XRK39351

更新时间： 2024-11-06 03:13:51

品牌	Logo	应用领域
艾科嘉 - EXAR		时钟驱动器输出元件
页数	文件大小	规格书
10页	304K
描述
3.3V OR 2.5V, 9-OUTPUT PLL CLOCK DRIVER

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数据手册

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XRK39351 数据手册

PRELIMINARY

XRK39351

3.3V OR 2.5V, 9-OUTPUT PLL CLOCK DRIVER

FEBRUARY 2006

REV. P1.0.0

input is pulled low. This is a test mode intended for

system debug purposes.

GENERAL DESCRIPTION

The XRK39351 is a low voltage PLL based clock

driver designed for high speed clock distribution

applications.

The XRK39351 has an output/input frequency range

of 25MHz to 200MHz with the PLL enabled and an

input frequency range of 2MHz to 300MHz when the

PLL is disabled (test mode).

The XRK39351 has two reference clock inputs, one

LVPECL and the other LVCMOS. The REF_SEL

input selects clock input to be used as the PLL’s

reference source.

FEATURES

• 9 LVCMOS Outputs (4 banks)

• 25 - 200 MHz output frequency range

• Fully Integrated PLL

The XRK39351 uses PLL technology to frequency

lock its outputs to the clock reference input. The

divider in the feedback path will determine the

frequency of the VCO. The XRK39351 provides 9

LVCMOS outputs that are separated into 4 banks.

Each of the separate output banks can individually

divide down the VCO output frequency. This allows

the XRK39351 to generate a variety of output-to-input

frequency ratios (1:1, 1:2, 1:4, 2:1 and 4:1). All

outputs provide LVCMOS compatible levels while

driving 50Ω terminated transmission lines.

• 2.5V or 3.3V Operation

• Selectable reference clock input, LVCMOS or

LVPECL

• 150ps max output to output skew

• Pin compatible with MPC9351

• Industrial temp range: -40°C to +85°C

• 32-Lead TQFP Packaging

The input reference clock can be directly applied to

the output dividers bypassing the PLL when PLL_EN

FIGURE 1. BLOCK DIAGRAM OF THE XRK39351

REF_SEL

÷ 2

TCLK

Ref

PECL

PLL

FB_IN

VDD

PLL_EN

SELA

SELB

SELC

SELD

QC0

QC1

QD0

QD1

QD2

QD3

QD4

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com

12 3 4 5 6 7...10

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