LTC4300A-1IMS8 Linear Technology, LTC4300A-1IMS8 Datasheet - Page 10

• Manufacturer Part Number: LTC4300A-1IMS8
• Description: IC BUFFER BUS 2WR HOTSWAP 8-MSOP
• Manufacturer: Linear Technology
• Type: Hot-Swap Switchr

Specifications of LTC4300A-1IMS8

• Applications: General Purpose, Buffer/Bus Extender
• Internal Switch(s): Yes
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°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
Resistor Pull-Up Value Selection
The system pull-up resistors must be strong enough to
provide a positive slew rate of 1.25V/ s on the SDA and
SCL pins, in order to activate the boost pull-up currents
during rising edges. Choose maximum resistor value R
using the formula:
where R is the pull-up resistor value in ohms, V
the minimum V
capacitance in picofarads (pF).
BD_SEL
10
SDA
SCL
R (V
V
CC
CC(MIN)
R1
10k
BACKPLANE
Figure 3. Inserting Multiple I/O Cards into a Live Backplane Using the LTC4300A-1 in a CompactPCI System
R2
10k
CC
– 0.6) (800,000) / C
U
voltage and C is the equivalent bus
CONNECTOR
BACKPLANE
U
W
U
CC(MIN)
POWER SUPPLY
POWER SUPPLY
POWER SUPPLY
HOT SWAP
HOT SWAP
HOT SWAP
is
In addition, regardless of the bus capacitance, always
choose R
V
high voltages on SDAOUT and SCLOUT to connect the
backplane to the card, and these pull-up values are needed
to overcome the precharge voltage.
Live Insertion and Capacitance Buffering Application
Figures 3 through 6 illustrate the usage of the LTC4300A
in applications that take advantage of both its hot swap
controlling and capacitance buffering features. In all of
CC
= 3.6V maximum. The start-up circuitry requires logic
R3
10k
R7
10k
R11
10k
ENABLE
SDAIN
SCLIN
ENABLE
SDAIN
SCLIN
ENABLE
SDAIN
SCLIN
CARD
ENABLE/DISABLE
CARD
ENABLE/DISABLE
CARD
ENABLE/DISABLE
I/O PERIPHERAL CARD 1
I/O PERIPHERAL CARD 2
I/O PERIPHERAL CARD N
16k for V
LTC4300A-1
LTC4300A-1
LTC4300A-1
GND
GND
GND
V
V
V
U1
U2
U3
CC
CC
CC
CC
C1
0.01 F
C3
0.01 F
C5
0.01 F
SDAOUT
SDAOUT
SDAOUT
= 5.5V maximum, R
SCLOUT
SCLOUT
SCLOUT
READY
READY
READY
R4
10k
R8
10k
R12
10k
R5
10k
R9
10k
R13
10k
sn4300a12 4300a12fs
R6
10k
R10
10k
R14
10k
4300A-1/2 F03
CARD_SDA
CARD_SCL
CARD2_SDA
CARD2_SCL
CARDN_SDA
CARDN_SCL
24k for