News and New Products

Line terminator says “hasta la vista” to reflections

By Bill Schweber -- EDN, 9/8/2005

Squeezing an array of Schottky diodes into a single package, the QDN001/02/03 Series of diode protection networks from TT electronics IRC provides line termination and ESD protection. According to Debasis Roy, PhD, director of IRC’s Advanced Film Division Thin Film Business Unit, the devices require no impedance matching, because they terminate load impedances and clamp high- and low-state reflections and noise. The terminators target use with high-speed data lines, especially PCI and SDRAM buses, and reduce overshoot and undershoot with near-zero power dissipation.

The QDN001 includes 36 diodes, with clamping current of ±50 mA, and operating voltage of –0.3 to +7V, with diode forward voltage drop of 0.5 V at 10 mA to 0.8V at 50 mA. The QDN002 series incorporates 17 diodes for ESD protection, with a 15-kV rating (human-body model) and 8-kV ESD contact protection; the QDN003 has 18 Schottky diodes and similar ratings.

TT electronics IRC, www.irctt.com.