參數(shù)資料
型號： 74LCX32500
廠商： Fairchild Semiconductor Corporation
英文描述： Octal Buffers And Line Drivers With 3-State Outputs 20-SSOP -40 to 85
中文描述： 低電壓36位通用總線收發(fā)器和5V容限輸入和輸出
文件頁數(shù)： 2/8頁
文件大小： 85K
代理商： 74LCX32500
www.fairchildsemi.com
2
7
Connection Diagram
(Top Thru View)
Truth Table
(Note 4)
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial (HIGH or LOW, inputs may not float)
Z
=
High Impedance
Note 4:
A-to-B data flow is shown: B-to-A flow is similar but uses OEBA,
LEBA, and CLKBA.
Note 5:
Output level before the indicated steady-state input conditions
were established.
Note 6:
Output level before the indicated steady-state input conditions
were established, provided that CLKAB was LOW before LEAB went LOW.
Pin Descriptions
FBGA Pin Assignments
Functional Description
For A-to-B data flow, the LCX32500 operates in the trans-
parent mode when LEAB is HIGH. When LEAB is LOW,
the A data is latched if CLKAB is held at a HIGH or LOW
logic level. If LEAB is LOW, the A bus data is stored in the
latch/flip-flop on the HIGH-to-LOW transition of CLKAB.
Output-enable OEAB is active-HIGH. When OEAB is
HIGH, the outputs are active. When OEAB is LOW, the out-
puts are in the high impedance state.
Data flow for B to A is similar to that of A to B but uses
OEBA, LEBA, and CLKBA. The output enables are com-
plementary (OEAB is active HIGH and OEBA is active
LOW).
Inputs
Output
OEAB
n
L
H
H
H
H
H
H
LEAB
n
X
H
H
L
L
L
L
CLKAB
n
X
X
X
↓
↓
H
L
A
n
X
L
H
L
H
X
X
B
n
Z
L
H
L
H
B
0
(Note 5)
B
0
(Note 6)
Pin Names
1A
1
- 1A
18
2A
1
- 2A
18
1B
1
- 1B
18
2B
1
- 2B
18
CLKAB
1
, CLKBA
1
Clock Pulse Inputs
CLKAB
2
, CLKBA
2
LEAB
1
, LEBA
1
LEAB
2
, LEBA
2
OEAB
1
, OEBA
1
OEAB
2
, OEBA
2
Description
Data Register A Inputs/3-STATE Outputs
Data Register B Inputs/3-STATE Outputs
Latch Enable Inputs
Output Enable Inputs
1
2
3
4
5
6
A
B
C
D
E
F
G
H
1A
2
1A
4
1A
6
1A
8
1A
10
1A
12
1A
14
1A
15
1A
17
NC
2A
2
2A
4
2A
6
2A
8
2A
10
2A
12
2A
14
2A
15
2A
17
1A
1
1A
3
1A
5
1A
7
1A
9
1A
11
1A
13
1A
16
1A
18
LEAB
2
LEBA
1
2A
1
2A
3
2A
5
2A
7
2A
9
2A
11
2A
13
2A
16
2A
18
LEAB
1
OEAB
1
GND
V
CC
GND
GND
V
CC
GND
CLKAB
1
GND
GND
V
CC
GND
GND
V
CC
GND
1B
1
1B
3
1B
5
1B
7
1B
9
1B
11
1B
13
1B
16
1B
18
CLKAB
2
2B
1
2B
3
2B
5
2B
7
2B
9
2B
11
2B
13
2B
16
2B
18
1B
2
1B
4
1B
6
1B
8
1B
10
1B
12
1B
14
1B
15
1B
17
NC
2B
2
2B
4
2B
6
2B
8
2B
10
2B
12
2B
14
2B
15
2B
17
J
OEBA
1
CLKBA
1
K
L
M
N
P
R
T
U
GND
GND
GND
V
CC
GND
GND
V
CC
GND
OEAB
2
GND
V
CC
GND
GND
V
CC
GND
V
W
OEBA
2
CLKBA
2
LEBA
2
GND
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