General Description

The 8T49N012 is a high performance Clock Generator with

selectable LVPECL or Single-ended outputs. The 8T49N012 can

generate selectable frequencies from a crystal or a single-ended

reference clock. The frequency is selected from the Frequency

Selection Table.

Excellent phase noise performance is maintained with IDT’s Fourth

Generation FemtoClock? NG PLL technology

特性 Features

? Fourth Generation FemtoClock NG PLL technology

? Three differential output banks:

Bank A: selectable between four pairs of LVPECL or four pairs

of complementary LVCMOS/LVTTL outputs

Bank B: two pairs of LVPECL outputs

Bank C: six pairs of LVPECL outputs

? Selectable clock input or crystal input.

? Supports 25MHz fundamental crystal or 25MHz, 50MHz,

66.67MHz clock input

? Selectable 156.25MHz, 125MHz, 100MHz clock for Bank B and

Bank C outputs

? Selectable 156.25MHz, 125MHz, 100MHz, 250MHz, 312.5MHz,

50MHz, 25MHz, 62.5MHz or 78.125MHz for Bank A outputs

? PLL lock indication (LVCMOS output)

? RMS phase jitter at 156.25MHz (12kHz - 20MHz): 0.199ps (typical)

? Power supply modes:

Core / Output

3.3V / 3.3V

3.3V / 2.5V

2.5V / 2.5V

? -40°C to 85°C ambient operating temperature

? 56-Lead VFQFN

? Lead-free (RoHS 6) packaging