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參數(shù)資料
| 型號： | MK1491-14 |
| 英文描述： | OPTi ACPI Firestar Clock Source |
| 中文描述： | 奧普蒂ACPI的FireStar在時鐘源 |
| 文件頁數(shù)： | 4/4頁 |
| 文件大?。?/td> | 69K |
| 代理商： | MK1491-14 |
MK1491-14
OPTi ACPI Firestar Clock Source
MDS 1491-14 B
Integrated Circuit Systems, Inc. 525
Race Street San Jose CA 95126 (408)295-9800tel www.icst.com
4
Revision 061801
While the information presented herein has been checked for both accuracy and reliability, MicroClock Incorporated assumes no responsibility for either its use or for the
infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in
normal commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements
are not recommended without additional processing by MicroClock. MicroClock reserves the right to change any circuitry or specifications without notice. MicroClock does not
authorize or warrant any MicroClock product for use in life support devices or critical medical instruments.
b
D
E
H
e
Q
c
A
h x 45°
Package Outline and Package Dimensions
Ordering Information
28 pin SSOP
Inches
Min
0.061
0.008
0.007
0.385
0.150
0.230
e .025 BSC 0.635 BSC
h
0.016
Q
0.004
0.01
Millimeters
Min
1.55
0.203
0.190
9.780 10.160
3.810
5.840
Symbol
A
b
c
D
E
H
Max
0.068
0.012
0.010
0.400
0.160
0.245
Max
1.73
0.305
0.254
4.064
6.223
0.410
0.254
0.127
Part/Order Number
MK1491E-14R
MK1491E-14RTR
Marking
MK1491E-14R
MK1491E-14R
Low EMI Feature
Yes
Yes
Package
28 pin SSOP
Add Tape & Reel
Temperature
0-70°C
-
I/O Structure
The MK1491 provides more functionality in a 28 pin package by using a
unique I/O technique. The device checks the status of all I/O pins during
power-up. This status (pulled high or low) then determines the frequency
selections and power down modes (see the tables on page 2). Within 10ms
after power up, the inputs change to outputs and the clocks start up. In the
diagrams to the right, the 33
resistors are the normal output
termination resistors. The 10k
resistor pulls low to generate a logic
zero. Internal pull-up resistors are present on all inputs to generate a logic
one when an external pull-down resistor is not connected.
Pentium is a trademark of Intel Corporation
to load
I/O
to load
I/O
For select
= 0 (low)
For select
= 1 (high)
10k
33
33
External Components
The MK1491 requires some inexpensive external components for proper operation. Decoupling capacitors of 0.1μF should be connected on
each VDD pin to ground, as close to the MK1491 as possible. A series termination resistor of 33
may be used for each clock output. See the
discussion on page 4 for other external resistors required for proper I/O operation. The 14.318 MHz oscillator has internal caps that provide
the proper load for a parallel resonant crystal with CL=18pF. For tuning with other values of CL, the formula 2(CL-18) gives the value of each
capacitor that should be connected between X1 and ground and X2 and ground.
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| MK1491E-14R | 功能描述:IC CLK SRC OPTI ACPI FIRE 28QSOP RoHS:否 類別:集成電路 (IC) >> 時鐘/計時 - 專用 系列:- 標準包裝:1,500 系列:- 類型:時鐘緩沖器/驅(qū)動器 PLL:是 主要目的:- 輸入:- 輸出:- 電路數(shù):- 比率 - 輸入:輸出:- 差分 - 輸入:輸出:- 頻率 - 最大:- 電源電壓:3.3V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SSOP（0.209"，5.30mm 寬） 供應商設備封裝:28-SSOP 包裝:帶卷 (TR) 其它名稱:93786AFT |
| MK1491E-14RLF | 功能描述:IC CLK SRC OPTI ACPI FIRE 28QSOP 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 |
| MK1491E-14RLFTR | 功能描述:IC CLK SRC OPTI ACPI FIRE 28QSOP 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 |
| MK1491E-14RTR | 功能描述:IC CLK SRC OPTI ACPI FIRE 28QSOP RoHS:否 類別:集成電路 (IC) >> 時鐘/計時 - 專用 系列:- 標準包裝:1,500 系列:- 類型:時鐘緩沖器/驅(qū)動器 PLL:是 主要目的:- 輸入:- 輸出:- 電路數(shù):- 比率 - 輸入:輸出:- 差分 - 輸入:輸出:- 頻率 - 最大:- 電源電壓:3.3V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SSOP（0.209"，5.30mm 寬） 供應商設備封裝:28-SSOP 包裝:帶卷 (TR) 其它名稱:93786AFT |
| MK1492-03R | 功能描述:時鐘驅(qū)動器及分配 INTEL MOBILE/SDRAM CLOCK SOURCE RoHS:否 制造商:Micrel 乘法/除法因子:1:4 輸出類型:Differential 最大輸出頻率:4.2 GHz 電源電壓-最大: 電源電壓-最小:5 V 最大工作溫度:+ 85 C 封裝 / 箱體:SOIC-8 封裝:Reel |
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