SY58011U_11 Datasheet, PDF (1/10 Pages) Micrel Semiconductor – 7GHz, 1:2 CML FANOUT BUFFER/TRANSLATOR

Micrel, Inc.
7GHz, 1:2 CML FANOUT
BUFFER/TRANSLATOR WITH
INTERNAL I/O TERMINATION
Precision E^SYd⁵g⁸e^01®1U
SY58011U
FEATURES
- Precision 1:2, 400mV CML fanout buffer
- Low jitter performance:
• 49fs_RMS phase jitter (typ)
- Guaranteed AC performance over temperature/
voltage:
• > 7GHz f_MAX clock
• < 60ps t_r / t_f times
• < 250ps t_pd
• < 15ps max. skew
- Accepts an input signal as low as 100mV
- Unique input termination and V_T pin accepts DC-
coupled and AC-coupled differential
inputs: LVPECL, LVDS, and CML
- 50ohms source terminated CML outputs
- Power supply 2.5V ±5% and 3.3V ±10%
- Industrial temperature range: –40°C to +85°C
- Available in 16-pin (3mm ∗ 3mm) QFN package
APPLICATIONS
- All SONET and GigE clock distribution
- Fibre Channel clock and data distribution
- Backplanes
- Data distribution: OC-48, OC-48+FEC, XAUI
- High-end, low skew, multiprocessor synchronous
clock distribution
FUNCTIONAL BLOCK DIAGRAM
Precision Edge^®
DESCRIPTION
The SY58011U is a 2.5V/3.3V precision, high-speed, fully
differential 1:2 CML fanout buffer. Optimized to provide two
identical output copies with less than 15ps of skew and only
49fs_RMS phase jitter, the SY58011U can process clock
signals as fast as 7GHz or data patterns up to 10.7Gbps.
The differential input includes Micrel’s unique, 3-pin input
termination architecture that interfaces to LVPECL, LVDS,
or CML differential signals, (AC-coupled or DC-coupled) as
small as 100mV without any level-shifting or termination
resistor networks in the signal path. For AC-coupled input
interface applications, an on-board output reference voltage
(V_REF-AC) is provided to bias the V_T pin. The outputs are
compatible with 400mV typical swing into 50ohms loads,
with extremely fast rise/fall times guaranteed to be less than
60ps.
The SY58011U operates from a 2.5V ±5% supply or 3.3V
±10% supply and is guaranteed over the full industrial
temperature range (–40°C to +85°C). For applications that
require LVPECL outputs, consider the SY58012U or
SY58013U 1:2 fanout buffer with 800mV and 400mV output
swing, respectively. The SY58011U 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.
TYPICAL PERFORMANCE
2GHz Output
V_CC = 2.5V
IN
50Ω
V_T
50Ω
/IN
V_REF-AC
Q0
/Q0
Q1
TIME (70ps/div.)
/Q1
2GHz with 100mV Input
Precision Edge is a registered trademark of Micrel, Inc.
M9999-110311
[e-mail] or [phone]
1
Rev.: G Amendment: /0
Issue Date: November 2011