Description
The NBC12439 and NBC12439A are general purpose, PLL based synthesized clock sources. The VCO will operate over a frequency range of 400 MHz to 800 MHz. The VCO frequency is sent to the N−output divider, where it can be configured to provide division ratios of 1, 2, 4 or 8. The VCO and output frequency can be programmed using the parallel or serial interfaces to the configuration logic. Output frequency steps of 16 MHz, 8 MHz, 4 MHz, or 2 MHz can be achieved using a 16 MHz crystal, depending on the output divider settings. The PLL loop filter is fully integrated and does not require any external components.

FEATUREs
• Best−in−Class Output Jitter Performance, ±20 ps Peak−to−Peak
• 50 MHz to 800 MHz Programmable Differential PECL Outputs
• Fully Integrated Phase−Lock−Loop with Internal Loop Filter
• Parallel Interface for Programming Counter and Output Dividers During Powerup
• Minimal Frequency Overshoot
• Serial 3−Wire Programming Interface
• Crystal Oscillator Inputs 10 MHz to 20 MHz
• Operating Range: VCC = 3.135 V to 5.25 V
• CMOS and TTL Compatible Control Inputs
• Pin and Function Compatible with Motorola MC12439 and MPC9239
• Powerdown of PECL Outputs (16)
• 0°C to 70°C Ambient Operating Temperature (NBC12439)
• −40°C to 85°C Ambient Operating Temperature (NBC12439A)
• Pb−Free Packages are Available