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Ref: ATGBICS_I-MGBIC-GTX-C_V1

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Product Datasheet

5. RD-/+: These are the differential receiver outputs. They are ac coupled 100-ohm differential lines which

should be terminated with 100-ohm differential at the user SerDes. The ac coupling is done inside the

module and is thus not required on the host board. The voltage swing on these lines will be between 370

and 2000 mV differential (185 – 1000 mV single ended) when properly terminated. These levels are

compatible with CML and LVPECL voltage swings.

6. VCCR and VCCT are the receiver and transmitter power supplies. They are defined as 3.3 V ± 5% at the

SFP connector pin. The maximum supply current is about 300mA, and the associated in-rush current will

typically be no more than 30 mA above steady state after 500 nanoseconds.

7. TD-/+: These are the differential transmitter inputs. They are ac coupled differential lines with 100 W

differential termination inside the module. The ac coupling is done inside the module and is thus not

required on the host board. The inputs will accept differential swings of 500 – 2400 mV (250 –1200 mV

single ended), though it is recommended that values between 500 and 1200 mV differential (250 – 600 mV

single ended) be used for best EMI performance. These levels are compatible with CML and LVPECL

voltage swings.

Figure 1. Diagram of host board connector block pin numbers and names