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參數(shù)資料
| 型號(hào)： | LP2994 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | DDR Termination Regulator |
| 中文描述： | DDR終端穩(wěn)壓器 |
| 文件頁數(shù)： | 7/15頁 |
| 文件大?。?/td> | 257K |
| 代理商： | LP2994 |
Block Diagram
20045903
Description
The LP2994 is a linear bus termination regulator designed to
meet the JEDEC requirements of SSTL-2 and SSTL-3. The
output, V
is capable of sinking and sourcing current while
regulating the output voltage equal to V
/ 2. The output
stage has been designed to maintain excellent load regula-
tion while preventing shoot through. The LP2994 also incor-
porates two distinct power rails which separates the analog
circuitry from the power output stage. This allows a split rail
approach to be utilized to decrease internal power dissipa-
tion. It also permits the LP2994 to provide a termination
solution for the next generation of DDR-SDRAM memory
(DDRII).
Series Stub Termination Logic (SSTL) was created to im-
prove signal integrity of the data transmission across the
memory bus. This termination scheme is essential to prevent
data error from signal reflections while transmitting at high
frequencies encountered with DDR-SDRAM. The most com-
mon form of termination is Class II single parallel termina-
tion. This involves one R
S
series resistor from the chipset to
the memory and one R
termination resistor. Typical values
for R
and R
are 25 Ohms, although these can be changed
to scale the current requirements from the LP2994. This
implementation can be seen below in Figure 2
20045931
FIGURE 2. SSTL Termination Scheme
L
www.national.com
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相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LP2994M | DDR Termination Regulator |
| LP2994MX | DDR Termination Regulator |
| LP2995LQX | DDR Termination Regulator |
| LP2995MX | DDR Termination Regulator |
| LP2995MR | DDR Termination Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP2994EVAL | 功能描述:其他開發(fā)工具 LP2994 EVAL BOARD RoHS:否 制造商:Parallax 產(chǎn)品:ELEV-8 Hex Upgrade Kits 類型:Robotics 工具用于評(píng)估:ELEV-8 Quadcopter 工作電源電壓: |
| LP2994M/NOPB | 功能描述:IC DDR TERMINATION REG 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
| LP2994M/NOPB | 制造商:Texas Instruments 功能描述:Linear Voltage Regulator IC |
| LP2994MX/NOPB | 功能描述:IC REGULATOR DDR TERM 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
| LP2995LQ | 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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