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Saturday, August 19, 2017
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Clock Reference Boardspecs

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 first 3.3 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
PC133/100 Clock Reference Board General Specifications
Frequency
100 Mhz and 133Mhz Operation
Support
PC100 / PC133 SDRAM DIMM Module (Registered)
Connector
168pin Standard DIMM connector
Power Supply Option
3.3Volts: VDD for frequency synthesizer and buffer chips
3.3Volts: VDD for DIMM socket (or tie directly to first 3.3 Volt supply)
2.5Volts: VDDQ for frequency synthesizer
Three Clock Reference Nets
168 Pin PC100 Unbuffered DIMM clock net
168 Pin PC100/PC133 Registered DIMM clock net
Clock buffer standard test load
168 Pin standard DIMM connector
4 clocks wired (supports Registered or Unbuffered DIMMs)
CKE, CS pins tied inactive, other 'registered' DIMM inputs tied low
Selectable Modes
Clocks on/off
Spread spectrum enable/disable
100MHz/133MHz frequency selection
Physical
Card Size: 7.9" x 3.725" x .05"
Coupons for measuring board impedance
Associated Test Equipment Required
Bench triple outlet power supply or 3 seperated power supply for : 3.3Vdc, 3.3Vdc, 2.5Vdc
High Frequency Digital Oscilloscope:
- 1Ghz bandwidth minimum
- 2 each high impedance scope probes (0.5-1pf)
CST Inc. Memory Tester DDR Tester
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