74LVT652 查看數據表（PDF） - Philips Electronics
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74LVT652 Datasheet PDF : 14 Pages
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Philips Semiconductors
3.3V Octal transceiver/register, non-inverting
(3-State)
Product specification
74LVT652
The following examples demonstrate the four fundamental
bus-management functions that can be performed with the
74LVT652.
REAL TIME BUS TRANSFER REAL TIME BUS TRANSFER
BUS B TO BUS A
BUS A TO BUS B
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.
STORAGE FROM
A, B, OR A AND B
TRANSFER STORED DATA
TO A OR B
A
B
A
B
A
B
A
B
OEAB OEBA CPAB CPBA SAB SBA
L LXXXL
OEAB OEBA CPAB CPBA SAB SBA
HHXX L X
OEAB OEBA CPAB CPBA SAB
XH ↑ XX
LXX↑X
LH↑↑X
SBA
X
X
X
OEAB OEBA CPAB CPBA SAB SBA
H L H|L H|L H H
SV00055
FUNCTION TABLE
OEAB
OEBA
INPUTS
CPAB CPBA
SAB SBA
DATA I/O
An
Bn
OPERATING MODE
L
L
H
H or L H or L
X
X
H
↑
↑
X
X
Input
Input
Isolation
Store A and B data
X
H
H
H
↑
H or L
X
X
↑
↑
**
X
Input
Unspecified** Store A, Hold B
Output*
Store A in both registers
L
L
X
H or L
↑
L
↑
↑
X
X
X Unspecified**
**
Output*
Input
Hold A, Store B
Store B in both registers
L
L
L
L
X
X
X
X
L
H or L
X
H
Output
Input
Real time B data to A bus
Stored B data to A bus
H
H
H
X
X
H
H or L
X
L
X
H
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=
L=
X=
↑=
*
**
High voltage level
Low voltage level
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.
1998 Feb 19
4
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