View bu4021b datasheet:

Standard ICs 8-bit static shift register BU4021B / BU4021BF The BU4021B and BU4021BF are 8-bit static shift registers consisting of 8 register cells, each of which has parallel input. Control of the parallel / serial control input (P / S) enables serial input / serial output with clock synchronization, as well as parallel input / serial output conversions. Absolute maximum ratings (VSS = 0V, Ta = 25°C) • Parameter Symbol Limits Unit Power supply voltage VDD – 0.3 ~ + 18 V Power dissipation Pd 1000 (DIP), 500 (SOP) mW Operating temperature Topr – 40 ~ + 85 °C Storage temperature Tstg – 55 ~ + 150 °C Input voltage VIN – 0.3 ~ VDD + 0.3 V Logic circuit diagram Block diagram • • P8 1 16 VDD P1 P2 P3 P4 P5 P6 P7 P8 P8 P7 (7) (6) (5) (4) (13) (14) (15) (1) P / S Q6 2 15 P7