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74ACT18823MTD Scheda tecnica(PDF) 2 Page - Fairchild Semiconductor

Il numero della parte 74ACT18823MTD
Spiegazioni elettronici  18-Bit D-Type Flip-Flop with 3-STATE Outputs
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Produttore elettronici  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

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Functional Description
The ACT18823 consists of eighteen D-type edge-triggered
flip-flops. These have 3-STATE outputs for bus systems
organized with inputs and outputs on opposite sides. The
device is byte controlled with each byte functioning identi-
cally, but independent of the other. The control pins can be
shorted together to obtain full 16-bit operation. The follow-
ing description applies to each byte. The buffered clock
(CPn) and buffered Output Enable (OEn) are common to all
flip-flops within that byte. The flip-flops will store the state
of their individual D inputs that meet set-up and hold time
requirements on the LOW-to-HIGH CPn transition. With
OEn LOW, the contents of the flip-flops are available at the
outputs. When OEn is HIGH, the outputs go to the imped-
ance state. Operation of the OEn input does not affect the
state of the flip-flops. In addition to the Clock and Output
Enable pins, there are Clear (CLRn) and Clock Enable
(ENn) pins. These devices are ideal for parity bus interfac-
ing in high performance systems.
When CLRn is LOW and OEn is LOW, the outputs are
LOW. When CLRn is HIGH, data can be entered into the
flip-flops. When ENn is LOW, data on the inputs is trans-
ferred to the outputs on the LOW-to-HIGH clock transition.
When the ENn is HIGH, the outputs do not change state,
regardless of the data or clock input transitions.
Function Table
(Note 1)
H
= HIGH Voltage Level
L
= LOW Voltage Level
X
= Immaterial
Z
= High Impedance
= LOW-to-HIGH Transition
NC
= No Change
Note 1: The table represents the logic for one byte. The two bytes are inde-
pendent of each other and function identically.
Logic Diagrams
Byte 1 (0:8)
Byte 2 (9:17)
Inputs
Internal Output
Function
OE
CLR
EN
CP
In
QOn
HX
L

L
L
Z
High Z
HX
L

H
H
Z
High Z
H
L
XXX
L
Z
Clear
L
L
XXX
L
L
Clear
H
H
H
X
X
NC
Z
Hold
LH
H
X
X
NC
NC
Hold
HH
L

L
L
Z
Load
HH
L

H
H
Z
Load
LH
L

L
L
L
Load
LH
L

H
H
H
Load


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