3

COMMERCIALTEMPERATURERANGE

IDT23S08T

2.5V ZERO DELAY CLOCK MULTIPLIER

S2

S1

CLK A

CLK B

Output Source

PLL Shut Down

L

L

Tri-State

Tri-State

PLL

Y

L

H

Driven

Tri-State

PLL

N

H

L

Driven

Driven

REF

Y

H

H

Driven

Driven

PLL

N

NOTE:

1. H = HIGH Voltage Level

L = LOW Voltage Level

SPREAD SPECTRUM COMPATIBLE

Many systems being designed now use a technology called Spread Spectrum Frequency Timing Generation. This product is designed not to filter

off the Spread Spectrum feature of the reference input, assuming it exists. When a zero delay buffer is not designed to pass the Spread Spectrum feature

through, the result is a significant amount of tracking skew, which may cause problems in systems requiring synchronization.

Device

FeedbackFrom

Bank A Frequency

Bank B Frequency

IDT23S08T-1

Bank A or Bank B

Reference

Reference

Bank A

Reference

Reference/2

Bank B

2 x Reference

Reference

Bank A

2 x Reference

Bank B

4 x Reference

2 x Reference

Bank A or Bank B

2 x Reference

2 x Reference

Bank A or Bank B

Reference/2

Reference/2

NOTES:

1. Contact factory for availability.

2. Output phase is indeterminant (0° or 180° from input clock).

AVAILABLE OPTIONS FOR IDT23S08T

ZERO DELAY AND SKEW CONTROL

To close the feedback loop of the IDT23S08T, the FBK pin can be driven from any of the eight available output pins. The output driving the FBK pin

will be driving a total load of 7pF plus any additional load that it drives. The relative loading of this output (with respect to the remaining outputs) can adjust

the input-output delay.

For applications requiring zero input-output delay, all outputs including the one providing feedback should be equally loaded. Ensure the outputs are

loaded equally, for zero output-output skew.

NOTE:

1. Applies to both REF and FBK.

Symbol

Parameter

Test Conditions

Min.

Max.

Unit

SupplyVoltage

2.3

2.7

V

OperatingTemperature(AmbientTemperature)

0

70

Load Capacitance from 10MHz to 133MHz

—

15

pF

—7

pF

OPERATING CONDITIONS