CD74HC299ME4

高速CMOS逻辑8位通用移位寄存器;三态 High-Speed CMOS Logic 8-Bit Universal Shift Register; Three-State

Description

The ’HC259 and ’HCT299 are 8-bit shift/storage registers with three-state bus interface capability. The register has four synchronous-operating modes controlled by the two select inputs as shown in the mode select S0, S1 table. The mode select, the serial data DS0, DS7 and the parallel data I/O0 - I/O7 respond only to the low-to-high transition of the clock CP pulse. S0, S1 and data inputs must be stable one set up time prior to the clock positive transition.

Features

• Buffered Inputs

• Four Operating Modes: Shift Left, Shift Right, Load and Store

• Can be Cascaded for N-Bit Word Lengths

• I/O0 - I/O7 Bus Drive Capability and Three-State for Bus Oriented Applications

• Typical fMAX = 50MHz at VCC = 5V, CL = 15pF, TA = 25oC

• Fanout Over Temperature Range

  - Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads

  - Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads

• Wide Operating Temperature Range . . . -55oC to 125oC

• Balanced Propagation Delay and Transition Times

• Significant Power Reduction Compared to LSTTL Logic ICs

• HC Types

  - 2V to 6V Operation

  - High Noise Immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5V

• HCT Types

  - 4.5V to 5.5V Operation

  - Direct LSTTL Input Logic Compatibility, VIL= 0.8V Max, VIH = 2V Min

  - CMOS Input Compatibility, Il ≤ 1µA at VOL, VOH