SN74AXC4T245 4-bit dual-supply bus transceiver | TI.com

SN74AXC4T245 (ACTIVE) 4-bit dual-supply bus transceiver

 

Description

The SN74AXC4T245 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 also accepts any supply voltage from 0.65 V to 3.6 V. Additionally the SN74AXC4T245 is compatible with a single-supply system.

The SN74AXC4T245 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 (1DIR and 2DIR). The output-enable inputs (1OE and 2OE) are used to disable the outputs so the buses are effectively isolated. The SN74AXC4T245 device is designed so the control pins (xDIR and xOE) are referenced to VCCA.

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 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 enter a 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.

Features

  • 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
  • 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
    • 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 JESD 22
    • 8000-V Human-Body Model
    • 1000-V Charged-Device Model

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Parametrics

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Part number Order Technology Family Application Bits (#) High input voltage (Min) (Vih) High input voltage (Max) (Vih) Output voltage (Min) (V) Output voltage (Max) (V) IOH (Max) (mA) IOL (Max) (mA) Package Group Rating
SN74AXC4T245 Order now AXC     UART
JTAG
SPI    
4     0.455     3.6     0.65     3.6     -12     12     TSSOP | 16
UQFN | 16    
Catalog    
SN74AVC2T45 Order now AVC     I2S     2     0.78     3.6     1.2     3.6     -12     12     DSBGA | 8
SM8 | 8
VSSOP | 8    
Catalog    
SN74AVC2T45-Q1 Order now AVC     GPIO
I2S    
2     0.78     3.6     1.2     3.6     -12     12     VSSOP | 8     Automotive    
SN74AVC4T245 Order now AVC     UART
JTAG
SPI    
4     0.78     3.6     1.2     3.6     -12     12     SOIC | 16
TSSOP | 16
TVSOP | 16
UQFN | 16
VQFN | 16    
Catalog    
SN74AVC4T245-Q1 Order now AVC     UART
JTAG
SPI    
4     0.78     3.6     1.2     3.6     -12     12     VQFN | 16     Automotive    
SN74AVC4T774 Order now AVC     SPI
UART
JTAG    
4     0.78     3.6     1.2     3.6     -12     12     TSSOP | 16
UQFN | 16
VQFN | 16