PMC-Sierra PM5349 manual 5V tolerant I/O’s, Trstb, Tck, Tms, Tdi, Tdo

Models: PM5349

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PMC-Sierra, Inc.

S/UNI-QUAD

DATASHEET

PM5349 S/UNI-QUAD

PMC-971239

ISSUE 6

SATURN USER NETWORK INTERFACE (155-QUAD)

 

 

 

Power supply filtering recommendations are provided in the

OPERATION section of this document.

6.Due to ESD protection structures in the pads it is necessary to exercise caution when powering a device up or down. ESD protection devices behave as diodes between power supply pins and from I/O pins to power supply pins. Under extreme conditions it is possible to blow these ESD protection devices or trigger latch up. Please adhere to the recommended power supply sequencing as described in the OPERATION section of this document.

7.If it is intended to substitute a S/UNI-QUAD in a S/UNI-TETRA socket, special attention must be given to the NC pins. The requirement is that no S/UNI-QUAD input pin is left floating when used in a S/UNI-QUAD socket. Please refer to the relevant PMC-Sierra, Inc. application note.

8.Some device pins can be made 5V tolerant by connecting the BIAS pins to a 5V power supply, while some other pins are 3.3V only. In summary, the system interface is 3.3V only while the microprocessor interface, SONET and line interfaces can be 5V tolerant.

3.3V only I/O’s:

RDAT[15:0], RSOC, RPRTY, RENB,

TDAT[15:0], TSOC, TPRTY, TENB,

RCA, DRCA4-1, TCA, DTCA4-1,

RADR[5:0], TADR[5:0], PHY_OEN

5V tolerant I/O’s:

REFCLK, RXD

RCLK4-1, RFPO4-1, RALRM4-1,

TCLK, TFPO, TFPI,

D[7:0], A[10:0], WRB, RDB, CSB, RSTB, INTB, ALE,

TRSTB, TCK, TMS, TDI, TDO,

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use

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PMC-Sierra PM5349 manual 5V tolerant I/O’s, Trstb, Tck, Tms, Tdi, Tdo