- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄381360 > ASM2I2318ANZ (Alliance Semiconductor Corporation) 18 Output, 3.3V SDRAM Buffer for Desktop PCs with 3 DIMMs PDF資料下載
參數(shù)資料
| 型號(hào)： | ASM2I2318ANZ |
| 廠商： | Alliance Semiconductor Corporation |
| 英文描述： | 18 Output, 3.3V SDRAM Buffer for Desktop PCs with 3 DIMMs |
| 中文描述： | 18個(gè)輸出，3.3V的SDRAM內(nèi)存緩沖器，用于桌面電腦，3個(gè)DIMM |
| 文件頁數(shù)： | 9/13頁 |
| 文件大?。?/td> | 547K |
| 代理商： | ASM2I2318ANZ |
June 2005
rev 0.3
ASM2I2318ANZ
18 Output, 3.3V SDRAM Buffer for Desktop PCs with 3 DIMMs
9 of
13
Notice: The information in this document is subject to change without notice.
Application Circuit
Rs = Series termination resistor
Ct = Optional cap to reduce EMI
Summary
Surface mount, low-ESR, ceramic capacitors should be used for filtering. Typically, these capacitors have a value of
0.1
μ
F. In some cases, smaller value capacitors may be required.
The value of the series terminating resistor satisfies the following equation, where Rtrace is the loaded characteristic
impedance of the trace, Rout is the output impedance of the buffer (typically 25
), and Rseries is the series terminating
resistor.
Rseries > Rtrace – Rout
Footprints must be laid out for optional EMI-reducing capacitors, which should be placed as close to the terminating
resistor as is physically possible. Typical values of these capacitors range from 4.7pF to 22pF.
A Ferrite Bead may
be used to isolate the Board V
DD
from the clock generator V
DD
island. Ensure that the Ferrite Bead
offers greater than 50
impedance at the clock frequency, under loaded DC conditions.
If a Ferrite Bead is used, a 10
μ
F–22
μ
F tantalum bypass capacitor should be placed close to the Ferrite Bead. This
capacitor prevents power supply droop during current surges.
Rs
BUF_IN
SCLK
V
DD
V
SS
ASM2I2318ANZ
48-Pin SSOP
CPUCLK
Rs
SDRAM(0:17)
C
t
SDRAM(0:17)
V
DDiic
0.1
F
0.1
F
+3.3V
V
DDiic
SDATA
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ASM2I2318ANZ-48-AR | JT 56C 48#20 8#16 PIN RECP |
| ASM2I2318ANZ-48-AT | Circular Connector; No. of Contacts:61; Series:MS27508; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:24; Circular Contact Gender:Pin; Circular Shell Style:Box Mount Receptacle; Insert Arrangement:24-61 RoHS Compliant: No |
| ASM2I3805AG-20-ST | 3.3V CMOS Buffer Clock Driver |
| ASM2P3805AG-20-SR | 3.3V CMOS Buffer Clock Driver |
| ASM2P3805AG-20-ST | 3.3V CMOS Buffer Clock Driver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ASM2I2318ANZ-48-AR | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:18 Output, 3.3V SDRAM Buffer for Desktop PCs with 3 DIMMs |
| ASM2I2318ANZ-48-AT | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:18 Output, 3.3V SDRAM Buffer for Desktop PCs with 3 DIMMs |
| ASM2I3805AG-20-AR | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:3.3V CMOS Buffer Clock Driver |
| ASM2I3805AG-20-AT | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:3.3V CMOS Buffer Clock Driver |
| ASM2I3805AG-20-DR | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:3.3V CMOS Buffer Clock Driver |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。