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Micrel Semiconductor

SY58603U Datasheet Preview

SY58603U Datasheet

Precision CML Buffer

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SY58603U
4.25Gbps Precision CML Buffer with Internal
Termination and Fail Safe Input
General Description
The SY58603U is a 2.5/3.3V, high-speed, fully
differential CML buffer optimized to provide less than
10pspp total jitter. The SY58603U can process clock
signals as fast as 2.5GHz or data patterns up to
4.25Gbps.
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 (200mVpp) without any
level-shifting or termination resistor networks in the
signal path. For AC-coupled input interface applications,
an integrated voltage reference (VREF-AC) is provided to
bias the VT pin. The output is 400mV CML, with
extremely fast rise/fall times guaranteed to be less than
85ps.
The SY58603U 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 or LVDS outputs,
consider the SY58604U and SY58605U, buffers with
800mV and 325mV output swings respectively. The
SY58603U is part of Micrel’s high-speed, Precision
Edge® product line.
Data sheets and support documentation can be found
on Micrel’s web site at: www.micrel.com.
Functional Block Diagram
Features
Precision Edge®
Precision 400mV CML buffer
Guaranteed AC performance over temperature and
voltage:
– DC-to >4.25Gbps throughput
– <300ps propagation delay (IN-to-Q)
– <85ps rise/fall times
Fail Safe Input
– Prevents output from oscillating when input is
invalid
Ultra-low jitter design
– <1psRMS cycle-to-cycle jitter
– <10psPP total jitter
– <1psRMS random jitter
– <10psPP deterministic jitter
High-speed CML output
2.5V ±5% or 3.3V ±10% power supply operation
Industrial temperature range: –40°C to +85°C
Available in 8-pin (2mm x 2mm) DFN package
Applications
Data Distribution: OC-48, OC-48+FEC, XAUI
Backplane Buffering
SONET clock or data distribution
Fibre Channel clock or data distribution
Gigabit Ethernet clock or data distribution
Markets
United States Patent No. RE44,134
Precision Edge is a registered trademark of Micrel, Inc.
Storage
ATE
Test and measurement
Enterprise networking equipment
High-end servers
Access
Metro area network equipment
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
August 2007
M9999-082707-B
hbwhelp@micrel.com or (408) 955-1690




Micrel Semiconductor

SY58603U Datasheet Preview

SY58603U Datasheet

Precision CML Buffer

No Preview Available !

Micrel, Inc.
Ordering Information(1)
Part Number
Package
Type
Operating
Range
Package Marking
SY58603UMG
SY58603UMGTR(2)
DFN-8
DFN-8
Industrial
Industrial
603 with Pb-Free
bar-line indicator
603 with Pb-Free
bar-line indicator
Notes:
1. Contact factory for die availability. Dice are guaranteed at TA = 25°C, DC Electricals only.
2. Tape and Reel.
Lead
Finish
NiPdAu
Pb-Free
NiPdAu
Pb-Free
Pin Configuration
SY58603U
8-Pin DFN
Pin Description
Pin Number
1, 4
2
3
5
6, 7
8
Pin Name
IN, /IN
VT
VREF-AC
GND
Exposed pad
/Q, Q
VCC
Pin Function
Differential Input: This input pair is the differential signal input to the device. Input
accepts DC-Coupled differential signals as small as 100mV (200mVpp). Each pin of
this pair internally terminates with 50Ω to the VT pin. If the input swing falls below a
certain threshold (typical 30mV), the Fail Safe Input (FSI) feature will guarantee a
stable output by latching the output to its last valid state. See “Input Interface
Applications” section for more details.
Input Termination Center-Tap: Each side of the differential input pair terminates to
VT pin. This pin provides a center-tap to a termination network for maximum
interface flexibility. See “Input Interface Applications” section.
Reference Voltage: This output biases to VCC–1.2V. It is used for AC-coupling input
IN and /IN. Connect VREF-AC directly to the corresponding VT pin. Bypass with
0.01µF low ESR capacitor to VCC. Maximum sink/source current is ±1.5mA. Please
refer to the “Input Interface Applications” section for more details.
Ground: Exposed pad must be connected to a ground plane that is the same
potential as the ground pin.
CML Differential Output Pair: Differential buffered output copy of the input signal.
The output swing is typically 400mV. See “CML Output Termination” section.
Positive Power Supply: Bypass with 0.1uF//0.01uF low ESR capacitors as close to
the VCC pin as possible.
August 2007
2 M9999-082707-B
hbwhelp@micrel.com or (408) 955-1690


Part Number SY58603U
Description Precision CML Buffer
Maker Micrel Semiconductor
Total Page 13 Pages
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