Cypress Semiconductor Corp CY29947AXCT

Description
The CY29947 is a lowvoltage 200MHz clock distribution buffer with the capability to select one of two LVCMOS/LVTTLcompatible clock inputs. The two clock sources can be used to provide for a test clock as well as the primary system clock. All other control inputs are LVCMOS/LVTTL compatible. The 9 outputs are LVCMOS or LVTTL compatible and can drive 5002 series or parallel terminated transmission lines. For series terminated transmission lines, each output can drive one or two traces giving the device an effective fanout of 1:18. The outputs can also be threestated via the threestate input TS#. Low outputtooutput skews make the CY29947 an ideal clock distribution buffer for nested clock trees in the most demanding of synchronous systems. The CY29947 also provides a synchronous output enable input for enabling or disabling the output clocks. Since this input is internally synchronized to the input clock, potential output glitching or runt pulse generation is eliminated.

Features
2.5V or 3.3V operation
200MHz clock support
LVCMOS/LVTTLcompatible inputs
9 clock outputs: drive up to 18 clock lines
Synchronous Output Enable
Output threestate control
250 ps max. outputtooutput skew
Pin compatible with MPC947, MPC9447

Applications
Clock distribution in highspeed synchronous systems
Test clock generation
Clock buffering for nested clock trees