PI74LPT16646 Ver la hoja de datos (PDF) - Pericom Semiconductor Corporation
Número de pieza
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Lista de partido
PI74LPT16646 Datasheet PDF : 6 Pages
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PI74LPT16646
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Product Pin Description
Pin Name
xOE, xDIR
xCLKAB, xCLKBA
xSAB, xSBA
xAx
xBx
GND
VCC
Description
Output Enable Inputs (Active LOW)
Clock Pulse Inputs
Output Data Source Select Inputs
Data Register A Inputs
Data Register B Outputs
Data Register B Inputs
Data Register A Outputs
Ground
Power
Product Pin Configuration
1DIR
1CLKAB
1SAB
GND
1A1
1A2
Vcc
1A3
1A4
1A5
GND
1A6
1A7
1A8
2A1
2A2
2A3
GND
2A4
2A5
2A6
VCC
2A7
2A8
GND
2SAB
2CLKAB
2DIR
1
56
2
55
3
54
4
53
5
52
6
51
7
50
8
49
9
48
10
47
11
46
12 56-PIN 45
13 V56 44
14 A56 43
15
42
16
41
17
40
18
39
19
38
20
37
21
36
22
35
23
34
24
33
25
32
26
31
27
30
28
29
1OE
1CLKBA
1SBA
GND
1B1
1B2
VCC
1B3
1B4
1B5
GND
1B6
1B7
1B8
2B1
2B2
2B3
GND
2B4
2B5
2B6
VCC
2B7
2B8
GND
2SBA
2CLKBA
2OE
Truth Table(2)
Inputs
Function
xOE xDIR xCLKAB xCLKBA xSAB xSBA
Isolation
Store A and B Data
H
X
H or L
H
X
↑
H or L
↑
X
X
X
X
Real Time B Data to A Bus
L
L
X
Stored B Data to A Bus
L
L
X
X
H or L
X
L
X
H
Real Time A Data to B Bus
L
H
X
Stored A Data to B Bus
L
H
H or L
X
L
X
X
H
X
Data I/O(1)
xAx
xBx
Input
Input
Output
Input
Input
Output
Note:
1. The data output functions may be enabled or disabled by various signals at the xOE or xDIR 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. H = High Voltage Level, X = Don't Care,
L = Low Voltage Level, ↑= LOW-to-HIGH Transition
2
PS2073A 01/16/97
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