TCA9800
- 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 TCA9800 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 TCA9800 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 TCA9800 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 TCA9800 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 TCA9800 is used.
The TCA9800 is part of a four device family with varying current source strengths (see the Device Comparison Table).
技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | TCA9800 Level-Translating I2C Bus Buffer/Repeater datasheet (Rev. B) | PDF | HTML | 2020年 2月 13日 |
| Application note | Understanding Transient Drive Strength vs. DC Drive Strength in Level-Shifters (Rev. A) | PDF | HTML | 2024年 7月 3日 | |
| Application brief | Best Practices: I2C Devices on an I3C Shared Bus | PDF | HTML | 2023年 3月 30日 | |
| Application note | Why, When, and How to use I2C Buffers | 2018年 5月 23日 | ||
| Application note | Advantages and Design Considerations of the TCA980x Family | 2017年 3月 30日 | ||
| Application note | Choosing the Correct I2C Device for New Designs | PDF | HTML | 2016年 9月 7日 | |
| Selection guide | I2C Infographic Flyer | 2015年 12月 3日 | ||
| Application note | Understanding the I2C Bus | PDF | HTML | 2015年 6月 30日 | |
| Application note | Maximum Clock Frequency of I2C Bus Using Repeaters | 2015年 5月 15日 | ||
| Application note | I2C Bus Pull-Up Resistor Calculation | PDF | HTML | 2015年 2月 13日 |
設計與開發
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TCA9802EVM — TCA980x 系列 I²C 和 SMBus 位準移位器評估模組
I2C-DESIGNER — I2C 設計工具
PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具
TINA-TI — 基於 SPICE 的類比模擬程式
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| VSSOP (DGK) | 8 | Ultra Librarian |
訂購與品質
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 認證摘要
- 進行中持續性的可靠性監測
- 晶圓廠位置
- 組裝地點
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。