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SN74ALVC7806-25DL Arkusz danych(PDF) 2 Page - Texas Instruments |
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SN74ALVC7806-25DL Arkusz danych(HTML) 2 Page - Texas Instruments |
2 / 10 page SN74ALVC7806 256 × 18 LOW-POWER FIRST-IN, FIRST-OUT MEMORY SCAS591A – OCTOBER 1997 – REVISED APRIL 1998 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description (continued) A low level on the reset (RESET) resets the internal stack pointers and sets FULL high, AF/AE high, HF low, and EMPTY low. The Q outputs are not reset to any specific logic level. The FIFO must be reset on power up. The first word loaded into empty memory causes EMPTY to go high and the data to appear on the Q outputs. The data outputs are in the high-impedance state when the output-enable (OE) is high. The SN74ALVC7806 is characterized for operation from 0 °C to 70°C. logic symbol† EMPTY FULL FIFO 256 × 18 Φ 0 21 D0 20 D1 19 D2 18 D3 17 D4 16 D5 15 D6 14 D7 12 D8 Q0 33 0 Q1 34 Q2 36 Q3 37 Q4 38 28 Full HF 22 Half-Full AF/AE 24 Almost Full/Empty 29 Empty Q5 40 Q6 41 Q7 42 Q8 43 Data 1 11 D9 9 D10 8 D11 7 D12 6 D13 5 D14 4 D15 3 D16 17 2 D17 Q9 45 Q10 46 Q11 47 Q12 48 Q13 49 Q14 51 Q15 53 Q16 54 Q17 55 17 RESET OE PEN RESET 1 25 LDCK LDCK Data Program Enable 23 EN1 56 32 UNCK UNCK † This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. |
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