SY10E195

Micrel, Inc. NOT RECOMMENDED FOR NEW DESIGNS PROGRAMMABLE DELAY CHIP Precison Edge® Precison SESYdY1g1000eEE®119955 SY10E195 SY100E195 FEATURES s Up to 2ns delay range s Extended 100E VEE range of –4.2V to –5.5V s ≈20ps/digital step resolution s >1GHz bandwidth s On-chip cascade circuitry s 75KkΩ input pulldown resistor s Fully compatible with Motorola MC10E/100E195 s Available in 28-pin PLCC package DESCRIPTION The SY10/100E195 are programmable delay chips (PDCs) designed primarily for clock de-skewing and timing adjustment. They provide variable delay of a differential ECL input transition. The delay section consists of a chain of gates organized as shown in the logic diagram. The first two delay elements feature gates that have been modified to have delays 1.25 and 1.5 times the basic gate delay of approximately 80ps. These two elements provide the E195 with a digitally-selectable resolution of approximately 20ps. The required device delay is selected by the seven address inputs D[0:6], which are latched on-chip by a high signal on the latch enable (LEN) control. If the LEN signal is either LOW or left floating, then the latch is transparent. Because the delay programmability of the E195 is achieved by purely differential ECL gate delays, the device will operate at frequencies of >1GHz, while maintaining over 600mV of output swing. The E195 thus offers very fine resolution, at very high frequencies, selectable entirely from a digital input, allowing for very accurate s...