PCK2509SL

INTEGRATED CIRCUITS PCK2509SL 50–150 MHz 1:9 SDRAM clock driver Product specification ICL03 — PC Motherboard ICs; Logic Products Group 2000 Dec 01 Philips Semiconductors Philips Semiconductors Product specification 50–150 MHz 1:9 SDRAM clock driver PCK2509SL FEATURES Phase-Locked Loop Clock distribution for PC100/PC133 SDRAM applications When outputs are disabled, the PLL and feedback output are adjusted to 50 percent, independent of the duty cycle at CLK. Each bank of outputs can be enabled or disabled separately via the control (1G and 2G) inputs. When the G inputs are high, the outputs switch in phase and frequency with CLK; when the G inputs are low, the outputs are disabled to the logic–low state. Unlike many products containing PLLs, the PCK2509SL does not require external RC networks. The loop filter for the PLL is included on-chip, minimizing component count, board space, and cost. Because it is based on PLL circuitry, the PCK2509SL requires a stabilization time to achieve phase lock of the feedback signal to the reference signal. This stabilization time is required, following power up and application of a fixed-frequency, fixed-phase signal at CLK, and following any changes to the PLL reference or feedback signals. The PLL can be bypassed for test purposes by strapping AVCC to ground. The PCK2509SL is characterized for operation from 0 °C to +70 °C. disabled, dropping AICC to 100 µA in stand-by mode when input clock signal is present. See PCK2509SA ...