2-Bit Bidirectional 1-MHz I2C Bus and SMBus Voltage-Level Shifter - TCA9406

TCA9406 (ACTIVE)

2-Bit Bidirectional 1-MHz I2C Bus and SMBus Voltage-Level Shifter

 

Description

The TCA9406 is a 2-bit bidirectional I2C and SMBus voltage-level translator with an output enable (OE) input. It is operational from 1.65 V to 3.6 V on the A-side, referenced toVCCA, and from 2.3 V to 5.5 V on the B-side, referenced to VCCB. This allows the device to interface between lower and higher logic signal levels at any of the typical 1.8-V, 2.5-V, 3.3-V, and 5-V supply rails.

The OE input pin is referenced to VCCA, can be tied directly to VCCA, but it is also 5.5-V tolerant. The OE pin can also be controlled and set to a logic low to place all the SCL and SDA pins in a high-impedance state, which significantly reduces the quiescent current consumption.

Under normal I2C and SMBus operation or other open-drain configurations, the TCA9406 can support up to 2Mbps; therefore, it is compatible with standard I2C speeds where the frequency of SCL is 100 kHz (Standard-mode), 400 kHz (Fast-mode), or 1 MHz (Fast-mode Plus). The device can also be used as a general purpose level translator, and when the A- and B-side ports are both driven with push-pull devices the TCA9406 can support up to 24 Mbps.

The TCA9406 features internal 10-kΩ pullup resistors on SCL_A, SDA_A, SCL_B, and SDA_B. Additional external pullup resistors can be added to the bus to reduce the total pullup resistance and speed up rising edges.

Features

  • 2-Bit Bidirectional Translator for SDA and SCL
    Lines in I2C Applications
  • Provides Bidirectional Voltage Translation With No
    Direction Pin
  • High-Impedance Output SCL_A, SDA_A, SCL_B, SDA_B
    Pins When OE = Low or VCC = 0 V
  • Internal 10-kΩ Pullup Resistor on All SDA
    and SCL Pins
  • 1.65 V to 3.6 V on A port and 2.3 V to 5.5 V on
    B port (VCCA ≤ VCCB)
  • VCC Isolation Feature: If Either VCC
    Input Is at GND, Both Ports Are in the High-Impedance State
  • No Power-Supply Sequencing Required: Either VCCA
    or VCCB Can Be Ramped First
  • Low Ioff of 2 µA When Either VCCA
    or VCCB = 0 V
  • OE Input Can Be Tied Directly to VCCA Or
    Controlled By GPIO
  • Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
  • ESD Protection Exceeds JESD 22
    • A Port
      • 2500-V Human-Body Model (A114-B)
      • 250-V Machine Model (A115-A)
      • 1500-V Charged-Device Model (C101)
    • B Port
      • 8-kV Human-Body Model (A114-B)
      • 250-V Machine Model (A115-A)
      • 1500-V Charged-Device Model (C101)

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Parametrics Compare all products in I2C Level Shifters, Buffers, and Hubs

 
Number of Outputs
fSCLK (Max) (MHz)
VCC (Max) (V)
VCC (Min) (V)
Max Frequency (kHz)
Channel Width
Master Side I2C Bus Capacitance Supported (pF)
Slave Side I2C Bus Capacitance Supported (pF)
Features
Operating Temperature Range (C)
Package Group
Pin/Package
TCA9406 PCA9306 PCA9306-Q1
2    2    2   
1    0.4    0.4   
5.5    5.5    5.5   
1.65    1.2    1.2   
1000    400    400   
2    2    2   
400    400    400   
400    400    400   
5V Tolerant I/O
Enable Pin
Open-Drain I/O Type   
Enable Pin
Low Voltage
Open-Drain I/O Type
5V Tolerant I/O   
Enable Pin
Low Voltage
Open-Drain I/O Type
5V Tolerant I/O   
-40 to 85    -40 to 85    -40 to 105
-40 to 85   
DSBGA
SM8
VSSOP   
DSBGA
SM8
VSSOP
X2SON   
VSSOP   
8DSBGA
8SM8
8VSSOP   
8DSBGA
8SM8
8VSSOP
8X2SON   
8VSSOP   
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