常用电平及接口电平VIP免费

1 目 录 一.常用逻辑电平标准 .............................................................................................................. 2 1.1 COMS 电平 ................................................................................................................... 3 1.2 LVCOMS 电平 ............................................................................................................... 3 2.1 TTL 电平 ....................................................................................................................... 4 2.2 LVTTL 电平 ................................................................................................................... 4 3.1 LVDS 电平 ..................................................................................................................... 5 4.1 PECL(VCC=5V)/LVPECL(VCC=3.3V)电平 ....................................................................... 5 5.1 CML 电平 ...................................................................................................................... 6 6.1 VML 电平 ...................................................................................................................... 6 7.1 HSTL 电平 ..................................................................................................................... 6 7.2 SSTL 电平 ...................................................................................................................... 7 二．常用接口电平标准 ........................................................................................................... 7 1. RS232、RS485、 RS422 .............................................................................................. 7 2 DDR1 ,DDR2,DDR3 ......................................................................................................... 8 3 PCIE2. 0、PCIE3.0 .............................................................................