SN54LS668, SN54LS669, SN74LS668, SN74LS669 SYNCHRO.
Texas Instruments
SN74LS668 - SYNCHRONOUS 4-BIT UP/DOWN COUNTER
SN54LS668, SN54LS669, SN74LS668, SN74LS669 SYNCHRONOUS 4-BIT UP/DOWN COUNTERS SDLS192 – APRIL 1977 – REVISED MARCH 1988 PRODUCTION DATA information i.
