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