CD54/74HC123, CD54/74HCT123, CD74HC423, CD74HCT423PinoutFunctional DiagramCD54HC123, CD54HCT1231Cx1Rx(CERDIP)VCD74HC123CC1415(PDIP, SOIC, SOP, TSSOP)1Cx1RxCxCD74HC42313(PDIP, SOIC, SOP)1A1Q1CD74HCT123, CD74HCT423MONO 14(PDIP, SOIC)1B1Q TOP VIEW 21R31A116 VCC111B215 1R2RXCX951R314 1CX2A2Q1Q413 1QMONO 210122B2Q2Q512 2Q2Cx2RxCx2C611X2R672R710XCX2BVCC2Cx2RxGND89 2ATRUTH TABLEINPUTSOUTPUTSABRQQCD74HC/HCT123 H X H L H X L H L H L ↑ H ↓ H H X X L L H L H ↑ CD74HC/HCT423 H X H L H X L H L H L ↑ H ↓ H H X X L L H H = High Voltage Level, L = Low Voltage Level, X = Don’t Care. 2