Philips Semiconductors Product specification
74LVT652
3.3V Octal transceiver/register, non-inverting
(3-State)
1998 Feb 19
4
The following examples demonstrate the four fundamental
bus-management functions that can be performed with the
74LVT652.
The select pins determine whether data is stored or transferred
through the device in real time.
The output enable pins determine the direction of the data flow.
}
REAL TIME BUS TRANSFER
BUS B TO BUS A
OEAB OEBA CPAB CPBA SAB SBA
LLXXXL
}
REAL TIME BUS TRANSFER
BUS A TO BUS B
OEAB OEBA CPAB CPBA SAB SBA
HHXXLX
}
STORAGE FROM
A, B, OR A AND B
OEAB OEBA CPAB CPBA SAB SBA
XH↑ XXX
LXX↑ XX
LH↑↑XX
}
TRANSFER STORED DATA
TO A OR B
OEAB OEBA CPAB CPBA SAB SBA
H L H | L H | L H H
A A
A
A
B B B B
SV00055
FUNCTION TABLE
INPUTS DATA I/O
OEAB OEBA CPAB CPBA SAB SBA An Bn
L
L
H
H
H or L
↑
H or L
↑
X
X
X
X
Input Input
Isolation
Store A and B data
X
H
H
H
↑
↑
H or L
↑
X
**
X
X
Input
Unspecified**
Output*
Store A, Hold B
Store A in both registers
L
L
X
L
H or L
↑
↑
↑
X
X
X
**
Unspecified**
Output*
Input
Hold A, Store B
Store B in both registers
L
L
L
L
X
X
X
H or L
X
X
L
H
Output Input
Real time B data to A bus
Stored B data to A bus
H
H
H
H
X
H or L
X
X
L
H
X
X
Input Output
Real time A data to B bus
Store A data to B bus
H L H or L H or L H H Output Output
Stored A data to B bus
Stored B data to A bus
H = High voltage level
L = Low voltage level
X = Don’t care
↑ = Low-to-High clock transition
* The data output function may be enabled or disabled by various signals at the OEBA
and OEAB inputs. Data input functions are always
enabled, i.e., data at the bus pins will be stored on every Low-to-High transition of the clock.
** If both Select controls (SAB and SBA) are Low, then clocks can occur simultaneously. If either Select control is High, the clocks must be
staggered in order to load both registers.