74LVT652D PHILIPS [NXP Semiconductors], 74LVT652D Datasheet - Page 4

• Manufacturer Part Number: 74LVT652D
• Description: 3.3V Octal transceiver/register, non-inverting 3-State
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
The following examples demonstrate the four fundamental
bus-management functions that can be performed with the
74LVT652.
FUNCTION TABLE
H = High voltage level
L = Low voltage level
X = Don’t care
*
**
1998 Feb 19
3.3V Octal transceiver/register, non-inverting
(3-State)
OEAB
= Low-to-High clock transition
REAL TIME BUS TRANSFER
OEAB OEBA CPAB CPBA SAB SBA
X
H
H
H
H
L
L
L
L
L
L
L
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.
A
BUS B TO BUS A
L
OEBA
X
H
H
H
H
X
H
H
L
L
L
L
X
X
CPAB
H or L
H or L
H or L
H or L
INPUTS
X
X
X
B
L
CPBA
H or L
H or L
H or L
H or L
REAL TIME BUS TRANSFER
OEAB OEBA CPAB CPBA SAB SBA
X
X
X
H
A
BUS A TO BUS B
H
SAB
**
X
X
X
X
X
X
X
H
H
X
L
X
SBA
**
X
X
X
X
X
H
X
X
H
L
L
B
Unspecified**
X
Output*
Output
Output
Input
Input
Input
4
An
OEAB OEBA CPAB CPBA SAB SBA
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.
DATA I/O
X
L
L
A
A, B, OR A AND B
STORAGE FROM
H
H
X
Unspecified**
Output*
Output
Output
Input
Input
Input
X
Bn
X
X
X
X
Isolation
Store A and B data
Store A, Hold B
Store A in both registers
Hold A, Store B
Store B in both registers
Real time B data to A bus
Stored B data to A bus
Real time A data to B bus
Store A data to B bus
Stored A data to B bus
Stored B data to A bus
B
X
X
X
OEAB OEBA CPAB CPBA SAB SBA
OPERATING MODE
OPERATING MODE
TRANSFER STORED DATA
H
A
L
TO A OR B
H | L H | L
74LVT652
Product specification
H
SV00055
B
H