SY89546U Datasheet, PDF (1/10 Pages) Micrel Semiconductor – 2.5V, 3.2Gbps DIFFERENTIAL 4:1 LVDS MULTIPLEXER WITH 1:2 FANOUT AND INTERNAL TERMINATION

Micrel, Inc.
2.5V, 3.2Gbps DIFFERENTIAL 4:1 LVDS
MULTIPLEXER WITH 1:2 FANOUT
AND INTERNAL TERMINATION
Precision Edge^®
Precision E^Sd^Y8g⁹e^5®46U
SY89546U
FEATURES
„ Selects among four differential inputs
„ Provides two copies of the selected input
„ Guaranteed AC performance over temp and voltage:
• DC-to > 3.2Gbps data rate throughput
• < 620ps In-to-Out t_pd
• < 150ps t_r/t_f
„ Unique input isolation design minimizes crosstalk
„ Ultra-low jitter design:
• < 1ps_RMS random jitter
• < 10ps_PP deterministic jitter
• < 10ps_PP total jitter (clock)
• < 0.7ps_RMS crosstalk-induced jitter
„ Internal input termination
„ Unique input termination and V_T pin accepts DC-
coupled and AC-coupled inputs (LVDS, LVPECL,
CML)
„ 350mV LVDS output swing
„ Power supply 2.5V ±5%
„ –40°C to +85°C temperature range
„ Available in 32-pin (5mm x 5mm) MLF^® package
APPLICATIONS
„ SONET/SDH multi-channel select applications
„ Fibre Channel applications
„ GigE applications
TYPICAL PERFORMANCE
Output Amplitude
vs. Frequency
400
350
300
250
200
150
100
50
00 _{1000 2000 3000 4000 5000 6000}
FREQUENCY (MHz)
Precision Edge^®
DESCRIPTION
The SY89546U is a precision, high-speed 4:1 differential
multiplexer that provides two copies of the selected input.
The high speed LVDS (350mV) compatible outputs with a
guaranteed throughput of up to 3.2Gbps over temperature
and voltage.
The SY89546U differential inputs include Micrel’s unique,
3-pin internal termination design that allows access to the
termination network through a V_T pin. This feature allows
the device to easily interface to different logic standards,
both AC- and DC-coupled without external resistor-bias and
termination networks. The result is a clean, stub-free, low
jitter interface solution.
The SY89546U operates from a single 2.5V supply, and
is guaranteed over the full industrial temperature range
(–40°C to +85°C). For applications that require a 3.3V supply,
consider the SY89547L. Or, for applications that only require
one differential output, consider the SY89544U or SY89545L.
The SY89546U is part of Micrel’s Precision Edge^® product
family.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
FUNCTIONAL BLOCK DIAGRAM
IN0
50Ω
V_T0
50Ω
/IN0
IN1
50Ω
V_T1
50Ω
/IN1
IN2
50Ω
V_T2
50Ω
/IN2
IN3
50Ω
V_T3
50Ω
/IN3
4:1 MUX
0
1:2 Fanout
1
MUX
2
S1
3 ^S0
Q0
/Q0
LVDS
Q1
/Q1
Precision Edge is a registered trademark of Micrel, Inc.
MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc.
M9999-082407
[e-mail] or [phone]
1
SEL0 (CMOS/TTL)
SEL1 (CMOS/TTL)
Rev.: C Amendment: /0
Issue Date: August 2007