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74ACTQ18823MTDX View Datasheet(PDF) - Fairchild Semiconductor

Part Name
Description
Manufacturer
74ACTQ18823MTDX
Fairchild
Fairchild Semiconductor Fairchild
74ACTQ18823MTDX Datasheet PDF : 6 Pages
1 2 3 4 5 6
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.
Logic Diagrams
Function Table
(Note 1)
Inputs
OE CLR EN CP
 H X L
 H X L
Internal Output
Function
In
Q
On
L
L
Z High Z
H
H
Z High Z
HL XXX
L
Z Clear
L LXXX
L
L Clear
H H H X X NC
Z Hold
L HHX X
NC
NC Hold
 H H L
L
L
Z Load
 H H L
H
H
Z Load
 L H L
L
L
L Load
 L H L
H
H
H Load
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.
Byte 1 (0:8)
Byte 2 (9:17)
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