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TCA9803

SCPS267B – MARCH 2017 – REVISED FEBRUARY 2020

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9 Detailed Description

9.1 Overview

The TCA9803 is a dual-channel bidirectional buffer intended for I2C bus and SMBus/PMBus systems. It provides

bidirectional level shifting (up-translation and down-translation) between low voltages (down to 0.8 V) and higher

voltages (1.65 V to 3.6 V). The TCA9803 features an internal current source on the B-side of the device, allowing

the removal of external pull-up resistors on the B-side. The current source also provides an improved rise time

and ultra-low power consumption.

The TCA9803 is able to provide true buffering (rather than a pass-FET solution) without using a static voltage

offset or incremental offset. This means that the VOL on both the A and B sides of the TCA9803 are very low

(approximately 0.2 V), helping to eliminate communication issues as a result of fixed VIL thresholds. Another key

feature of the TCA9803 is that there are no power sequencing requirements, or power supply dependencies.

VCCA can be greater than, less than, or equal to VCCB. This gives the system designer flexibility with how the

TCA9803 is used.

The TCA9803 is part of a four device family with varying current source strengths (see the Device Comparison

Table).