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PI6C399111J Datasheet(PDF) 7 Page - Pericom Semiconductor Corporation |
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PI6C399111J Datasheet(HTML) 7 Page - Pericom Semiconductor Corporation |
7 / 11 page 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 PI6C39911 3.3V High Speed LVTTL or Balanced Output Programmable Skew Clock Buffer - SuperClock 7 PS8497E 09/13/02 Operational Mode Descriptions Figure 2. Zero-Skew and/or Zero-Delay Clock Driver Figure 2 shows the SUPERCLOCK configured as a zero-skew clock buffer. In this mode the PI6C39911 can be used as the basis for a low- skew clock distribution tree. When all of the function select inputs (xF0, xF1) are left open, the outputs are aligned and may each drive a terminated transmission line to an independent load. The FB input FB REF FS 4F0 4F1 3F0 3F1 2F0 2F1 1F0 1F1 TEST 4Q0 4Q1 3Q0 3Q1 2Q0 2Q1 1Q0 1Q1 System Clock REF LOAD LOAD LOAD LOAD L1 L2 L3 L4 Z0 Z0 Z0 Z0 LENGTH: L1 = L2 = L3 = L4 FB REF FS 4F0 4F1 3F0 3F1 2F0 2F1 1F0 1F1 TEST 4Q0 4Q1 3Q0 3Q1 2Q0 2Q1 1Q0 1Q1 System Clock REF LOAD LOAD LOAD LOAD L1 L2 L3 L4 Z0 Z0 Z0 Z0 LENGTH: L1 = L2, L3 < L2 by 6", L4 > L2 by 6" Figure 3. Programmable Skew Clock Driver can be tied to any output in this configuration and the operating frequency range is selected with the FS pin. The low-skew specifi- cation, coupled with the ability to drive terminated transmission lines (with impedances as low as 50 ohms), allows efficient printed circuit board design. |
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