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SN74ACT7807PAG Scheda tecnica(PDF) 11 Page - Texas Instruments |
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SN74ACT7807PAG Scheda tecnica(HTML) 11 Page - Texas Instruments |
11 / 15 page SN74ACT7807 2048 × 9 CLOCKED FIRST-IN, FIRST-OUT MEMORY SCAS200D – JANUARY 1991 – REVISED APRIL 1998 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 timing requirements over recommended operating free-air temperature range (unless otherwise noted) (see Figures 1 through 5) ’ACT7807-15 ’ACT7807-20 ’ACT7807-25 ’ACT7807-40 UNIT MIN MAX MIN MAX MIN MAX MIN MAX UNIT fclock Clock frequency 67 50 40 25 MHz WRTCLK high or low 6 8 9 13 tw Pulse duration RDCLK high or low 6 8 9 13 ns PEN low 6 9 9 13 D0–D8 before WRTCLK ↑ 4 5 5 5 WRTEN1, WRTEN2 before WRTCLK ↑ 4 5 5 5 tsu Setup time OE, RDEN1, RDEN2 before RDCLK ↑ 5 6 6 6.5 ns Reset: RESET low before first WRTCLK ↑ and RDCLK↑† 7 8 8 8 PEN before WRTCLK ↑ 4 5 5 5 D0–D8 after WRTCLK ↑ 0 0 0 0 WRTEN1, WRTEN2 after WRTCLK ↑ 0 0 0 0 th Hold time OE, RDEN1, RDEN2 after RDCLK ↑ 0 0 0 0 ns h Reset: RESET low after fourth WRTCLK ↑ and RDCLK↑† 5 5 5 5 PEN high after WRTCLK ↓ 0 0 0 0 PEN low after WRTCLK ↑ 3 3 3 3 † 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 ’ACT7807-15 ’ACT7807-20 ’ACT7807-25 ’ACT7807-40 UNIT PARAMETER (INPUT) (OUTPUT) MIN TYP‡ MAX MIN MAX MIN MAX MIN MAX UNIT fmax WRTCLK or RDCLK 67 50 40 25 MHz tpd RDCLK ↑ Any Q 3 9 12 3 13 3 18 3 25 ns tpd§ RDCLK ↑ Any Q 8 ns WRTCLK ↑ IR 1 9 1 12 1 14 1 16 t d RDCLK ↑ OR 1 9 2 12 2 14 2 16 ns tpd WRTCLK ↑ AF/AE 2 16 2 20 2 25 2 30 ns RDCLK ↑ AF/AE 2 17 2 20 2 25 2 30 tPLH WRTCLK ↑ HF 2 19 2 21 2 23 2 25 ns tPHL RDCLK ↑ HF 2 16 2 18 2 20 2 22 ns tPLH RESET low AF/AE 1 12 1 18 1 22 1 24 ns tPHL RESET low HF 2 12 2 18 2 22 2 24 ns ten OE Any Q 2 10 2 13 2 15 2 18 ns tdis OE Any Q 1 11 1 13 1 15 1 18 ns ‡ All typical values are at VCC = 5 V, TA = 25°C. § This parameter is measured with CL = 30 pF (see Figure 6). |
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