MPC970 Datasheet_PDF文件下载_芯片资料查询

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

Not Recommended for New Designs

See MPC972 or MPC974

Low Voltage PLL Clock Driver

The MPC970 is a 3.3V compatible, PLL based clock driver devices

targeted for high performance RISC or CISC processor based systems.

MPC970

鈥?/div>

Fully Integrated PLL

Output Frequency Up to 250MHz

Compatible with PowerPC鈩?and Pentium鈩?Processors

Output Frequency Configuration

On鈥揃oard Crystal Oscillator

52鈥揕ead TQFP Packaging

卤50ps

Typical Cycle鈥搕o鈥揅ycle Jitter

LOW VOLTAGE

PLL CLOCK DRIVER

The MPC970 was designed specifically to drive today鈥檚 PowerPC 601

and Pentium processors while providing the necessary performance to

address higher frequency PowerPC 601 as well as PowerPC 603 and

PowerPC 604 applications. The 2x_PCLK output can toggle at up to

250MHz while the remaining outputs can be configured to drive the other

system clocks for MPC 601 based systems. As the processor based

clock speeds increase the processor bus will likely run at one third or

FA SUFFIX

even one fourth the processor clock. The MPC970 supports the

52鈥揕EAD TQFP PACKAGE

necessary waveforms to drive the BCLKEN input signal of the MPC 601

CASE 848D鈥?3

when the processor bus is running at a lower frequency than the

processor. The MPC970 uses an advanced PLL design which minimizes

the jitter generated on the outputs. The jitter specification is well within the

requirements of the Pentium processor and meets the stringent

preliminary specifications of the PowerPC 603 and PowerPC 604

processors. The application section of this data sheet deals in more detail

with driving PowerPC and Pentium processor based systems.

The external feedback option of the MPC970 provides for a near zero delay between the reference clock input and the outputs

of the device. This feature is required in applications where a master clock is being picked up off the backplane and regenerated

and distributed on a daughter card. The advanced PLL of the MPC970 eliminates the dead zone of the phase detector and

minimizes the jitter of the PLL so that the phase error variation is held to a minimum. This phase error uncertainty makes up a

major portion of the part鈥搕o鈥損art skew of the device.

For single clock driver applications the MPC970 provides an internal oscillator and internal feedback to simplify board layout

and minimize system cost. By using the on鈥揵oard crystal oscillator the MPC970 acts as both the clock generator and distribution

chip. The external component is a relatively inexpensive crystal rather than a more expensive oscillator. Since in single board

applications the delay between the input reference and the outputs is inconsequential an internal feedback option is offered. The

internal feedback simplifies board design in that the system designer need not worry about noise being coupled into the feedback

line due to board parasitics and layout. The internal feedback is a fixed divide by 32 of the VCO. This divide ratio ensures that the

input crystals will be

鈮?0MHz,

thus keeping the crystal costs down and ensuring availability from multiple vendors.

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

1/97

漏

Motorola, Inc. 1997

1

REV 2

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

世界足球俱乐部杯

MPC970 Datasheet

PDF预览

MPC970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