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參數(shù)資料
| 型號： | LP2994M |
| 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： | SOP-8 |
| 文件頁數(shù)： | 11/15頁 |
| 文件大小： | 257K |
| 代理商： | LP2994M |
Typical Application Circuits
(Continued)
DDR-II Applications
With the separate V
DDQ
pin and an internal resistor divider it
is possible to use the LP2994 in applications utilizing DDR-II
memory. Figure 7 and Figure 8 show several implementa-
tions of recommended circuits with output curves displayed
in the Typical Performance Characteristics. Figure 7 shows
the recommended circuit configuration for DDR-II applica-
tions. The output stage is connected to the 1.8V rail and the
AVIN pin can be connected to either a 3.3V or 5V rail.
If it is not desirable to use the 1.8V rail it is possible to
connect the output stage to a 3.3V rail. Care should be taken
to not exceed the maximum junction temperature as the
thermal dissipation increases with lower V
TT
output voltages.
For this reason, it is not recommended to power PVIN off a
rail higher than the nominal 3.3V. The advantage of this
configuration is that it has the ability to source and sink a
higher maximum continuous current.
If standards other than SSTL-2 are required, such as
SSTL-3, it may be necessary to use a different scaling factor
than 0.5 times V
for regulating the output voltage. Sev-
eral options are available to scale the output to any voltage
required. One method is to level shift the output by using
feedback resistors from V
to the V
pin. This has
been illustrated in Figure 9 and Figure 10 Figure 9 shows
20045906
FIGURE 6. SSTL-2 Implementation with higher voltage rails
20045907
FIGURE 7. Recommended DDR-II Termination
20045908
FIGURE 8. DDR-II Termination with higher voltage rails
L
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相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LP2994MX | DDR Termination Regulator |
| LP2995LQX | DDR Termination Regulator |
| LP2995MX | DDR Termination Regulator |
| LP2995MR | DDR Termination Regulator |
| LP2995M | DDR Termination Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 標準包裝: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 標準包裝: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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(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 |
| LP2995LQ/7002047 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
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