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Renesas Electronics 8A34004 IEEE 15888 System Synchronizer

Renesas Electronics 8A34004 IEEE 15888 System Synchronizer is a Synchronization Management Unit (SMU) for packet-based and physical layer-based equipment synchronization. Part of the Renesas ClockMatrix™ family of multi-channel timing devices, the 8A34004 provides tools to manage timing references, clock sources, and timing paths for IEEE 1588 and Synchronous Ethernet (SyncE) based clocks. The PLL channels can act independently as frequency synthesizers, jitter attenuators, Digitally Controlled Oscillators (DCO), or Digital Phase Lock Loops (DPLL).

The 8A34004 supports multiple independent timing paths that can each be configured as a DPLL or as a DCO. Input-to-input, input-to-output, and output-to-output phase skew can all be precisely managed. The device outputs low-jitter clocks that can directly synchronize interfaces such as 100GBASE-R, 40GBASE-R, 10GBASE-R, 10GBASE-W, and lower-rate Ethernet interfaces, as well as SONET/SDH and PDH interfaces and IEEE 1588 Time Stamp Units (TSUs). 

The internal System APLL must be supplied with a low phase noise reference clock with a frequency between 25MHz and 54MHz. The output of the System APLL is used for clock synthesis by all of the Fractional Output Dividers (FODs) in the device. The System APLL reference can come from an external crystal oscillator connected to the OSCI pin or from an internal oscillator that uses a crystal connected between the OSCI and OSCO pins.

The Renesas Electronics 8A34004 SMU is offered in a 7mm x 7mm VFQFPN (Very Fine-Pitch Quad Flat Pack No-Lead) package with an exposed pad for enhanced thermal performance.

Features

  • Two independent timing channels
    • Each can act as a frequency synthesizer, jitter attenuator, Digitally Controlled Oscillator (DCO), or Digital Phase Lock Loop (DPLL)
    • DPLLs generate telecom compliant clocks
      • Compliant with ITU-T 8262 for Synchronous Ethernet
      • Compliant with legacy SONET/SDH and PDH requirements
    • DPLL Digital Loop Filters (DLFs) are programmable with cut off frequencies from 12µHz to 22kHz
    • DPLL/DCO channels share frequency information using the Combo Bus to simplify compliance with ITU-T 8273.2
    • Switching between DPLL and DCO modes is hitless and dynamic
      • Automatic reference switching between DCO and DPLL modes to simplify support for an external phase/time input interface in a T-BC
    • Generates output frequencies that are independent of input frequencies via a Fractional Output Divider (FOD)
    • Each FOD supports output phase tuning with 1ps resolution
  • 4 Differential / 8 LVCMOS outputs
    • Frequencies from 5Hz to 1GHz (250MHz for LVCMOS)
    • Jitter below 150fs RMS (10kHz to 20MHz)
    • LVCMOS, LVDS, LVPECL, HCSL, CML, SSTL, and HSTL output modes supported
    • Differential output swing is selectable: 400mV / 650mV / 800mV / 910mV
    • Independent output voltages of 3V, 2.5V, or 1.8V
    • LVCMOS additionally supports 5V or 1.2V
    • The clock phase of each output is individually programmable in 1ns to 2ns steps with a total range of ±180°
  • 2 differential / 4 single-ended clock inputs
    • Supports frequencies from 5Hz to 1GHz
    • Any input can be mapped to any or all of the timing channels
    • Redundant inputs frequency independent of each other
    • Any input can be designated as external frame/sync pulse of EPPS (even pulse per second), 1PPS (Pulse per Second), 5PPS, 10PPS, 50Hz, 100Hz, 1kHz, 2kHz, 4kHz, and 8kHz associated with a selectable reference clock input
    • Per-input programmable phase offset of up to ±1.638ms in 1ps steps
  • Reference monitors qualify/disqualify references depending on LOS, activity, frequency monitoring, and/or LOS input pins
    • Loss of Signal (LOS) input pins (via GPIOs) can be assigned to any input clock reference
  • Automatic reference selection state machines select the active reference for each DPLL based on the reference monitors, priority tables, revertive / non-revertive, and other programmable settings
  • System APLL operates from fundamental-mode crystal: 25MHz to 54MHz or from a crystal oscillator
  • System DPLL accepts an XO, TCXO, or OCXO operating at virtually any frequency from 1MHz to 150MHz
  • DPLLs can be configured as DCOs to synthesize Precision Time Protocol (PTP) / IEEE 1588 clocks
    • DCOs generate PTP based clocks with frequency resolution less than 11 × 10-16
  • DPLL Phase detectors can be used as Time-to-Digital Converters (TDC) with precision below 1ps
  • Supports 1MHz I2C or 50MHz SPI serial processor ports
  • The device can configure itself automatically after reset via:
    • Internal customer definable One-Time Programmable memory with up to 16 different configurations
    • Standard external I2C EPROM via separate I2C Master Port
  • 1 JTAG Boundary Scan
  • -40°C to +85°C operating temperature range
  • 7mm x 7mm VFQFPN48 package

Applications

  • Core and access IP switches and routers
  • Synchronous Ethernet equipment
  • Telecom Boundary Clocks (T-BCs) and Telecom Time Slave Clocks (T-TSCs) according to ITU-T 8273.2
  • 10Gb, 40Gb, and 100Gb Ethernet interfaces
  • Central Office Timing Source and Distribution
  • Wireless infrastructure for 5G and 5G network equipment

Documents

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Block Diagram

Block Diagram - Renesas Electronics 8A34004 IEEE 15888 System Synchronizer

Package Outline

Mechanical Drawing - Renesas Electronics 8A34004 IEEE 15888 System Synchronizer
發佈日期: 2021-06-14 | 更新日期: 2022-03-11