- 您现在的位置：买卖IC网 > PDF目录19914 > LTC4308CDD#PBF (Linear Technology)IC BUS BUFFER LV 8-DFN PDF资料下载
参数资料
| 型号： | LTC4308CDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 168K |
| 描述： | IC BUS BUFFER LV 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 |
LTC4308
9
4308f
Propagation Delays
During a rising edge, the rise time on each side is in u-
enced by rise time acceleration, bus pull-up resistor, and
the equivalent capacitance on the line. If the pull-up resis-
tors are the same, a difference in rise time occurs which is
directly proportional to the difference in capacitance and
the presence of rise time acceleration between the two
sides. This effect is displayed in Figure 2 for V
CC
= 3.3V
and a 2.7k pull-up resistor on the input (V
PULLUP(IN)
=
1.8V , C
IN
= 150pF) and output (V
PULLUP(OUT)
= 3.3V , C
OUT
= 50pF). Since the output pin has rise time acceleration
and less capacitance than the input, it rises faster and
the effective propagation delay is negative.
There is a nite propagation delay through the connec-
tion circuitry for falling waveforms. Figure 3 shows the
falling edge waveforms for the same pull-up resistors and
equivalent capacitance conditions as used in Figure 2.
An external N-channel MOSFET device pulls down the
voltage on the side with 150pF capacitance; the LTC4308
pulls down the voltage on the opposite side with a delay
of 70ns. This delay is always positive and is a function of
supply voltage, temperature and the pull-up resistors and
equivalent bus capacitances on both sides of the bus.
The Typical Performance Characteristics section shows
propagation delay as a function of temperature and voltage
for 2.7k pull-up resistors and 50pF equivalent capacitance
on both sides of the part. Also, the Propagation Delay as
a function of Output Capacitance curve shows that larger
output capacitances translate to longer delays. 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.
Bus Stuck Low Timeout
SDAOUT and SCLOUT are each connected to an internal
timer. When SDAOUT or SCLOUT is low, its respective
timer is started. Each timer is only reset when its pin goes
high. If the bus stuck low does not go high within 30ms
(typical), the connection circuitry is disabled, breaking
the connection between the respective input and output
pins. In addition, after at least 40約, up to 16 clock pulses
at 8.5kHz (typical) are generated on the SCLOUT pin by
the LTC4308 in an attempt to free the stuck low bus. The
clock pulses are halted if the bus recovers to a logic high
condition before the completion of the full 16 pulses. A
stop bit is always generated on the SCLOUT and SDAOUT
pins to reset all devices on the bus.
If the stuck low SDAOUT or SCLOUT does not recover to
a logic high condition after the automatic clocking and
stop bit generation, the LTC4308 remains disconnected.
Should the bus free, the LTC4308 will reconnect the input
and output busses if a stop bit or bus idle condition is
detected, as speci ed in the Start Up section. Alternatively,
a rising edge on ENABLE forces the connection circuitry to
reconnect the input and output busses and reset the 30ms
timer if the bus remains in a stuck bus low condition.
Figure 2. Input-Output Rising Edge Waveforms
Figure 3. Input-Output Falling Edge Waveforms
OPERATION
200ns/DIV
4308 F02
C
OUT
= 50pF
V
PULLUP(OUT)
= V
CC
= 3.3V
C
IN
= 150pF
V
PULLUP(IN)
= 1.8V
200ns/DIV
4308 F03
C
OUT
= 50pF
V
PULLUP(OUT)
= V
CC
= 3.3V
C
IN
= 150pF
V
PULLUP(IN)
= 1.8V
相关PDF资料 |
PDF描述 |
|---|---|
| VE-JNL-CY-B1 | CONVERTER MOD DC/DC 28V 50W |
| HSM36DSEH | CONN EDGECARD 72POS .156 EYELET |
| AT18F002-30XU | IC FLASH CONFIG 2MBIT 20-TSSOP |
| LTC4307CDD-1#PBF | IC BUFFER 2-WIRE BUS 8-DFN |
| LTC4216IMS#PBF | IC CNTRLR HOT SWAP 10-MSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4308CMS8#PBF | 功能描述:IC BUS BUFFER LV 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) |
| LTC4308CMS8#PBF | 制造商:Linear Technology 功能描述:IC HOT SWAP BUS BUFFER MSOP-8 |
| LTC4308CMS8#TRPBF | 功能描述:IC BUS BUFFER LV 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 |
| LTC4308IDD#PBF | 功能描述:IC BUS BUFFER LV 8-DFN 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) |
| LTC4308IDD#TRPBF | 功能描述:IC BUS BUFFER LV 8-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
发布紧急采购，3分钟左右您将得到回复。