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LTC4307 Datasheet(PDF) 10 Page - Linear Technology |
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LTC4307 Datasheet(HTML) 10 Page - Linear Technology |
10 / 16 page LTC4307 10 4307f Live Insertion and Capacitance Buffering Application Figures 4 and 5 illustrate applications of the LTC4307 that take advantage of the LTC4307’s Hot SwapTM , capacitance buffering and precharge features. If the I/O cards were plugged directly into the backplane without the LTC4307 buffer, all of the backplane and card capacitances would add directly together, making rise-time and fall-time re- quirements difficult to meet. Placing an LTC4307 on the edge of each card, however, isolates the card capacitance from the backplane. For a given I/O card, the LTC4307 drives the capacitance of everything on the card and the backplane must drive only the capacitance of the LTC4307, which is less than 10pF. In most applications the LTC4307 will be used with a staggered connector where VCC and GND will be long pins. SDA and SCL are medium length pins to ensure that the VCC and GND pins make contact first. This will allow the precharge circuitry to be activated on SDA and SCL before they make contact. ENABLE is a short pin that is pulled down when not connected. This is to ensure that the connection between the backplane and the card’s data and clock busses is not is not enabled until the transients associated with live insertion have settled. Figure 4 shows the LTC4307 in an application with a stag- gered connector. The LTC4307 receives its VCC voltage from one of the long “early power” pins. Establishing early power VCC ensures that the 1V precharge voltage is present at SDAIN and SCLIN before they make contact. Figure 4. The LTC4307 in an Application with a Staggered Connector Hot Swap is a trademark of Linear Technology Corporation. C1 0.01 μF I/O PERIPHERAL CARD 1 CARD CONNECTORS BACKPLANE CONNECTOR BACKPLANE R5 10k R4 10k SDAIN SCLIN ENABLE READY SDAOUT SCLOUT VCC GND LTC4307 R3 10k R2 10k R1 10k VCC ENAn SDA SCL ENA1 READY R6 10k CARD1_SDA CARD1_SCL C2 0.01 μF I/O PERIPHERAL CARD N R8 10k R7 10k 4307 F04 SDAIN SCLIN ENABLE READY SDAOUT SCLOUT VCC GND LTC4307 R9 10k CARDn_SDA CARDn_SCL • • • APPLICATIONS INFORMATION |
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