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74LCX32500 Scheda tecnica(PDF) 2 Page - Fairchild Semiconductor

Il numero della parte 74LCX32500
Spiegazioni elettronici  Low Voltage 36-Bit Universal Bus Transceivers with 5V Tolerant Inputs and Outputs
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Produttore elettronici  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

74LCX32500 Scheda tecnica(HTML) 2 Page - Fairchild Semiconductor

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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
OEABn
LEABn
CLKABn
An
Bn
LX
X
X
Z
HH
X
L
L
HH
X
H
H
HL
LL
HL
HH
HL
H
X
B0 (Note 5)
HL
L
X
B0 (Note 6)
Pin Names
Description
1A1 - 1A18
Data Register A Inputs/3-STATE Outputs
2A1 - 2A18
1B1 - 1B18
Data Register B Inputs/3-STATE Outputs
2B1 - 2B18
CLKAB1, CLKBA1 Clock Pulse Inputs
CLKAB2, CLKBA2
LEAB1, LEBA1
Latch Enable Inputs
LEAB2, LEBA2
OEAB1, OEBA1
Output Enable Inputs
OEAB2, OEBA2
12
3
4
5
6
A
1A2
1A1
LEAB1 CLKAB1
1B1
1B2
B
1A4
1A3
OEAB1
GND
1B3
1B4
C
1A6
1A5
GND
GND
1B5
1B6
D
1A8
1A7
VCC
VCC
1B7
1B8
E
1A10
1A9
GND
GND
1B9
1B10
F
1A12
1A11
GND
GND
1B11
1B12
G
1A14
1A13
VCC
VCC
1B13
1B14
H
1A15
1A16
GND
GND
1B16
1B15
J
1A17
1A18
OEBA1 CLKBA1
1B18
1B17
K
NC
LEAB2 LEBA1
GND
CLKAB2
NC
L
2A2
2A1
OEAB2
GND
2B1
2B2
M
2A4
2A3
GND
GND
2B3
2B4
N
2A6
2A5
VCC
VCC
2B5
2B6
P
2A8
2A7
GND
GND
2B7
2B8
R
2A10
2A9
GND
GND
2B9
2B10
T
2A12
2A11
VCC
VCC
2B11
2B12
U
2A14
2A13
GND
GND
2B13
2B14
V
2A15
2A16
OEBA2 CLKBA2
2B16
2B15
W
2A17
2A18
LEBA2
GND
2B18
2B17


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