1
Precision Edge
SY58022U
Micrel, Inc.
DESCRIPTION
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:
< 10ps
PP
total jitter (clock)
< 1ps
RMS
random jitter (data)
< 10ps
PP
deterministic jitter (data)
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%
40C to +85C temperature range
Available in 16-pin (3mm 3mm) MLFTM package
FEATURES
Precision Edge
SY58022U
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
Rev.: B
Amendment: /0
Issue Date: May 2005
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 (40C to +85C). 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.
FUNCTIONAL BLOCK DIAGRAM
Precison Edge is a registered trademark of Micrel, Inc.
MicroLeadFrame and MLF are trademarks of Amkor Technology, Inc.
TYPICAL PERFORMANCE
Precision Edge
5.5GHz 1:4 FANOUT BUFFER/
TRANSLATOR w/400mV LVPECL
OUTPUTS AND INTERNAL INPUT TERMINATION
2
Precision Edge
SY58022U
Micrel, Inc.
Ordering Information
(1)
Package Operating
Package
Lead
Part Number
Type
Range
Marking
Finish
SY58022UMI MLF-16
Industrial
022U
Sn-Pb
SY58022UMITR
(2)
MLF-16 Industrial
022U
Sn-Pb
SY58022UMI MLF-16
Industrial
022U
with
Pb-Free
Pb-Free bar-line indicator
NiPdAu
SY58022UMITR
(2)
MLF-16 Industrial
022U
with
Pb-Free
Pb-Free bar-line indicator
NiPdAu
Notes:
1. Contact factory for die availability. Die are guaranteed at T
A
= 25C, DC electricals only.
2. Tape and Reel.
PACKAGE/ORDERING INFORMATION
Pin Number
Pin Name
Pin Function
1, 4
IN, /IN
Differential Input: This input pair receives the signal to be buffered. Each pin is internally
terminated with 50 to the V
T
pin. Note that this input will default to an indeterminate state
if left open. See "Input Interface Applications" section.
2
VT 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
fl exibility. See "Input Interface Applications" section.
3
VREF-AC
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 0.01F low ESR
capacitor to V
CC
. See "Input Interface Applications" section.
8, 13
VCC
Positive Power Supply: Bypass with 0.1F//0.01F low ESR capacitors as close to the
pins as possible. A 0.01F capacitor should be as close to the V
CC
pin as possible.
5, 16
GND,
Ground. Exposed pad must be connected to a ground plane that is the same potential
Exposed Pad
as the ground pin.
14, 15
/Q0, Q0,
LVPECL Differential Output Pairs: Differential buffered output copy of the input signal. The
11, 12
/Q1, Q1,
output swing is typically 400mV. Proper termination is 50 to V
CC
2V at the receiving
9, 10
/Q2, Q2,
end. Unused output pairs may be left fl oating with no impact on jitter or skew.
6, 7
/Q3, Q3,
See "LVPECL Output Termination" section.
PIN DESCRIPTION
13
14
15
16
12
11
10
9
1
2
3
4
8
7
6
5
IN
VT
VREF-AC
/IN
Q1
/Q1
Q2
/Q2
GND
Q0
/Q0
VCC
GND
/Q3
Q3
VCC
16-Pin MLFTM (MLF-16)
3
Precision Edge
SY58022U
Micrel, Inc.
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.) ................................................... 260C
Storage Temperature Range (T
STORE
) .......... 65 to +150C
Operating Ratings
(2)
Power Supply Voltage (V
CC
) .................. +2.375V to +3.60V
Operating Temperature Range (T
A
) ............ 40C to +85C
Package Thermal Resistance
MLFTM (
JA
)
Still-Air
..........................................................................................................
60C/W
500lpfm
.......................................................................................................
