Micrel, Inc.
Precision Edge
5.5GHz 1:4
FANOUT
BUFFER/
Precision Edge
®
SY58022U
TRANSLATOR w/400mV LVPECL
SY58022U
OUTPUTS AND INTERNAL INPUT TERMINATION
®
FEATURES
■
Precision 1:4, 400mV LVPECL fanout buffer
■
Guaranteed AC performance over temperature and
voltage:
•
> 5.5GHz f
MAX
clock
•
< 80ps t
r
/t
f
times
•
< 250ps (V
IN
≥ 300mV) t
pd
•
< 15ps max. skew
■
Low jitter performance:
•
60fs RMS phase jitter
■
Accepts an input signal as low as 100mV
■
Unique input termination and V
T
pin accepts
DC- and AC-coupled differential inputs: LVPECL,
LVDS and CML
■
400mV LVPECL compatible outputs
■
Power supply 2.5V ±5% and 3.3V ±10%
■
–40°C to +85°C temperature range
■
Available
in 16-pin (3mm
×
3mm) QFN
package
Precision Edge
®
DESCRIPTION
The SY58022U is a 2.5V/3.3V precision, high-speed, fully
differential 1:4 LVPECL fanout buffer. Optimized to provide
four identical output copies with less than 15ps of skew and
less than 10ps
PP
total jitter, the SY58022U can process clock
signals as fast as 5.5GHz.
The differential input includes Micrel’s unique, 3-pin input
termination architecture interfaces to differential LVPECL,
CML, and LVDS signals (AC- 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 400mV LVPECL
compatible, with extremely fast rise/fall times guaranteed to
be less than 80ps.
The SY58022U 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 greater output swing or CML compatible outputs,
consider the SY58021U 1:4 fanout buffer with LVPECL
outputs, or the SY58020U 1:4 fanout buffer with 400mV
CML outputs. The SY58022U is part of Micrel’s high-speed,
Precision Edge
®
product line. All data sheets and support
documentation can be found on Micrel’s web site at: www.
micrel.com.
APPLICATIONS
■
■
■
■
■
All SONET and All GigE clock distribution
Fibre Channel clock and data distribution
Backplane distribution
Data distribution: OC-48, OC-48+FEC, XAUI
High-end, low-skew, multiprocessor synchronous
clock distribution
FUNCTIONAL
BLOCK DIAGRAM
IN
50Ω
V
T
/IN
V
REF-AC
50Ω
TYPICAL PERFORMANCE
Q0
/Q0
Q1
/Q1
Q2
/Q2
Q3
/Q3
United States Patent No. RE44,134
Precison Edge is a registered trademark of Micrel, Inc.
Rev.: E
Amendment: /1
1
Issue Date: June 2009
Micrel, Inc.
Precision Edge
®
SY58022U
PACKAGE/ORDERING INFORMATION
GND
Ordering Information
(1)
12
11
10
9
/Q0
VCC
Q0
16
15
14
13
IN
VT
VREF-AC
/IN
1
2
3
4
5
6
7
8
Q1
/Q1
Q2
/Q2
Part Number
SY58022UMG
SY58022UMGTR
(2)
Notes:
Package
Type
MLF-16
MLF-16
Operating
Range
Industrial
Industrial
Package
Marking
022U with
Pb-Free bar-line indicator
022U with
Pb-Free bar-line indicator
Lead
Finish
Pb-Free
NiPdAu
Pb-Free
NiPdAu
GND
/Q3
VCC
Q3
1. Contact factory for die availability. Die are guaranteed at T
A
= 25°C, DC electricals only.
2. Tape and Reel.
16-Pin QFN
PIN DESCRIPTION
Pin Number
1, 4
Pin Name
IN, /IN
Pin Function
Differential Input: This input pair receives the signal to be buffered. Each pin is internally
terminated with
50Ω
to the V
T
pin. Note that this input will default to an indeterminate state
if left open. See “Input Interface Applications” section.
