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LS7266R1 Datasheet(PDF) 6 Page - LSI Computer Systems |
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LS7266R1 Datasheet(HTML) 6 Page - LSI Computer Systems |
6 / 14 page 7266R1-011498-6 Transient Characteristics. (TA = -25˚C to +80˚C, VDD = 4.5V to 5.5V) Parameter Symbol Min. Value Max.Value Unit Remarks Read Cycle (See Fig. 1) RD Pulse Width tr1 50 - ns - CS Set-up Time tr2 50 - ns - CS Hold Time tr3 0 - ns - C/D Set-up Time tr4 50 - ns - C/D Hold Time tr5 10 - ns - X/Y Set-up Time tr6 50 - ns - X/Y Hold Time tr7 10 - ns - Data Bus Access Time tr8 50 - ns Access starts when both RD and CS are low. Data Bus Release Time tr9 - 25 ns Release starts when either RD or CS is terminated. Back to Back Read delay tr10 60 - ns - Write Cycle (See Fig. 2) WR Pulse Width tW1 30 - ns - CS Set-up Time tW2 30 - ns - CS Hold Time tW3 0 - ns - C/D Set-up Time tW4 30 - ns - C/D Hold Time tW5 10 - ns - X/Y Set-up Time tW6 30 - ns - X/Y Hold Time tW7 10 - ns - Data Bus Set-up Time tW8 30 - ns - Data Bus Hold Time tW9 10 - ns - Back to Back Write Delay tW10 60 - ns - Quadrature Mode (See Fig. 3-5) FCK High Pulse Width t1 14 - ns - FCK Low Pulse Width t2 14 - ns - FCK Frequency fFCK - 35 MHz - Mod-n Filter Clock(FCKn)Period t3 28 - ns t3 = (n+1) (t1+t2), where n = PSC = 0 to FFH FCKn frequency fFCKn - 35 MHz - Quadrature Separation t4 57 - ns t4 ≥ 2t3 Quadrature Clock Pulse Width t5 115 - ns t5 ≥ 4t3 Quadrature Clock frequency fQA, fQB - 4.3 MHz fQA = fQB = 1/8t3 Quadrature Clock to Count Delay tQ1 5t3 6t3 - - X1/X2/X4 Count Clock Pulse Width tQ2 28 - ns tQ2 = t3 Index Input Pulse Width tidx 85 - ns tidx ≥ 3t3 Index Skew from A tAi - 28 ns tAi ≤ t3 Carry/Borrow/Compare Output Width tQ3 28 - ns tQ3 = t3 Non-Quadrature Mode (See Fig. 6-7) Clock A - High Pulse Width t6 16 - ns - Clock A - Low Pulse Width t7 16 - ns - Direction Input B Set-up Time t8S 20 - ns - Direction Input B Hold Time t8H 20 - ns - Gate Input (ABG) Set-up Time tGS 20 - ns - Gate Input (ABG) Hold Time tGH 20 - ns - Clock Frequency (non-Mod-N) fA - 30 MHz fA = (1/ (t6 + t7) ) Clock Frequency (Mod-N) fAN - 25 MHz - Clock to Carry or Borrow Out Delay t9 - 30 ns - Carry or Borrow Out Pulse Width t10 16 - ns t10 = t7 Load CNTR, Reset CNTR and Load OL Pulse Width t11 20 - ns - Clock to Compare Out Delay t12 50 - ns - |
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