DM74AS257

DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers

Datasheet preview, take a look at Datasheets before downloading (Data Sheet is available on manufacturer site)

DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers

May 2007

DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers
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 DM74AS257 presents true data whereas the DM74AS258 presents inverted data to minimize propagation delay time. This 3-STATE output feature means that n-bit (paralleled) 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.

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

Ordering Information
Order Number
DM74AS257M DM74AS257N DM74AS258M

Package Number
M16A N16E M16A

Package Description
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