- 您現(xiàn)在的位置：買賣IC網 > PDF目錄360781 > ICS9214 Rambus XDR Clock Generator PDF資料下載
參數(shù)資料
| 型號： | ICS9214 |
| 英文描述： | Rambus XDR Clock Generator |
| 中文描述： | Rambus公司的XDR時鐘發(fā)生器 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 228K |
| 代理商： | ICS9214 |
11
Integrated
Circuit
Systems, Inc.
ICS9214
0809D—04/07/06
Figure 1. Differential and single-ended reference clock inputs
Clock Output Drivers
Figure 2 shows the clock driver equivalent circuit. The differential driver produces a specified voltage swing on the channel
by switching the currents going into ODCLK_T and ODCLK_C. The external resistor R
RC
at the IREFY pin sets the maximum
current. The minimum current is zero.
The voltage at the IREFY pin, V
IREFY
, is by design equal to 1 V nominally, and the driver current is seven times the current
flowing through R
RC
. So, the output low current can be estimated as I
OL
= 7/ R
RC
.
The driver output characteristics are defined together with the external resistors, R
1
, R
2
, and R
3
. The output clock signals are
specified at the measurement points indicated in Figure 2. Table 5 shows example values for the resistors.
R
1
, R
2
, and R
3
and the clock driver output impedance, Z
OUT
, must match the impedance of the channel, Z
CH
, to minimize
secondary reflections. Z
OUT
is specified as 1000 Ohms, minimum to accomplish this. The effective impedance can be
estimated by:
(1000R
1
/(1000+R
1
)+R2) R
3
/(1000R
1
/(1000+R
1
)+R
2
+R
3
)
Pull-up resistor R
T
terminates the transmission line at the load to minimize clock signal reflection signal reflections. Table 5
shows the resistor values for establishing and effective source termination impedance of 49.2 Ohms to match a 50 Ohm
channel. The termination voltages are 2.5 V for V
TS
and 1.2 V for V
T
. The resistor values R1 = 38.3 Ohms, R
2
= 19.1 Ohms, R
3
= 54.9 Ohms and R
RC
= 200 Ohms can be used to match a 28 Ohm channel.
Table 5. Example Resistor Values and Termination Voltages for a 50 Ohm Channel
1
Symbol
R
1
R
2
R
3
R
T
R
RC
V
TS
V
T
Notes:
Parameter
Value
Tolerance
Unit
Termination resistor
Termination resistor
Termination resistor
Termination resistor
Swing control resistor
Source termination voltage
Termination voltage
39.2
66.5
93.1
49.9
200
2.5
1.2
+/- 1%
+/- 1%
+/- 1%
+/- 1%
+/- 1%
+/-5%
+/-5%
V
V
1 A different set of resistors is used in Figure 2 when testing
for maximum output current of the clock driver (I
OLABS
).
These resistors are: R
1
= 34
, R
2
= 31.8
, R
3
= 48.7
,
R
T
=28
, R
RC
= 147
VTH
Input
Input
XDR
XDR
CLK_INC
CLK_INT
CLK_INT
a. Differential input
b. Single-ended input
Clock Generator
Clock Generator
Supply Voltage
相關PDF資料 |
PDF描述 |
|---|---|
| ICS9214YGLF-T | Rambus XDR Clock Generator |
| ICS9219 | Direct Rambus Clock Generator Lite |
| ICS9219YGLF-T | Direct Rambus Clock Generator Lite |
| ICS9248-171 | AMD - K7TM System Clock Chip |
| ICS9248YF-171-T | AMD - K7TM System Clock Chip |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ICS9214_07 | 制造商:ICSI 制造商全稱:Integrated Circuit Solution Inc 功能描述:RambusTM XDRTM Clock Generator |
| ICS9214DGLF | 功能描述:IC CLOCK GEN RAMBUS XDR 28-TSSOP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 專用 系列:- 標準包裝:28 系列:- 類型:時鐘/頻率發(fā)生器 PLL:是 主要目的:Intel CPU 服務器 輸入:時鐘 輸出:LVCMOS 電路數(shù):1 比率 - 輸入:輸出:3:22 差分 - 輸入:輸出:無/是 頻率 - 最大:400MHz 電源電壓:3.135 V ~ 3.465 V 工作溫度:0°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:64-TFSOP （0.240"，6.10mm 寬） 供應商設備封裝:64-TSSOP 包裝:管件 |
| ICS9214DGLFT | 功能描述:IC CLOCK GEN RAMBUS XDR 28-TSSOP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 專用 系列:- 標準包裝:28 系列:- 類型:時鐘/頻率發(fā)生器 PLL:是 主要目的:Intel CPU 服務器 輸入:時鐘 輸出:LVCMOS 電路數(shù):1 比率 - 輸入:輸出:3:22 差分 - 輸入:輸出:無/是 頻率 - 最大:400MHz 電源電壓:3.135 V ~ 3.465 V 工作溫度:0°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:64-TFSOP （0.240"，6.10mm 寬） 供應商設備封裝:64-TSSOP 包裝:管件 |
| ICS9214YGLF-T | 制造商:ICS 制造商全稱:ICS 功能描述:Rambus XDR Clock Generator |
| ICS9219 | 制造商:ICS 制造商全稱:ICS 功能描述:Direct Rambus Clock Generator Lite |
發(fā)布緊急采購，3分鐘左右您將得到回復。