- 您現(xiàn)在的位置：買賣IC網(wǎng) > Datasheet目錄42 > LTC4308IMS8#TRPBF (Linear Technology)IC BUS BUFFER LV 8-MSOP Datasheet資料下載
參數(shù)資料
| 型號： | LTC4308IMS8#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 9/16頁 |
| 文件大小： | 168K |
| 描述： | IC BUS BUFFER LV 8-MSOP |
| 產(chǎn)品培訓模塊： | LTC4310 - Hot-Swappable I²C Isolators |
| 標準包裝： | 2,500 |
| 類型： | 熱交換開關(guān) |
| 應用： | 通用型緩沖器/總線擴展器 |
| 內(nèi)部開關(guān)： | 是 |
| 電源電壓： | 2.3 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應商設(shè)備封裝： | 8-MSOP |
| 包裝： | 帶卷 (TR) |
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC4309IGN#TRPBF | IC BUS BUFFER 2-WIRE 16-SSOP |
| LTC4350IGN#PBF | IC CTLR HOTSWAP LOADSHARE 16SSOP |
| MAX1299CEAE+ | IC TEMP SENS W/ADC 16-SSOP |
| MAX14544ETA+T | IC ACCY SWITCH OVP PROTECT 8TDFN |
| MAX1617AMEE+T | IC REMOTE/LOCAL TEMP SNSR 16QSOP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4309CDE#PBF | 功能描述:IC BUS BUFFER 2-WIRE 12-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:119 系列:- 類型:熱交換控制器 應用:通用型，PCI Express? 內(nèi)部開關(guān):無 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
| LTC4309CDE#TRPBF | 功能描述:IC BUS BUFFER 2-WIRE 12-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標準包裝:50 系列:- 類型:熱交換控制器 應用:-48V 遠程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開關(guān):無 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應商設(shè)備封裝:10-MSOP 包裝:管件 |
| LTC4309CGN#PBF | 功能描述:IC BUS BUFFER 2-WIRE 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:119 系列:- 類型:熱交換控制器 應用:通用型，PCI Express? 內(nèi)部開關(guān):無 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
| LTC4309CGN#TRPBF | 功能描述:IC BUS BUFFER 2-WIRE 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標準包裝:50 系列:- 類型:熱交換控制器 應用:-48V 遠程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開關(guān):無 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應商設(shè)備封裝:10-MSOP 包裝:管件 |
| LTC4309IDE#PBF | 功能描述:IC BUS BUFFER 2-WIRE 12-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓模塊:Obsolescence Mitigation Program 標準包裝:100 系列:- 類型:熱插拔開關(guān) 應用:通用 內(nèi)部開關(guān):是 電流限制:可調(diào) 電源電壓:9 V ~ 13.2 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應商設(shè)備封裝:10-TDFN-EP（3x3） 包裝:管件 |
發(fā)布緊急采購，3分鐘左右您將得到回復。