sy55859l Micrel Semiconductor, sy55859l Datasheet - Page 6

• Manufacturer Part Number: sy55859l
• Description: Sy55859l 3.3v, 2.7gbps Dual 2x2 Crosspoint Switch
• Manufacturer: Micrel Semiconductor

Micrel, Inc.
and part-to-part skew matching. As shown in table 1, based
on the logic value at TTL input SELA0, output QA0 replicates
either input DA0 or DA1. TTL input SELA1 selects whether
output QA1 replicates input DA0 or DA1. As shown in table
2, TTL inputs SELB0 and SELB1 perform similarly for outputs
QB0 and QB1 respectively, choosing between inputs DB0
or DB1.
behaves as a redundant distribution device. Depending on
the state of the combined control inputs, QA0 and QA1 will
both replicate either DA0 or DA1. If the two control inputs
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FUNCTIONAL DESCRIPTION
SY55859L is a dual cross point with excellent pin-to-pin
If the two control inputs are tied together, SY55859L
SELA0
SELB0
CTL
CTL
CTL
CTL
0
0
1
1
0
0
1
1
SELA1
SELB1
/CTL
/CTL
CTL
CTL
0
1
0
1
0
1
0
1
Table 1. Input to Output Connectivity, Crosspoint A
Table 2. Input to Output Connectivity, Crosspoint B
Opposite
Opposite
Same
Same
QA0
DA0
DA0
DA1
DA1
QB0
DA0
DA0
DA1
DA1
Opposite
Opposite
Same
Same
QA1
QB1
DA0
DA1
DA0
DA1
DA0
DA1
DA0
DA1
6
are made the logical complement of each other, the
SY55859L functions as a crosspoint, either sending DA0 to
QA0 and DA1 to QA1, or sending DA0 to QA1 and DA1 to
QA0. The same applies to channel B.
individually, 100
terminated, also to 50 . This improves signal integrity. With
all terminations on chip, high-speed interfacing is greatly
simplified, eliminating the need for external termination
passive components. Figures 1 and 2 show the input and
output structures.
SY85859L’s CML outputs are source terminated to 50
differentially. The CML inputs are parallel
Redundant Distribution
Redundant Distribution
Fanout Buffer
Fanout Buffer
Fanout Buffer
Fanout Buffer
Dual Buffer
Dual Buffer
Dual Buffer
Dual Buffer
Crosspoint
Crosspoint
Function
Function
SuperLite™
SY55859L