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507M-01

PECL CLOCK SYNTHESIZER

Integrated Device Technology 

ICS507-01

PECL CLOCK SYNTHESIZER

PECL MULTIPLIER

External Component Selection

The ICS507-01 requires a minimum number of external

components for proper operation.

Decoupling Capacitors

Decoupling capacitors of 0.01µF should be connected

between VDD and GND on pins 2 and 5, as close to the

ICS507-01 as possible. Other VDD and GND

connections should be connected to those pins, or to

the VDD and GND planes on the board. A resistor must

be connected between the RES (pin 10) and VDD.

Another four resistors are needed for the PECL outputs

as shown on the block diagram on page 1. Suggested

values of these resistors are shown in the Block

Diagram, but they can be varied to change the

differential pair output swing, and the DC level; refer to

MAN09.

High Frequency Differential PECl Oscillators

The ICS507-01 plus a low frequency, fundamental

mode crystal can build a high frequency differential

output oscillator. For example, a 10 MHz crystal

connected to the ICS507-01 with the 12X output

selected (S1=0, S0=1) produces a 120 MHz PECL

output clock.

Hi Frequency TCXO

Extending the previous application, an inexpensive, low

frequency TCXO can be built and the output frequency

can be multiplied using the ICS507-01. Since the output

of the chip is phase-locked to the input, the ICS507-01

has no temperature dependence, and the temperature

coefficient of the combined system is the same as that

of the low frequency TCXO.

Hi Frequency VCXO

The bandwidth of the PLL is guaranteed to be greater

than 10 kHz. This means that the PLL will track any

modulation on the input with a frequency of less than 10

kHz. By using this property, a low frequency VCXO can

be built, and the output can then be multiplied with the

ICS507-01 to give a high frequency output, thereby

producing a high frequency VCXO.

Absolute Maximum Ratings

Stresses above the ratings listed below can cause permanent damage to the ICS507-01. These ratings,

which are standard values for ICS commercially rated parts, are stress ratings only. Functional operation of

the device at these or any other conditions above those indicated in the operational sections of the

specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can

affect product reliability. Electrical parameters are guaranteed only over the recommended operating

temperature range.

Item

Supply Voltage, VDD

All Inputs and Outputs

Ambient Operating Temperature (commercial)

Ambient Operating Temperature (industrial)

Storage Temperature

Soldering Temperature

Rating

7V

-0.5 V to VDD+0.5 V

0 to +70° C

-40 to +85° C

-65 to +150° C

260° C

IDT™ / ICS™ PECL CLOCK SYNTHESIZER

3

ICS507-01

REV I 041905

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