T9803 缓冲器/中继器

Description

T9803 缓冲器/中继器

特性
• 双通道双向缓冲器
• 在 B 侧集成了电流源，不需要外部 B 侧电阻器
• 超低功耗• 无静态电压偏移，低 VOL
• 与 I2C 总线和 SMBus 兼容• 在 A 侧上，工作电源电压范围为 0.8V 至 3.6V
• 在 B 侧上，工作电源电压范围为 1.65V 至 3.6V
• 高电平有效中继器使能输入
• A 侧断电高阻抗 I2C 总线引脚
• 断电反射功率保护 I2C 总线引脚
• 支持时钟拉伸和多主仲裁
• 0.5mA 至 3mA 的电流源选项系列

应用
• 服务器
• 路由器（路由设备）
• 工业设备• 个人计算机
• 功耗敏感型 应用

说明
T9803 是一款适用于 I2C 总线和 SMBus/PMBus 系统的双通道双向缓冲器。它在低电压（低至 0.8V）和较高电压（1.65V 至 3.6V）之间提供双向电平转换。T9803 在器件 B 侧 具有 一个内部电流源，因而 B侧不需要外部上拉电阻器。该电流源还提供改进的上升时间和超低功耗。

T9803能够在不使用静态电压偏移或增量偏移的情况下提供真正的缓冲（而不是 pass-FET 解决方案）。这意味着T9803的 A 侧和 B 侧上的 VOL 极低（约为 0.2V），有助于消除由于固定的 VIL 阈值导致的通信问题。TCA9803 的另一个重要特性是没有电源定序要求或电源依赖性。VCCA 可以大于、小于或等于VCCB。这使得系统设计人员可以灵活地使用T9803。

T9803

T9803 缓冲器/中继器

peculiarity
• Dual channel bidirectional buffer
• An integrated current source on the B side eliminates the need for an external B-side resistor
• Low power consumption • No static voltage offset, low VOL
• Compatible with I2C bus and SMBus • On the A side, the operating supply voltage range is 0.8V to 3.6V
• On the B side, the operating supply voltage range is 1.65V to 3.6V
• High level active repeater enables input
• Power off the high-impedance I2C bus pin on side A
• Power off reflects power to protect I2C bus pins
• Supports clock stretching and multi-master arbitration
• Range of current source options from 0.5mA to 3mA

Apply
• Server
• Router (routing device)
• Industrial equipment • Personal computers
• Power sensitive applications

Instructions
The T9803 is a dual-channel bidirectional buffer for I2C bus and SMBus/PMBus systems. It provides bidirectional level switching between low voltages (as low as 0.8V) and high voltages (1.65V to 3.6V). The T9803 has an internal current source on the B side of the device, so the B side does not require an external pull-up resistor. The current source also offers improved rise time and ultra-low power consumption.

The T9803 is capable of providing true buffering without the use of static voltage offset or incremental offset (as opposed to pass-FET solutions). This means that the VOL on the A and B sides of the T9803 is extremely low (around 0.2V), helping to eliminate communication issues due to fixed VIL thresholds. Another important feature of the TCA9803 is that there is no power sequencing requirement or power dependency. VCCA can be greater than, less than, or equal to VCCB. This gives system designers the flexibility to use the T9803.