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74ACT646SC Datenblatt(PDF) 2 Page - Fairchild Semiconductor

Teilenummer 74ACT646SC
Bauteilbeschribung  Octal Transceiver/Register with 3-STATE Outputs
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Hersteller  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

74ACT646SC Datenblatt(HTML) 2 Page - Fairchild Semiconductor

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Function Table
H
= HIGH Voltage Level
L
= LOW Voltage Level
X
= Immaterial
 = LOW-to-HIGH Transition
Note 1: The data output functions may be enabled or disabled by various signals at the G and DIR 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 appropriate clock inputs.
Real Time Transfer
A-Bus to B-Bus
FIGURE 1.
Real Time Transfer
B-Bus to A-Bus
FIGURE 2.
Storage from
Bus to Register
FIGURE 3.
Transfer from
Register to Bus
FIGURE 4.
Inputs
Data I/O (Note 1)
Function
G
DIR
CPAB CPBA
SAB
SBA
A0–A7
B0–B7
H
X
H or L
H or L
X
X
Isolation
HX

X
X
X
Input
Input
Clock An Data into A Register
HX
X

X
X
Clock Bn Data into B Register
LH
X
X
L
X
An to Bn—Real Time (Transparent Mode)
LH

X
L
X
Input
Output Clock An Data into A Register
L
H
H or L
X
H
X
A Register to Bn (Stored Mode)
LH

X
H
X
Clock An Data into A Register and Output to Bn
LL
X
X
X
L
Bn to An —Real Time (Transparent Mode)
LL
X

X
L
Output
Input
Clock Bn Data into B Register
L
L
X
H or L
X
H
B Register to An (Stored Mode)
LL
X

X
H
Clock Bn Data into B Register and Output to An


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