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SN74V273-7GGM 데이터시트(PDF) 3 Page - Texas Instruments |
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SN74V273-7GGM 데이터시트(HTML) 3 Page - Texas Instruments |
3 / 52 page SN74V263, SN74V273, SN74V283, SN74V293 8192 × 18, 16384 × 18, 32768 × 18, 65536 × 18 3.3-V CMOS FIRST-IN, FIRST-OUT MEMORIES SCAS669D – JUNE 2001 – REVISED FEBRUARY 2003 3 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 B C D E F G H J K 123 4567 8 9 10 VCC VCC VCC NC VCC VCC VCC VCC VCC VCC NC WCLK PRS LD GND BE PFM RCLK RT SEN WEN MRS FF/IR FSEL0 FSEL1 PAE RM REN OE DNC DNC VCC FWFT/ SI OW HF IP EF/OR Q17 GND GND GND GND GND IW D17 PAF NC Q16 D16 D15 GND GND Q15 Q14 D14 D13 GND VCC Q13 Q12 NC D12 D11 VCC Q2 GND GND GND Q11 D10 D9 D5 D1 Q0 GND VCC Q9 Q10 D8 D7 GND GND D3 Q1 Q3 Q5 Q7 Q8 D6 D4 D2 D0 GND GND Q4 Q6 DNC = Do not connect GGM PACKAGE (TOP VIEW) A NC NC NC NC description (continued) The frequencies of both the RCLK and the WCLK signals can vary from 0 to fMAX, with complete independence. There are no restrictions on the frequency of one clock input with respect to the other. There are two possible timing modes of operation with these devices: first-word fall-through (FWFT) mode and standard mode. In FWFT mode, the first word written to an empty FIFO is clocked directly to the data output lines after three transitions of the RCLK signal. REN need not be asserted for accessing the first word. However, subsequent words written to the FIFO do require a low on REN for access. The state of the FWFT/SI input during master reset determines the timing mode in use. In standard mode, the first word written to an empty FIFO does not appear on the data output lines unless a specific read operation is performed. A read operation, which consists of activating REN and enabling a rising RCLK edge, shifts the word from internal memory to the data output lines. |
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