Input Termination Center-Tap: Each input terminates to this pin. The V
T
pin provides a
center-tap for each input (IN, /IN) to the termination network for maximum interface
flexibility.
See “Input Interface Applications” section.
Reference Output Voltage: This output biases to V
CC
–1.2V. It is used when AC-coupling
to differentail inputs. Connect V
REF-AC
directly to the V
T
pin. Bypass with 0.01µF low ESR
capacitor to V
CC
. See “Input Interface Applications” section.
Positive Power Supply: Bypass with 0.1µF//0.01µF low ESR capacitors as close to the
pins as possible. A 0.01µF capacitor should be as close to the V
CC
pin as possible.
Ground. Exposed pad must be connected to a ground plane that is the same potential
as the ground pin.
LVPECL Differential Output Pairs: Differential buffered output copy of the input signal. The
output swing is typically 400mV. Proper termination is
50Ω
to V
CC
–2V at the receiving
end. Unused output pairs may be left
floating
with no impact on jitter or skew.
See “LVPECL Output Termination” section.
2
VT
3
VREF-AC
8, 13
5, 16
14, 15
11, 12
9, 10
6, 7
VCC
GND,
Exposed Pad
/Q0, Q0,
/Q1, Q1,
/Q2, Q2,
/Q3, Q3,
2
Micrel, Inc.
Precision Edge
®
SY58022U
Absolute Maximum Ratings
(1)
Power Supply Voltage (V
CC
) ........................–0.5V to +4.0V
Input Voltage (V
IN
).............................................–0.5V to V
CC
Output Current (I
OUT
)
Continuous ............................................................. 50mA
Surge .................................................................... 100mA
V
T
Current
Source or sink current on V
T
pin ......................... ±100mA
Input Current
Source or sink current on (IN, /IN) ........................ ±50mA
V
REF
Current
Source or sink current on V
REF-AC
, Note 4............. ±1.5mA
Soldering, (20 sec.) ................................................... 260°C
Storage Temperature Range (T
STORE
) .......... –65 to +150°C
Operating Ratings
(2)
Power Supply Voltage (V
CC
) .................. +2.375V to +3.60V
Operating Temperature Range (T
A
) ............ –40°C to +85°C
Package Thermal Resistance
QFN
(θ
JA
)
Still-Air
..........................................................................................................
60°C/W
500lpfm
.......................................................................................................
54°C/W
QFN
(θ
JB
)
(Junction-to-Board Resistance), Note 3 ........ 33°C/W
DC ELECTRICAL CHARACTERISTICS
(Note 5)
T
A
= –40°C to +85°C
Symbol
V
CC
I
CC
V
IH
V
IL
V
IN
V
DIFF_IN
R
IN
V
REF-AC
V
T IN
Parameter
Power Supply Voltage
Power Supply Current
Input HIGH Voltage
Input LOW Voltage
Input Voltage Swing
Differential Input Voltage
IN-to-V
T
Resistance
Output Reference Voltage
IN-to-V
T
Voltage
Condition
V
CC
= 2.5V
V
CC
= 3.3V
No load, V
CC
= max
IN, /IN, Note 6
IN, /IN
IN, /IN; See Figure 1a
IN, /IN; See Figure 1b
V
CC
–1.6
0
0.1
0.2
40
50
Min
2.375
3.0
Typ
2.5
3.3
125
Max
2.625
3.60
160
V
CC
V
IH
–0.1
3.6
3.4
60
1.28
Units
V
V
mA
V
V
V
V
Ω
V
V
V
CC
–1.3 V
CC
–1.2 V
CC
–1.1
LVPECL DC ELECTRICAL CHARACTERISTICS
(Note 5)
V
CC
= 3.3V ±10% or V
CC
= 2.5 ±5%; R
L
=
50Ω
to V
CC
–2V; T
A
= –40°C to 85°C, unless otherwise stated.
