TCA9509: Regarding need of Test conditions to validate this level translator.

Hi Bhuvaneshwari,

Bhuvaneshwari K said:

Static Charateristics (Vih, Vil, Voh) validation, Ron measurement

TCA9509 is an I2C bufffer. It only drives a logic LOW and does not drive the high logic signal. A pull-up resistor is required on the B-side, while A-side has an internal pull-up current source. 

Therefore, spec like VOH is not listed since VOH is the output high logic signal that this device does not output since it only drives a LOW voltage. 

VIL and VIH are specs listed in the recommended operating conditions in the datasheet. These are based off the I2C standard. The testing conditions for these measurements are to simply ramp voltage on the input until either a LOW signal is driven on the output (VIL) or the bus is released on the output (VIH). 

Bhuvaneshwari K said:

Dynamic Charaterstics validation:
Switching time measurements

The switching time measurements can be found in section 7.7 of the datasheet. The test circuit is listed in figure 8-1. 

Bhuvaneshwari K said:

Input/Output signal frequency range validation

This device is an I2C buffer compatible with I2C speeds up to fast mode (0Hz to 400kHz). 

Any frequency above 400kHz is not guaranteed by the datasheet. 

Bhuvaneshwari K said:

Multivoltage level translator validation

Voltage recommendations for VCCA and VCCB are found in section 7.3 of the datasheet. 

The devices are designed to maintain the min and max voltage for VCCA and VCCB. Devices are tested at the min and max ratings. 

Bhuvaneshwari K said:

Application curve validation using communication interface (I2C, SMBUS etc.)

TCA9509 is rated I2C compliant for fast mode speeds (0 to 400kHz). It has been designed and tested to meet the I2C standard for things like rise-time and bus capacitance. 

Regards,

Tyler

Bhuvaneshwari,

The test circuit to test the electrical characteristics in the datasheet is found in figure 8-1

All of the tests listed can be conducted using the circuit above. 

Regards,

Tyler

Hi Bhuvaneshwari,

TCA9509 is an i2c bi-directional buffer. This device does not have a passive element separating the A-side from the B-side. It has active circuitry in the device with direction control, therefore Ron is not measured. 

A device like the PCA9306 would have Ron measurements because this device is passive in nature with only a passFET separating the two sides from each other. 

Regards,

Tyler