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DM74ALS253M bảng dữ liệu(PDF) 1 Page - Fairchild Semiconductor

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Giải thích chi tiết về linh kiện  3-STATE Dual 1-of-4 Line Data Selector/Multiplexer
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© 2000 Fairchild Semiconductor Corporation
DS006215
www.fairchildsemi.com
April 1984
Revised February 2000
DM74ALS253
3-STATE Dual 1-of-4 Line Data Selector/Multiplexer
General Description
This Data Selector/Multiplexer contains full on-chip decod-
ing to select one-of-four data sources as a result of a
unique two-bit binary code at the Select Inputs. Each of the
two Data Selector/Multiplexer circuits have their own sepa-
rate Data and Output Control inputs and a non-inverting 3-
STATE output buffer. The Output Control inputs, when at
the high level, place the corresponding output in the high
impedance OFF-State. In order to prevent bus access con-
flicts, output disable times are shorter than output enable
times. The Select input buffers incorporate internal overlap
features to ensure that select input changes do not cause
invalid output transients.
Features
s Advanced oxide-isolated, ion-implanted Schottky TTL
process
s Switching performance is guaranteed over full tempera-
ture and VCC supply range
s Pin and functional compatible with LS family counterpart
s Improved output transient handling capability
s Output control circuitry incorporates power-up 3-STATE
feature
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Function Table
Address inputs A and B are common to both sections
H
= HIGH Level
L
= LOW Level
X
= Don't Care
Z
= High Impedance
Order Number
Package Number
Package Description
DM74ALS253M
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
DM74ALS253N
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Select
Data Inputs
Output
Output
Inputs
Control
B
A
C0
C1C2C3
G
Y
X
X
XXX
X
H
Z
LL
L
X
X
X
L
L
LL
H
X
X
X
L
H
LH
X
L
X
X
L
L
LH
X
H
X
X
L
H
HL
X
X
L
X
L
L
HL
X
X
H
X
L
H
H
H
XXX
L
L
L
H
H
XXX
H
L
H


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