CDC706PW datasheet(28/41 Pages) TI

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5x6 − Switch A

Input CLK

(PLL Bypass)

PLL 1

PLL 2

non SSC

PLL 2

w/ SSC

PLL 3

6x6 − Switch B

7-Bit Divider

Output Switch Matrix

(1..127)

Programming

Outputs

Internal Clock Sources

PLL/Input_Clk

Selection

P-Divider

Selection

Output Selection:

Active/Low/3-State/

Inverting/Non-Inverting

P-Divider

Setting

(1..127)

Slew Rate/VCCOUT

LVCMOS Output Configuration

Inverting

Slew Rate

Low Select

Enable/Disable

Clock

div by 3

Buffer

Sel

P−div(0) output

P−div(1) output

P−div(2) output

P−div(3) output

P−div(4) output

P−div(5) output

Inversion Select

Slew-Rate Control

Low Select

Enable/Disable

P−Divider Select

(Optional all

outputs low

or 3−State)

VCCOUT1/VCCOUT2

CDC706

SCAS829A – SEPTEMBER 2006 – REVISED MARCH 2007

Figure 23. CDC706 Output Switch Matrix

In addition, the outputs can be switched active, low or 3-state and/or 180 degree phase shifted. Also the outputs

slew-rate and the output-voltage is user selectable.

The output stage of the CDC706 supports all common output setting, such as enable, disable, low-state and

signal inversion (180 degree phase shift). It further features slew-rate control (0.6 ns to 3.3 ns) and variable

output supply voltage (2.3 V to 3.6 V).

Figure 24. Block Diagram of Output Architecture

Figure 25. Example for Output Waveforms

All output settings are programmable via SMBus:

• enable, disable, low-state via external control pins S0 and S1 → Byte 10, Bit[3:0]

• enable or disable-to-low → Byte 19 to 24, Bit[3]

• inverting/non-inverting → Byte 19 to 24, Bit[6]

• slew-rate control → Byte 19 to 24, Bit[5:4]

• output swing → external pins V

CCOUT1 (Pin 14) and VCCOUT2 (Pin 18)

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