Overview
The TCA9416DTMR is a 2-bit bidirectional I2C and SMBus voltage-level translator produced by Texas Instruments. This device is designed to translate logic voltage levels between different supply rails, operating from 1.08 V to 3.6 V on both the A-side and B-side. It features an output enable (OE) input and rising and falling edge accelerators, making it suitable for interfacing between lower and higher logic signal levels in various electronic systems.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 8-pin X2SON (DTM) |
| Operating Temperature Range | -40°C to 125°C |
| Supply Voltage Range | 1.08 V to 3.6 V (both A and B ports) |
| Internal Pull-up Resistors | 10-kΩ on SCL_A, SDA_A, SCL_B, and SDA_B |
| ESD Protection | 2500-V Human-body model, 1500-V Charged-device model |
| I2C and SMBus Compatibility | Standard-mode (100 kHz), Fast-mode (400 kHz), Fast-mode Plus (1 MHz) |
| Output Enable (OE) Input | Referenced to VCCA, 3.6-V tolerant |
| Low Ioff | 2.5 µA when either VCCA or VCCB = 0 V |
Key Features
- 2-bit bidirectional translator for SDA and SCL lines in I2C applications without a direction pin.
- Provides bidirectional voltage translation between 1.08 V to 3.6 V on both A and B ports.
- High-impedance output SCL_A, SDA_A, SCL_B, SDA_B pins when OE = 0 V or VCC = 0 V.
- Internal 10-kΩ pull-up resistors on all SDA and SCL pins.
- No power-supply sequencing required: either VCCA or VCCB can be ramped first.
- Output rise and fall time accelerators to improve data rate.
- ESD protection exceeds JESD 22 standards.
- Latch-up performance exceeds 100 mA per JESD 78, class II.
Applications
- Wearables: For interfacing different voltage levels in wearable devices.
- Personal electronics: Suitable for various personal electronic devices requiring voltage translation.
- Servers: Used in server systems to bridge voltage compatibility gaps between different components.
- Open-drain drivers: Ideal for I2C or SMBus applications where data is bidirectional and no control signal is available.
Q & A
- What is the primary function of the TCA9416DTMR?
The primary function is to provide 2-bit bidirectional voltage-level translation for I2C and SMBus applications. - What is the operating voltage range of the TCA9416DTMR?
The device operates from 1.08 V to 3.6 V on both the A-side and B-side. - Does the TCA9416DTMR require a direction pin for voltage translation?
No, it does not require a direction pin for bidirectional voltage translation. - What is the purpose of the output enable (OE) input?
The OE input can be used to disable the device by setting it low, which prevents signals from propagating across the device and reduces quiescent current consumption. - What are the internal pull-up resistors on the TCA9416DTMR?
There are internal 10-kΩ pull-up resistors on SCL_A, SDA_A, SCL_B, and SDA_B. - Is the TCA9416DTMR compatible with standard I2C and SMBus speeds?
Yes, it is compatible with standard speeds (100 kHz, 400 kHz, and 1 MHz). - What is the ESD protection level of the TCA9416DTMR?
The device has ESD protection exceeding 2500-V Human-body model and 1500-V Charged-device model. - Can the power supplies be sequenced in any order?
Yes, either VCCA or VCCB can be ramped first without damaging the device. - What are the edge accelerators used for in the TCA9416DTMR?
The rise and fall time accelerators are used to speed up the output slew rate, improving the data rate through the device. - In what types of applications is the TCA9416DTMR commonly used?
It is commonly used in wearables, personal electronics, servers, and applications involving open-drain drivers.
