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DM74AS257N bảng dữ liệu(PDF) 1 Page - Fairchild Semiconductor |
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DM74AS257N bảng dữ liệu(HTML) 1 Page - Fairchild Semiconductor |
1 / 8 page tm May 2007 ©1986 Fairchild Semiconductor Corporation www.fairchildsemi.com DM74AS257, DM74AS258 Rev. 1.2 DM74AS257, DM74AS258 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 Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering number. Order Number Package Number Package Description DM74AS257M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow DM74AS257N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide DM74AS258M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow |
Số phần tương tự - DM74AS257N |
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Mô tả tương tự - DM74AS257N |
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