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Fairchild Semiconductor - 3-STATE Dual 1-of-4 Line Data Selector/Multiplexer

Numéro de référence DM74ALS253
Description 3-STATE Dual 1-of-4 Line Data Selector/Multiplexer
Fabricant Fairchild Semiconductor 
Logo Fairchild Semiconductor 





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DM74ALS253 fiche technique
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:
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
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Function Table
Select
Data Inputs
Output
Inputs
Control
B A C0 C1 C2 C3
G
XX X X X X
H
LL L X X X
L
LL H X X X
L
LH X L X X
L
LH X H X X
L
HL X X L X
L
HL X X H X
L
HH X X X L
L
HH X X X H
L
Address inputs A and B are common to both sections
H = HIGH Level
L = LOW Level
X = Don't Care
Z = High Impedance
Output
Y
Z
L
H
L
H
L
H
L
H
© 2000 Fairchild Semiconductor Corporation DS006215
www.fairchildsemi.com

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