数据搜索系统，热门电子元器件搜索
  Chinese  ▼
ALLDATASHEETCN.COM

X  

预览 PDF HTML

PM6670AS 数据表(PDF) 30 Page - STMicroelectronics

部件名 PM6670AS
功能描述  Complete DDR2/3 memory power supplies controller
PDF  54 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

PM6670AS 数据表(HTML) 30 Page - STMicroelectronics

Back Button PM6670AS Datasheet HTML 26Page - STMicroelectronics PM6670AS Datasheet HTML 27Page - STMicroelectronics PM6670AS Datasheet HTML 28Page - STMicroelectronics PM6670AS Datasheet HTML 29Page - STMicroelectronics PM6670AS Datasheet HTML 30Page - STMicroelectronics PM6670AS Datasheet HTML 31Page - STMicroelectronics PM6670AS Datasheet HTML 32Page - STMicroelectronics PM6670AS Datasheet HTML 33Page - STMicroelectronics PM6670AS Datasheet HTML 34Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 30 / 54 page
background image
Device description
PM6670AS
30/54
7.1.4
Mode-of-operation selection
Figure 33. MODE and DDRSEL multifunction pin configurations
The PM6670AS has been designed to satisfy the widest range of applications involving
DDR2/3 memories, SSTL15-18 buses termination and I/O supplies for CPU/Chipset. The
device is provided with multilevel pins which allow the user to choose the appropriate
configuration. The MODE pin is used to firstly decide between fixed preset or adjustable
(user defined) output voltages.
When the MODE pin is connected to +5 V, the PM6670AS allows setting the VDDQ voltage
to 1.8 V or 1.5 V just forcing the DDRSEL multilevel pin to +5 V or to ground respectively
(see Figure 33a).
In this condition the Pulse-Skip feature is enabled. This device configuration is suitable for
standard DDR2/3 memory supply applications avoiding the need for an external, high
accuracy, divider for output voltage setting.
Applications requiring different output voltages can be managed by PM6670AS simply
setting the adjustable mode. If MODE pin voltage is higher than 4 V, the fixed output mode is
selected. Connecting an external divider to the MODE pin (Figure 33b), it is used as
negative input of the error amplifier and the output voltage is given by expression (21).
Equation 21
PM6670
DDRSEL
MODE
R9
R8
VDDQ
+5V
VREF
PM6670
DDRSEL
MODE
R9
R8
VDDQ
+5V
(a)
(b)
PM6670
DDRSEL
MODE
R9
R8
VDDQ
+5V
VREF
PM6670
DDRSEL
MODE
R9
R8
VDDQ
+5V
(a)
(b)
PM6670AS
PM6670AS
8
R
9
R
8
R
9
.
0
VDDQ
ADJ
+
⋅
=



Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54


数据表 下载

Go To PDF Page


链接网址



ALLDATASHEET是否为您带来帮助?  [ DONATE ] 

关于 Alldatasheet   |   广告服务   |   联系我们   |   隐私政策   |   数据表链接    |   链接交换   |   制造商名单
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com