SN74LVC4245A LJ245A  八路总线 收发器 移位器开发板

典型的双电源供电的双向收发器，通过DIR管脚控制传输方向。

收发器:收发器是信号转换的一种装置，通常是指光纤收发器。 光纤收发器的出现，将双绞线电信号和光信号进行相互转换，确保了数据包在两个网络间顺畅传输，同时它将网络的传输距离极限从铜线的100米扩展到100公里（单模光纤）。

This 8-bit (octal) noninverting bus transceiver contains two separate supply rails; B port has VCCB, which is set at 3.3 V, and A port has VCCA, which is set at 5 V. This allows for translation from a 3.3-V to a 5-V environment, and vice versa.

The SN74LVC4245A device is designed for asynchronous communication between data buses. The device transmits data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so the buses are effectively isolated. The control circuitry (DIR, OE) is powered by VCCA.

The SN74LVC4245A device terminal out allows the designer to switch to a normal all-3.3-V or all-5-V 20-terminal SN74LVC4245 device without board re-layout. The designer uses the data paths for pins 2–11 and 14–23 of the SN74LVC4245A device to align with the conventional ’245 terminal out.

• Bidirectional Voltage Translator
• 5.5 V on A Port and 2.7 V to 3.6 V on B Port
• Control Inputs VIH/VIL Levels Are 
  Referenced to VCCA Voltage
• Latch-Up Performance Exceeds 250 mA 
  Per JESD 17
• ESD Protection Exceeds JESD 22
  • 2000-V Human-Body Model
  • 200-V Machine Model
  • 1000-V Charged-Device Model
  • 芯片手册地址：
  • http://www.ti.com.cn/product/cn/SN74LVC4245A/description