DM74ALS257

DM74ALS257, DM74ALS258 3-STATE Quad 1-of-2-Line Data Selector/Multiplexer

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DM74ALS257, DM74ALS258 3-STATE Quad 1-of-2-Line Data Selector/Multiplexer

May 2007

DM74ALS257, DM74ALS258 3-STATE Quad 1-of-2-Line Data Selector/Multiplexer
Features
Switching specifications at 50pF Switching specifications guaranteed over full

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 propagation 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 registers for data retention throughout the system.

temperature and VCC range
Advanced oxide-isolated, ion-implanted Schottky TTL

process
Functionally and pin for pin compatible with Schottky

and low power Schottky TTL counterpart
Improved AC performance over Schottky and low

power Schottky counterparts 3-STATE buffer-type outputs 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

Ordering Information
Order Number
DM74ALS257M DM74ALS257SJ DM74ALS258M

Package Number
M16A M16D M16A

Package Description
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm 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.

1984 Fairchild Semiconductor Corporation DM74ALS257, DM74ALS258 Rev. 1.2

www.fairchildsemi.com