74lvth652 Fairchild Semiconductor, 74lvth652 Datasheet - Page 2

• Manufacturer Part Number: 74lvth652
• Description: Low Voltage Octal Transceiver/register With 3-state Outputs
• Manufacturer: Fairchild Semiconductor

www.fairchildsemi.com
Pin Descriptions
Truth Table
(Note 1)
H
Note 1: The data output functions may be enabled or disabled by various signals at OEAB or OEBA inputs. Data input functions are always enabled, i.e.,
data at the bus pins will be stored on every LOW-to-HIGH transition on the clock inputs.
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
A
B
CPAB, CPBA
SAB, SBA
OEAB, OEBA
0
0
OEAB OEBA
HIGH Voltage Level
–A
–B
X
H
H
H
H
L
L
L
L
L
L
Pin Names
7
7
H
H
H
H
X
H
H
L
L
L
L
CPAB
H or L
H or L
H or L
H or L
L




Data Register A Inputs/
3-STATE Outputs
Data Register B Inputs/
3-STATE Outputs
Clock Pulse Inputs
Select Inputs
Output Enable Inputs
X
X
X
LOW Voltage Level
Inputs
CPBA
H or L
H or L
H or L
H or L




X
X
X
Description
SAB
X
X
X
X
X
X
X
X
X
H
H
L
Immaterial
SBA
H
H
X
X
X
X
X
X
L
X
X
Input
Input
Input
Not Specified
Output
Output
Input
Output
A

0
2
thru A
Connection Diagram
LOW to HIGH Clock Transition
Inputs/Outputs
7
Input
Not Specified
Output
Input
Input
Input
Output
Output
B
0
thru B
7
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
Store B Data to A Bus
Real-Time A Data to B Bus
Stored A Data to B Bus
Stored A Data to B Bus and
Stored B Data to A Bus
Operating Mode