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数据搜索系统，热门电子元器件搜索 |
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PC87373 数据表(PDF) 157 Page - National Semiconductor (TI) |
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PC87373 数据表(HTML) 157 Page - National Semiconductor (TI) |
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157 / 174 page  13.0 Device Characteristics (Continued) 157 www.national.com Revision 1.1 13.3 INTERNAL RESISTORS DC Test Conditions Figure 44. Internal Resistor Test Conditions, TA =0°Cto70°C, VSUP = 3.3V Figure 45. Internal Pull-Down Resistor for Straps, TA =0°Cto70°C, VSUP = 3.3V Notes for Figures 44 and 45: 1. VSUP is VDD3 or VSB3 according to the pin power well. 1. The equivalent resistance of the pull-up resistor is calculated by RPU = (VSUP − VPIN) / IPU. 2. The equivalent resistance of the pull-down resistor is calculated by RPD = VPIN / IPD. 13.3.1 Pull-Up Resistor Symbol: PUnn 13.3.2 Pull-Down Resistor Symbol: PDnn Symbol Parameter Conditions1 1. TA = 0 °C to 70°C, V SUP = 3.3V. Min2 2. Not tested. Guaranteed by characterization. Typical Max2 Unit RPU Pull-up equivalent resistance VPIN =0V nn − 30% nn nn + 30% K Ω VPIN = 0.8 VSUP 3 nn − 38% K Ω VPIN = 0.17 VSUP 3 3. For strap pins only. nn − 35% K Ω Symbol Parameter Conditions1 1. TA = 0 °C to 70°C, V SUP = 3.3V. Min2 2. Not tested. Guaranteed by characterization. Typical Max2 Unit RPD Pull-down equivalent resistance VPIN =VSUP nn − 30% nn nn + 30% K Ω Device Under Test RPU Pull-Up Resistor Test Circuit Pull-Down Resistor Test Circuit VSUP Pin A IPU V VPIN Device Under Test RPD VSUP Pin A IPD V VPIN VSUP Device Under Test RPU VSUP Pin A IPU V VPIN VSUP Device Under Test RPU VSUP Pin A IPU V VPIN 10 µA VPIN < VIL VPIN > VIH 10 µA 10 K Ω |
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