MC54F646 データシートの表示（PDF） - Motorola => Freescale
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MC54F646 Datasheet PDF : 6 Pages
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MC54/74F646 • MC54/74F648
FUNCTION TABLE
OE bar DIR
Inputs
CPAB CPBA
SAB
SBA
Data I/O*
A0–A7 B0–B7
Operation/Function
H
X
H or L H or L
X
X
Input
Input Isolation
H
X
↑
H
X
X
H
X
↑
X
X
X
Input
Input Store An Data in A Register
↑
X
X
Input
Input Store Bn Data in B Register
↑
X
X
Input
Input Store An/Bn Data in A/B Register
L
H
X
X
L
X
Input
Output An to Bn — Real Time (Transparent Mode)
L
H
↑
X
L
X
Input
Output Store An Data in A Register
L
H
H or L
X
H
X
Input
Output A Register to Bn (Stored Mode)
L
H
↑
X
H
X
Input
Output Clock An Data to Bn and into A Register
L
L
X
X
X
L
Output
Input Bn to An — Real Time (Transparent Mode)
L
L
X
↑
X
L
Output
Input Store Bn Data in B Register
L
L
X
H or L
X
H
Output
Input B Register to An (Stored Mode)
L
L
X
↑
X
H
Output
Input Clock An Data to Bn and into B Register
*The data output function may be enabled or disabled by various signals at the OE bar 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.
H = HIGH voltage level
L = LOW voltage level
X = Don’t Care
↑ = Low-to-High transition
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
DC Supply Voltage
TA
Operating Ambient Temperature Range
IOH
Output Current High
IOL
Output Current Low
54, 74
54
74
54
74
54
74
Min
Typ
Max
Unit
4.5
5.0
5.5
V
–55
0
25
25
125
70
°C
—
—
—
—
–12
–15
mA
—
—
—
—
48
64
mA
FAST AND LS TTL DATA
4-242
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