Micrel, Inc.
ULTRA PRECISION 4×4 CML SWITCH WITH INTERNAL I/O TERMINATION
Precision ESdY5g8e0®40U SY58040U
FEATURES
■ Provides crosspoint switching between any input pair to any output pair
■ Ultra-low jitter design: • 67fsRMS phase jitter (typ)
■ Guaranteed AC performance over temperature and voltage:
• DC to >5Gbps throughput • <350ps propagation delay • <60ps tr / tf times • <25ps skew (output-to-output)
■ Unique, patent-pending, channel-to-channel isolation design provides superior crosstalk performance
■ Unique, patent-pending, 50Ω input termination extended CMVR, and VT pin accepts DC- and ACcoupled differential inputs
■ 400mV CML output swing
■ 50Ω source terminated outputs minimize round-trip reflections
■ Power supply 2.5V ±5% or 3.3V ±10%
■ –40°C to +85°C temperature range
■ Available in 44-pin (7mm × 7mm) QFN package
■ Pb-Free green package
Precision Edge®
DESCRIPTION
The SY58040U is a low jitter, low skew, high-speed 4×4 crosspoint switch optimized for precision telecom and enterprise server/storage distribution applications. The SY58040U distributes clock frequencies from DC to 4GHz, and data rates to 5Gbps guaranteed over temperature and voltage.
The SY58040U differential input includes Micrel’s unique, 3-pin input termination architecture that directly interfaces to any differential signal (AC- or DC-coupled) as small as 100mV (200mVpp) without any level shifting or termination resistor networks in the signal path. The outputs are 50Ω source-terminated CML with extremely fast rise/fall times guaranteed to be less than 60ps.
The SY58040U features a patent-pending isolation design that significantly improves on channel-to-channel crosstalk performance.
The SY58040U operates from a 2.5V ±5% or 3.3V ±10% supply and is guaranteed over the full industrial temperature range of –40°C to +85°C. The SY58040U is part of Micrel’s high-speed, Precision Edge® product line.
Datasheets and support documentation can be found on Micrel’s web site at: www.micrel.com.
APPLICATIONS
■ Data communication systems ■ All SONET/SDH data/clock applications ■ All Fibre Channel applications ■ All Gigabit Ethernet applications
United States Patent No. RE44,134 Precision Edge is a registered trademark of Micrel, Inc.
M9999-103009
[email protected] or (408) 955-1690
1
Rev.: F Amendment: /0 Issue Date: October 2011
Micrel, Inc.
Functional block diagram
SY58040U
TRUTH TABLES
Input Select Address Table
SIN1
SIN0
INPUT
0
0 IN0
0
1 IN1
1
0 IN2
1
1 IN3
Output Select Address Table
SOUT1
SOUT0
OUTPUT
0
0 Q0
0
1 Q1
1
0 Q2
1
1 Q3
M9999-103009
[email protected] or (408) 955-1690
2
Micrel, Inc.
SY58040U
PACKAGE/ORDERING INFORMATION
Ordering Information(1)
Part Number
Package Operating Type Range
Package Marking
SY58040UMY(3)
QFN-44 Industrial SY58040U Pb-Free
Pb-Free
bar-line indicator
SY58040UMYTR(2, 3) QFN-44 Industrial SY58040U Pb-Free
Pb-Free .