Overview
The TCA9406DCUR is a 2-bit bidirectional I2C and SMBus voltage-level translator produced by Texas Instruments. This device is designed to interface between different logic signal levels, making it compatible with various supply rails such as 1.8 V, 2.5 V, 3.3 V, and 5 V. It features an output enable (OE) input and supports high-speed data transfer rates, making it suitable for a wide range of applications requiring voltage translation.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 8-Pin VSSOP (DCU) |
| Operating Temperature Range (°C) | -40 to 85 |
| VCCA (A Port Voltage Range) | 1.65 V to 3.6 V |
| VCCB (B Port Voltage Range) | 2.3 V to 5.5 V |
| Data Transfer Rate | Up to 24 Mbps (with push-pull devices), 1 MHz (Fast-mode Plus) |
| OE Input Voltage | Referenced to VCCA, 5.5 V tolerant |
| Internal Pullup Resistors | 10 kΩ on SCL_A, SDA_A, SCL_B, and SDA_B |
| ESD Protection | A Port: 2500 V (Human-Body Model), B Port: 8 kV (Human-Body Model) |
Key Features
- Bidirectional voltage translation with no direction pin.
- High-impedance output SCL_A, SDA_A, SCL_B, and SDA_B pins when OE = Low or VCC = 0 V.
- 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 standards.
Applications
The TCA9406DCUR is suitable for various applications requiring voltage level translation, including:
- I2C and SMBus interfaces.
- General-purpose level translation.
- Systems with mixed voltage domains (e.g., 1.8 V, 2.5 V, 3.3 V, and 5 V).
- Embedded systems, industrial control systems, and consumer electronics.
Q & A
- What is the primary function of the TCA9406DCUR?
The primary function of the TCA9406DCUR is to perform bidirectional voltage-level translation for I2C and SMBus signals. - What are the voltage ranges for the A and B ports of the TCA9406DCUR?
The A port operates from 1.65 V to 3.6 V, and the B port operates from 2.3 V to 5.5 V. - What is the maximum data transfer rate supported by the TCA9406DCUR?
The device supports up to 24 Mbps with push-pull devices and up to 1 MHz in Fast-mode Plus. - Can the OE input be tied directly to VCCA?
Yes, the OE input can be tied directly to VCCA or controlled by a GPIO. - What is the purpose of the internal pullup resistors on the TCA9406DCUR?
The internal 10 kΩ pullup resistors on SCL_A, SDA_A, SCL_B, and SDA_B help to ensure proper signal levels on the I2C bus. - Does the TCA9406DCUR require power-supply sequencing?
No, the TCA9406DCUR does not require power-supply sequencing; either VCCA or VCCB can be ramped first. - What is the ESD protection level of the TCA9406DCUR?
The device has ESD protection exceeding JESD 22 standards, with 2500 V (Human-Body Model) on the A port and 8 kV (Human-Body Model) on the B port. - What is the typical application of the TCA9406DCUR?
The TCA9406DCUR is typically used in I2C and SMBus interfaces, general-purpose level translation, and systems with mixed voltage domains. - How does the TCA9406DCUR handle low power consumption?
The device has a low Ioff of 2 µA when either VCCA or VCCB = 0 V, reducing quiescent current consumption. - What is the package type of the TCA9406DCUR?
The TCA9406DCUR is packaged in an 8-Pin VSSOP (DCU).
