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HCF4076BC1 bảng dữ liệu(PDF) 7 Page - STMicroelectronics |
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7 / 13 page DYNAMIC ELECTRICAL CHARACTERISTICS (continued) Symbol Parameter Test Conditions Value Unit VDD (V) Min. Typ. Max. tR Inhibit Input Removal Time 5 240 120 ns 10 130 65 15 110 55 tR Set Remova Time 5 150 75 ns 10 80 40 15 50 25 tR Clear Removal Time 5 60 30 ns 10 40 20 15 30 15 APPLICATION NOTE For fractional multipliers with more than one digit, HCC/HCF4527B devices may be cascated in two different modes: the Add mode and the Mltiply mode (see figures 1 and 2). When two units are cascated in Add mode and pro- grammed to 9 and 4 respectively, the more signifi- cant unit will have 9 output pulses for every 10 input pulses and the other unit will have 4 output pulses for every 100 input pulses for a total of: 9 10 + 4 100 = 94 100 In the multiply mode, the fraction programmed into the first rate multiplier is multiplied by the fraction programmed into the second one: If N1 = 9 and N2 =4 fout2 = 4 10 fout1 fout1 = 9 10 fclock fout2 = 4 10 × 9 10 fclock = 36 100 fclock Therefore 36 output pulses for every 100 clock input pulses. HCC/HCF4527B 7/13 |
Số phần tương tự - HCF4076BC1 |
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Mô tả tương tự - HCF4076BC1 |
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