MPC950 Datasheet_PDF文件下载_芯片资料查询

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

Low Voltage PLL Clock Driver

The MPC950/951 are 3.3V compatible, PLL based clock driver

devices targeted for high performance clock tree designs. With output

frequencies of up to 180MHz and output skews of 375ps the MPC950 is

ideal for the most demanding clock tree designs. The devices employ a

fully differential PLL design to minimize cycle鈥搕o鈥揷ycle and long term

jitter. This parameter is of significant importance when the clock driver is

providing the reference clock for PLL鈥檚 on board today鈥檚 microprocessors

and ASiC鈥檚. The devices offer 9 low skew outputs, the outputs are

configurable to support the clocking needs of the various high

performance microprocessors.

MPC950

MPC951

LOW VOLTAGE

PLL CLOCK DRIVER

鈥?/div>

Fully Integrated PLL

鈥?/div>

Oscillator or Crystal Reference Input

鈥?/div>

Output Frequency up to 180MHz

鈥?/div>

Outputs Disable in High Impedance

鈥?/div>

Compatible with PowerPC鈩? Intel and High Performance RISC

Microprocessors

鈥?/div>

TQFP Packaging

鈥?/div>

Output Frequency Configurable

鈥?/div>

卤100ps

Typical Cycle鈥搕o鈥揅ycle Jitter

FA SUFFIX

32鈥揕EAD TQFP PACKAGE

CASE 873A鈥?2

Two selectable feedback division ratios are available on the MPC950

to provide input reference clock flexibility. The FBSEL pin will choose

between a divide by 8 or a divide by 16 of the VCO frequency to be

compared with the input reference to the MPC950. The internal VCO is

running at either 2x or 4x the high speed output, depending on

configuration, so that the input reference will be either one half, one fourth

or one eighth the high speed output.

The MPC951 replaces the crystal oscillator and internal feedback of the MPC950 with a differential PECL reference input and

an external feedback input. These features allow for the MPC951 to be used as a zero delay, low skew fanout buffer. In addition,

the external feedback allows for a wider variety of input鈥搕o鈥搊utput frequency relationships. The MPC951 REF_SEL pin allows for

the selection of an alternate LVCMOS input clock to be used as a test clock or to provide the reference for the PLL from an

LVCMOS source.

The MPC950 provides an external test clock input for scan clock distribution or system diagnostics. In addition the REF_SEL

pin allows the user to select between a crystal input to an on鈥揵oard oscillator for the reference or to chose a TTL level oscillator

input directly. The on鈥揵oard crystal oscillator requires no external components beyond a series resonant crystal.

Both the MPC950 and MPC951 are fully 3.3V compatible and require no external loop filter components. All inputs accept

LVCMOS or LVTTL compatible levels while the outputs provide LVCMOS levels with the capability to drive terminated 50鈩?/div>

transmission lines. Select inputs do not have internal pull鈥搖p/pull鈥揹own resistors and thus must be set externally. If the

PECL_CLK inputs are not used, they can be left open. For series terminated 50鈩?lines, each of the MPC950/951 outputs can

drive two traces giving the device an effective fanout of 1:18. The device is packaged in a 7x7mm 32鈥搇ead TQFP package to

provide the optimum combination of board density and performance.

PowerPC is a trademark of International Business Machines Corporation. Pentium is a trademark of Intel Corporation.

2/97

漏

Motorola, Inc. 1997

1

REV 4

型号

版本

描述

厂商

下载
MPC903

英文版

Motorola, Inc [1:6 PCI CLOCK GENERATOR/ FANOUT BUFFER]

MPC903
MPC904

英文版

1:6 PCI CLOCK GENERATOR/ FANOUT BUFFER

MPC904
MPC905

英文版

1:6 PCI Clock Qenerator/Fanout Buffer

MPC905
MPC909

英文版

Motorola, Inc [LOW VOLTAGE CMOS 1:18 CLOCK DISTRIBUTION CHI...

MPC909
MPC911

英文版

Motorola, Inc [LOW-VOLTAGE 1:9 DIFFERENTIAL ECL/HSTL TO HST...

MPC911
MPC930

英文版

Low Voltage PLL Clock Drlver

MPC930
MPC931

英文版

Low Voltage PLL Clock Drlver

MPC931
MPC932

英文版

Motorola, Inc [LOW VOLTAGE PLL CLOCK DRIVER]

MPC932
MPC940

英文版

Motorola, Inc [LOW VOLTAGE 1:18 CLOCK DISTRIBUTION CHIP]

MPC940
MPC941

英文版

Low Voltage 1:27 Clock Dlstrlbutlon Chlp

MPC941
MPC946

英文版

Motorola, Inc [LOW VOLTAGE 1:10 CMOS CLOCK DRIVER]

MPC946
MPC947

英文版

Motorola, Inc [LOW VOLTAGE 1:9 CLOCK DISTRIBUTION CHIP]

MPC947
MPC948

英文版

Motorola, Inc [LOW VOLTAGE 1:12 CLOCK DISTRIBUTION CHIP]

MPC948
MPC949

英文版

Motorola, Inc [LOW VOLTAGE 1:15 PECL TO CMOS CLOCK DRIVER]

MPC949
MPC950

英文版

Low Voltage PLL Clock Drlver

MPC950
MPC951

英文版

Low Voltage PLL Clock Drlver

MPC951
MPC952

英文版

Low Voltage PLL Clock Drlver

MPC952
MPC953

英文版

Low Voltage PLL Clock Drlver

MPC953
MPC954

英文版

Low Voltage PLL Clock Drlver

MPC954
MPC958

英文版

Low Voltage PLL Clock Drlver

MPC958

MPC950 Datasheet

PDF预览

MPC950相关型号PDF文件下载

您可能感兴趣的PDF文件资料

热门IC型号推荐

MPC950 Datasheet

PDF预览

MPC950相关型号PDF文件下载

您可能感兴趣的PDF文件资料

热门IC型号推荐

建议反馈

PDF纠错X