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参数资料
| 型号： | NE57814DD |
| 厂商： | NXP Semiconductors N.V. |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | DDR memory termination regulator with standby mode and enhanced efficiency |
| 封装： | NE57814DD<SOT786-2 (HSO8)|<<http://www.nxp.com/packages/SOT786-2.html<1<week 13, 2004,; |
| 文件页数： | 10/16页 |
| 文件大小： | 203K |
| 代理商： | NE57814DD |
Philips Semiconductors
Product data
NE57814
DDR memory termination regulator with
standby mode and enhanced efficiency
2003 Apr 03
10
Single-supply operating mode (V
DD
supply only)
For single-supply operation, connect the V
D
pin to the V
DD
pin. This
is suitable for use in a desktop computer or other non
efficiency-sensitive application (see Figure 12).
Externally setting V
TT
The NE57814 allows use of an external reference voltage applied to
the ExtRefIn pin to set the V
TT
output voltage. This pin is used for
applications where the V
TT
voltage is not equal to V
DD
divided by 2.
The needed V
TT
voltage and current may be drawn from a power
supply bus that is not the DDR RAM supply voltage. This may have
some advantages when the system designer is attempting to better
match the power being drawn from the outputs emerging from main
system power supply.
The internal reference voltage is set by two matched 100 k
resistors connected in a resistor divider between the V
DD
and Vss
pins of the NE57814. Setting the value of V
ref
or V
TT
can be done in
two ways: by using an external resistor divider whose resistor values
are less than 5 k
each or by connecting the output of an
operational amplifier which is outputting the reference voltage to the
ExtRefIn pin.
If the external resistor divider is used, place a 0.01
μ
F ceramic
bypass capacitor between the ExtRefIn pin (pin 6) and the V
SS
pin
(pin 1). The accuracy of the new reference voltage when the
external resistor divider is used will be about 0.5 percent PLUS the
sum of the tolerances of the resistors used in the divider.
Please note that when the NE57814 is operating in this fashion, the
power dissipation of the part may increase.
SL01886
V
DD
5
ExtRefIn
6
V
SS
1
V
TT
3
V
TT
SENSE
2
RefOut
8
V
D
4
50
μ
F
(Y5V)
0.1
μ
F
(Y5V)
NE57814
470
μ
F
(Electro)
0.1
μ
F
(Y5V)
0.1
μ
F
(Y5V)
10
μ
F
(Y5V)
100
μ
F
(Electro)
Figure 12. Single-supply operation.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NE57814DD,518 | 功能描述:线性稳压器 - 标准 DDR TERMINATOR REG RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| NE57814DD518 | 制造商:Rochester Electronics LLC 功能描述: 制造商:NXP 功能描述: 制造商:NXP Semiconductors 功能描述: |
| NE57835 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:TRANSISTOR | BJT | NPN | 11V V(BR)CEO | 30MA I(C) | SOT-173 |
| NE578D | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Compander |
| NE-58 | 制造商:Visual Communications Company (VCC) 功能描述:NE-58 /Refer New Part # F4A |
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