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DDR Clock Reference Board General Specifications

Frequency

100 mhz , 133mhz

Data Rate

200mhz , 266mhz

Support

PC1600 and PC 2100 DDR module
(Registered and Unbuffered)

Connector

184 pin Standard DIMM connector

Power Supply Options

3.3Volts: VDD for frequency synthesizer and buffer chips
3.3Volts: VDD for DIMM socket
(or tie directly to first3.3 Volt supply)
2.5Volts: VDDQ for frequency synthesize

Two Clock Reference Nets

184 pin DDR Unbuffered DIMM Clock net
184 Pin DDR Registered DIMM Clock net

Selectable Modes

Clocks On/Off
Spread Spectrum Enable / Disable
100 Mhz / 133 Mhz Frequency Selection
PLL On / Off

Card Size

7.9" x 3.725 x 0.05

Associated Test Equipment Required for DDR Clock Ref Board

2 Power Supplies

3.3 Volts (use 2 single or 1 dual power supply)
2.5 Volts

Oscilloscope recommended characteristics

Sampling Rate (real time) - Minimum of 4 Gsamples/second
RMS Jitter - < 6ps +/- 0.05% of delay setting

Probes recommended characteristics

Rise time -<140ps
Bandwidth (-3dB) > 2.5GHz
Input Resistance - 100k
Input Capacitance - 0.6pF

Clock Reference Board

MOH-003-10

DDR Clock Reference Board 266/333 MHz

MOH-004-10

DDR II Clock Reference Board (533/400 MHz)