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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC4240IGN датащи(PDF) 22 Page - Linear Technology |
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LTC4240IGN датащи(HTML) 22 Page - Linear Technology |
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22 / 28 page  LTC4240 22 4240f Table 6. R1 and R2 Resistor Values vs Precharge Voltages VPRECHARGE R11A R11B VPRECHARGE R11A R11B 1.5V 18 Ω 9.09 Ω 0.9V 16.2 Ω 1.78 Ω 1.4V 18 Ω 7.15 Ω 0.8V 14.7 Ω 3.65 Ω 1.3V 18 Ω 5.36 Ω 0.7V 12.1 Ω 5.11 Ω 1.2V 18 Ω 3.65 Ω 0.6V 11 Ω 7.15 Ω 1.1V 18 Ω 1.78 Ω 0.5V 9.09 Ω 9.09 Ω 1V 18 Ω 0 Ω Figure 12. Precharge Voltage Greater Than 1V Figure 11. Precharge Voltage Less Than 1V 3VIN 5VIN 3VIN 5VIN 22 21 LTC4240* 4240 F10 RI01 10 Ω, 5% I/O I/O RI0128 10 Ω, 5% PCI BRIDGE (21154) UP TO 128 I/O LINES DATA BUS 3VIN GND PRECHARGE 18 DRIVE 17 10 RPRE1 10k 5% PRECHARGE OUT 1V ±20% IOUT = ±55mA R11 18 Ω, 5% RPRE128 10k 5% R8 1k, 5% R7 12 Ω, 5% C3 4.7nF R9 24 Ω, 5% CompactPCI BACKPLANE CONNECTOR (FEMALE) CompactPCI BACKPLANE CONNECTOR (MALE) MEDIUM 5V LONG 5V 3.3V LONG 3.3V GROUND I/O PIN 1 I/O PIN 128 R22 2.74 Ω R21 1.74 Ω *ADDITIONAL DETAILS OMITTED FOR CLARITY Q3 MMBT2222A Q3 MMBT2222A C3 4.7nF R7 12 Ω, 5% R9 24 Ω, 5% R8 1k, 5% 3VIN PRECHARGE OUT GND PRECHARGE DRIVE LTC4240* 10 18 17 R11A R11B VPRECHARGE = • 1V R11A R11A + R11B 4240 F11 *ADDITIONAL DETAILS OMITTED FOR CLARITY Q3 MMBT2222A C3 4.7nF R7 12 Ω, 5% R9 24 Ω, 5% R8 1k, 5% 3VIN PRECHARGE OUT GND PRECHARGE DRIVE LTC4240* 10 18 17 R11A R11B VPRECHARGE = • 1V R11A + R11B R11A 4240 F12 *ADDITIONAL DETAILS OMITTED FOR CLARITY Figure 10. Precharge Application Circuit Precharge resistors are used to connect the 1V bias voltage to the CompactPCI connector I/O lines. This allows live insertion of the I/O lines with minimal disturbance. Figure 13 shows the precharge application circuit for 5V signaling environments. The precharge resistor require- ments are more stringent for 3.3V and Universal Hot Swap signaling. If the total leakage current on the I/O line is less APPLICATIO S I FOR ATIO |
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