Detail specification for electronic component . semiconductor integrated circuit . type ch2021 4 - bit up down synchronous binary counter dual clock 电子元器件详细规范.半导体集成电路ch2021型4位二进制同步加减计数器
2.
Detail specification for electronic components . semiconductor integrated circuit ct54161 ct74161 4 - bit synchronous binary counter direct clear 电子元器件详细规范.半导体集成电路ct54161 ct74161型4位二进制同步计数器异步清除
