Datasheet > PI6C991-2

PI6C991-2

更新时间： 2024-11-22 23:27:39

品牌	Logo	应用领域
其他 - ETC		时钟
页数	文件大小	规格书
9页	653K
描述
Clock IC \| 250ps Accuracy. 5V. TTL. 3.75 to 80 MHz

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PI6C991-2 数据手册

PI6C991

5V High-Speed Programmable

Skew Clock Buffer - SuperClock

Product Features

Description

• Four pairs of programmable skew outputs

• 3.75 to 80 MHz output operation

The PI6C991 is a low-skew, low jitter, 5V phase-lock loop (PLL)

programmable skew clock driver, for high performance comput-

ing and networking applications. This part offers user selectable

skew-control of 4 output pairs, providing the timing delays neces-

sary to optimize high performance clock distribution circuits.

• User-selectable output functions:

− Selectable skews

− Inverted and noninverted

Each output can be hardwired to one of nine delay or function

configurations. Delay increments are determined by the input clock

frequency and the configurations selected by the user.

− Operation at ½ and ¼ input frequency

− Operation at 2X and 4X input frequency

• Low skew <100ps typical, same pair. 250ps max.

• Allow REF clock input to have Spread Spectrum

modulation for EMI reduction

The PI6C991 allows the REF clock input to have Spread Spectrum

modulation for EMI reduction.

The PI6C991 is pin-compatible with Cypress RoboClock CY7B991,

with improvedAC/DC characteristics.

• 2X, 4X, ½ and ¼ outputs

• 3-level inputs for skew and output frequency control

• External feedback, internal loop filter

• Low cycle-to-cycle Jitter: <25ps RMS

• Duty cycle of output clock signals: 45% min. 55% max.

• Compatible with Pentium based processor

• Same pinout as Cypress CY7B991

• Packaged in Plastic 32-pin PLCC Package

Pin Configuration

Logic Block Diagram

32-Pin

PS8448A

10/10/00

12 3 4 5 6 7...9

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