
PM5317 SPECTRA-9953 Telecom Standard Product Data Sheet
Release
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2000741, Issue 5
487
17 Operations
The SPECTRA-9953 device is a SONET/SDH Payload Extractor and Aligner. It processes the
section, line, path overhead of an STS-192/192c stream (STM-64/AU4-64c/AU4-16c/AU4-
12c/AU4-8c/ AU4-4c/AU4/AU3/TU3) or quad STS-48/48c (STM-16/AU4-16c/AU4-12c/AU4-
16c/AU4-8c/AU4-4c/AU4/AU3/TU3) streams. The SPECTRA-9953 supports a rich set of line,
path, and system configuration options. This section provides details about operating the device.
17.1 Power Sequencing
The SPECTRA-9953 device uses four separate main power sources: VDDO, VDDI, AVDH, and
AVDL. The device has one main set of analog and digital ground pins: VSS. Moreover, some
analog blocks (CSU, DRU) have their own quiet power and ground pins (AVDH, AVDL, AVSH,
AVSL, QAVD, QAVS).
The analog high power, AVDH, must be connected to a properly de-coupled +3.3 V supply. The
analog low power, AVDL, must be connected to a properly de-coupled +1.8 V supply. The
digital I/O power pins, VDDO, must be connected to a properly de-coupled +3.3 V supply. The
digital core power, VDDI, must be connected to a properly de-coupled +1.8 V supply. The
digital and analog power pins that are of the same supply voltage can be sourced from the same
physical power supply source.
The ground pins can be connected to a common uninterrupted physical ground plane. All analog
and digital power pins are to be de-coupled to the VSS ground. Each analog power pin is to be
independently de-coupled to the ground plane.
The power-on sequence is as follows:
1. The 1.8 V supplies (VDDI, AVDL) can be brought up at the same time or after the 3.3 V
supplies (VDDO, AVDH, CSU_AVDH) as long as the 1.8V supplies never exceed the 3.3V
supplies by more than 0.3V.
2. Analog supplies must not exceed digital supplies of the same nominal voltage by more than
0.3V.
3. Data applied to I/O pins must not exceed VDDO by more than 0.3V unless the data is
current-limited to 20 mA.
4. There are no power-up ramp rate restrictions.
5. The device must be powered down according to the same restrictions above.
1.