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SN74ACT7881 Folha de dados(PDF) 11 Page - Texas Instruments |
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SN74ACT7881 Folha de dados(HTML) 11 Page - Texas Instruments |
11 / 15 page SN74ACT7881 1024 × 18 CLOCKED FIRST-IN, FIRST-OUT MEMORY SCAS227E – FEBRUARY 1993 – REVISED APRIL 1998 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 timing requirements over recommended ranges of supply voltage and operating free-air temperature (see Figures 1 through 5) ’ACT7881-15 ’ACT7881-20 ’ACT7881-30 UNIT MIN MAX MIN MAX MIN MAX UNIT fclock Clock frequency 67 50 33.4 MHz WRTCLK high 5 7 8.5 WRTCLK low 7 7 11 tw Pulse duration RDCLK high 5 7 8.5 ns RDCLK low 7 7 11 DAF high 7 7 10 D0–D17 before WRTCLK ↑ 5 5 5 WRTEN1, WRTEN2 high before WRTCLK ↑ 4 5 5 OE, RDEN1, RDEN2 high before RDCLK ↑ 4 5 5 tsu Setup time Reset: RESET low before first WRTCLK ↑ and RDCLK ↑† 5 6 7 ns Define AF/AE: D0–D8 before DAF ↓ 3 5 5 Define AF/AE: DAF ↓ before RESET↑ 3 6 7 Define AF/AE (default): DAF high before RESET ↑ 4 5 5 D0–D17 after WRTCLK ↑ 0 0 0 WRTEN1, WRTEN2 high after WRTCLK ↑ 0 0 0 OE, RDEN1, RDEN2 high after RDCLK ↑ 0 0 0 th Hold time Reset: RESET low after fourth WRTCLK ↑ and RDCLK ↑† 0 0 0 ns Define AF/AE: D0–D8 after DAF ↓ 0 0 0 Define AF/AE: DAF low after RESET ↑ 0 0 0 Define AF/AE (default): DAF high after RESET ↑ 0 0 0 † To permit the clock pulse to be utilized for reset purposes switching characteristics over recommended ranges of supply voltage and operating free-air temperature, CL = 50 pF (unless otherwise noted) (see Figure 5) PARAMETER FROM TO ’ACT7881-15 ’ACT7881-20 ’ACT7881-30 UNIT PARAMETER (INPUT) (OUTPUT) MIN MAX MIN MAX MIN MAX UNIT fmax WRTCLK or RDCLK 67 50 33.4 MHz tpd RDCLK ↑ Any Q 3 12 3 13 3 18 ns tpd‡ RDCLK ↑ Any Q ns WRTCLK ↑ IR 2 8 2 9.5 2 12 t d RDCLK ↑ OR 2 8 2 9.5 2 12 ns tpd WRTCLK ↑ AF/AE 6 17 6 19 6 22 ns RDCLK ↑ AF/AE 6 17 6 19 6 22 tPLH WRTCLK ↑ HF 6 14 6 17 6 21 ns tPHL RDCLK ↑ HF 6 14 6 17 6 21 ns tPLH RESET ↓ AF/AE 3 12 3 17 3 21 ns tPHL RESET ↓ HF 3 14 3 19 3 23 ns ten OE Any Q 2 9 2 11 2 11 ns tdis OE Any Q 2 10 2 14 2 14 ns ‡ This parameter is measured with CL = 30 pF (see Figure 6). |
Nº de peça semelhante - SN74ACT7881 |
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Descrição semelhante - SN74ACT7881 |
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