TCA4311 可热插拔双线总线缓冲器
The TCA4311 is a hot swappable I2C bus buffer that supports I/O card insertion into a live backplane without corruption of the data and clock busses. Control circuitry prevents the backplane from being connected to the card until a stop command or bus idle occurs on the backplane without bus contention on the card. When the connection is made, this device provides bidirectional buffering, keeping the backplane and card capacitances isolated. During insertion, the SDA and SCL lines are precharged to 1 V to minimize the current required to charge the parasitic capacitance of the chip.
When the I2C bus is idle, the TCA4311 can be put into shutdown mode by setting the EN pin low. When EN is high, the TCA4311 resumes normal operation. It also includes an open drain READY output pin, which indicates that the backplane and card sides are connected together. When READY is high, the SDAIN and SCLIN are connected to SDAOUT and SCLOUT. When the two sides are disconnected, READY is low.
Both the backplane and card may be powered with supply voltages ranging from 2.7 V to 5.5 V, with no restrictions on which supply voltage is higher.
The TCA4311 has standard open-drain I/Os. The size of the pullup resistors to the I/Os depends on the system, but each side of this buffer must have a pullup resistor. The device is designed to work with Standard Mode and Fast Mode I2C devices in addition to SMBus devices. Standard Mode I2C devices only specify 3 mA in a generic I2C system where Standard Mode devices and multiple masters are possible. Under certain conditions, high termination currents can be used
| TCA4311 | |
| fSCLK(Max)(MHz) | 400 |
| VCC(Min)(V) | 2.7 |
| VCC(Max)(V) | 5.5 |
| Pin/Package | 8MSOP, 8SOIC |
| Max Frequency(kHz) | 400 |
| Vcc range(V) | 2.7 to 5.5 |
| Channel Width | 2 |
| Master Side I2C Bus Capacitance Supported(pF) | 400 |
| Slave Side I2C Bus Capacitance Supported(pF) | 400 |
| 5V Tolerant I/O | Yes |
| Open–Drain I/O Type | Yes |
| Enable Pin | Yes |
TCA4311 特性
- Operating Power-Supply Voltage Range of 2.7-V to 5.5-V
- Supports Bidirectional Data Transfer of I2C Bus Signals
- SDA and SCL Lines Are Buffered Which Increases Fanout
- 1-V Precharge on All SDA and SCL Lines Prevents Corruption During Live Board Insertion and Removal From Backplane
- SDA and SCL Input Lines Are Isolated From Outputs
- Accommodates Standard Mode and Fast Mode I2C Devices
- Applications Include Hot Board Insertion and Bus Extension
- Low ICC Chip Disable of <1 µA
- READY Open-Drain Output
- Supports Clock Stretching, Arbitration, and Synchronization
- Powered-Off High-Impedance I2C Pins
- Open-Drain I2C Pins
- Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
- ESD Protection Exceeds JESD 22
- 8000-V Human-Body Model (A114-A)
- 200-V Machine Model (A115-A)
- 1000-V Charged-Device Model (C101)
TCA4311 芯片订购指南
| 器件 | 状态 | 温度 | 价格 | 封装 | 引脚 | 封装数量 | 封装载体 | 丝印标记 |
| TCA4311D | ACTIVE | -40 to 85 | 1.90 | 1ku | SOIC (D) | 8 | 75 | TUBE | |
| TCA4311DG4 | ACTIVE | -40 to 85 | 1.90 | 1ku | SOIC (D) | 8 | 75 | TUBE | |
| TCA4311DGKR | ACTIVE | -40 to 85 | 1.60 | 1ku | MSOP (DGK) | 8 | 2500 | LARGE T&R | |
| TCA4311DGKRG4 | ACTIVE | -40 to 85 | 1.60 | 1ku | MSOP (DGK) | 8 | 2500 | LARGE T&R | |
| TCA4311DR | ACTIVE | -40 to 85 | 1.60 | 1ku | SOIC (D) | 8 | 2500 | LARGE T&R | |
| TCA4311DRG4 | ACTIVE | -40 to 85 | 1.60 | 1ku | SOIC (D) | 8 | 2500 | LARGE T&R |
TCA4311 质量与无铅数据
| 器件 | 环保计划* | 铅/焊球涂层 | MSL 等级/回流焊峰 | 环保信息与无铅 (Pb-free) | DPPM / MTBF / FIT 率 |
| TCA4311D | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | TCA4311D | TCA4311D |
| TCA4311DG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | TCA4311DG4 | TCA4311DG4 |
| TCA4311DGKR | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | TCA4311DGKR | TCA4311DGKR |
| TCA4311DGKRG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | TCA4311DGKRG4 | TCA4311DGKRG4 |
| TCA4311DR | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | TCA4311DR | TCA4311DR |
| TCA4311DRG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | TCA4311DRG4 | TCA4311DRG4 |
TCA4311 应用技术支持与电子电路设计开发资源下载
- TCA4311 数据资料 dataSheet 下载.PDF
- TI 德州仪器I2C 逻辑器件产品选型与价格 . xls
- Logic Guide 2009 (PDF 4263 KB)
- Shelf-Life Evaluation of Lead-Free Component Finishes (PDF 1305 KB)
- Understanding and Interpreting Standard-Logic Data Sheets (PDF 857 KB)
- TI IBIS File Creation, Validation, and Distribution Processes (PDF 380 KB)
- Implications of Slow or Floating CMOS Inputs (PDF 101 KB)
- CMOS Power Consumption and CPD Calculation (PDF 89 KB)
- Designing With Logic (PDF 186 KB)
- Live Insertion (PDF 150 KB)
- Input and Output Characteristics of Digital Integrated Circuits (PDF 1708 KB)
- Using High Speed CMOS and Advanced CMOS in Systems With Multiple Vcc (PDF 43 KB)
- HiRel Unitrode Power Management Brochure (PDF 206 KB)
- LOGIC Pocket Data Book (PDF 6001 KB)
- HiRel Unitrode Power Management Brochure (PDF 206 KB)
- Logic Cross-Reference (PDF 2938 KB)
