DGV package in a 14 to 24 pin count.

In stock
Limit: 5
Evaluation board

14-24-NL-LOGIC-EVM — Generic 14 through 24 pin non-leaded package evaluation module

Flexible EVM designed to support any logic or translation device that has a BQA, BQB, RGY (14-24 pin), RSV, RJW, or RHL package.
In stock
Limit: 10
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 (...)

In stock
Limit: 5
Evaluation board

AXC-SMALLPKG1EVM — Evaluation module for small package direction-controlled translation devices

This EVM is designed to support SN74AXC8T245 in the RJW package and SN74AXC1T45 in DEA and the DTQ packages. There is also option of populating the SN74AVC4T245 in the RSV package. It is also designed to support the bus hold and Q1 devices for the respective channel counts.

The AXC devices belong to (...)

In stock
Limit: 5
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 (...)
In stock
Limit: 5
Simulation model

SN74AXCH4T245 IBIS Model

SCEM588.ZIP (28 KB) - IBIS Model
Package Pins Download
TSSOP (PW) 16 View options
UQFN (RSV) 16 View options

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos