參數(shù)資料
型號: 74ABT646CMTCX
廠商: FAIRCHILD SEMICONDUCTOR CORP
元件分類: 通用總線功能
英文描述: Single 8-bit Bus Transceiver
中文描述: ABT SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDSO24
封裝: 4.40 MM, MO-153, TSSOP-24
文件頁數(shù): 2/9頁
文件大?。?/td> 97K
代理商: 74ABT646CMTCX
www.fairchildsemi.com
2
7
Truth 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 OE 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
OE
DIR
CPAB
CPBA
SAB
SBA
A
0
–A
7
B
0
–B
7
H
X
H or L
H or L
X
X
Isolation
H
X
X
X
X
Input
Input
Clock A
n
Data into A Register
Clock B
n
Data into B Register
A
n
to B
n
Real Time (Transparent Mode)
Output Clock A
n
Data into A Register
A Register to B
n
(Stored Mode)
Clock A
n
Data into A Register and Output to B
n
B
n
to A
n
Real Time (Transparent Mode)
Input
Clock B
n
Data into B Register
B Register to A
n
(Stored Mode)
Clock B
n
Data into B Register and Output to A
n
H
X
X
X
X
L
H
X
X
L
X
L
H
X
L
X
Input
L
H
H or L
X
H
X
L
H
X
H
X
L
L
X
X
X
L
L
L
X
X
L
Output
L
L
X
H or L
X
H
L
L
X
X
H
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