SN74FB2040中文资料8 位、TTL/BTL 收发器数据手册TI规格书

描述 Description

The SN74FB2040 is an 8-bit transceiver designed to translate signals between TTL and backplane transceiver logic (BTL) environments.
The B\\ port operates at BTL-signal levels. The open-collector B\\ ports are specified to sink 100 mA. Two output enables (OEB and OEB\\) are provided for the B\\ outputs. When OEB is high and OEB\\ is low, the B\\ port is active and reflects the inverse of the data present at the A-input pins. When OEB is low, OEB\\ is high, or VCC is less than 2.1 V, the B\\ port is turned off.
The A port operates at TTL-signal levels and has separate input and output pins. The A outputs reflect the inverse of the data at the B\\ port when the A-port output enable (OEA) is high. When OEA is low or when VCC is less than 2.1 V, the A outputs are in the high-impedance state.
The pins TMS, TCK, TDI, and TDO are nonfunctional, i.e., not intended for use with the IEEE Std 1149.1 (JTAG) test bus. TMS and TCK are not connected, and TDI is shorted to TDO.
BIAS VCC establishes a voltage between 1.62 V and 2.1 V on the BTL outputs when VCC is not connected.

特性 Features

• Compatible With IEEE Std 1194.1-1991 (BTL)
• TTL A Port, Backplane Transceiver Logic (BTL) B\\ Port
• Open-Collector B\\-Port Outputs Sink 100 mA
• High-Impedance State During Power Up and Power Down
• BIAS VCC Pin Minimizes Signal Distortion During Live Insertion or Withdrawal
• B\\-Port Biasing Network Preconditions the Connector and PC Trace to the BTL High-Level Voltage

简介

SN74FB2040属于集成电路（IC）的专用逻辑器件。由TI制造生产的SN74FB2040专用逻辑器件专用逻辑 IC 设计提供应用特定的逻辑输出类型，例如 BCD 速率倍增、可寻址扫描端口、总线终端阵列、CML 驱动器、比较器、ABT 扫描测试、二进制全加法器、互补对加逆变器、可配置缓冲器、触点颤动消除器、晶体振荡器、延迟元件、差分接收器、LVTTL 到 GTLP 收发器、存储器解码器、电源良好检测器和分频器。