STM1E-SFPxx 155Mbps Copper Transceiver

Final Datasheet

STM1E-SFPxx Datasheet

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August 2008 v2-2

Serial ID Interface

The STM1E-SFPxx supports the 2-wire serial EEPROM protocol for the ATMEL AT24C01 as defined by the MSA.

The serial interface provides access to identification information. The memory is organized as byte wide data

words that can be addresses individually or sequentially at device address 1010000X (A0h).

Special Design Considerations for Using STM1E-SFPxx Transceivers

Host enclosures that use SFP devices should provide appropriate clearances between the SFP transceivers to

allow room for the larger width of the 1.0/2.3 mini-coax front end. For most systems a nominal centerline-to-

centerline spacing of 16.25mm (0.640”) is sufficient, but preferred coax cable types and routing clearances may

require additional spacing.

NOTE: To accommodate the preferred Type D coax coupling and cable types, the width of the nosepiece

or front end was designed to exceed the MSA requirements of 13.7mm (+/- 0.1).

o

Reference INF-8074 [Appendix A, Table 1, Designator A] for MSA recommendations

o

Reference Mechanical Drawings section for STM1E-SFPxx transceiver dimensions.

The SFP transceiver insertion slot should be clear of nearby moldings and covers that might block convenient

access to the unique latching mechanism used in the STM1E-SFPxx. A bail-style de-latch was not feasible with a

coaxial network interface so a simple push button actuator was employed. Detaching the coax cable from the

STM1E-SFPxx is not required for de-latching the transceiver from the host card.

NOTES:

1. In order to secure the larger push button de-latch mechanism, the length of the bottom of the

transceiver exceeds the maximum MSA requirements of 2.0mm.

o

Reference INF-8074 [Appendix A, Table 1, Designator Y] for MSA recommendations

o

Reference Mechanical Drawings section for STM1E-SFPxx transceiver dimensions.

2. Note: Double-sided board mounting is generally not recommended due to the limited clearance

for de-latching the STM1E-SFPxx transceiver.