ACS9521
ACS9521
There are many applications in which it is necessary to lock a remote clock signal to a central frequency source, and there are other applications which require the alignment of a clock to a central source of time. The ACS9521 uses DPSync packet timing technology to support both applications.
DPSync technology combines the IEEE 1588 v2 protocol with DAPU's patented packet delay filtering algorithms, which allow a reference clock to be transported across a packet switched network without special adaptations of switches or routers in the network. It is ideal for carrying timing across a legacy packet switched network. IEEE 1588 is often known as precision time protocol (PTP).
Device features
Fully integrated - integrates hardware precision timestamping with on-the-fly insertion. Powerful integrated processor and clock recovery algorithm for PTP.
Timing synchronization on a chip - supporting transitions from legacy circuit networks to new packet technology.
Suitable applications - Stratum 3, 3E, 4E, 4, SONET Minimum Clock (SMC) or SONET/SDH Equipment Clock(SEC) or Ethernet, IEEE1588 PTP, Synchronous Ethernet, Ethernet Equipment Clock.
Clocks - 18 clock inputs and 11 clock outputs.
Precision holdover - in all modes.
Ports - 2 x SGMII, serial interface and JTAG.
Time-of-day - PPnS top-of-second signal plus current-time-since-epoch message on a UART.
Output characteristics:
Time-aligned output:
1 PPS and 125 MHz divided by n (n = 4 to 125000).
Frequency-aligned outputs:
1 Hz and programmable frequency 1 kHz to 62.5 MHz.
Low jitter frequency-aligned outputs:
SONET and SDH OC-n rates: 3.84 MHz to 155.52 MHz.
SyncE rates: 25 MHz, 50 MHz, 62.5 MHz and 125 MHz.
Local oscillator: ±20 ppm or better.
LBGA package: 324 pin, 19 mm x 19 mm.
Lead-free - RoHS and WEEE compliant.
External RAM not required.
Application
