Microchip SY89873LMG

This 3.3V low-skew, low-jitter, precision LVDS output clock divider accepts any high-speed differential clock input (AC- or DC-coupled) CML, LVPECL, HSTL or LVDS and divides down the frequency using a programmable divider ratio to create a frequency-locked, lower speed version of the input clock. The SY89873L includes two output banks. Bank A is an exact copy of the input clock (pass through) with matched propagation delay to Bank B, the divided output bank. Available divider ratios are 2, 4, 8 and 16. In a typical 622MHz clock system this would provide availability of 311MHz, 155MHz, 77MHz or 38MHz auxiliary clock components.

The differential input buffer has a unique internal termination design that allows access to the termination network through a VT pin. This feature allows the device to easily interface to all AC- or DC-coupled differential logic standards. A VREF-AC reference is included for AC-coupled applications.The SY89873L is part of Micrel's high-speed Precision Edge® timing and distribution family. For 2.5V applications, consider the SY89872U. For applications that require an LVPECL output, consider the SY89871U.The /RESET input asynchronously resets the divider outputs (Bank B). In the pass-through function (Bank A) the /RESET synchronously enables or disables the outputs on the next falling edge of IN (rising edge of /N). Refer to the Timing Diagram.

• >2.0GHz fMAX output toggle
• >3.0GHz fMAX input
• <800ps tPD (matched-delay between banks)
• <15ps within-device skew
• <190ps rise/fall time
• <1psRMS cycle-to-cycle jitter
• Unique input termination and VTpin for DC-coupled and AC-coupled inputs: any differential inputs (LVPECL, LVDS, CML, HSTL)
• Precision differential LVDS outputs
• Matched delay: all outputs have matched delay, independent of divider setting
• TTL/CMOS inputs for select and reset/disable
• Bank A: Buffered copy of input clock (undivided)
• Bank B: Divided output (÷2, ÷4, ÷8, ÷16), two copies
• 3.3V power supply
• Wide operating temperature range: -40°C to +85°C
• Available in 16-pin (3mm x 3mm) QFN package