SN54LS320, SN54LS321, SN74LS320, SN74LS321 CRYSTAL.
Texas Instruments
SN54LS321 - CRYSTAL-CONTROLLED OSCILLATORS
SN54LS320, SN54LS321, SN74LS320, SN74LS321 CRYSTAL-CONTROLLED OSCILLATORS SDLS158 – DECEMBER 1978 – REVISED MARCH 1988 PRODUCTION DATA information is.
