• - 交流-直流(AC-DC)控制器和稳压器
• - 直流-直流(DC-DC)控制器、转换器和稳压器
• - 电压和电流管理
• - 通讯IC
• - 驱动器
• - 热管理

• - 时钟及数据分配
• - 标准逻辑

• - 放大器和比较器
• - 模拟开关
• - 数字电位计
• - 接口
• - EMI和RFI滤波器

• - EEPROM存储器
• - 非易失性只读存储器(NVRAM)
• - SRAM存储器

说明

The SN55121 and SN75121 dual line drivers are designed for digital data transmission over lines having impedances from 50 to 500 . They are also compatible with standard TTL logic and supply-voltage levels.

The low-impedance emitter-follower outputs of the SN55121 and SN75121 can drive terminated lines such as coaxial cable or twisted pair. Having the outputs uncommitted allows wired-OR logic to be performed in party-line applications. Output short-circuit protection is provided by an internal clamping network that turns on when the output voltage drops below approximately 1.5 V. All of the inputs are in conventional TTL configuration and the gating can be used during power-up and power-down sequences to ensure that no noise is introduced to the line.

特性

• Designed for Digital Data Transmission Over 50- Coaxial Cable, Strip Line, or Twisted Pair
• High Speed
• t_pd = 20 ns Maximum at C_L = 15 pF
• TTL Compatible With Single 5-V Supply
• 2.4-V Output at I_OH = -75 mA
• Uncommitted Emitter-Follower Output Structure for Party-Line Operation
• Short-Circuit Protection
• AND-OR Logic Configuration
• Designed for Use With Triple Line Receivers SN55122, SN75122
• Designed to Be Interchangeable With Signetics N8T13