SN74LS540NE4
SN74LS540NS
SN74LS540NSE4
SN74LS540NSG4
SN74LS540N-SN74ALS540N
SN74LS540NSR
SN74LS540NSRE4
SN74LS540NSRG4
SN74LS541DB
SN74LS541DBE4