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74F646SPC.
Octal Transceiver/Register with TRI-STATE Outputs
TL/F/9580
54F/74F646
74F646B
54F/74F648
Octal
Transceiver/Register
with
TRI-STATE
Outputs
December 1994
54F/74F646# 74F646B# 54F/74F648
Octal Transceiver/Register with TRI-STATEÉ Outputs
General Description
These devices consistofbus transceiver circuits with TRI-
STATE, D-type flip-flops, and control circuitry arrangedfor
multiplexed transmissionof data directly fromthe inputbus fromthe internal registers. DataontheAorBbuswillbe
clockedintothe registersasthe appropriate clockpin goesa high logic level. ControlGand directionpinsare provid-to controlthe transceiver function.Inthe transceiver
mode, data presentatthe high impedance port maybe
storedin eithertheAortheB registerorin both.The select
controls can multiplex stored and real-time (transparent
mode) data. The direction control determines whichbuswill
receive data whenthe enable controlGis Active LOW.In
the isolation mode (controlG HIGH),A data maybe stored
intheB register and/orB data maybe storedintheA regis-
ter.
Features Independent registersforAandB buses Multiplexed real-time and stored data ’F648has inverting data paths ’F646/’F646B have non-inverting data paths ’F646Bisa faster versionofthe ’F646 TRI-STATE outputs 300mil slimDIP Guaranteed 4000V minimum ESD protection
Commercial Military Package Package DescriptionNumber
74F646SPC N24C 24-Lead (0.300× Wide)Molded Dual-In-Line
54F646DM (Note2) J24F 24-Lead (0.300×Wide) Ceramic Dual-In-Line
74F646SC(Note1) M24B 24-Lead (0.300× Wide)Molded SmallOutline, JEDEC
74F646MSA (Note1) MSA24 24-Lead Molded Shrink SmallOutline, EIAJ, TypeII
54F646FM (Note2) W24C 24-Lead Cerpack
54F646LM (Note2) E28A 28-Lead CeramicLeadless Chip Carrier,TypeC
74F646BSPC N24C 24-Lead (0.300× Wide)Molded Dual-In-Line
74F646BSC (Note1) M24B 24-Lead (0.300× Wide)Molded SmallOutline, JEDEC
74F648SPC N24C 24-Lead (0.300× Wide)Molded Dual-In-Line
54F648SDM (Note2) J24F 24-Lead (0.300× Wide)Ceramic Dual-In-Line
74F648SC(Note1) M24B 24-Lead (0.300× Wide)Molded SmallOutline, JEDEC
54F648FM (Note2) W24C 24-Lead Cerpack
54F648LM (Note2) E28A 24-Lead CeramicLeadless Chip Carrier,TypeC
Note1: Devices alsoavailablein13×reel.Use suffixe SCX.
Note2: Military grade device withenvironmentaland burn-in processing.Use suffixe DMQB, FMQBand LMQB.
Logic Symbols
’F646/’F646B
TL/F/9580–1
’F648
TL/F/9580–7
TRI-STATEÉ isaregistered trademarkof National SemiconductorCorporation.
C1995National SemiconductorCorporation RRD-B30M75/PrintedinU.S.A.