54C/W
MLFTM (
JB
)
(Junction-to-Board Resistance), Note 3 ........ 33C/W
T
A
= 40C to +85C
Symbol Parameter
Condition
Min
Typ
Max
Units
V
CC
Power Supply Voltage
V
CC
=
2.5V
2.375 2.5 2.625 V
V
CC
= 3.3V
3.0
3.3
3.60
V
I
CC
Power Supply Current
No load, V
CC
= max
125
160
mA
V
IH
Input HIGH Voltage
IN, /IN, Note 6
V
CC
1.6
V
CC
V
V
IL
Input LOW Voltage
IN, /IN
0
V
IH
0.1 V
V
IN
Input Voltage Swing
IN, /IN; See Figure 1a
0.1
3.6
V
V
DIFF_IN
Differential Input Voltage
IN, /IN; See Figure 1b
0.2
3.4
V
R
IN
IN-to-V
T
Resistance
40 50 60
V
REF-AC
Output Reference Voltage
V
CC
1.3 V
CC
1.2 V
CC
1.1 V
V
T IN
IN-to-V
T
Voltage
1.28
V
DC ELECTRICAL CHARACTERISTICS
(Note 5)
V
CC
= 3.3V 10% or V
CC
= 2.5 5%; R
L
= 50 to V
CC
2V; T
A
= 40C to 85C, unless otherwise stated.
Symbol Parameter
Condition
Min Typ Max
Units
V
OH
Output HIGH Voltage
V
CC
1.145 V
CC
1.020 V
CC
0.895 V
V
OL
Output LOW Voltage
V
CC
1.545 V
CC
1.420 V
CC
1.295 V
V
OUT
Output Differential Swing
see Figure 1a
150
400
650
mV
V
DIFF_OUT
Deferential
Output
Swing
see Figure 1b
300
800
1300
mV
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.
2. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings.
3. Thermal performance assumes exposed pad is soldered (or equivalent) to the device's most negative potential on the PCB.
4. Due to the limited drive capability, use for input of the same package only.
5. The circuit is designed to meet the DC specifi cations shown in the above table after thermal equilibrium has been established.
6. V
IH
(min.) not lower than 1.2V.
LVPECL DC ELECTRICAL CHARACTERISTICS
(Note 5)
4
Precision Edge
SY58022U
Micrel, Inc.
TIMING DIAGRAM
Figure 1a. Single-Ended Swing
Figure 1b. Differential Swing
SINGLE-ENDED AND DIFFERENTIAL SWINGS
V
CC
= 2.5V 5% or 3.3V 10%; R
L
= 50 to V
CC
2V; T
A
= 40C to +85C, unless otherwise stated.
Symbol Parameter
Condition
Min
Typ
Max
Units
f
MAX
Maximum Operating Frequency
V
OUT
200mV
Clock
5.5
GHz
NRZ
Data
10
Gbps
t
pd
Propagation
Delay
130 200 280 ps
t
CHAN
Channel-to-Channel
Skew
Note 7
4
15
ps
t
SKEW
Part-to-Part
Skew
Note 8
50
ps
t
JITTER
Clock Cycle-to-Cycle
Jitter
Note 9
1
ps
RMS
Total
Jitter
Note 10
10 ps
PP
Data
Random
Jitter
Note 11
2.5Gbps 3.2Gbps
1
ps
RMS
Deterministic
Jitter
Note 12
2.5Gbps 3.2Gbps
10
ps
PP
t
r
, t
f
Output Rise/Fall Time 20% to 80%
At full swing
20
50
80
ps
Notes:
7.
Skew is measured between outputs of the same bank under identical transitions.
8.
Skew is defi ned for two parts with identical power supply voltages at the same temperature and with no skew of the edges at the respective inputs.
9.
Cycle-to-cycle jitter defi nition: the variation of periods between adjacent cycles, T
n
T
n1
where T is the time between rising edges of the output
signal.
10. Total jitter defi nition: with an ideal clock input of frequency f
MAX
, no more than one output edge in 10
12
output edges will deviate by more than the
specifi ed peak-to-peak jitter value.
11. Random jitter is measured with a K28.7 comma detect character pattern, measured at 2.5Gbps/3.2Gbps.
12. Deterministic jitter is measured at 2.5Gbps/3.2Gbps with both K28.5 and 2
23
1 PRBS pattern.
AC ELECTRICAL CHARACTERISTICS
5
Precision Edge
SY58022U
Micrel, Inc.
TYPICAL OPERATING CHARACTERISTICS
V
CC
= 3.3V, V
EE
= 0V, V
IN
= 100mV, T
A
= 25C, unless otherwise stated.
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