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SN74ALS299DWR Datenblatt(PDF) 1 Page - Texas Instruments |
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SN74ALS299DWR Datenblatt(HTML) 1 Page - Texas Instruments |
1 / 17 page SN54ALS299, SN74ALS299 8-BIT UNIVERSAL SHIFT/STORAGE REGISTERS WITH 3-STATE OUTPUTS SDAS220B – DECEMBER 1982 – REVISED DECEMBER 1994 Copyright © 1994, Texas Instruments Incorporated 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 • Multiplexed I/O Ports Provide Improved Bit Density • Four Modes of Operation: – Hold (Store) – Shift Right – Shift Left – Load Data • Operate With Outputs Enabled or at High Impedance • 3-State Outputs Drive Bus Lines Directly • Can Be Cascaded for n-Bit Word Lengths • Direct Overriding Clear • Applications: – Stacked or Push-Down Registers – Buffer Storage – Accumulator Registers • Package Options Include Plastic Small-Outline (DW) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs description These 8-bit universal shift /storage registers feature multiplexed I/O ports to achieve full 8-bit data handling in a single 20-pin package. Two function-select (S0, S1) inputs and two output- enable (OE1, OE2) inputs can be used to choose the modes of operation listed in the function table. Synchronous parallel loading is accomplished by taking both S0 and S1 high. This places the 3-state outputs in the high-impedance state and permits data applied on the I/O ports to be clocked into the register. Reading out of the register can be accomplished while the outputs are enabled in any mode. Clearing occurs asynchronously when the clear (CLR) input is low. Taking either OE1 or OE2 high disables the outputs, but has no effect on clearing, shifting, or storing data. The SN54ALS299 is characterized for operation over the full military temperature range of – 55 °C to 125°C. The SN74ALS299 is characterized for operation from 0 °C to 70°C. 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 S0 OE1 OE2 G/QG E/QE C/QC A/QA QA′ CLR GND VCC S1 SL QH′ H/QH F/QF D/QD B/QB CLK SR SN54ALS299 ...J PACKAGE SN74ALS299 . . . DW OR N PACKAGE (TOP VIEW) 3 2120 19 910 11 12 13 4 5 6 7 8 18 17 16 15 14 SL QH′ H/QH F/QF D/QD G/QG E/QE C/QC A/QA QA′ SN54ALS299 . . . FK PACKAGE (TOP VIEW) 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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