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参数资料
| 型号： | ASM2I2318ANZ-48-AT |
| 厂商： | ALLIANCE SEMICONDUCTOR CORP |
| 元件分类： | 时钟及定时 |
| 英文描述： | 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 |
| 中文描述： | 2318 SERIES, LOW SKEW CLOCK DRIVER, 18 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO48 |
| 封装： | 0.300 INCH, SSOP-48 |
| 文件页数： | 9/13页 |
| 文件大小： | 547K |
| 代理商： | ASM2I2318ANZ-48-AT |
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
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相关代理商/技术参数 |
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| ASM2I3805AG-20-AR | 制造商:ALSC 制造商全称:Alliance Semiconductor Corporation 功能描述:3.3V CMOS Buffer Clock Driver |
| ASM2I3805AG-20-AT | 制造商:ALSC 制造商全称:Alliance Semiconductor Corporation 功能描述:3.3V CMOS Buffer Clock Driver |
| ASM2I3805AG-20-DR | 制造商:ALSC 制造商全称:Alliance Semiconductor Corporation 功能描述:3.3V CMOS Buffer Clock Driver |
| ASM2I3805AG-20-DT | 制造商:ALSC 制造商全称:Alliance Semiconductor Corporation 功能描述:3.3V CMOS Buffer Clock Driver |
| ASM2I3805AG-20-SR | 制造商:ALSC 制造商全称:Alliance Semiconductor Corporation 功能描述:3.3V CMOS Buffer Clock Driver |
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