Datasheet > FMS7857MTDT

FMS7857MTDT

更新时间： 2024-11-19 23:52:27

品牌	Logo	应用领域
其他 - ETC		时钟驱动器逻辑集成电路光电二极管
页数	文件大小	规格书
7页	42K
描述
Ten Distributed-Output Clock Driver

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FMS7857MTDT 数据手册

www.fairchildsemi.com

FMS7857

Phase Locked Loop Clock Driver

operation, AVDD must be connected to 2.5 Volts. In this

mode, the PLL will compare the phase and frequency

between the incoming clock and the feedback pin. First, it

will adjust the frequency to the desired value, and then, the

phase. The PLL has wide enough bandwidth to track any

incoming clock with modulation of ±1% of the clock period.

When AVDD is connected to GND, FMS7857 will be in

clock buffer mode. In this mode, the PLL is shut off and the

clock is bypassed for test proposes. Power down mode, when

connected to GND, will shut the PLL off and all the outputs

will be tri-stated.

Features

• Frequency Range of 60 to 170 MHz

• 10 outputs at 2.5 Volts

• Less than 100 pS of Output to Output Skew

• Less than 60 pS of Cycle to Cycle Jitter

• Dedicated Power Down pin

• Power Supply at 2.5V ± 0.2V

• Commercial Temperature Range

• Available in 48 pin TSSOP

Description

FMS7857 is a zero delay clock buffer designed for high fan

out applications. It has ten outputs with one dedicated output

for feedback. All the outputs are connected to VDD at 2.5 Volts.

When the input frequency falls below a suggested detection

frequency (less than 20 MHz), FMS7857 will enter the

power down mode.

FMS7857 is available in 48 pin TSSOP in commercial

temperature range.

To reduce ground bounce noise, the Phase Locked Loop (PLL)

has a dedicated power supply pin (AVDD). For normal

Block Diagram

V_DD

CONTROL

PWRDWN

LOGIC

MUX

CLK

PLL

FBIN

FBOUT

AV_DD

ADVANCED INFORMATION describes products that are not in full production at the time of printing. Specifications are based on

design goals and limited characterization. They may change without notice. Contact Fairchild Semiconductor for current information.

REV. 0.0.5 6/19/00

12 3 4 5 6 7

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