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DM74ALS258N Folha de dados(PDF) 1 Page - Fairchild Semiconductor

Nome de Peças DM74ALS258N
Descrição Electrónicos  3-STATE Quad 1-of-2-Line Data Selector/Multiplexer
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Fabricante Electrônico  FAIRCHILD [Fairchild Semiconductor]
Página de início  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

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© 2000 Fairchild Semiconductor Corporation
DS006227
www.fairchildsemi.com
April 1984
Revised February 2000
DM74ALS257 • DM74ALS258
3-STATE Quad 1-of-2-Line Data Selector/Multiplexer
General Description
These data selectors/multiplexers contain inverters and
drivers to supply full on-chip data selection to the four 3-
STATE outputs that can interface directly with data lines of
bus-organized systems. A 4-bit word selected from one of
two
sources
is
routed
to
the
four
outputs.
The
DM74ALS257
presents
true
data
whereas
the
DM74ALS258 presents inverted data to minimize propaga-
tion delay time.
This 3-STATE output feature means that n-bit (paralleled)
data selectors with up to 258 sources can be implemented
for data buses. It also permits the use of standard TTL reg-
isters for data retention throughout the system.
Features
s Switching specifications at 50 pF
s Switching specifications guaranteed over full tempera-
ture and VCC range
s Advanced oxide-isolated, ion-implanted Schottky TTL
process
s Functionally and pin for pin compatible with Schottky
and low power Schottky TTL counterpart
s Improved AC performance over Schottky and low power
Schottky counterparts
s 3-STATE buffer-type outputs drive bus lines directly
s Expand any data input point
s Multiplex dual data buses
s General four functions of two variables (one variable is
common)
s Source programmable counters
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Function Table
H
= HIGH Level
L
= LOW Level
X
= Don't Care
Z
= High Impedance (OFF)
Order Number
Package Number
Package Description
DM74ALS257M
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
DM74ALS257SJ
M16D
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
DM74ALS257N
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
DM74ALS258M
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
DM74ALS258N
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Inputs
Output Y
Output
Select
A
B
DM74ALS257 DM74ALS258
Control
HX
X
X
Z
Z
LL
L
X
L
H
LL
H
X
H
L
LH
X
L
L
H
LH
X
H
H
L


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