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54LS245
Octal TRI-STATE Bus Transceiver
TL/F/6413
54LS245/DM54LS245/DM74LS245
TRI-STATE
Octal
Bus
Transceiver
June 1989
54LS245/DM54LS245/DM74LS245
TRI-STATEÉ Octal Bus Transceiver
General Description
These octal bus transceiversare designedfor asynchro-
nous two-way communication between data buses. The
control function implementation minimizes external timing
requirements.
The device allowsdata transmission fromtheAbustotheB
busor fromthe Bbustothe Abusdepending uponthe logic
levelatthe direction control (DIR) input. The enable input
(G)canbe usedto disablethe devicesothatthe busesare
effectively isolated.
Features Bi-Directional bus transceiverina high-density 20-pin
package TRI-STATE outputs drivebus lines directly PNP inputs reduceDC loadingonbus lines Hysteresisatbus inputs improve noise margins Typical propagation delay times, port-to-port8ns Typical enable/disable times17nsIOL (sink current)
54LS 12mA
74LS 24mA IOH (source current)
54LS b12mA
74LS b15mA Alternate Military/Aerospace device (54LS245)is avail-
able. Contacta National Semiconductor Sales Office/
Distributorfor specifications.
Connection Diagram
Dual-In-Line Package
TL/F/6413–1
OrderNumber54LS245DMQB, 54LS245FMQB,54LS245LMQB,
DM54LS245J, DM54LS245W, DM74LS245WMorDM74LS245N
See NSPackage Number E20A, J20A, M20B, N20AorW20A
Function Table
Enable Direction Operation Control
DIR L B datatoAbus H A datatoBbus X IsolationeHigh Level,LeLow Level,Xe Irrelevant
TRI-STATEÉ isaregistered trademarkof National SemiconductorCorporation.
C1995National SemiconductorCorporation RRD-B30M105/PrintedinU.S.A.
