The MC100EP195B 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. Thedelay section consists of a programmable matrix of gates and multiplexers as shown in the logic diagram, Figure 2. The delay increment of the EP195B has a digitally selectable resolution of about 10 ps and a net range of up to 10.2 ns. The required delay is selected by 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 currentvalues 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 3.

• Maximum Input Clock Frequency >1.2 GHz Typical
• Programmable Range: 0 ns to 10 ns
• Delay Range: 2.2 ns to 12.2 ns
• 10 ps Increments
• PECL Mode Operating Range:VCC = 3.0 V to 3.6 V with VEE = 0 V
• NECL Mode Operating Range:VCC = 0 V with VEE = 3.0 V to 3.6 V
• IN/INb Inputs Accept LVPECL, LVNECL, LVDS Levels
• A Logic High on the EN Pin Will Force Q to Logic Low
• D10:0 Can Select Either LVPECL, LVCMOS, or LVTTL Input Levels
• VBB Output Reference Voltage