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54ACTQ646 View Datasheet(PDF) - National ->Texas Instruments

Part NameDescriptionManufacturer
54ACTQ646 Quiet Series Octal Transceiver/Register with 3-STATE Outputs National-Semiconductor
National ->Texas Instruments National-Semiconductor
54ACTQ646 Datasheet PDF : 10 Pages
1 2 3 4 5 6 7 8 9 10
Real Time Transfer
A-Bus to B-Bus
Storage from
Bus to Register
DS100326-5
FIGURE 1.
Real Time Transfer
B-Bus to A-Bus
DS100326-7
FIGURE 3.
Transfer from
Register to Bus
DS100326-6
FIGURE 2.
DS100326-8
FIGURE 4.
Function Table
Inputs
Data I/O (Note 1)
Function
G DIR CPAB
H X H or L
CPBA SAB SBA A0–A7
H or L X X
B0– B7
Isolation
HX
N
X
X
HX
X
N
X
LH
X
X
L
LH
N
X
L
L H H or L
X
H
LH
N
X
H
LL
X
X
X
LL
X
N
X
LL
X
H or L X
LL
X
N
X
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
N = LOW-to-HIGH Transition
X
Input
Input Clock An Data into A Register
X
Clock Bn Data into B Register
X
An to Bn — Real Time (Transparent Mode)
X Input Output Clock An Data into A Register
X
A Register to Bn (Stored Mode)
X
Clock An Data into A Register and Output to Bn
L
Bn to An — Real Time (Transparent Mode)
L Output Input Clock Bn Data into B Register
H
B Register to An (Stored Mode)
H
Clock Bn Data into B Register and Output to An
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.
3
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