MPC980 查看數據表（PDF） - Motorola => Freescale

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MPC980

DUAL 3.3V PLL CLOCK GENERATOR

Motorola => Freescale 

MPC980

DC CHARACTERISTICS (TA = 0° to 70°C)

Symbol

Characteristic

Min

Typ

Max

Unit

VCC

Power Supply Voltage

3.3–5%

3.3

3.3+5%

V

VIL

VIH

VOH

Input LOW Voltage

Input HIGH Voltage

Output HIGH Voltage

0.7VCC

VCC –0.4

0.3VCC

V

VCC

V

V

VOL

Output LOW Voltage

0.4

V

CIN

Input Capacitance

4.5

pF

CPD

Power Dissipation Capacitance

25

pF

ICC

Quiescent Supply Current

190

mA

ICCA

PLL Supply Current

20

mA

1. Output can drive two series terminated 50Ω transmission lines or a single 50Ω line terminated 50Ω into VCC/2.

Condition

–20mA (Note 1.)

+20mA (Note 1.)

AC CHARACTERISTICS (TA = 0° to 70°C, VCC = 3.3V ±5%)

Symbol

Characteristic

Min

fXtal

fmax

Input Crystal Frequency

Maximum Output Frequency

QP

QPCI

tdc

Output Duty Cycle

tCYCLE/2

–1000

tjitter

Cycle–to–Cycle Jitter

(Peak–to–Peak)

66/33MHz

60/30MHz

50/25MHz

tskew

Output–to–Output Skew

QP to QP

QPCI to QPCI

QP to QPCI

tdelay

Time Delay

QP to QPCI

2

tr, tf

Output Rise/Fall Time

0.05

tLOCK

PLL Lock Time

tPZL, tPZH

Output Enable Time

3

tPLZ, tPHZ

Output Disable Time

4

Typ

Max

14.31818

66

33

tCYCLE/2 tCYCLE/2

±500

+1000

±150

±200

±250

350

350

500

1

4fQP

) 1 1

4fQP

0.8

10

10

11

Unit

MHz

MHz

ps

ps

ps

ns

ns

ms

ns

ns

Condition

Rising Edges Only;

Dly_PCI = 0

Dly_PCI = 1

1.0 to 1.8V

50Ω to VCC/2

50Ω to VCC/2

APPLICATIONS INFORMATION

Using the On–Board Crystal Oscillator

The MPC980 features an on–board crystal Oscillator to

allow for seed clock generation as well as final distribution.

The on–board Oscillator is completely self contained so that

the only external component required is the crystal. As the

Oscillator is somewhat sensitive to loading on its inputs the

user is advised to mount the crystal as close to the MPC980

as possible to avoid any board level parasitics. To facilitate

co–location surface mount crystals are recommended, but

not required.

The Oscillator circuit is a series resonant circuit as

opposed to the more common parallel resonant circuit, this

eliminates the need for large on–board capacitors. Because

the design is a series resonant design for the optimum

frequency accuracy a series resonant crystal should be used

(see specification table below). Unfortunately most off the

shelf crystals are characterized in a parallel resonant mode.

However a parallel resonant crystal is physically no different

than a series resonant crystal, a parallel resonant crystal is

simply a crystal which has been characterized in its parallel

MOTOROLA

4

ECLinPS and ECLinPS Lite

DL140 — Rev 3

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