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7733 Datasheet(PDF) 424 Page - Renesas Technology Corp |
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7733 Datasheet(HTML) 424 Page - Renesas Technology Corp |
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424 / 940 page  APPLICATIONS 7733 Group User’s Manual 17–17 Fig. 17.1.11 Bus buffer usage example (2) (when a memory which requires a long data hold time for writing is connected) 17.1 Memory expansion g1 Make sure that the propagation delay time is 40.5 ns or less. g2 Make sure that the output enable time is 5 ns or more and the output disable time is 42.5 ns or less. Circuit conditions: Wait 1 is valid, 1 = 2 , f(XIN) 8 , f(XIN) 16 , f(XIN) 2 f(XCIN) or ALS245A BYTE E 16 MHz Data bus (even) Data bus (odd) LE DQ OE AC573 OC DIR AB LE DQ OE AC573 ALE A1 to A7 Address bus DIR AB A0 R/W BHE AC32 AC04 RD WE WO 1D1Q 1T 2D 2Q 2T 1 AC74 AC32 AC04 XIN XOUT ALS245A A8/D8 to A15/D15 M37733MHBXXXFP A16/D0 to A23/D7 g1 g2 CNVSS g2 OC 1 These circuits make the rising edge of the write signal earlier by 1/2 1 , so that the write hold time is extended. |
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