General Description
The ICS87004I is a highly versatile 1:4 Differentialto-LVCMOS/LVTTL Clock Generator. The ICS87004I has two selectable clock inputs. The CLK0, nCLK0 and CLK1, nCLK1 pairs can accept most standard differential input levels. Internal bias on the nCLK0 and nCLK1 inputs allows the CLK0 and CLK1 inputs to accept LVCMOS/LVTTL. The ICS87004I has a fully integrated PLL and can be configured as a zero delay buffer, multiplier or divider and has an input and output frequency range of 15.625MHz to 250MHz.

Features
• Four LVCMOS/LVTTL outputs, 7Ω typical output impedance
• Selectable CLK0/nCLK0 or CLK1/nCLK1 clock inputs
• CLKx/nCLKx pairs can accept the following differential input levels: LVPECL, LVDS, LVHSTL, HCSL, SSTL
• Internal bias on nCLK0 and nCLK1 to support LVCMOS/LVTTL levels on CLK0 and CLK1 inputs
• Output frequency range: 15.625MHz to 250MHz
• Input frequency range: 15.625MHz to 250MHz
• VCO range: 250MHz to 500MHz
• External feedback for “zero delay” clock regeneration with configurable frequencies
• Programmable dividers allow for the following output-to-input frequency ratios: 8:1, 4:1, 2:1, 1:1, 1:2, 1:4, 1:8
• Fully integrated PLL
• Cycle-to-cycle jitter: 45ps (maximum)
• Output skew: 65ps (maximum)
• Static phase offset: 50ps ± 150ps (3.3V ± 5%), CLK0/nCLK0
• Full 3.3V or 2.5V output operating supply
• 5V tolerant
• -40°C to 85°C ambient operating temperature
• Available in both standard (RoHS 5) and lead-free (RoHS 6) packages