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SN74ALS299DW Datasheet(PDF) 2 Page - Texas Instruments |
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SN74ALS299DW Datasheet(HTML) 2 Page - Texas Instruments |
2 / 17 page SN54ALS299, SN74ALS299 8-BIT UNIVERSAL SHIFT/STORAGE REGISTERS WITH 3-STATE OUTPUTS SDAS220B – DECEMBER 1982 – REVISED DECEMBER 1994 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 FUNCTION TABLE MODE INPUTS I/O PORTS OUTPUTS MODE CLR S1 S0 OE1† OE2† CLK SL SR A/QA B/QB C/QC D/QD E/QE F/QF G/QG H/QH QA ′ QH ′ Clear L L L X L H L X H L L X L L X X X X X X X X X X L L X L L X L L X L L X L L X L L X L L X L L X L L L L L L Hold H H L X L X L L L L X L X X X X QA0 QA0 QB0 QB0 QC0 QC0 QD0 QD0 QE0 QE0 QF0 QF0 QG0 QG0 QH0 QH0 QA0 QA0 QH0 QH0 Shift Right H H L L H H L L L L ↑ ↑ X X H L H L QAn QAn QBn QBn QCn QCn QDn QDn QEn QEn QFn QFn QGn QGn H L QGn QGn Shift Left H H H H L L L L L L ↑ ↑ H L X X QBn QBn QCn QCn QDn QDn QEn QEn QFn QFn QGn QGn QHn QHn H L QBn QBn H L Load H H H X X ↑ X X a b c d e f g h a h NOTE: a ...h = the level of the steady-state input at inputs A through H, respectively. This data is loaded into the flip-flops while the flip-flop outputs are isolated from the I/O terminals. † When one or both output-enable inputs are high, the eight I/O terminals are disabled to the high-impedance state; however, sequential operation or clearing of the register is not affected. logic symbol‡ SRG8 M 0 3 R 9 6 14 5 15 4 8 2 3 0 1 S0 1 19 S1 12 CLK 5, 13 1,4D 11 SR 3,4D 7 6, 13 3,4D 13 17 12, 13 2,4D 18 SL 3,4D 16 & 3EN13 C4/1 →/2← QA ′ QH ′ CLR OE1 OE2 A/QA H/QH B/QB C/QC D/QD E/QE F/QF G/QG Z5 Z6 Z12 ‡ This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. |
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