SN74LS290D中文资料摩托罗拉数据手册PDF规格书

The SN54/74LS290 and SN54/74LS293 are high-speed 4-bit ripple type counters partitioned into two sections.

• Corner Power Pin Versions of the LS90 and LS93

• Low Power Consumption . . . Typically 45 mW

• High Count Rates . . . Typically 42 MHz

• Choice of Counting Modes . . . BCD, Bi-Quinary, Binary

• Input Clamp Diodes Limit High Speed Termination Effects