Datasheet > MPC991

MPC991

更新时间： 2024-11-10 22:28:19

品牌	Logo	应用领域
摩托罗拉 - MOTOROLA		时钟驱动器
页数	文件大小	规格书
9页	150K
描述
LOW VOLTAGE PLL CLOCK DRIVER

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

MPC991 数据手册

SEMICONDUCTOR TECHNICAL DATA

The MPC990/991 is a 3.3V compatible, PLL based ECL/PECL clock

driver. The fully differential design ensures optimum skew and PLL jitter

performance. The performance of the MPC990/991 makes the device

ideal for Workstation, Mainframe Computer and Telecommunication

applications. The MPC990 and MPC991 devices are identical except in

the interface to the reference clock for the PLL. The MPC990 offers an

on–board crystal oscillator as the PLL reference while the MPC991 offers

a differential ECL/PECL input for applications which need to lock to an

existing clock signal. Both designs offer a secondary single–ended ECL

clock for system test capabilities.

LOW VOLTAGE

PLL CLOCK DRIVER

• Fully Integrated PLL

• Output Frequency Up to 400MHz

• ECL/PECL Inputs and Outputs

• Operates from a 3.3V Supply

• Output Frequency Configurable

• TQFP Packaging

• ±50ps Cycle–to–Cycle Jitter

The MPC990/991 offers three banks of outputs which can each be

programmed via the the four fsel pins of the device. There are 16 different

output frequency configurations available in the device. The

configurations include output ratios of 1:1, 2:1, 3:1, 3:2, 4:1, 4:3, 4:3:1 and

4:3:2. The programming table in this data sheet illustrates the various

programming options. The SYNC output monitors the relationship

between the Qa and Qc output banks. The output pulses per the timing

diagrams in this data sheet signal the coincident edges of the two output

FA SUFFIX

52–LEAD TQFP PACKAGE

CASE 848D–03

banks. This feature is useful for non binary relationships between output frequencies (i.e., 3:2 or 4:3 relationships). The Sync_Sel

input toggles the Qd outputs between sync signals and extensions to the Qc bank of outputs.

The MPC990/991 provides a separate output for the feedback to the PLL. This allows for the feedback frequency to be

programmed independently of the other outputs allowing for unique input vs output frequency relationships. The fselFB inputs

provide 6 different feedback frequencies from the QFB differential output pair.

The MPC990/991 features an external differential ECL/PECL feedback to the PLL. This external feedback feature allows for

the MPC991’s use as a “zero” delay buffer. The propagation delay between the input reference and the output is dependent on

the input reference frequency. The selection of higher reference frequencies will provide near zero delay through the device.

The PLL_En, Ref_Sel and the Test_Clk input pins provide a means of bypassing the PLL and driving the output buffers

directly. This allows the user to single step a design during system debug. Note that the Test_Clk input is routed through the

dividers so that depending on the programming several edges on the Test_Clk input will be needed to get corresponding edge

transitions on the outputs. The VCO_Sel input provides a means of recentering the VCO to provide a broader range of VCO

frequencies for stable PLL operation.

If the frequency select or the VCO_Sel pins are changed during operation, a master reset signal must be applied to ensure

output synchronization and phase–lock. If the VCO is driven beyond its maximum frequency, the VCO can outrun the internal

dividers when the VCO_Sel pin is low. This will also prevent the PLL from achieving lock. Again, a master reset signal will need to

be applied to allow for phase–lock. The device employs a power–on reset circuit which will ensure output synchronization and

PLL lock on initial power–up.

2/97

REV 2

Motorola, Inc. 1997

12 3 4 5 6 7...9

中文翻译

下载PDF

与MPC991相关器件

型号	品牌	获取价格	描述	数据表
MPC991FAR2	MOTOROLA	获取价格	ECL SERIES, PLL BASED CLOCK DRIVER, 13 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP52, TQFP-
MPC992	MOTOROLA	获取价格	LOW VOLTAGE PLL CLOCK DRIVER
MPC992FA	NXP	获取价格	375MHz, PROC SPECIFIC CLOCK GENERATOR, PQFP32, LQFP-32
MPC992FA	MOTOROLA	获取价格	Clock Generator, 375MHz, CMOS, PQFP32, PLASTIC, TQFP-32
MPC992FA	IDT	获取价格	Clock Generator, 375MHz, PQFP32, LQFP-32
MPC993	MOTOROLA	获取价格	Dynamic Switch PLL Clock Driver
MPC993FA	NXP	获取价格	IC,1:5 OUTPUT, DIFFERENTIAL,CMOS,QFP,32PIN,PLASTIC
MPC993FA	MOTOROLA	获取价格	PLL Based Clock Driver, MPC900 Series, 5 True Output(s), 0 Inverted Output(s), CMOS, PQFP3
MPC993FAR2	MOTOROLA	获取价格	MPC900 SERIES, PLL BASED CLOCK DRIVER, 5 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP32, PLA
MPC9952FA	NXP	获取价格	IC,1:11 OUTPUT,QFP,32PIN,PLASTIC

与MPC991相关文章

国产厂商思特威CMOS图像传感器芯片单月出货超1亿颗，技术创新引领行业发展
2024-11-14

23
台积电5nm和3nm产能利用率达100%，半导体行业景气度持续攀升
2024-11-14

7
AMD宣布全球裁员约1000人，调整战略聚焦增长
2024-11-14

8
英伟达新AI芯片Rubin或提前半年亮相
2024-11-05

31

产品中心

服务支持

精选活动

关于我们

帮助中心

MPC991

MPC991 数据手册

与MPC991相关器件

与MPC991相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

MPC991

MPC991 数据手册

与MPC991相关器件

与MPC991相关文章

您还可以找

您在本页遇到什么问题？