MC10EP195

MC10EP195, MC100EP195 3.3V ECL Programmable Delay Chip The MC10/100EP195 is a Programmable Delay Chip (PDC) designed primarily for clock deskewing and timing adjustment. It provides variable delay of a differential NECL/PECL input transition. The delay section consists of a programmable matrix of gates and http://onsemi.com multiplexers as shown in the logic diagram, Figure 3. The delay increment of the EP195 has a digitally selectable resolution of about MARKING 10 ps and a net range of up to 10.2 ns. The required delay is selected by DIAGRAM* the 10 data select inputs D[9:0] values and controlled by the LEN (pin 10). A LOW level on LEN allows a transparent LOAD mode of real time delay values by D[9:0]. A LOW to HIGH transition on LEN will LOCK and HOLD current values present against any subsequent changes in D[10:0]. The approximate delay values for varying tap numbers correlating to D0 (LSB) through D9 (MSB) are shown in Table 6 and Figure 4. LQFP−32 FA SUFFIX CASE 873A MCXXX EP195 AWLYYWWG 32 1 Because the EP195 is designed using a chain of multiplexers it has a fixed minimum delay of 2.2 ns. An additional pin D10 is provided for controlling Pins 14 and 15, CASCADE and CASCADE, also latched 1 by LEN, in cascading multiple PDCs for increased programmable range. The cascade logic allows full control of multiple PDCs. Switching devices from all “1” states on D[0:9] with SETMAX LOW to all “0” states on D[0:9] with SETMAX HIGH will increase the delay equiva...