Datasheet > SC931FA

SC931FA

更新时间： 2024-01-08 21:49:33

品牌	Logo	应用领域
摩托罗拉 - MOTOROLA		驱动逻辑集成电路
页数	文件大小	规格书
8页	153K
描述
PLL Based Clock Driver, 6 True Output(s), 0 Inverted Output(s), PQFP32, TQFP-32

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SC931FA 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
包装说明：	QFP, QFP32,.35SQ,32	Reach Compliance Code：	unknown
风险等级：	5.91	JESD-30 代码：	S-PQFP-G32
JESD-609代码：	e0	端子数量：	32
最高工作温度：	70 °C	最低工作温度：
封装主体材料：	PLASTIC/EPOXY	封装代码：	QFP
封装等效代码：	QFP32,.35SQ,32	封装形状：	SQUARE
封装形式：	FLATPACK	电源：	3.3 V
认证状态：	Not Qualified	子类别：	Clock Generators
标称供电电压：	3.3 V	表面贴装：	YES
技术：	CMOS	温度等级：	COMMERCIAL
端子面层：	Tin/Lead (Sn/Pb)	端子形式：	GULL WING
端子节距：	0.8 mm	端子位置：	QUAD
Base Number Matches：	1

SC931FA 数据手册

SEMICONDUCTOR TECHNICAL DATA

The SC931 is a 3.3V compatible, PLL based clock driver device targeted for high performance clock applications. With output

frequencies of up to 140MHz and output skews of 300ps the SC931 is ideal for the most demanding clock distribution designs.

The device employs a fully differential PLL design to minimize cycle to cycle and long term jitter. This parameter is of significant

importance when the clock driver is providing the reference clock for PLL’s on board todays microprocessors and ASiC’s. The

device offers 6 low skew outputs, and a choice between internal or external feedback. The feedback option adds to the flexibility

of the device, providing numerous input to output frequency relationships.

• Differential LVPECL Reference Input

• Fully Integrated PLL

• Output Shut Down Mode

• Output Frequency up to 140MHz

FA SUFFIX

32–LEAD TQFP PACKAGE

CASE 873A–02

• Compatible with PowerPC and Intel Microprocessors

• 32–Lead TQFP Packaging

• Power Down Mode

• ±100ps Typical Cycle–to–Cycle Jitter

The SC931 offers two power saving features for power conscious portable or “green” designs. The power down pin will

seemlessly reduce all of the clock rates by one half so that the system will run at half the potential clock rate to extend battery life.

The POWER_DN pin is synchronized internally to the slowest output clock rate. This allows the transition in and out of the

power–down mode to be output glitch free. In addition, the shut down control pins will turn off various combinations of clock

outputs while leaving a subset active to allow for total processor shut down while maintaining system monitors to “wake up” the

system when signaled. During shut down, the PLL will remain locked, if internal feedback is used, so that wake up time will be

minimized. The shut down and power down pins can be combined for the ultimate in power savings. The Shut_Dn pins are

synchronized to the clock internal to the chip to eliminate the possibility of generating runt pulses.

An internal feedback divide by 8 of the VCO frequency is compared with the input reference provided. The internal VCO is

running at 8x the input reference clock. The outputs can be configured to run at 4x, 2x, 1.25x or 0.66x the input reference

frequency. If the external feedback is selected, one of the SC931’s outputs must be connected to the Ext_FB pin. Using the

external feedback, numerous input/output frequency relationships can be developed.

The SC931 is fully 3.3V compatible and requires no external loop filter components. All control inputs accept LVCMOS or

LVTTL compatible levels while the outputs provide LVCMOS levels with the capability to drive terminated 50Ω transmission lines.

For series terminated applications, each output can drive two 50Ω transmission lines, effectively increasing the fanout to 1:12.

The device is packaged in a 32–lead TQFP package to provide the optimum combination of board density and cost.

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

This document contains information on a product under development. Motorola reserves the right to change or

discontinue this product without notice.

6/98

REV 0

Motorola, Inc. 1998

12 3 4 5 6 7 8

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与SC931FA相关器件

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SC931FAR2	MOTOROLA	获取价格	PLL BASED CLOCK DRIVER, 6 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP32, TQFP-32
SC9351	SILAN	获取价格	AUDIO SYSTEM CONTROL MCU
SC941110	CELDUC	获取价格	Power Solid State Relay
SC941160	CELDUC	获取价格	Power Solid State Relay
SC942110	CELDUC	获取价格	Power Solid State Relay
SC942120	CELDUC	获取价格	Power Solid State Relay
SC942160	CELDUC	获取价格	Power Solid State Relay
SC942900	CELDUC	获取价格	Power Solid State Relay
SC944110	CELDUC	获取价格	Power Solid State Relay
SC944160	CELDUC	获取价格	Power Solid State Relay

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