Semtech ACS8525A
LC/P Line Card Protection Switch for SONET/SDH Systems
The ACS8525A is a highly integrated, single-chip solution for “Hit-less” protection switching of SEC (SDH/SONET Equipment Clock) + Sync clock “Groups”, from Master and Slave SETS clock cards and a third (Stand-by) source, for Line Cards in a SONET or SDH Network Element.
Features
- SONET/SDH applications up to OC-3/STM-1 bit rate.
- Switches between grouped inputs (SEC/Sync pairs).
- Inputs: three SECs at any of 2, 4, 8 kHz (and N x 8 kHz multiples up to 155.52 MHz), plus Frame Sync/Multi-Frame Sync.
- Outputs: two SEC clocks at any of several spot frequencies from 2 kHz up to 77.76 MHz via the TTL/CMOS port and up to 311.04 MHz via the PECL/LVDS port.
- Selectable clock I/O port technologies.
- Modes for E3/DS3 and multiple E1/DS1 rate output clocks.
- Frequency translation of SEC input clock to a different local line card clock.
- Robust input clock source activity monitoring on all inputs.
- Supports Free-run, Locked and Digital Holdover modes of operation.
- Automatic “Hit-less” source switchover on loss of input.
- External force fast switch between SEC1/SEC2 inputs.
- Phase Build-out for output clock phase continuity during input switchover.
- PLL “Locked” and “Acquisition” bandwidths individually selectable from 18, 35 or 70 Hz.
- Serial interface for device set-up.
- Single 3.3 V operation.
- Operating temperature (ambient) of 0 to +70°C.
- Available in LQFP 64 package.
- Lead (Pb)-free version available (ACS8525T), RoHS and WEEE compliant.
Order Codes
- ACS8525 A: NCNR, 160 per tray, ok to order partial tray quantities
- ACS8525AT: Lead-free, RoHS and WEEE compliant, NCNR, 160 per tray, ok to order partial tray quantities
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