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參數(shù)資料
| 型號： | LP2995MRX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | DDR Termination Regulator |
| 中文描述： | BUS TERMINATOR SUPPORT CIRCUIT, PDSO8 |
| 封裝： | PSOP-8 |
| 文件頁數(shù)： | 6/13頁 |
| 文件大?。?/td> | 291K |
| 代理商： | LP2995MRX |
Block Diagram
20039301
Description
The LP2995 is a linear bus termination regulator designed to
meet the JEDEC requirements of SSTL-2 and SSTL-3. The
LP2995 is capable of sinking and sourcing current at the
output V
TT
, regulating the voltage to equal VDDQ / 2. A
buffered reference voltage that also tracks VDDQ / 2 is
generated on the V
pin for providing a global reference to
the DDR-SDRAM and Northbridge Chipset. V
is designed
to track the V
voltage with a tight tolerance over the
entire current range while preventing shoot through on the
output stage.
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 RAM. The most common
form of termination is Class II single parallel termination. This
involves using one Rs series resistor from the chipset to the
memory and one Rt termination resistor. This implementa-
tion can be seen below in
Figure 1
.
Typical values for R
S
and R
T
are 25 Ohms although these
can be changed to scale the current requirements from the
LP2995. For determination of the current requirements of
DDR-SDRAM termination please refer to the accompanying
application notes.
20039308
FIGURE 1.
L
www.national.com
6
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LP2995MRX/NOPB | 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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP2995MX | 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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP2995MX/J7001045 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| LP2995MX/NOPB | 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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP2995MX-NOPB | 制造商:Texas Instruments 功能描述: |
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