ASM5I9351

The ASM5I9351 is a low voltage high performance 200MHz PLL-based zero delay buffer designed for high speed clock distribution applications.

The ASM5I9351 features LVPECL and LVCMOS reference clock inputs and provides 9 outputs partitioned in 4 banks of 1, 1, 2, and 5 outputs. Bank A divides the VCO output by 2 or 4 while the other banks divide by 4 or 8 per SEL(A:D) settings, see Table.2. These dividers allow output to input ratios of 4:1, 2:1, 1:1, 1:2, and 1:4. Each LVCMOS compatible output can drive 50 series or parallel terminated transmission lines. For series terminated transmission lines, each output of ASM5I9351 can drive one or two traces giving the device an effective fanout of 1:18.

The PLL ASM5I9351 is ensured stable given that the VCO is configured to run between 200 MHz to 500 MHz. This allows a wide range of output frequencies from 25 MHz to 200 MHz. For normal operation, the external feedback input, FB_IN, is connected to one of the outputs. The internal VCO is running at multiples of the input reference clock set by the feedback divider, see the Table 1.

When PLL_EN is LOW, PLL is bypassed and the reference clock directly feeds the output dividers. This mode of ASM5I9351 is fully static and the minimum input clock frequency specification does not apply.