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SY54023ARMG

Low Voltage 1.2V/1.8V CML 2x2 Crosspoint Switch 3.2Gbps, 3.2GHz

Micrel 

Micrel, Inc.

Interface Applications

For Input Interface Applications, see Figures 4a

through 4f and for CML Output Termination, see

Figure 5a through Figure 5d.

CML Output Termination with VCCO 1.2V

For VCCO of 1.2V, Figure 5a, terminate the output

with 50Ω-to-1.2V, DC coupled, not 100Ω differentially

across the outputs.

If AC-coupling is used, Figure 5d, terminate into 50Ω-

to-1.2V before the coupling capacitor and then

connect to a high value resistor to a reference

voltage.

Do not AC couple with internally terminated receiver.

For example, 50Ω ANY-IN input. AC-coupling will

offset the output voltage by 200mV and this offset

voltage will be too low for proper driver operation. Any

unused output pair needs to be terminated when

VCCO is 1.2V, do not leave floating.

SY54023AR

CML Output Termination with VCCO 1.8V

For VCCO of 1.8V, Figure 5a and Figure 5b,

terminate with either 50Ω-to-1.8V or 100Ω

differentially across the outputs. AC- or DC-coupling

is fine.

Input AC Coupling

The SY54023AR input can accept AC-coupling from

any driver. Bypass VT with a 0.1µF low ESR capacitor

to VCC as shown in Figures 4c and 4d. VT has an

internal high impedance resistor divider as shown in

Figure 2a, to provide a bias voltage for AC-coupling.

Timing Diagrams

June 2008

Figure 1a. Propagation Delay

7

M9999-062608-A

hbwhelp@micrel.com or (408) 955-1690

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