7

LTC4301

4301fb

Live Insertion and Capacitance Buffering Application

Figures 3 illustrates applications of the LTC4301 with

ability to recognize and buffer bus data levels that are

take advantage of the LTC4301’s Hot Swap

capacitance buffering and precharge features. If the I/O

cards were plugged directly into the backplane without the

LTC4301 buffer, all of the backplane and card capaci-

tances would add directly together, making rise- and fall-

time requirements difficult to meet. Placing an LTC4301

APPLICATIO S I FOR ATIO

on the edge of each card, however, isolates the card

capacitance from the backplane. For a given I/O card, the

LTC4301 drives the capacitance of everything on the card

and the backplane must drive only the capacitance of the

LTC4301, which is less than 10pF.

In most applications the LTC4301 will be used with a

SDA and SCL are medium length pins to ensure that the

precharge circuitry to be activated on SDA and SCL before

CS

SDAIN

SCLIN

GND

SDAOUT

SCLOUT

READY

10k

10k

LTC4301

CARD_SCL

CARD_SDA

0.01

µF

10k

10k

10k

BACKPLANE

CONNECTOR

5V

3.3V

SDA

SCL

CS

SDAIN

SCLIN

GND

SDAOUT

SCLOUT

READY

10k

10k

LTC4301

CARD_SCL

CARD_SDA

0.01

µF

10k

10k

10k

BACKPLANE

CONNECTOR

3.3V

5V

SDA

SCL

CS

SDAIN

SCLIN

GND

SDAOUT

SCLOUT

READY

4301 F03

10k

2.5V

10k

LTC4301

CARD_SCL

CARD_SDA

0.01

µF

10k

10k

10k

BACKPLANE

CONNECTOR

CARD

CARD

CARD

3.3V

5V

SDA

SCL

Figure 3. Typical Supply Independent Applications

Hot Swap is a trademark of Linear Technology Corporation.