LTC4310CDD-2#PBF Linear Technology, LTC4310CDD-2#PBF Datasheet - Page 10

• Manufacturer Part Number: LTC4310CDD-2#PBF
• Description: IC I2C ISOLATOR SMBUS 10DFN
• Manufacturer: Linear Technology
• Type: Hot-Swap I²C Isolatorsr

Specifications of LTC4310CDD-2#PBF

• Tx/rx Type: I²C Logic
• Capacitance - Input: 10pF
• Voltage - Supply: 3 V ~ 5.5 V
• Current - Supply: 7mA
• Mounting Type: Surface Mount
• Package / Case: 10-DFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Delay Time: -

LTC4310-1/LTC4310-2
applicaTions inForMaTion
SDA, SCL Bus Pull-Up Resistor Value Selection
When the SDA (or SCL) bus is rising between 0V and
0.35 • V
(0.35 • V
300ns for the LTC4310-2. Users must quantify their
parasitic bus capacitance, C
up resistor, R
voltage and maximum bus switching frequency to en-
sure that each bus rises faster than the controlled rise
rate. For bus frequencies up to 100kHz, choose the
LTC4310-1 and refer to Figure 2 for the maximum pull-up
resistance to use. For bus frequencies between 100kHz
and 400kHz, choose the LTC4310-2 and refer to Figure 3
for the maximum pull-up resistance to use. Be sure to
include worst-case resistor tolerance when selecting
resistor value.
Rise Time Accelerators
The LTC4310’s rise time accelerator circuitry on the
SDA and SCL lines turns on during rising edges to
0
Figure 2. Maximum SDA,SCL Bus Pull-Up Resistor Value as a
Function of Parasitic Bus Capacitance for the LTC4310-1
16
14
12
CC
18
10
CC
8
6
4
2
0
1
)/900ns for the LTC4310-1 and to (0.35 • V
, the LTC4310 controls the bus rise rate to
BUS
V
, based on their bus pull-up supply
CC
= 3.3V
10
C
BUS(MAX)
V
BUS
CC
= 5V
, and choose a bus pull-
(pF)
100
431012 F02
1000
CC
)/
reduce the bus rise time. When the bus has risen
above 0.45 • V
slew-limited pull-up current, I
heavily loaded buses meet the rise time specifica-
tions. See the Typical Performance Characteris-
tics section for the rise time accelerator pull-up
current as a function of temperature and bus
capacitance. When either the bus has risen above
(V
turned on (whichever comes first), the LTC4310
deactivates its pull-up current to deter fighting
with the subsequent falling edge. Users must
ensure that the bus pull-up supply voltage V
V
SDA, SCL bus and source current into V
time accelerators are deactivated during start-up,
thermal shutdown, shutdown and after disconnec-
tion due to a stuck bus or failure to receive a transmis-
sion within 4.6ms.
CC
Figure 3. Maximum SDA,SCL Bus Pull-Up Resistor Value as
a Function of Parasitic Bus Capacitance for the LTC4310-2
CC
, so that the accelerators do not overdrive the
– 1V) or 300ns after the pull-up current has
18
16
14
12
10
8
6
4
2
0
1
V
CC
CC
, the LTC4310 turns on a strong,
= 3.3V
10
C
V
BUS(MAX)
CC
= 5V
(pF)
BOOST
100
, to help even
BUS
431012 F03
. The rise
1000
BUS
431012f
≥