CD74AC164/CD74ACT164 8-Bit SIPO Shift Registers

Texas Instruments CD74AC164/CD74ACT164 8-Bit SIPO Shift Registers have two serial inputs (A and B) connected through an AND gate and an asynchronous clear (CLR). The device requires a high signal on both A and B to set the input data line high; a low signal on either will set the input data line low. Data at A and B can be changed while CLK is high or low, provided the minimum set-up time requirements are met.