or product names are trademarks or registered trademarks of their respective holders. The specifications and information herein are subject to change without notice.
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clk5500_06.1
Lattice Semiconductor
ispClock5500 Family Data Sheet
General Description and Overview
The ispClock5510 and ispClock5520 are in-system-programmable high-fanout PLL-based clock drivers designed
for use in high performance communications and computing applications. The ispClock5510 provides up to 10 sin-
gle-ended or five differential clock outputs, while the ispClock5520 provides up to 20 single-ended or 10 differential
clock outputs. Each pair of outputs may be independently configured to support separate I/O standards (LVDS,
LVPECL, LVTTL, LVCMOS, SSTL, HSTL) and output frequency. In addition, each output provides independent pro-
grammable control of termination, slew-rate, and timing skew. All configuration information is stored on-chip in non-
volatile E
2
CMOS memory.
The ispClock5500’s PLL and divider systems supports the synthesis of clock frequencies differing from that of the
reference input through the provision of programmable input and feedback dividers. A set of five post-PLL V-divid-
ers provides additional flexibility by supporting the generation of five separate output frequencies. Loop feedback
may be taken from the output of any of the five V-dividers.
The core functions of all members of the ispClock5500 family are identical, the differences between devices being
restricted to the number of inputs and outputs, as shown in the following table. Figures 1 and 2 show functional
block diagrams of the ispClock5510 and ispClock5520.
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