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DM74AS258N View Datasheet(PDF) - Fairchild Semiconductor

Part NameDescriptionManufacturer
DM74AS258N 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers Fairchild
Fairchild Semiconductor Fairchild
DM74AS258N Datasheet PDF : 8 Pages
1 2 3 4 5 6 7 8
May 2007
DM74AS257, DM74AS258
tm
3-STATE Quad 1 of 2 Line Data Selector/Multiplexers
Features
Switching specifications at 50pF
Switching specifications guaranteed over full
temperature and VCC range
Advanced oxide-isolated, ion-implanted Schottky
TTL process
Functionally and pin for pin compatible with Schottky,
low power Schottky, and advanced low power
Schottky TTL counterpart
Improved AC performance over Schottky, low power
Schottky, and advanced low power Schottky
counterparts
3-STATE buffer-type output drive bus lines directly
Expand any data input point
Multiplex dual data buses
General four functions of two variables (one variable
is common)
Source programmable counters
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 DM74AS257 presents true data whereas the
DM74AS258 presents inverted data to minimize propa-
gation delay time.
This 3-STATE output feature means that n-bit (paral-
leled) data selectors with up to 300 sources can be
implemented for data buses. It also permits the use of
standard TTL registers for data retention throughout the
system.
Ordering Information
Order
Number
Package
Number
Package Description
DM74AS257M
DM74AS257N
DM74AS258M
M16A
N16E
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering number.
©1986 Fairchild Semiconductor Corporation
DM74AS257, DM74AS258 Rev. 1.2
www.fairchildsemi.com
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