Automotive 4-bit 2-supply bus transceiver with 3-state outputs, independent direction control inputs



Product details


Technology Family AXC Applications SPI, UART, JTAG, I2S Bits (#) 4 High input voltage (Min) (Vih) 0.45 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 Automotive open-in-new Find other Direction-controlled voltage translators

Package | Pins | Size

TSSOP (PW) 16 22 mm² 5 x 4.4 UQFN (RSV) 16 5 mm² 2.6 x 1.8 WQFN (BQB) 16 9 mm² 3.5 x 2.5 open-in-new Find other Direction-controlled voltage translators


  • AEC-Q100 Qualified for Automotive Applications
  • Fully Configurable Dual-Rail Design Allows Each Port to Operate with a Power Supply Range from 0.65 V to 3.6 V
  • Operating Temperature from –40°C to +125°C
  • Independent Direction Control Pins to Allow Configurable Up and Down Translation
  • Glitch-Free Power Supply Sequencing
  • Up to 310 Mbps Support when Translating from 1.8 V to 3.3 V
  • VCC Isolation Feature:
    • If Either VCC Input is Below 100 mV, All I/Os Outputs are Disabled and Become High-Impedance
  • 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 JEDEC JS-001
    • 8000-V Human-Body Model
    • 1000-V Charged-Device Model
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The SN74AXC4T774-Q1 is a four-bit non-inverting 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 also accepts any supply voltage from 0.65 V to 3.6 V. Additionally the SN74AXC4T774-Q1 is compatible with a single-supply system.

The SN74AXC4T774-Q1 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 (DIRx). The output-enable input (OE) is used to disable the outputs so the buses are effectively isolated. The SN74AXC4T774-Q1 device is designed so the control pins (DIRx and OE) are referenced to VCCA.

To ensure the high-impedance state of the level shifter I/Os during power up or power down, the OE pin 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 to 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, both I/O ports are set to the high-impedance state by disabling their 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.

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SN74AXC4T774 ACTIVE 4-bit dual-supply bus transceiver with 3-state outputs and independent direction control inputs Commercial qualified version
Same functionality with different pin-out to the compared device.
SN74AXC4T245-Q1 ACTIVE Automotive 4-bit dual-supply bus transceiver w/ configurable voltage translation, 3-state output 4 bit translator with grouped channel control

Technical documentation

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Type Title Date
* Data sheet SN74AXC4T774-Q1 Automotive 4-Bit Dual-Supply Bus Transceiver with Independent Direction, Configurable-Voltage Translation, and Tri-State Outputs datasheet (Rev. D) Mar. 09, 2021
Application note Translate Voltages for SPI (Rev. A) Aug. 04, 2021

Design & development

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

Hardware development

document-generic User guide
Flexible EVM designed to support any logic or translation device that has a BQA, BQB, RGY (14-24 pin), RSV, RJW, or RHL package.
  • Board design allows for versatility in evaluation
  • Supports a wide-range of logic and translation devices with included dual supply support
  • Board has 9 sections that can be broken apart for a smaller form factor
document-generic User guide
This EVM is designed to support SN74AXC4T774 in RSV and PW packages. It is also backwards compatible to allow the use of the existing SN74AVC4T774 device in these packages. The AXC device belong to the low voltage direction controlled translation family with operating voltage from 0.65V to 3.6V with (...)
  • High speed SMB connector available
  • Ground port for each header pin supports high speed measurement
  • OE pin have the option of 10K Ω resistor pullup or pulldown
  • Layout optimized for high speed connectivity
  • EVM is SPI, JTAG Interface ready with A[1:3] to B[1:3] and B4 to A4 signal direction

Design tools & simulation

SCEM589A.ZIP (140 KB) - IBIS Model

CAD/CAE symbols

Package Pins Download
TSSOP (PW) 16 View options
UQFN (RSV) 16 View options
WQFN (BQB) 16 View options

Ordering & quality

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Support & training

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