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LTACF Datasheet(PDF) 10 Page - Linear Technology

Part # LTACF
Description  Hot Swappable 2-Wire Bus Buffers
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTACF Datasheet(HTML) 10 Page - Linear Technology

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LTC4300A-1/LTC4300A-2
10
sn4300a12 4300a12fs
Resistor Pull-Up Value Selection
The system pull-up resistors must be strong enough to
provide a positive slew rate of 1.25V/
µs 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:
R
≤ (VCC(MIN) – 0.6) (800,000) / C
where R is the pull-up resistor value in ohms, VCC(MIN) is
the minimum VCC voltage and C is the equivalent bus
capacitance in picofarads (pF).
APPLICATIO S I FOR ATIO
In addition, regardless of the bus capacitance, always
choose R
≤ 16k for VCC = 5.5V maximum, R ≤ 24k for
VCC = 3.6V maximum. The start-up circuitry requires logic
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
Figure 3. Inserting Multiple I/O Cards into a Live Backplane Using the LTC4300A-1 in a CompactPCI System
R13
10k
R12
10k
R14
10k
I/O PERIPHERAL CARD N
ENABLE
SDAIN
SCLIN
U3
LTC4300A-1
VCC
GND
CARDN_SCL
CARDN_SDA
SDAOUT
SCLOUT
READY
ENABLE
SDAIN
SCLIN
VCC
GND
SDAOUT
SCLOUT
READY
ENABLE
CARD
ENABLE/DISABLE
SDAIN
SCLIN
VCC
GND
SDAOUT
SCLOUT
READY
4300A-1/2 F03
R9
10k
R8
10k
R10
10k
I/O PERIPHERAL CARD 2
U2
LTC4300A-1
CARD2_SCL
CARD2_SDA
R5
10k
R4
10k
R6
10k
I/O PERIPHERAL CARD 1
U1
LTC4300A-1
CARD_SCL
CARD_SDA
R1
10k
VCC
R2
10k
BACKPLANE
BACKPLANE
CONNECTOR
SDA
BD_SEL
SCL
C1
0.01
µF
R3
10k
R7
10k
R11
10k
C3
0.01
µF
C5
0.01
µF
POWER SUPPLY
HOT SWAP
POWER SUPPLY
HOT SWAP
POWER SUPPLY
HOT SWAP
CARD
ENABLE/DISABLE
CARD
ENABLE/DISABLE



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