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UCD4021B - CMOS 8-STAGE STATIC SHIFT REGISTERS

General Description

The UCD4021B is a 8-stage synchronous parallel or serial input/serial output registers having common CLOCK and PARALLEL/SERIAL CONTROL inputs, a SERIAL data input, and individual parallel inputs to each register stage.

Each register is a D-type, master-slave flip-flop.

Q6, Q7, and Q8 are outputs.

Key Features

  • S.
  • Up to 20V operation voltage.
  • 12MHz (Typ. ) clock rate at 10V.
  • Maximum input current of 1μA at 18V.
  • Fully static operation.
  • 8 master-slave flip-flops plus output buffering and control gating.

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UNISONIC TECHNOLOGIES CO., LTD UCD4021B Preliminary CMOS 8-STAGE STATIC SHIFT REGISTERS  DESCRIPTION The UCD4021B is a 8-stage synchronous parallel or serial input/serial output registers having common CLOCK and PARALLEL/SERIAL CONTROL inputs, a SERIAL data input, and individual parallel inputs to each register stage. Each register is a D-type, master-slave flip-flop. Q6, Q7, and Q8 are outputs. In UCD4021B serial entry is synchronous with the clock but parallel entry is asynchronous. In UCD4021B serial entry is controlled by the PARALLEL/SERIAL CONTROL input. When the PARALLEL/SERIAL CONTROL input is low, data is serially shifted into the 8-stage register synchronously with the positive transition of the clock line.