1999-11-15 , S/IC-2052/24
Product News From Philips Semiconductors

A full range of high performance PLL clock drivers and registered drivers facilitate transition to PC133

Philips Semiconductors today announced the availability of one family of Phase Lock Loop (PLL) clock drivers and two families of registered drivers to support PC133 Dual In-Line Memory Modules (DIMMs) for high-end desktops, workstations and servers. These high-performance solutions will ease the transition to PC133 registered DIMMs. The  PCK2509S and PCK2510S PLL clock drivers and AVC and AVCM families of registered drivers are optimized to work together and provide a complete memory interface solution for PC133 registered DIMMs. Typically a registered DIMM includes one PLL clock driver and one to three registers, in addition to several Synchronous Dynamic Random Access Memory (SDRAM) chips.

"Philips Semiconductors now provides a complete range of high-performance memory interface solutions to support PC133 registered DIMMs," said Pierre-Yves Lesaicherre, international product marketing manager for Philips Semiconductors' PC Motherboard ICs. "Our new devices will allow an easy transition to the registered PC133 industry standard, and complement our existing memory interface products for PC100 and first generation double data rate (DDR). Philips Semiconductors now has the broadest memory interface portfolio in the industry and is committed to providing advanced solutions for future memory module standards."

Philips Semiconductors' PCK2509S and PCK2510S devices are optimized for use in both PC100 and PC133 registered memory modules and provide frequencies up to 167 MHz with zero delay feedback to the system's DIMMs. The key performance characteristics of these PLL clock drivers are low pin-to-pin skews (less than 150 ps), low cycle-to-cycle jitter (less than 50 ps), low phase error (less than 100 ps) and a low input capacitance (4 pF). These devices are usually mounted directly on the DIMMs to provide synchronized signals to the SDRAM. In addition, they can be mounted directly onto motherboards to support other high-speed applications up to 167 MHz. The PCK2509S and PCK2510S feature a single-ended PLL integrated with a clock buffer and an efficient power management mode, all in a space-saving TSSOP 24 pin package.

Philips Semiconductors' AVCM and AVC families of registered drivers include all four of the functions (16334, 16834, 16835 and 16836) used in registered DIMMs. These registers are designed to drive address and control signals to PC133 Single Data Rate (SDR) SDRAMs that are mounted on DIMMs. The AVCM register family consists of two 18-bit registered drivers, the  74AVCM162835 (active high latch enable) and  74AVCM162834 (active low latch enable) and a 20-bit registered driver, the  74AVCM162836. These devices feature 15 Ohms series termination resistors on the output to reduce undershoot and overshoot during high-speed signal transitions.

The AVC register family consists of a 16-bit registered driver, the 74AVC16334, two 18-bit registered drivers, the 74AVC16835 (active high latch enable) and 74AVC16834 (active low latch enable), and a 20-bit registered driver, the 74AVC16836. The AVC family incorporates innovative Dynamically Controlled Output (DCO™) circuitry to reduce overshoot and undershoot without compromising the speed of the device, eliminating the need for termination resistors. In addition, these devices include input clamping diodes to reduce input overshoot, undershoot and ringback.

All AVC and AVCM registers exhibit typical propagation delays, less than 1.7 ns at 3.3 V, a critical parameter to meet the strict timing budget associated with a 133 MHz operation. The registers are offered in space-saving TSSOP 48 pin (16334 function) and TSSOP 56 pin (16834, 16835 and 16836 functions) packages.

The PCK2509S and PCK2510S are currently sampling, and the PCK2509S is available in volume production. Volume production will begin for the PCK2510S in early December.

The AVCM and AVC families are currently sampling, and the AVCM devices are available in volume production. Volume production will begin for the AVC devices in December.

Datasheets, IBIS models and additional information on Philips Semiconductors' memory interface products can be found at  www.philipslogic.com/pc.

Philips Semiconductors, a division of Royal Philips Electronics, headquartered in Eindhoven, The Netherlands, is the eighth largest semiconductor supplier based on Dataquest's 1998 report*). Philips Semiconductors' innovations in digital audio, video, and mobile technology position the company as a leader in the consumer, multimedia and wireless communications markets. Sales offices are located in all major markets around the world and are supported by systems labs. Additional information on Philips Semiconductors can be obtained by accessing its home page at http://www.semiconductors.philips.com

* Based on Vendor Revenue from Shipments of Total Semiconductors Worldwide according to Dataquest's 1998 Worldwide Semiconductor Market Share report published in May, 1999.