Industry's First 1:4 LVPECL & LVDS Fanout Buffers with Internal Termination Accept Any Differential Input

Highest throughput: more than  2GHz
Lowest jitter: less than 1ps pk-pk
Lowest skew: less than 20ps
Smallest package: 16-pin (3mm x 3mm)
MicroLead Frame™ (MLF) package

Four new high-speed, LVPECL and LVDS clock fanout buffers for the ultra-low jitter and skew requirements of SONET/SDH communications systems, high-end enterprise server applications, and ATE systems have been developed by Micrel Semiconductor (NASDAQ: MCRL), an industry leader in the design and manufacture of integrated circuits for the high-speed communications, analog and power management markets.

The latest additions to Micrel’s Precision Edgeª Timing & Distribution family, the SY89831, SY89832/3, and SY89834 are high-speed, precision LVPECL and LVDS 1:4 fanout buffers. The devices are designed with a unique input stage that includes internal termination and the ability to accept any differential input source, whether the input signal is AC-coupled or DC-coupled. No external components are required in the signal path. Stubs associated with external termination networks are eliminated, thus preserving signal integrity.

The SY89831U operates from a 2.5V or 3.3V supply and is optimized for applications that require up to four precision LVPECL outputs. Skew within the device is guaranteed to be less than 20ps, and rise-and-fall times are less than 225ps. The SY89834 is optimized for applications that require LVPECL outputs from a single-ended LVTTL/CMOS source. For applications that require LVDS outputs, the SY89832 operates from a 2.5V supply, and the SY89833 operates from a 3.3V supply. Unlike other LVDS buffers, the SY89832/3 feature rise and fall times as low as 190ps–the fastest edge rates in the industry.

The SY89831 family is optimized for all communications applications, including all SONET/SDH, Gigabit Ethernet, and Fiber Channel clock trees. Designed for communications applications, the family features a total jitter (the amount of peak-to-peak jitter measured over 1012 clock cycles) of less than 1ps over the device’s full temperature and voltage ranges. In addition, the SY8983x family are offered in a 16-pin (3mm x 3mm) package, which represents a 70% reduction in footprint area compared to alternative solutions.

The SY89831U, SY89832U, SY89833L, and SY89834U 1:4 fanout buffers are now in full production. Pricing starts at $3.99 (1,000-piece suggested resale, FOB USA). The devices are manufactured in a small (3mm x 3mm) 16-pin MLF package and guaranteed over the —40° C to +85° C industrial temperature range.

Micrel Semiconductor is a leading manufacturer of advanced, precision edge timing and distribution, Ethernet switch and physical layer transceiver, mixed signal, analog and power IC solutions. These products include devices for fiber-optic telecommunications and networking, cellular telephones, servers, portable computer systems, computer peripherals, process control systems, consumer electronics and power supplies.