SN74LS540DBR
SN74LS540DBRE4
SN74LS540DBRG4
SN74LS540DW
SN74LS540DWE4
SN74LS540DWG4
SN74LS540DWR
SN74LS540DWRE4
SN74LS540DWRG4
SN74LS540J