SN74AVCH4T245 4-Bit Dual-Supply Bus Transceiver with Configurable Voltage Translation and 3-State Outputs | TI.com

SN74AVCH4T245 (ACTIVE)

4-Bit Dual-Supply Bus Transceiver with Configurable Voltage Translation and 3-State Outputs

 

Description

This 4-bit noninverting bus transceiver uses two separate configurable power-supply rails. The A port is designed to track VCCA. VCCA accepts any supply voltage from 1.2 V to 3.6 V. The B port is designed to track VCCB. VCCB accepts any supply voltage from 1.2 V to 3.6 V. The SN74AVCH4T245 is optimized to operate with VCCA/VCCB set at 1.4 V to 3.6 V. It is operational with VCCA/VCCB as low as 1.2 V. This allows for universal low voltage bidirectional translation between any of the 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V voltage nodes.

The SN74AVCH4T245 is designed for asynchronous communication between two data buses. The logic levels of the direction-control (DIR) input and the output-enable (OE) input activate either the B-port outputs or the A-port outputs or place both output ports into the high-impedance mode. The device transmits data from the A bus to the B bus when the B-port outputs are activated, and from the B bus to the A bus when the A-port outputs are activated. The input circuitry on both A and B ports is always active and must have a logic HIGH or LOW level applied to prevent excess ICC and ICCZ.

The SN74AVCH4T245 device control pins (1DIR, 2DIR, 1OE, and 2OE) are supplied by VCCA.

This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down.

The VCC isolation feature ensures that if either VCC input is at GND, then both ports are in the high-impedance state. The bus-hold circuitry on the powered-up side always stays active.

Active bus-hold circuitry holds unused or undriven data inputs at a valid logic state. Use of pull-up or pull-down resistors with the bus-hold circuitry is not recommended. The bus-hold circuitry on the powered-up side always stays active.

To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pull-up resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

Features

  • Control Inputs VIH/VIL Levels are Referenced to
    VCCA Voltage
  • Fully Configurable Dual-Rail Design Allows Each
    Port to Operate Over the Full 1.2V to 3.6V Power-
    Supply Range
  • I/Os Are 4.6V Tolerant
  • Ioff Supports Partial Power-Down-Mode Operation
  • Bus Hold on Data Inputs Eliminates the Need for
    External pull-up/pull-down Resistors
  • Max Data Rates
    • 380 Mbps (1.8 V to 3.3 V Translation)
    • 200 Mbps (<1.8 V to 3.3 V Translation)
    • 200 Mbps (Translate to 2.5 V or 1.8 V)
    • 150 Mbps (Translate to 1.5 V)
    • 100 Mbps (Translate to 1.2 V)
  • Latch-Up Performance Exceeds 100 mA Per
    JESD 78, Class II
  • ESD Protection Exceeds JESD 22
    • 8000 V Human Body Model (A114-A)
    • 200 V Machine Model (A115-A)
    • 1000 V Charged-Device Model (C101)

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
SN74AVCH4T245 Order now AVC     UART
JTAG
SPI
I2S    
4     1.2     3.6     1.2     3.6     -12     12     SOIC | 16
TSSOP | 16
TVSOP | 16
UQFN | 16
VQFN | 16    
Catalog    
SN74AVC4T234 Order now AVC     SPI
UART
JTAG
I2S
GPIO    
4     0.9     3.6     0.9     3.6     -12     12     uCSP | 11     Catalog    
SN74AVC4T245 Order now AVC     UART
SPI
JTAG
I2S    
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
SPI
JTAG
I2S    
4     0.78     3.6     1.2     3.6     -12     12     VQFN | 16     Automotive    
SN74AVC4T774 Order now AVC     SPI
UART
JTAG
I2S    
4     0.78     3.6     1.2     3.6     -12     12     TSSOP | 16
UQFN | 16
VQFN | 16    
Catalog    
SN74AVCH16T245 Order now AVC     RGMII
SPI
UART
JTAG
I2S    
16     1     3.6     1.2     3.6