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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PC87366 датащи(PDF) 233 Page - National Semiconductor (TI) |
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PC87366 датащи(HTML) 233 Page - National Semiconductor (TI) |
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233 / 240 page  14.0 Device Characteristics (Continued) 233 www.national.com 14.5.3 LCLK and LRESET Symbol Parameter Min Max Units tCYC Note 1. Note 1. The PCI may have any clock frequency between nominal DC and 33 MHz. Device operational parameters at frequencies under 16 MHz may be guaranteed by design rather than by testing. The clock frequency may be changed at any time during the operation of the system as long as the clock edges remain “clean” (monotonic) and the minimum cycle and high and low times are not violated. The clock may only be stopped in a low state. LCLK Cycle Time 30 ns tHIGH LCLK High Time 11 ns tLOW LCLK Low Time 11 ns - LCLK Slew RateNote 2. Note 2. Rise and fall times are specified in terms of the edge rate measured in V/ns. This slew rate must be met across the minimum peak-to- peak portion of the clock wavering as shown below. 1 4 V/ns - LRESET Slew RateNote 3. Note 3. The minimum LRESET slew rate applies only to the rising (de- assertion) edge of the reset signal, and ensures that system noise cannot render an otherwise a monotonic signal to appear to bounce in the switching range. 50 mV/ns 0.6 VDD 0.2 VDD 0.5 VDD 0.4 VDD 0.3 VDD 0.4 VDD p-to-p (minimum) tHIGH tLOW 3.3 V Clock tCYC |
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