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SN74AHCT257 Scheda tecnica(PDF) 1 Page - Texas Instruments |
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SN74AHCT257 Scheda tecnica(HTML) 1 Page - Texas Instruments |
1 / 7 page SN54AHCT257, SN74AHCT257 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SCLS351E – MAY 1996 – REVISED OCTOBER 1998 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 D Inputs Are TTL-Voltage Compatible D EPIC™ (Enhanced-Performance Implanted CMOS) Process D Package Options Include Plastic Small-Outline (D), Shrink Small-Outline (DB), Thin Very Small-Outline (DGV), Thin Shrink Small-Outline (PW), and Ceramic Flat (W) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) DIPs description These quadruple 2-line to 1-line data selectors/multiplexers are designed for 4.5-V to 5.5-V VCC operation. The ’AHCT257 devices are designed to multiplex signals from 4-bit data sources to 4-output data lines in bus-organized systems. The 3-state outputs do not load the data lines when the output-enable (OE) input is at the high logic level. To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. The SN54AHCT257 is characterized for operation over the full military temperature range of –55 °C to 125°C. The SN74AHCT257 is characterized for operation from –40 °C to 85°C. FUNCTION TABLE INPUTS OUTPUT OE A/B A B Y H X X X Z L LL X L L LH X H L HX L L L H X H H Copyright © 1998, Texas Instruments Incorporated PRODUCT PREVIEW information concerns products in the formative or design phase of development. Characteristic data and other specifications are design goals. Texas Instruments reserves the right to change or discontinue these products without notice. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. EPIC is a trademark of Texas Instruments Incorporated. SN54AHCT257 ...J OR W PACKAGE SN74AHCT257 . . . D, DB, DGV, N, OR PW PACKAGE (TOP VIEW) SN54AHCT257 . . . FK PACKAGE (TOP VIEW) 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 A/B 1A 1B 1Y 2A 2B 2Y GND VCC OE 4A 4B 4Y 3A 3B 3Y 32 1 20 19 910 11 1213 4 5 6 7 8 18 17 16 15 14 4A 4B NC 4Y 3A 1B 1Y NC 2A 2B NC – No internal connection |
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