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
