SY58028U_0708 Datasheet, PDF (1/11 Pages) Micrel Semiconductor – ULTRA PRECISION DIFFERENTIAL CML 4:1 MUX WITH 1:2 FANOUT

Micrel, Inc.
ULTRA PRECISION DIFFERENTIAL
CML 4:1 MUX WITH 1:2 FANOUT
AND INTERNAL I/O TERMINATION
Precision Edge^®
Precision E^Sd^Y5g⁸e^0®28U
SY58028U
FEATURES
■ Selects 1 of 4 differential inputs
■ Provides two copies of the selected input
■ Guaranteed AC performance over temperature and
voltage:
• DC-to- > 10.7Gbps data rate throughput
• < 350ps IN-to-Out t_pd
• < 60ps t_r / t_f times
■ Ultra low-jitter design:
• < 10ps_PP total jitter (clock)
• < 1ps_RMS random jitter
• < 10ps_PP deterministic jitter
• < 0.7ps_RMS crosstalk-induced jitter
■ Unique patended input design minimizes crosstalk
■ Accepts an input signal as low as 100mV
■ Unique patended input termination and V_T pin
accepts DC- and AC-coupled inputs (CML, LVPECL,
LVDS)
■ Internal 50Ω output source termination
■ 400mV CML output swing (R_L = 50Ω)
■ Power supply 2.5V ±5% or 3.3V ±10%
■ –40°C to +85°C temperature range
■ Available in 32-pin (5mm × 5mm) MLF^® package
Precision Edge^®
DESCRIPTION
The SY58028U is a 2.5V/3.3V precision, high-speed, 4:1
differential CML multiplexer capable of handling clocks up
to 7GHz and data streams up to 10.7Gbps. In addition, a
1:2 fanout buffer provides two copies of the selected inputs.
The differential input includes Micrel’s unique, 3-pin input
termination architecture that allows customers to interface to
any differential signal (AC- or DC-coupled) as small as 100mV
without any level shifting or termination resistor networks in
the signal path. The result is a clean, stub-free, low-jitter
interface solution. The outputs are 50Ω source terminated
CML, with extremely fast rise/fall times guaranteed to be less
than 60ps.
The SY58028U operates from a 2.5V ±5% supply or a
3.3V ±10% supply and is guaranteed over the full industrial
temperature range of –40°C to +85°C. For applications that
require LVPECL outputs, consider the SY58029U or
SY58030U Multiplexers. The SY58028U is part of Micrel’s
high-speed, Precision Edge^® product line.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
APPLICATIONS
FUNCTIONAL BLOCK DIAGRAM
■ Redundant clock and/or data distribution
■ All SONET/SDH clock/data distribution
■ Loopback
■ All Fibre Channel distribution
■ All Gigabit Ethernet clock and/or data distribution
TYPICAL PERFORMANCE
3.2Gbps Output (2²³Ã1 PRBS)
IN0
50Ω
V_T0
50Ω
/IN0
V_REF-AC0
IN1
50Ω
V_T1
50Ω
/IN1
V_REF-AC1
IN2
50Ω
V_T2
50Ω
/IN2
V_REF-AC2
IN3
50Ω
V_T3
50Ω
TIME (100ps/div.)
/IN3
V_REF-AC3
Precision Edge is a registered trademark of Micrel, Inc.
MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc.
SEL0 (CMOS/TTL)
SEL1 (CMOS/TTL)
M9999-082707
[e-mail] or [phone]
1
4:1
MUX
0
1
MUX
2
3
1:2
Fanout
Q0
/Q0
Q1
/Q1
Rev.: D Amendment: /0
Issue Date: August 2007