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1. Description
The TCA9800DGKR 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 TCA9800DGKR 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 TCA9800DGKR 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 TCA9800DGKR are very low (approximately 0.2 V), helping to eliminate communication issues as a result of fixed VIL thresholds. Another key feature of the TCA9800 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 TCA9800DGKR is used.
2. Features
1. Two-channel bidirectional buffer
2. Integrated current source on B-side, requires no external B-side resistors
3. Ultra-low power consumption
4. No static-voltage offset, low VOL
5. I2C bus and SMBus compatible
6. Operating supply voltage range of 0.8 V to 3.6 V on A-side
7. Operating supply voltage range of 1.65 V to 3.6 V on B-side
8. Active-high repeater enable input
9. Powered-off high impedance I2C bus pins on Aside
10. Powered-off back-power protection I2C bus pins
11. Support for clock stretching and multiple master arbitration
12. Family of current source options from 0.5 mA to 3mA
3. Applications
1. Servers
2. Routers (routing equipment)
3. Industrial equipment
4. Personal computers
5. Power-sensitive applications
