SN74LS668
SYNCHRONOUS 4-BIT UP/DOWN COUNTER (Texas Instruments)
SN74LS669
SYNCHRONOUS 4-BIT UP/DOWN COUNTER (Motorola)
SN74LS620
Octal Bus Transceiver (Texas Instruments)
SN74LS621
Octal Bus Transceiver (Texas Instruments)
SN74LS623
OCTAL BUS TRANSCEIVER (Motorola)
SN74LS623
Octal Bus Transceiver (Texas Instruments)
SN74LS624
VOLTAGE-CONTROLLED OSCILLATOR (Texas Instruments)
SN74LS625
VOLTAGE-CONTROLLED OSCILLATOR (Texas Instruments)
SN74LS626
VOLTAGE-CONTROLLED OSCILLATOR (Texas Instruments)
SN74LS627
VOLTAGE-CONTROLLED OSCILLATOR (Texas Instruments)