Product status link M54HCxxx, M54HCTxxx M54HCxxx,.
54HC166 - High-Speed CMOS Logic 8-Bit Parallel-In/Serial-Out Shift Register
SN54HC166 - 8-BIT PARALLEL-LOAD SHIFT REGISTERS
CD54HC166 - 8-Bit Parallel-In/Serial-Out Shift Register
M54HC166 - Rad-hard high speed 2V to 6V CMOS logic
CD54HC166F3A - 8-Bit Parallel-In/Serial-Out Shift Register
54HC166 - Rad-hard high speed 2 to 6V CMOS logic