PI74LCX646 查看數據表（PDF） - Pericom Semiconductor
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PI74LCX646 Datasheet PDF : 5 Pages
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PI74LCX646
PI74LCX652
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PI74LCX646
Product Pin Configuration
CPAB
SAB
DIR
A0
A1
A2
A3
A4
A5
A6
A7
GND
1
24
2
23
3
22
4 24-PIN 21
5 H24 20
6 L24 19
7 Q24 18
8 S24 17
9
16
10
15
11
14
12
13
VCC
CPBA
SBA
G
B0
B1
B2
B3
B4
B5
B6
B7
PI74LCX652
Product Pin Configuration
CPAB
SAB
GAB
A0
A1
A2
A3
A4
A5
A6
A7
GND
1
24
2
23
3
22
4 24-PIN 21
5 H24 20
6 L24 19
7 Q24 18
8 S24 17
9
16
10
15
11
14
12
13
VCC
CPBA
SBA
GBA
B0
B1
B2
B3
B4
B5
B6
B7
Product Pin Description
Pin Name
A0-A7
B0-B7
CPAB, CPBA
SAB, SBA
DIR, G
GAB, GBA
GND
VCC
Description
Data Register A Inputs
Data Register B Outputs
Data Register B Inputs
Data Register A Outputs
Clock Pulse Inputs
Output Data Source SelectInputs
Output Enable Inputs (LCX646)
Output Enable Inputs (LCX652)
Ground
Power
PI74LCX646 Truth Table
Function/Operation
Isolation
Store A and B Data
Real Time B Data to A Bus
Stored B Data to A Bus
Real Time A Data to B Bus
Stored A Data to B Bus
Inputs
DATA I/O(2)
G
DIR CPAB CPBA SAB SBA A0-A7 B0-B7
H
X H or L H or L X
X
Input Input
H
X
↑
↑
X
X
L
L
X
X
X
L Output Input
L
L
X H or L X
H
L
H
X
X
L
X
Input Output
L
H H or L X
H
X
PI74LCX652 Truth Table
Inputs
DATA I/O(2)
Function/Operation
GAB GBA CPAB CPBA SAB SBA
A0-A7
B0-B7
Isolation
Store A and B Data
L
H H or L H or L X
X
L
H
↑
↑
X
X
Input
Input
Store A, Hold B
Store A in Both Registers
X
H
↑
H or L X
X
H
H
↑
↑
X(2)
X
Input
Input
Unspecified(1)
Output
Hold A, Store B
Store B in Both Registers
L
X H or L
↑
L
L
↑
↑
X
X Unspecified(1)
X
X(2)
Output
Input
Input
Real Time B Data to A Bus
L
L
X
X
X
L
Output
Stored B Data to A Bus
L
L
X
H or L X
H
Input
Real Time A Data to B Bus
H
Stored A Data to B Bus
H
H
X
X
H H or L
X
L
X
H
X
Input
Output
Stored A Data to B Bus and H
Stored B Data to A Bus
L H or L H or L H
H
Output
Output
Notes:
1. The data output functions may be enabled or disabled by various signals at the GAB or GBA inputs. Data
input functions are always enabled, i.e., data at the bus pins will be stored on every low-to-high transition
on the clock inputs.
2. Select control = L: clocks can occur simultaneously.
Select control = H: clocks must be staggered to load both registers.
H = High Voltage Level; L = Low Voltage Level; X = Don't Care; ↑ = LOW-to-HIGH transition
2
PS2104A 02/07/97
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