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74VHCT573AM bảng dữ liệu(PDF) 2 Page - Fairchild Semiconductor

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Giải thích chi tiết về linh kiện  Octal D-Type Latch with 3-STATE Outputs
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nhà sản xuất  FAIRCHILD [Fairchild Semiconductor]
Trang chủ  http://www.fairchildsemi.com
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©1997 Fairchild Semiconductor Corporation
www.fairchildsemi.com
74VHCT573A Rev. 1.3
2
Logic Symbol
IEEE/IEC
Truth Table
H
= HIGH Voltage Level
L
= LOW Voltage Level
X
= Immaterial
Z
= High Impedance
Functional Description
The VHCT573A contains eight D-type latches with
3-STATE output buffers. When the Latch Enable (LE)
input is HIGH, data on the Dn inputs enters the latches.
In this condition the latches are transparent, i.e., a latch
output will change state each time its D input changes.
When LE is LOW the latches store the information that
was present on the D inputs, a setup time preceding the
HIGH-to-LOW transition of LE. The 3-STATE buffers are
controlled by the Output Enable (OE) input. When OE is
LOW, the buffers are enabled. When OE is HIGH the
buffers are in the high impedance mode, but, this does
not interfere with entering new data into the latches.
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to
estimate propagation delays.
Inputs
Outputs
OE
LE
D
On
LH
H
H
LHL
L
LL
X
O0
HX
X
Z


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