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74LCX32652GX Arkusz danych(PDF) 4 Page - Fairchild Semiconductor

Numer części 74LCX32652GX
Szczegółowy opis  Low Voltage Transceiver/Register with 5V Tolerant Inputs and Outputs (Preliminary)
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Producent  FAIRCHILD [Fairchild Semiconductor]
Strona internetowa  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

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Preliminary
www.fairchildsemi.com
4
Functional Description
In the transceiver mode, data present at the HIGH imped-
ance port may be stored in either the A or B register or
both.
The select (SABn, SBAn) controls can multiplex stored and
real-time.
The examples below demonstrate the four fundamental
bus-management functions that can be performed with the
74LCX32652 for data register I/O 1A and 1B: 0 - 7.
Data on the A or B data bus, or both can be stored in the
internal D flip-flop by LOW-to-HIGH transitions at the
appropriate Clock Inputs (CPABn, CPBAn) regardless of
the Select or Output Enable Inputs. When SAB and SBA
are in the real time transfer mode, it is also possible to
store data without using the internal D flip-flops by simulta-
neously enabling OEABn and OEBAn. In this configuration
each Output reinforces its Input. Thus when all other data
sources to the two sets of bus lines are in a HIGH imped-
ance state, each set of bus lines will remain at its last state.
Real-Time
Transfer Bus B to Bus A
Real-Time
Transfer Bus A to Bus B
OEAB1 OEBA1 CPAB1 CPBA1
SAB1
SBA1
OEAB1 OEBA1 CPAB1 CPBA1
SAB1
SBA1
L
L
XXX
L
H
H
X
X
L
X
Transfer Storage
Data to A or B
Storage
OEAB1 OEBA1 CPAB1 CPBA1
SAB1
SBA1
OEAB1 OEBA1 CPAB1 CPBA1
SAB1
SBA1
H
L
H or L
H or L
H
H
X
H

XX
X
LX
X

XX
LH

XX


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