DESCRIPTION:

The CSP2510C is a high performance, low-skew, low-jitter, phase-lock

loop (PLL) clock driver. It uses a PLL to precisely align, in both frequency

and phase, the feedback (FBOUT) output to the clock (CLK) input signal.

It is specifically designed for use with synchronous DRAMs. The CSP2510C

operates at 3.3V.

One bank of ten outputs provide low-skew, low-jitter copies of CLK.

Output signal duty cycles are adjusted to 50 percent, independent of the

duty cycle at CLK. The outputs can be enabled or disabled via the control

G input. When the G input is high, the outputs switch in phase and frequency

with CLK; when the G input is low, the outputs are disabled to the logic-low

state.

Unlike many products containing PLLs, the CSP2510C 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 CSP2510C 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, as well as

following any changes to the PLL reference or feedback signals. The PLL

can be bypassed for the test purposes by strapping AVDD to ground.

The CSP2510C is specified for operation from 0°C to +85°C. This

device is also available (on special order) in Industrial temperature range

(-40°C to +85°C). See ordering information for details.

FEATURES:

? Phase-Lock Loop Clock Distribution for Synchronous DRAM

Applications

? Distributes one clock input to one bank of ten outputs

? Output enable bank control

? External feedback (FBIN) pin is used to synchronize the

outputs to the clock input signal

? No external RC network required for PLL loop stability

? Operates at 3.3V VDD

? tpd Phase Error at 133MHz: < ±150ps

? Jitter (peak-to-peak) at 133MHz: < ±75ps @ 133MHz

? Spread Spectrum Compatible

? Operating frequency 25MHz to 140MHz

? Available in 24-Pin TSSOP package