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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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ST40RA 数据表(PDF) 55 Page - STMicroelectronics |
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ST40RA 数据表(HTML) 55 Page - STMicroelectronics |
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55 / 94 page  7 Electrical specifications ST40RA 55/94 STMicroelectronics ADCS 7260755H 7.8 PIO AC specifications Reference clock in this case means the last transition of any PIO output signal within a bus, and hence is a virtual clock. Symbol Parameter PIO13:0 PIO23:14 Units Note Min Max Min Max tPCHPOV PIO reference clock high to PIO output valid -5.5 1 -5.5 1 ns a a. No skew guarantee is made between the two separate PIO buses: PIO13:0 and PIO23:14 tPCHWDZ PIO tri-state after PIO reference clock high -5 5 -5 5 ns 1 tPIOr Output rise time 1515 ns tPIOf Output fall time 1515 ns tPIOr Input rise time 20 5 ns b b. Loose input rise and fall times on PIO13:0 bus as these are schmitt trigger inputs. tPIOf Input fall time 20 5 ns 2 Table 29: PIO timings Figure 15: PIO AC timings PIO reference clock PIOOUT tPCHPOV PIOOUT tPCHWDZ |
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