10/100/1000 BASE-T SFP Copper Transceiver with SGMII interface BT-SFT-GRJ45 series

Specification

SFP to Host Connector Pin Out

SFP to host connector pin assignments and descriptions

Notes:

• 1. TX Fault is not used and is always tied to ground through a 100 ohm resistor.
• 2. TX Disable as described in the MSA is not applicable to the 1000BASE-T module, but is used for convenience as an input to reset the internal ASIC. This pin is pulled up within the module with a 4.7 KW resistor.
  Low (0 – 0.8 V): Transceiver on Between (0.8 V and 2.0 V): Undefined
  High (2.0 – 3.465 V): Transceiver in reset state Open: Transceiver in reset state
• 3. Mod-Def 0,1,2. These are the module definition pins. They should be pulled up with a 4.7-10 KW resistor on the host board to a supply less than VCCT + 0.3 V or VCCR + 0.3 V.
  Mod Def 0 is tied to ground through a 100 ohm resistor to indicate that the module is present.
  Mod-Def 1 is clock line of two wire serial interface for optional serial ID
  Mod-Def 2 is data line of two wire serial interface for optional serial ID
• 4. LVTTL compatible with a maximum voltage of 2.5V. Not supported on NSF-SFP-T
• 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.

+3.3V Volt Electrical Power Interface

The BT-SFT-GRJ45 has an input voltage range of 3.3 V +/- 5%. The 4 V maximum voltage is not allowed for continuous operation.

Caution: Power consumption and surge current are higher than the specified values in the SFP MSA +3.3 Volt electrical power interface

Low-Speed Signals

MOD_DEF (1) (SCL) and MOD_DEF (2) (SDA), are open drain CMOS signals. Both MOD_ DEF (1) and MOD_DEF (2) must be pulled up to host_Vcc.

Low-speed signals, electronic characteristics

High-Speed Electrical Interface

All high-speed signals are AC-coupled internally.