MC74LVQ646 Datasheet, PDF (2/10 Pages) Motorola, Inc – LOW-VOLTAGE CMOS OCTAL TRANSCEIVER/ REGISTERED TRANSCEIVER

MC74LVQ646
CBA ¹
DIR ³
OE ²¹
SBA ²²
SAB ²
CAB ²³
A0
LOGIC DIAGRAM
C
Q
D
C
Q
D
B0
1 of 8 Channels
To 7 Other Channels
FUNCTION TABLE
Inputs
Storage
Registers
Data
Ports
Operating Mode
OE
DIR
CAB
CBA
SAB
SBA
QA
QB
An
Bn
Operating Mode
H
X
↑
↑
Input
Input
↑
X
X
NC
NC
X
X
Isolation, Hold Storage
↑
X
X
L
X
L
H
X
H
X
L
X
X
H
X
X
Store A and/or B Data
X
L
H
L
H
↑
Input
Output
X*
L
X
NC
NC
L
NC
NC
H
L
Real Time A Data to B Bus
H
H
X
NC
NC
X
↑
X*
L
X
L
NC
L
H
NC
H
QA
Stored A Data to B Bus
L
Real Time A Data to B Bus;
H
Store A Data
H
X
L
NC
L
H
NC
H
QA
Stored A Data to B Bus;
QA
Store A Data
L
L
Output
Input
X*
↑
X
L
NC
NC
L
NC
NC
H
L
Real Time B Data to A Bus
H
X
H
NC
NC
QB
X*
↑
X
L
NC
L
L
NC
H
H
X
Stored B Data to A Bus
L
Real Time B Data to A Bus;
H
Store B Data
X
H
NC
L
QB
NC
H
QB
L
Stored B Data to A Bus;
H
Store B Data
H = High Voltage Level; L = Low Voltage Level; X = Don’t Care; ↑ = Low–to–High Clock Transition; ↑ = NOT Low–to–High Clock Transition; NC = No Change; * = The
clocks are not internally gated with either the Output Enables or the Source Inputs. Therefore, data at the A or B ports may be clocked into the storage registers, at any
time. For ICC reasons, Do Not Float Inputs.
MOTOROLA
2
LVQ DATA
BR1478