Texas Instruments TCA9406DCUR-Level Shifters

Level shifters are commonly used in semiconductor circuits to convert a signal level in one voltage domain to a different voltage level in another domain. Existing circuits for performing level shifting typically seek to provide an output at a desired voltage level with characteristics matching those of the input signal.

As an intermediate bridge between low-voltage control circuits and high-voltage drive circuits, level shifters are widely used in power integrated circuits such as small and medium power supplies, display drivers, electronic ballasts for lighting, and motor drive converters.

TCA9406DCUR Description

Made by Texas Instruments, 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 Aside, 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 2 Mbps; 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.

TCA9406DCUR 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)

TCA9406DCUR Pin Configuration and Functions

TCA9406DCUR Functional Block Diagram

TCA9406DCUR Application Information

The TCA9406 can be used to bridge the digital-switching compatibility gap between two voltage nodes to successfully interface logic threshold levels found in electronic systems. It should be used in a point-to-point topology for interfacing devices or systems operating at different interface voltages with one another. Its primary target application use is for interfacing with open-drain drivers on the data I/Os such as I²C or SMBus, where the data is bidirectional and no control signal is available.

TCA9406DCUR Application Block Diagram

TCA9406DCUR Detailed Design Procedure

Input voltage range:

Use the supply voltage of the device that is driving the TCA9406 device to determine the input voltage range. For a valid logic high the value must exceed the VIH of the input port. For a valid logic low the value must be less than the VIL of the input port.

Output voltage range:

Use the supply voltage of the device that the TCA9406 device is driving to determine the output voltage range.

The TCA9406 device has 10-kΩ internal pullup resistors. External pullup resistors can be added to reduce the total RC of a signal trace if necessary.

Application Curve

TCA9406DCUR Product Parameter

TCA9406DCUR Manufacturer

Texas Instruments is a semiconductor multinational company in Texas, USA. It is famous for developing, manufacturing, and selling semiconductor and computer technology. It is mainly engaged in innovative digital signal processing and analog circuits. In addition to the semiconductor business, it also provides solutions including sensing and control, educational products and digital light source processing. Texas Instruments (TI) is headquartered in Dallas, Texas, USA, and has manufacturing, design or sales organizations in more than 25 countries.