LTC4300A-1CMS8 Linear Technology, LTC4300A-1CMS8 Datasheet - Page 11

• Manufacturer Part Number: LTC4300A-1CMS8
• Description: IC BUFFER BUS 2WR HOTSWAP 8-MSOP
• Manufacturer: Linear Technology
• Type: Hot-Swap Switchr

Specifications of LTC4300A-1CMS8

• Applications: General Purpose, Buffer/Bus Extender
• Internal Switch(s): Yes
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

APPLICATIO S I FOR ATIO
these applications, note that if the I/O cards were plugged
directly into the backplane, all of the backplane and card
capacitances would add directly together, making rise- and
fall-time requirements difficult to meet. Placing a
LTC4300A on the edge of each card, however, isolates the
card capacitance from the backplane. For a given I/O card,
the LTC4300A drives the capacitance of everything on the
card and the backplane must drive only the capacitance of
the LTC4300A, which is less than 10pF.
Figure 3 shows the LTC4300A-1 in a CompactPCI
figuration. Connect V
of the CompactPCI power supply Hot Swap circuits. Use
a pull-up resistor to ENABLE for a card side enable/disable.
BD_SEL
V
SDA
SCL
V
CC2
CC
10k
R1
BACKPLANE
10k
R2
Figure 4. Inserting Multiple I/O Cards into a Live Backplane Using the LTC4300A-2 in a CompactPCI System
U
CC
and ENABLE to the output of one
CONNECTOR
BACKPLANE
U
W
U
TM
con-
C2 0.01 F
C4 0.01 F
C6 0.01 F
POWER SUPPLY
POWER SUPPLY
POWER SUPPLY
5.1
5.1
5.1
HOT SWAP
HOT SWAP
HOT SWAP
V
voltage powering up after all other pins have established
connection, the UVLO circuit ensures that the backplane
and card data and clock busses are not connected until the
transients associated with live insertion have settled. Owing
to their small capacitance, the SDAIN and SCLIN pins cause
minimal disturbance on the backplane busses when they
make contact with the connector.
Figure 4 shows the LTC4300A-2 in a CompactPCI configu-
ration. The LTC4300A-2 receives its V
of the long “early power” pins. Because this power is not
switched, add a 5 to 10 resistor between the V
CompactPCI is a trademark of the PCI Industrial Computer Manufacturers Group.
CC
is monitored by a filtered UVLO circuit. With the V
LTC4300A-1/LTC4300A-2
V
SDAIN
SCLIN
V
SDAIN
SCLIN
V
SDAIN
SCLIN
CC
CC
CC
I/O PERIPHERAL CARD 1
I/O PERIPHERAL CARD 2
I/O PERIPHERAL CARD N
LTC4300A-2
LTC4300A-2
LTC4300A-2
V
GND
V
GND
V
GND
U1
U2
U3
CC2
CC2
CC2
C1
0.01 F
C3
0.01 F
C5
0.01 F
SDAOUT
SDAOUT
SDAOUT
SCLOUT
SCLOUT
SCLOUT
ACC
ACC
ACC
R4
10k
R8
10k
R12
10k
CC
voltage from one
R5
10k
R9
10k
R13
10k
sn4300a12 4300a12fs
R6
10k
R10
10k
R14
10k
4300A-1/2 F04
CARD_SDA
CARD_SCL
CARD2_SDA
CARD2_SCL
CARDN_SDA
CARDN_SCL
11
CC
pins
CC