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74LCX16500G Datasheet(PDF) 2 Page - Fairchild Semiconductor

No. de pieza 74LCX16500G
Descripción Electrónicos  Low Voltage 18-Bit Universal Bus Transceivers with 5V Tolerant Inputs and Outputs
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Fabricante Electrónico  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

74LCX16500G Datasheet(HTML) 2 Page - Fairchild Semiconductor

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Connection Diagrams
Pin Assignment for SSOP and TSSOP
Pin Assignment for FBGA
(Top Thru View)
Pin Descriptions
FBGA Pin Assignments
Truth Table (Note 4)
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.
Functional Description
For A-to-B data flow, the LCX16500 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).
Pin Names
Description
A1 - A18
Data Register A Inputs/3-STATE Outputs
B1 - B18
Data Register B Inputs/3-STATE Outputs
CLKAB, CLKBA Clock Pulse Inputs
LEAB, LEBA
Latch Enable Inputs
OEBA, OEBA
Output Enable Inputs
12
3
4
5
6
A
A2
A1
OEAB
GND
B1
B2
B
A4
A3
LEAB
CLKAB
B3
B4
C
A6
A5
VCC
VCC
B5
B6
D
A8
A7
GND
GND
B7
B8
E
A10
A9
GND
GND
B9
B10
F
A12
A11
GND
GND
B11
B12
G
A14
A13
VCC
VCC
B13
B14
H
A16
A15
OEBA CLKBA
B15
B16
J
A17
A18
LEBA
GND
B18
B17
Inputs
Output
OEAB
LEAB
CLKAB
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)


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