74ALS651-1D 查看數據表（PDF） - Philips Electronics
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74ALS651-1D Datasheet PDF : 13 Pages
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Philips Semiconductors
Transceiver/register
LOGIC DIAGRAM – 74ALS651/651-1
21
OEBA
3
OEAB
CPBA
SBA
23
22
SPAB
SAB
1
2
1 OF 8 CHANNELS
1D
C1
4
A0
1D
C1
Product specification
74ALS651/74ALS651-1
74ALS652/74ALS652-1
20
B0
LOGIC DIAGRAM – 74ALS652/652-1
21
OEBA
3
OEAB
CPBA
SBA
23
22
SPAB
SAB
1
2
1 OF 8 CHANNELS
1D
C1
4
A0
1D
C1
20
B0
VCC = Pin 24
GND = Pin 12
TO 7 OTHER CHANNELS
SC00134
VCC = Pin 24
GND = Pin 12
TO 7 OTHER CHANNELS
SC00135
FUNCTION TABLE
INPUTS
DATA I/O
OPERATING MODE
OEAB OEBA CPAB CPBA SAB SBA
An
Bn
74ALS651/74ALS651-1 74ALS652/74ALS652-1
L
H H or L H or L X
X
Input
Input
Isolation
Isolation
L
H
↑
↑
X
X
Input
Input
Store A and B data
Store A and B data
X
H
↑ H or L X
X
Input
Unspecified*
Store A, hold B
Store A, hold B
H
H
↑
↑
L
X
Input
Output
Store A in both registers Store A in both registers
L
X H or L ↑
X
S Unspecified*
Input
Hold A, store B
Hold A, store B
L
L
↑
↑
X
L
Output
Input
Store B in both registers Store B in both registers
L
L
X
X
X
L
Output
Input
Real time B data to A bus Real time B data to A bus
L
L
X H or L X
H
Output
Input
Stored B data to A bus
Stored B data to A bus
H
H
X
X
L
X
Input
Output
Real time A data to B bus Real time A data to B bus
H
H H or L X
H
X
Input
Output
Stored A data to B bus
Stored A data to B bus
H
L H or L H or L H
H
Output
Output
Stored A data to B bus
Stored A data to B bus
H
L H or L H or L H
H
Output
Output
Stored B data to A bus
Stored B data to A bus
NOTES:
H = High voltage level
L = Low voltage level
X = Don’t care
* = The data output function 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 clock.
↑ = Low-to-High clock transition
1991 Feb 08
5
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