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74HC7731 数据表(PDF) 8 Page - NXP Semiconductors |
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74HC7731 数据表(HTML) 8 Page - NXP Semiconductors |
8 / 8 page September 1993 8 Philips Semiconductors Product specification Quad 64-bit static shift register 74HC/HCT7731 Fig.6 CPD as a function of the duty factor. handbook, halfpage CPD (pF) 0 0.2 0.4 0.6 duty factor 60 40 20 0 MLA166 POWER DISSIPATION INFORMATION The power dissipation per register operating at the same frequency is given by: PD = (CPD x VCC2 x fi) + (CL + VCC2 x fo) + (Ipull-up x VCC) As PD also depends on the frequency at which the contents of the internal bits are changing, the value of CPD is a function of the duty factor (df) being the ration between data and clock frequency, see Fig.6. Example: As the maximum allowable power dissipation in an SO package at Tamb = 125 °C is 60 mW, it is allowed to apply 4 registers at the same time under these conditions. PACKAGE OUTLINES See “74HC/HCT/HCU/HCMOS Logic Package Outlines”. fi = clock input frequency fo = data output frequency CL = output load capacitance in pF VCC = power supply voltage in V. fi = 12 MHz fo = 3 MHz CL = 25 pF VCC =5 V df = 3/12 = 0.25 CPD = 42.5 pF PD = (42.5 × 52 × 12) + (25 × 52 × 3) = 14625 µW |
类似零件编号 - 74HC7731 |
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类似说明 - 74HC7731 |
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