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74ACTQ843SC Datasheet(PDF) 2 Page - Fairchild Semiconductor

Part No. 74ACTQ843SC
Description  Quiet Seriesa™ 9-Bit Transparent Latch with 3-STATE Outputs
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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Functional Description
The ACTQ843 consists of nine D-type latches with 3-
STATE outputs. The flip-flops appear transparent to the
data when Latch Enable (LE) is HIGH. This allows asyn-
chronous operation, as the output transition follows the
data in transition. On the LE HIGH-to-LOW transition, the
data that meets the setup times is latched. Data appears
on the bus when the Output Enable (OE) is LOW. When
OE is HIGH, the bus output is in the high impedance state.
In addition to the LE and OE pins, the ACTQ843 has a
Clear (CLR) pin and a Preset (PRE) pin. These pins are
ideal for parity bus interfacing in high performance sys-
tems. When CLR is LOW, the outputs are LOW if OE is
LOW. When CLR is HIGH, data can be entered into the
latch. When PRE is LOW, the outputs are HIGH if OE is
LOW. Preset overrides CLR.
Function Table
H
= HIGH Voltage Level
L
= LOW Voltage Level
X
= Immaterial
Z
= High Impedance
NC
= No Change
Logic Diagram
Inputs
Internal
Outputs
Function
CLR
PRE
OE
LE
D
Q
O
HHHH
L
L
Z
High Z
HHHHH
H
Z
High Z
H
H
H
L
X
NC
Z
Latched
H
H
L
H
L
L
L
Transparent
H
H
L
H
H
H
H
Transparent
H
H
L
L
X
NC
NC
Latched
H
L
L
X
X
H
H
Preset
L
H
L
X
X
L
L
Clear
LLL
X
X
H
H
Preset
L
H
H
L
X
L
Z
Clear/High Z
HL
HL
X
H
Z
Preset/High Z




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