LTC4300A-1CMS8 Linear Technology, LTC4300A-1CMS8 Datasheet - Page 12

• 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
LTC4300A-1/LTC4300A-2
of the connector and the LTC4300A-2, as shown in the
figure. In addition, make sure that the V
the backplane is large compared to the 0.01 F bypass
capacitor on the card. Establishing early power V
sures that the 1V precharge voltage is present at the
SDAIN and SCLIN pins before they make contact. Connect
V
Hot Swap circuits. V
circuit. With the V
pins have established connection, the UVLO circuit en-
sures that the backplane and card data and clock busses
are not connected until the transients associated with live
insertion have settled.
Figure 5 shows the LTC4300A-1 in a PCI application,
where all of the pins have the same length. In this case,
connect an RC series circuit on the I/O card between V
and ENABLE. An RC product of 10ms provides a filter to
prevent the LTC4300A-1 from becoming activated until
the transients associated with live insertion have settled.
12
CC2
SDA
SCL
V
CC
to the output of one of the CompactPCI power supply
R1
10k
BACKPLANE
R2
10k
Figure 5. Inserting Multiple I/O Cards into a Live Backplane Using the LTC4300A-1 in a PCI System
CC2
U
CC2
CONNECTOR
BACKPLANE
voltage powering up after all other
is monitored by a filtered UVLO
U
W
CC
bypassing on
U
CC
en-
R3
100k
R7
100k
CC
C2 0.1 F
C4 0.1 F
Figure 6 shows the LTC4300A-2 in an application where
the user has a custom connector with pins of three
different lengths available. Making V
ensures that all other pins are firmly connected before
V
ensures that the V
LTC4300A-2 connects the backplane to the card.
Repeater/Bus Extender Application
Users who wish to connect two 2-wire systems sepa-
rated by a distance can do so by connecting two
LTC4300A-1s back-to-back, as shown in Figure 7. The
I
tance, severely limiting the length of the bus. The SMBus
specification places no restriction on bus capacitance,
but the limited impedances of devices connected to the
bus require systems to remain small if rise- and fall-time
specifications are to be met. The strong pull-up and pull-
down impedances of the LTC4300A-1 are capable of
2
CC2
C specification allows for 400pF maximum bus capaci-
ENABLE
SDAIN
SCLIN
ENABLE
SDAIN
SCLIN
receives any voltage. A filtered UVLO circuit on V
I/O PERIPHERAL CARD 1
I/O PERIPHERAL CARD 2
LTC4300A-1
LTC4300A-1
GND
GND
V
V
U1
U2
•
•
•
CC
CC
CC2
C1
0.01 F
C3
0.01 F
SDAOUT
SDAOUT
SCLOUT
SCLOUT
READY
READY
pin is firmly connected before the
R4
10k
R8
10k
R5
10k
R9
10k
CC2
the shortest pin
R6
10k
R10
10k
sn4300a12 4300a12fs
4300A-1/2 F05
CARD_SDA
CARD_SCL
CARD2_SDA
CARD2_SCL
CC2