MPC953 查看數據表（PDF） - Motorola => Freescale

零件编号

产品描述 (功能)

生产厂家

MPC953

Low Voltage PLL Clock Driver

Motorola => Freescale 

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

Product Preview

Low Voltage PLL Clock Driver

The MPC953 is a 3.3V compatible, PLL based clock driver device

targeted for high performance clock tree designs. With output frequencies

of up to 87.5MHz and output skews of 150ps the MPC953 is ideal for the

most demanding clock tree designs. The devices employ a fully

differential PLL design to minimize cycle–to–cycle and phase jitter.

• Fully Integrated PLL

• Output Frequency up to 87.5MHz

• Outputs Disable in High Impedance

• TQFP Packaging

• 100ps Cycle–to–Cycle Jitter

The MPC953 has a differential LVPECL reference input along with an

external feedback input. These features make the MPC953 ideal for use

as a zero delay, low skew fanout buffer. The device performance has

been tuned and optimized for zero delay performance. The MR/OE input

pin will reset the internal counters and tristate the output buffers when

driven “high”.

If the reference clock (PECL_CLK) is lost or shut down when the

MPC953 is in phase–lock, the output frquency will slew slowly downward.

The final VCO frequency will be around TBDMHz.

The MPC953 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

ability to drive terminated 50Ω transmission lines. For series terminated

50Ω lines, each of the MPC953 outputs can drive two traces giving the

device an effective fanout of 1:18. The device is packaged in a 7x7mm

32–lead TQFP package to provide the optimum combination of board

density and performance.

PECL_CLK

PECL_CLK

FB_CLK

VCO_SEL

BYPASS

MR/OE

Phase

Detector

LPF

VCO

200–350MHz

÷2

Figure 1. Logic Diagram

MPC953

LOW VOLTAGE

PLL CLOCK DRIVER

FA SUFFIX

32–LEAD TQFP PACKAGE

CASE 873A–02

QFB

7 Q0:6

÷4

Q7

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

discontinue this product without notice.

9/97

© Motorola, Inc. 1997

1

REV 0.1

Share Link: