CY29948 2.5 V or 3.3 V, 200 MHz, 1:12 Clock Distribution Buffer 2.5 V or 3.3 V, 200 MHz, 1:12 Clock Distribution Buffer Features Functional Description 2.5 V or 3.3 V operation The CY29948 is a low-voltage 200 MHz clock distribution buffer with the capability to select either a differential LVPECL or a 200 MHz clock support LVCMOS/LVTTL compatible input clock. The two clock sources can be used to provide for a test clock as well as the primary LVPECL or LVCMOS/LVTTL clock input system clock. All other control inputs are LVCMOS/LVTTL LVCMOS-/LVTTL-compatible inputs compatible. The 12 outputs are LVCMOS or LVTTL compatible and can drive 50 series or parallel terminated transmission 12 clock outputs: drive up to 24 clock lines lines. For series terminated transmission lines, each output can Synchronous Output Enable drive one or two traces giving the device an effective fanout of 1:24. The outputs can also be three-stated via the three-state Output three-state control input TS . Low output-to-output skews make the CY29948 an ideal clock distribution buffer for nested clock trees in the most 150 ps typical output-to-output skew demanding of synchronous systems. Pin compatible with MPC948, MPC948L, MPC9448 The CY29948 also provides a synchronous output enable input Available in Commercial and Industrial temp. range for enabling or disabling the output clocks. Since this input is internally synchronized to the input clock, potential output 32-pin TQFP package glitching or runt pulse generation is eliminated. For a complete list of related documentation, click here. Block Diagram VDD VDDC PECL CLK 0 PECL CLK 12 Q0-Q11 TCLK 1 TCLK SEL SYNC OE TS Cypress Semiconductor Corporation 198 Champion Court San Jose, CA 95134-1709 408-943-2600 Document Number: 38-07288 Rev. *J Revised April 17, 2018CY29948 Contents Pin Configuration .............................................................3 Acronyms ........................................................................ 11 Pin Description .................................................................3 Document Conventions ................................................. 11 Output Enable/Disable .....................................................4 Units of Measure ....................................................... 11 Maximum Ratings .............................................................5 Document Revision History ........................................... 12 DC Parameters ..................................................................5 Sales, Solutions, and Legal Information ...................... 13 Thermal Resistance ..........................................................6 Worldwide Sales and Design Support ....................... 13 AC Parameters ..................................................................6 Products .................................................................... 13 Ordering Information ........................................................9 PSoC Solutions ...................................................... 13 Ordering Code Definitions ...........................................9 Cypress Developer Community ................................. 13 Package Diagrams ..........................................................10 Technical Support ..................................................... 13 Document Number: 38-07288 Rev. *J Page 2 of 13