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74ACT373PC 数据表(PDF) 2 Page - Fairchild Semiconductor

部件名 74ACT373PC
功能描述  Octal Transparent Latch with 3-STATE Outputs
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制造商  FAIRCHILD [Fairchild Semiconductor]
网页  http://www.fairchildsemi.com
标志 FAIRCHILD - Fairchild Semiconductor

74ACT373PC 数据表(HTML) 2 Page - Fairchild Semiconductor

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©1988 Fairchild Semiconductor Corporation
www.fairchildsemi.com
74AC373, 74ACT373 Rev. 1.5.0
2
Connection Diagram
Pin Description
Functional Description
The AC/ACT373 contains eight D-type latches with
3-STATE standard outputs. 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-type input
changes. When LE is LOW, the latches store the infor-
mation that was present on the D-type inputs a setup
time preceding the HIGH-to-LOW transition of LE. The
3-STATE standard outputs are controlled by the Output
Enable (OE) input. When OE is LOW, the standard
outputs are in the 2-state mode. When OE is HIGH, the
standard outputs are in the high impedance mode but
this does not interfere with entering new data into the
latches.
Logic Symbols
IEEE/IEC
Truth Table
H
= HIGH Voltage Level
L
= LOW Voltage Level
Z
= High Impedance
X
= Immaterial
O0 = Previous O0 before HIGH-to-LOW transition
of Latch Enable
Pin Names
Description
D0–D7
Data Inputs
LE
Latch Enable Input
OE
Output Enable Input
O0–O7
3-STATE Latch Outputs
Inputs
Outputs
LE
OE
Dn
On
XHX
Z
HL
L
L
HLH
H
LL
X
O0


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