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| 型号： | LTC4311IDC#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 2/12页 |
| 文件大小： | 0K |
| 描述： | IC ACCELERATOR SMBUS DL 6-DFN |
| 产品培训模块： | LTC4310 - Hot-Swappable I²C Isolators |
| 标准包装： | 1 |
| 类型： | SMBus 加速器 |
| Tx/Rx类型： | I²C Logic |
| 电源电压： | 1.6 V ~ 5.5 V |
| 电流 - 电源： | 300µA |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-WFDFN 裸露焊盘 |
| 供应商设备封装： | 6-DFN-EP（2x2） |
| 包装： | 标准包装 |
| 产品目录页面： | 1355 (CN2011-ZH PDF) |
| 其它名称： | LTC4311IDC#TRMPBFDKR |
LTC4311
10
4311fa
APPLICATIONS INFORMATION
t
2 = –13kΩ 400pF
In
2.1V
+ 0.15V – 3.3V – 13kΩ2.5mA
0.9V – 3.3V – 13k
Ω2.5mA
= 0.205s
(20)
t
r = t1 + t2 = 0.515s + 0.205s = 0.72s
(21)
t
f = 293Ω 400pF
In
2.1V
+ 0.15V
3.3V
(13k
Ω+ 300Ω)– 300Ω
0.8V – 0.15V
3.3V
(13k
Ω+ 300Ω)– 300Ω
= 0.156s
(22)
The rise time meets the 1μs SMBus requirement and the
fall time meets the 0.3μs requirement. The VOL is satised
while meeting the minimum slew rate requirements, so RP
is chosen to be 13kΩ. If the rise time was not met due to
a large t1, equation 6 can be used to calculate a maximum
value of RP that will meet the rise time requirements.
ACK Data Setup Time
Care must be taken in selecting the value of RS (in series
with the pull-down driver) to ensure that the data setup
time requirement for ACK (acknowledge) is fullled. An
acknowledge is the host releasing the SDA line (pulling
high) at the end of the last bit sent and the slave device
pulling the SDA line low before the rising edge of the ACK
clock pulse.
The LTC4311 5mA pull-up current is activated when the
host releases the SDA line, allowing the voltage to rise
above the LTC4311’s comparator threshold (VTHR). If
a slave device has a high value of RS, a longer time is
required for the slave device to pull SDA low before the
rising edge of the ACK clock pulse. To ensure sufcient
data setup time for ACK, slave devices with high values
of RS should pull the SDA low earlier.
An alternative is the slave device can hold the SCL line low
until the SDA line reaches a stable state. Then, SCL can
be released to generate the ACK clock pulse.
Multiple LTC4311s in Parallel
In very heavily loaded systems, stronger pull up current
may be desired. Two LTC4311’s may be used in parallel
to increase the total pull up current to meet rise time
requirements.
Notes on Using the LTC4311 in LTC1694 Applications
Although the LTC1694 and LTC4311 are functionally similar
accelerators for I2C, SMBus, and other comparable open
drain/collector bus applications, the LTC4311 offers a lower
power, higher performance solution in a smaller package
as compared to the LTC1694. These and other differences
are listed in Table 1 and must be accounted for if using
the LTC4311 in LTC1694 applications.
Table 1. Differences Between LTC1694 and LTC4311
SPECIFICATION
LTC1694
LTC4311
COMMENTS
Enable Pin (typ)
N/A
1V
Allows the LTC4311 to be Disabled, Consuming Less than 5μA
VCC
2.7V – 6V
1.6V – 5.5V
Lower Operating Supply Voltage for Low Voltage Systems
ICC (typ), BUS1, BUS2 High
60μA
26μA
Lower Standby Current to Conserve Power
VTHRES (typ)
0.65V
Dependent on VCC
Tighter, Higher Noise Margins and Improved Rise Times
IPULL-UP (typ)
2.2mA
5mA
Stronger Slew-Limited Source Current for Slewing Higher Bus Capacitances
fMAX
100kHz
400kHz
Higher Operating Frequency for I2C’s Fast Mode Bus Specication
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