SN74HCS166/SN74HCS166-Q1 Shift Registers Texas Instruments SN74HCS166/SN74HCS166-Q1 8-Bit Parallel-Load Shift Registers contains an 8-bit shift register with one serial input and eight parallel-load inputs. The Texas Instruments SN74HCS166-Q1 devices are AEC-Q100 qualified for automotive applications.