LTC4301 UUWUAPPLICATIO S I FOR ATIOLive Insertion and Capacitance Buffering Application on the edge of each card, however, isolates the card capacitance from the backplane. For a given I/O card, the Figures 3 illustrates applications of the LTC4301 with LTC4301 drives the capacitance of everything on the card different bus pull-up and VCC voltages, demonstrating its and the backplane must drive only the capacitance of the ability to recognize and buffer bus data levels that are LTC4301, which is less than 10pF. above or below its VCC supply. All of these applications take advantage of the LTC4301’s Hot SwapTM controlling, In most applications the LTC4301 will be used with a capacitance buffering and precharge features. If the I/O staggered connector where VCC and GND will be long pins. cards were plugged directly into the backplane without the SDA and SCL are medium length pins to ensure that the LTC4301 buffer, all of the backplane and card capaci- VCC and GND pins make contact first. This will allow the tances would add directly together, making rise- and fall- precharge circuitry to be activated on SDA and SCL before time requirements difficult to meet. Placing an LTC4301 Hot Swap is a trademark of Linear Technology Corporation. 5V 0.01µF 10k 10k 3.3V 10k 10k 10k CS VCC SDAOUT CARD_SDA SDA SDAIN LTC4301 SCLOUT CARD_SCL AGGERED CONNECTOR SCL SCLIN READY ST GND BACKPLANE CONNECTOR CARD 3.3V 0.01µF 10k 10k 5V 10k 10k 10k CS VCC SDAOUT CARD_SDA SDA SDAIN LTC4301 SCLOUT CARD_SCL AGGERED CONNECTOR SCL SCLIN READY ST GND BACKPLANE CONNECTOR CARD 2.5V 3.3V 0.01µF 10k 10k 5V 10k 10k 10k CS VCC SDAOUT CARD_SDA SDA SDAIN LTC4301 SCLOUT CARD_SCL AGGERED CONNECTOR SCL SCLIN READY ST GND 4301 F03 BACKPLANE CARD CONNECTOR Figure 3. Typical Supply Independent Applications 4301fb 7
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