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ST10F269ZX датащи(PDF) 168 Page - STMicroelectronics |
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ST10F269ZX датащи(HTML) 168 Page - STMicroelectronics |
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168 / 184 page ![]() ST10F269 168/184 21.4.12 - CLKOUT and READY VDD = 5V ± 10%, VSS = 0V, TA = -40 to + 125°C, CL = 50pF, PQFP144 devices Notes: 1. These timings are given for test purposes only, in order to assure recognition at a specific clock edge. 2. Demultiplexed bus is the worst case. For multiplexed bus 2TCL are to be added to the maximum values. This adds even more time for deactivating READY. The 2tA and tC refer to the next following bus cycle, tF refers to the current bus cycle. Table 50 : CLKOUT and READY Characteristics (PQFP144 devices) Symbol Parameter Maximum CPU Clock = 40 MHz Variable CPU Clock 1/2TCL = 1 to 40 MHz Minimum Maximum Minimum Maximum t29 CC CLKOUT cycle time 25 25 2TCL 2TCL ns t30 CC CLKOUT high time 4 – TCL – 8.5 – ns t31 CC CLKOUT low time 3 – TCL – 9.5 – ns t32 CC CLKOUT rise time – 4 – 4 ns t33 CC CLKOUT fall time – 4 – 4 ns t34 CC CLKOUT rising edge to ALE falling edge -2 + tA 8 + tA -2 + tA 8 + tA ns t35 SR Synchronous READY setup time to CLKOUT 12.5 – 12.5 – ns t36 SR Synchronous READY hold time after CLKOUT 2– 2 – ns t37 SR Asynchronous READY low time 35 – 2TCL + 10 – ns t58 SR Asynchronous READY setup time 1) 12.5 – 12.5 – ns t59 SR Asynchronous READY hold time 1) 2– 2 – ns t60 SR Async. READY hold time after RD, WR high (Demultiplexed Bus) 2) 0 0 + 2tA + tC + tF 2) 0 TCL - 12.5 + 2tA + tC + tF 2) ns |
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