TCA9801
- Two-channel bidirectional buffer
- Integrated current source on B-side, requires no external B-side resistors
- Ultra-low power consumption
- No static-voltage offset, low VOL
- I2C bus and SMBus compatible
- Operating supply voltage range of 0.8 V to 3.6 V on A-side
- Operating supply voltage range of 1.65 V to 3.6 V on B-side
- Active-high repeater enable input
- Powered-off high impedance I2C bus pins on A-side
- Powered-off back-power protection I2C bus pins
- Support for clock stretching and multiple master arbitration
- Family of current source options from 0.5 mA to 3 mA
The TCA9801 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 TCA9801 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 TCA9801 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 TCA9801 are very low (approximately 0.2 V), helping to eliminate communication issues as a result of fixed VIL thresholds. Another key feature of the TCA9801 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 TCA9801 is used.
The TCA9801 is part of a four device family with varying current source strengths (see the Device Comparison Table).
기술 자료
| 상위 문서 | 유형 | 직함 | 형식 옵션 | 최신 영어 버전 다운로드 | 날짜 |
|---|---|---|---|---|---|
| * | 데이터 시트 | TCA9801 Level-Translating I2C Bus Buffer/Repeater datasheet (Rev. B) | PDF | HTML | 2020. 2. 13 | |
| 애플리케이션 노트 | Understanding Transient Drive Strength vs. DC Drive Strength in Level-Shifters (Rev. A) | PDF | HTML | 2024. 7. 3 | ||
| Application brief | Best Practices: I2C Devices on an I3C Shared Bus | PDF | HTML | 2023. 3. 30 | ||
| 애플리케이션 노트 | Why, When, and How to use I2C Buffers | 2018. 5. 23 | |||
| 애플리케이션 노트 | Advantages and Design Considerations of the TCA980x Family | 2017. 3. 30 | |||
| 애플리케이션 노트 | Choosing the Correct I2C Device for New Designs | PDF | HTML | 2016. 9. 7 | ||
| 선택 가이드 | I2C Infographic Flyer | 2015. 12. 3 | |||
| 애플리케이션 노트 | Understanding the I2C Bus | PDF | HTML | 2015. 6. 30 | ||
| 애플리케이션 노트 | Maximum Clock Frequency of I2C Bus Using Repeaters | 2015. 5. 15 | |||
| 애플리케이션 노트 | I2C Bus Pull-Up Resistor Calculation | PDF | HTML | 2015. 2. 13 |
설계 및 개발
추가 조건 또는 필수 리소스는 사용 가능한 경우 아래 제목을 클릭하여 세부 정보 페이지를 확인하세요.
TCA9802EVM — TCA980x I²C 및 SMBus 레벨 시프터 제품군 평가 모듈
I2C-DESIGNER — I2C 디자이너 툴
| 패키지 | 핀 | CAD 기호, 풋프린트 및 3D 모델 |
|---|---|---|
| VSSOP (DGK) | 8 | Ultra Librarian |
주문 및 품질
권장 제품에는 본 TI 제품과 관련된 매개 변수, 평가 모듈 또는 레퍼런스 디자인이 있을 수 있습니다.