LTC4301 Linear Technology, LTC4301 Datasheet - Page 7

• Manufacturer Part Number: LTC4301
• Description: Supply Independent Hot Swappable 2-Wire Bus Buffer
• Manufacturer: Linear Technology

APPLICATIO S I FOR ATIO
Live Insertion and Capacitance Buffering Application
Figures 3 illustrates applications of the LTC4301 with
different bus pull-up and V
ability to recognize and buffer bus data levels that are
above or below its V
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
3.3V
SDA
SDA
SDA
SCL
SCL
SCL
5V
5V
10k
10k
10k
U
CC
3.3V
3.3V
10k
10k
10k
5V
supply. All of these applications
U
CC
voltages, demonstrating its
CONNECTOR
CONNECTOR
CONNECTOR
BACKPLANE
BACKPLANE
BACKPLANE
W
Figure 3. Typical Supply Independent Applications
TM
controlling,
U
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
staggered connector where V
SDA and SCL are medium length pins to ensure that the
V
precharge circuitry to be activated on SDA and SCL before
Hot Swap is a trademark of Linear Technology Corporation.
10k
10k
10k
CC
CS
SDAIN
SCLIN
CS
SDAIN
SCLIN
CS
SDAIN
SCLIN
and GND pins make contact first. This will allow the
0.01µF
0.01µF
0.01µF
LTC4301
LTC4301
LTC4301
CARD
CARD
CARD
GND
GND
GND
V
V
V
CC
CC
CC
SDAOUT
SDAOUT
SDAOUT
SCLOUT
SCLOUT
SCLOUT
READY
READY
READY
4301 F03
CC
10k
10k
10k
and GND will be long pins.
www.DataSheet4U.com
2.5V
10k
10k
10k
CARD_SDA
CARD_SCL
CARD_SDA
CARD_SCL
CARD_SDA
CARD_SCL
LTC4301
4301fb
7