Symbol
V
OH
V
OL
V
OUT
V
DIFF_OUT
Notes:
1.
Permanent device damage may occur if ABSOLUTE MAXIMUM RATINGS are exceeded. This is a stress rating only and functional operation is not
implied at conditions other than those detailed in the operational sections of this data sheet. Exposure to ABSOLUTE MAXIMUM RATINGS condi-
tions for extended periods may affect device reliability.
The data sheet limits are not guaranteed if the device is operated beyond the operating ratings.
Thermal performance assumes exposed pad is soldered (or equivalent) to the device’s most negative potential on the PCB.
Due to the limited drive capability, use for input of the same package only.
The circuit is designed to meet the DC
specifications
shown in the above table after thermal equilibrium has been established.
V
IH
(min.) not lower than 1.2V.
Parameter
Output HIGH Voltage
Output LOW Voltage
Output Differential Swing
Differential Output Swing
Condition
Min
Typ
Max
Units
V
V
mV
mV
V
CC
–1.145 V
CC
–1.020 V
CC
–0.895
V
CC
–1.545 V
CC
–1.420 V
CC
–1.295
see Figure 1a
see Figure 1b
150
300
400
800
650
1300
2.
3.
4.
5.
6.
3
Micrel, Inc.
Precision Edge
®
SY58022U
AC ELECTRICAL CHARACTERISTICS
V
CC
= 2.5V ±5% or 3.3V ±10%; R
L
=
50Ω
to V
CC
–2V; T
A
= –40°C to +85°C, unless otherwise stated.
Symbol
f
MAX
t
pd
t
CHAN
t
SKEW
t
JITTER
t
r
, t
f
Notes:
7.
8.
Skew is measured between outputs of the same bank under identical transitions.
Skew is
defined
for two parts with identical power supply voltages at the same temperature and with no skew of the edges at the respective inputs.
Parameter
Maximum Operating Frequency
Propagation Delay
Channel-to-Channel Skew
Part-to-Part Skew
RMS Phase Jitter
Output Rise/Fall Time 20% to 80%
Condition
V
OUT
≥
200mV
Clock
NRZ Data
Min
5.5
Typ
10
Max
Units
GHz
Gbps
130
Note 7
Note 8
Output = 622MHz
Integration range: 12kHz - 20MHz
At full swing
20
200
4
60
50
280
15
50
ps
ps
ps
fs
80
ps
TIMING DIAGRAM
/IN
IN
/Q
Q
t
pd
SINGLE-ENDED AND DIFFERENTIAL SWINGS
V
IN
,
V
OUT
400mV
V
DIFF_IN
,
V
DIFF_OUT
800mV
Figure 1a. Single-Ended Swing
4
Figure 1b. Differential Swing
Micrel, Inc.
Precision Edge
®
SY58022U
TYPICAL OPERATING CHARACTERISTICS
V
CC
= 3.3V, V
EE
= 0V, V
IN
= 100mV, T
A
= 25°C, unless otherwise stated.
500
450
400
Amplitude
vs. Frequency
3.5
3.0
2.5
SKEW (ps)
2.0
1.5
1.0
0.5
10000
12000
Skew
vs. Temperature
PROPAGATION DELAY (ps)
215
Propagtion Delay
vs. Input Voltage Swing
AMPLITUDE (mV)
350
300
250
200
150
100
50
0
210
205
200
0
-60 -40 -20 0 20 40 60 80 100
TEMPERATURE(°C)
2000
4000
6000
FREQUENCY (MHz)
8000
0
195
0
200 400 600 800 1000 1200
INPUT VOLTAGE SWING (mV)
203
PROPAGATION DELAY (ps)
202
201
200
199
198
197
Progation Delay
vs. Temperature
196
-60 -40 -20 0 20 40 60 80 100
TEMPERATURE(°C)
5
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