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参数资料
| 型号： | LTC4307CDD-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/12页 |
| 文件大小： | 163K |
| 描述： | IC BUFFER 2-WIRE BUS 8-DFN |
| 产品培训模块： | LTC4310 - Hot-Swappable I²C Isolators |
| 标准包装： | 121 |
| 类型： | 热交换开关 |
| 应用： | 通用型缓冲器/总线扩展器 |
| 内部开关： | 是 |
| 电源电压： | 2.3 V ~ 5.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN-EP（3x3） |
| 包装： | 管件 |
LTC4307-1
9
43071fa
OPERATION
Figure 3 shows the LTC4307-1 in a capacitance buffering
application. Due to the LTC4307-1s capacitance buffering
feature and sub-10pF input capacitance, this application
circuit passes the HDMI 50pF maximum DDC capacitance
speci cation easily when the LTC4307-1 is located right at
the HDMI connector interface as shown. The capacitance
of the internal bus connected to the SDAIN and SCLIN
pins may be much larger than 50pF, but because of the
LTC4307-1s capacitance buffering, the internal bus ca-
pacitance is isolated from the HDMI connector.
APPLICATIONS INFORMATION
In HDMI, the sink device pulls the hot plug detect HPD
signal high to tell the source that it is ready to accept
commands through the DDC. This signal can be controlled
through the READY pin of the LTC4307-1 to prevent the
possibility of erroneous attempts by the source to contact
the sink before the sink is ready to return its extended
display identi cation data (EDID). The READY pin only
goes high after 5V is applied and the LTC4307-1 ENABLE
pin is pulled high by the HDMI receiver IC, a controller in
the sink, or the 5V line itself.
capacitance from 50pF to 150pF results in a t
PHL
increase
from 81ns to 91ns. Larger output capacitances translate
to longer delays (up to 125ns). Users must quantify the
difference in propagation times for a rising edge versus
a falling edge in their systems and adjust setup and hold
times accordingly.
READY Digital Output
This pin provides a digital ag which is low when either
ENABLE is low or the start-up sequence described earlier
in this section has not been completed. READY goes high
when ENABLE is high and the input and output 2-wire
busses are connected. The pin is driven by an open-drain
pull-down capable of sinking 3mA while holding 0.4V on
the pin. Connect a resistor to V
CC
to provide the pull-up.
READY can be used to control the HDMI hot plug detect
(HPD) signal to prevent the possibility of erroneous at-
tempts by the source to contact the sink before the sink
is ready to communicate.
ENABLE
When the ENABLE pin is driven below 0.8V with respect to
the LTC4307-1s ground, the input 2-wire bus is discon-
nected from the output 2-wire bus and the READY pin is
internally pulled low. When the pin is driven above 2V,
the part waits for data transactions on both 2-wire bus-
ses to be complete (as described in the Start-Up section)
before connecting the two sides. At this time the internal
pull-down on READY releases.
LTC4307 and LTC4307-1 Feature Differences
The LTC4307-1 HDMI level-shifting 2-wire bus buffer is
speci cally intended for HDMI applications. Features in
the general purpose LTC4307 device that are not required
in HDMI systems have been removed. In addition, level-
shifting functionality has been added to the LTC4307-1
to allow 3.3V HDMI devices to interface safely to the 5V
HDMI DDC bus. See Table 1 for a list of the differences
between the LTC4307 and LTC4307 -1.
Table 1. Differences Between the LTC4307 and the LTC4307-1
SPECIFICATION
LTC4307
LTC4307-1 COMMENTS ON LTC4307-1
Pre-charge
Yes
No
HDMI DDC Lines are Not Hot Swapped
Level Shifting
No
Yes,
2.2V to 5.5V
Provides Communication Between 3.3V and 5V DDC Busses,
Protects 3.3V Devices from 5V Supply
Stuck Bus Disconnect and Recovery
Yes
No
Stuck Busses, Not an Issue in HDMI Systems
Rise Time Accelerators
Yes
No
Complies with HDMI Speci cation Version 1.3 DDC Capacitance
Requirement
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| LTC4307CMS8#PBF | 制造商:Linear Technology 功能描述:IC, HOT SWAP BUS BUFFER, MSOP-8 |
| LTC4307CMS8#TRPBF | 功能描述:IC BUFFER 2-WIRE BUS 8-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 标准包装:50 系列:- 类型:热交换控制器 应用:-48V 远程电力系统，AdvancedTCA ? 系统，高可用性 内部开关:无 电流限制:可调 电源电压:11.5 V ~ 14.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| LTC4307CMS8-1#PBF | 功能描述:IC BUFFER 2-WIRE BUS 8-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:119 系列:- 类型:热交换控制器 应用:通用型，PCI Express? 内部开关:无 电流限制:- 电源电压:3.3V，12V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:80-TQFP 供应商设备封装:80-TQFP（12x12） 包装:托盘 产品目录页面:1423 (CN2011-ZH PDF) |
| LTC4307CMS8-1#TRPBF | 功能描述:IC BUFFER 2-WIRE BUS 8-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 标准包装:50 系列:- 类型:热交换控制器 应用:-48V 远程电力系统，AdvancedTCA ? 系统，高可用性 内部开关:无 电流限制:可调 电源电压:11.5 V ~ 14.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
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