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SN74ACT7804-20DLR Fiches technique(PDF) 2 Page - Texas Instruments |
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SN74ACT7804-20DLR Fiches technique(HTML) 2 Page - Texas Instruments |
2 / 13 page SN74ACT7804 512 × 18 STROBED FIRST-IN, FIRST-OUT MEMORY SCAS204C – APRIL 1992 – REVISED APRIL 1998 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description (continued) A low level on the reset (RESET) input 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 upon power up. The first word loaded into empty memory causes EMPTY to go high and the data to appear on the Q outputs. It is important to note that the first word does not have to be unloaded. The data outputs are noninverting with respect to the data inputs and are in the high-impedance state when the output-enable (OE) input is high. The SN74ACT7804 is characterized for operation from 0 °C to 70°C. logic symbol† 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 Φ FIFO 512 × 18 SN74ACT7804 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 FULL EMPTY † This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. |
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