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NB2309A

Zero Delay Clock Buffer

ON Semiconductor 

NB2309A

Zero Delay and Skew Control

All outputs should be uniformly loaded to achieve Zero

Delay between input and output. Since the CLKOUT pin is

the internal feedback to the PLL, its relative loading can

adjust the input−output delay.

For applications requiring zero input−output delay, all

outputs, including CLKOUT, must be equally loaded. Even

if CLKOUT is not used, it must have a capacitive load equal

to that on other outputs, for obtaining zero−input−output

delay.

SWITCHING WAVEFORMS

1.4 V

t1

t2

1.4 V

1.4 V

Figure 3. Duty Cycle Timing

OUTPUT

2.0 V

0.8 V

t3

2.0 V

0.8 V

t4

3.3 V

0V

Figure 4. All Outputs Rise/Fall Time

OUTPUT

OUTPUT

1.4 V

t5

1.4 V

Figure 5. Output − Output Skew

VDD

2

INPUT

VDD

OUTPUT

2

t6

Figure 6. Input − Output Propagation Delay

CLKOUT, Device 1

CLKOUT, Device 2

VDD

2

t7

VDD

2

Figure 7. Device − Device Skew

VDD

CLKOUT

0.1 mF

OUTPUTS

CLOAD

VDD

0.1 mF GND GND

TEST CIRCUITS

VDD

0.1 mF

OUTPUTS

VDD

0.1 mF GND GND

VDD

1 kW

1 kW

10 pF

Figure 8. Test Circuit #1

Figure 9. Test Circuit #2

For parameter t8 (output slew rate) on −1H devices

http://onsemi.com

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