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SN74AS298AD Datasheet(PDF) 1 Page - Texas Instruments |
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SN74AS298AD Datasheet(HTML) 1 Page - Texas Instruments |
1 / 7 page SN74AS298A QUADRUPLE 2-INPUT MULTIPLEXER WITH STORAGE SDAS219B – DECEMBER 1983 – REVISED DECEMBER 1994 Copyright © 1994, Texas Instruments Incorporated 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 • Selects One of Two 4-Bit Data Sources and Synchronously Stores Data With System Clock • Applications: – Dual Source for Operands and Constants in Arithmetic Processor; Can Release Processor Register Files for Acquiring New Data – Implements Separate Registers Capable of Parallel Exchange of Contents, Yet Retains External Load Capability – Has Universal-Type Register for Implementing Various Shift Patterns, Including Compound Left-Right Capability • Package Options Include Plastic Small-Outline (D) Packages and Standard Plastic (N) 300-mil DIPs description The SN74AS298A is a quadruple 2-input multiplexer with storage that provides essentially the equivalent functional capabilities of two separate MSI functions (SN74AS157 and ′AS175A) in a 16-pin package. When the word-select (WS) input is low, word 1 (A1, B1, C1, D1) is applied to the flip-flops. A high input to WS causes the selection of word 2 (A2, B2, C2, D2). The selected word is clocked to the output terminals on the negative-going edge of the clock pulse. The SN74AS298A is characterized for operation from 0 °C to 70°C. FUNCTION TABLE INPUTS OUTPUTS† WS CLK QA QB QC QD L ↓ a1 b1 c1 d1 H ↓ a2 b2 c2 d2 X H QA0 QB0 QC0 QD0 † a1, a2, etc. = the level of steady-state input at A1, A2, etc. QA0, QB0, etc. = the level of QA, QB, etc. entered on the most recent ↓ transition of CLK D OR N PACKAGE (TOP VIEW) 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 B2 A2 A1 B1 C2 D2 D1 GND VCC QA QB QC QD CLK WS C1 PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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