74F399 ,Quad 2-Port Register54F/74F398 54F/74F399Quad2-PortRegister#May199554F/74F398 54F/74F399#Quad2-PortRegisterGeneralDescr ..
74F399 ,Quad 2-Port Register
74F399PC ,Quad 2-Port RegisterFunctional Description Function TableThe 74F399 is a high-speed quad 2-port registers. TheyInputs O ..
74F399SC ,Quad 2-Port RegisterFeaturesThe 74F399 is the logical equivalent of a quad 2-input mul-
74F399
Quad 2-Port Register
TL/F/9533
54F/74F398
54F/74F399
Quad
2-Port
Register
May 1995
54F/74F398# 54F/74F399
Quad 2-Port Register
General Description
The ’F398and ’F399arethe logical equivalentsofa quad
2-input multiplexer feeding into four edge-triggered flip-
flops.A common Select input determines whichofthetwo
4-bit wordsis accepted. The selected data enterstheflip-
flopsonthe rising edgeofthe clock.The ’F399 isthe 16-pin
versionofthe ’F398,with onlytheQ outputsofthe flip-flops
available.
Features Select inputs fromtwo data sources Fully positive edge-triggered operation Both trueand complement outputsÐ’F398 Guaranteed 4000V minimum ESD protectionÐ’F399
Commercial Military Package Package DescriptionNumber
74F398PC N20A 20-Lead (0.300× Wide) Molded Dual-In-Line
54F398DM (Note2) J20A 20-Lead CeramicDual-In-Line
74F398SC (Note1) M20B 20-Lead (0.300× Wide) Molded Small Outline, JEDEC
54F398FM(Note2) W20A 20-Lead Cerpack
54F398LM (Note2) E20A 20-Lead CeramicLeadless Chip Carrier,TypeC
74F399PC N20A 20-Lead (0.300× Wide) Molded Dual-In-Line
54F399DM (Note2) J20A 20-Lead CeramicDual-In-Line
74F399SC (Note1) M20B 20-Lead (0.300× Wide) Molded Small Outline, JEDEC
74F399SJ (Note1) M20D 20-Lead (0.300× Wide) Molded Small Outline, EIAJ
54F399FM(Note2) W20A 20-Lead Cerpack
54F399LM (Note2) E20A 20-Lead CeramicLeadless Chip Carrier,TypeC
Note 1:Devicesalso availablein13×reel. UsesuffixeSCXandSJX.
Note 2:Militarygrade devicewith environmentaland burn-in processing.Use suffixe DMQB, FMQBandLMQB.
Connection Diagrams
’F398
Pin Assignment
forLCC
TL/F/9533–5
PinAssignment
for DIP, SOICand Flatpak
TL/F/9533–6
TRI-STATEÉ isaregistered trademarkof National SemiconductorCorporation.
C1995National SemiconductorCorporation RRD-B30M75/PrintedinU.S.A.
