1
Precision EdgeTM
SY58012U
Micrel
DESCRIPTION
Precision 1:2, 800mV LVPECL fanout buffer
Guaranteed AC performance over temperature/
voltage:
> 5GHz f
MAX
(clock)
< 110ps t
r
/ t
f
times
< 260ps t
pd
< 15ps max skew
Low jitter performance
< 10ps
(pk-pk)
total jitter (clock)
< 1ps
(rms)
random jitter (data)
< 10ps
(pk-pk)
deterministic jitter (data)
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
Outputs are 100k LVPECL compatible, 800mV swing
Power supply 2.5V
5% and 3.3V
10%
40
C to +85
C temperature range
Available in 16-pin (3mm
3mm) MLFTM package
FEATURES
5GHz, 1:2 LVPECL FANOUT
BUFFER/TRANSLATOR
WITH INTERNAL INPUT TERMINATION
Precision EdgeTM
SY58012U
APPLICATIONS
s All SONET and GigE clock distribution
s
Fibre Channel clock and data distribution
s
Backplane distribution
s
High-end, low skew, multiprocessor synchronous
clock distribution
Rev.: A
Amendment: /0
Issue Date:
July 2003
The SY58012U is a 2.5V/3.3V precision, high-speed, fully
differential 1:2 LVPECL fanout buffer. Optimized to provide
two identical output copies with less than 15ps of skew and
less than 10ps
(pk-pk)
total jitter, the SY58012U can process
clock signals as fast as 5GHz or 5Gbps data.
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
100k LVPECL compatible, with extremely fast rise/fall times
guaranteed to be less than 110ps.
The SY58012U 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 faster rise/fall times, or greater bandwidth, consider
the SY58013U 1:2 fanout buffer with 400mV output swing,
or the SY58011 1:2 CML (400mV) fanout buffer. The
SY58012U is part of Micrel's high-speed, Precision EdgeTM
product line. Data sheets and support documentation can
be found on Micrel's web site at www.micrel.com.
FUNCTIONAL BLOCK DIAGRAM
TYPICAL PERFORMANCE
Precision Edge is a trademark of Micrel , Inc.
Micro
LeadFrame and MLF are trademarks of Amkor Technology, Inc.
IN
/IN
Q1
/Q1
Q0
/Q0
V
T
50
50
V
REF
-AC
2.5GHz Output
TIME (50ps/div.)
Output Swing
(200mV/div
.
)
V
CC
= 3.3V
2GHz with 100mV Input
Precision EdgeTM
2
Precision EdgeTM
SY58012U
Micrel
PACKAGE/ORDERING INFORMATION
Ordering Information
(Note 1)
Package
Operating
Package
Part Number
Type
Range
Marking
SY58012UMI
MLF-16
Industrial
012U
SY58012UMITR
(Note 2)
MLF-16
Industrial
012U
Note 1.
Contact factory for die availability. Die are guaranteed at T
A
=
25
C, DC electricals only.
Note 2.
Tape and Reel.
Pin Number
Pin Name
Pin Function
1, 4
IN, /IN
Differential Input: This input pair is the signal to be buffered. Each pin of this pair internally
terminates 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 a termination network for maximum interface flexibility.
See
"Input Interface Applications"
section.
3
VREF-AC
Reference Output Voltage: This output biases to V
CC
1.4V. It is used when AC-coupling
the inputs (IN, /IN). Connect V
REF-AC
directly to the V
T
pin. Bypass with 0.01
F low ESR
capacitor to V
CC
. Maximum current source or sink is 0.5mA. See
"Input Interface
Applications"
section.
5, 8, 13, 16
VCC
Positive Power Supply: Bypass with 0.1
F//0.01
F low ESR capacitors as close to the
V
CC
pins as possible.
6, 7, 14, 15
GND,
Ground. Exposed pad must be connected to a ground plane that is the same potential
Exposed Pad
as the ground pin.
12, 11
Q0, /Q0,
LVPECL Differential Output Pairs: Differential buffered output copy of the input signal. The
9, 10
Q1, /Q1
output swing is typically 800mV. Unused output pairs may be left floating with no impact on
jitter. See "
LVPECL Output Termination"
section.
PIN DESCRIPTION
1
2
3
4
12
11
10
9
16 15 14 13
5
6
7
8
IN
VT
VREF-AC
/IN
Q0
/Q0
/Q1
Q1
VCC
GND
GND
VCC
VCC
GND
GND
VCC
16-Pin MLFTM
3
Precision EdgeTM
SY58012U
Micrel
Absolute Maximum Ratings
(Note 1)
Power Supply Voltage (V
CC
) ...................... 0.5V to +4.0V
Input Voltage (V
IN
) ......................................... 0.5V to V
CC
LVPECL Output Current (I
OUT
)
Continuous ............................................................. 50mA
Surge .................................................................... 100mA
Source or sink current on V
T
pin
V
T
Current ..........................................................
100mA
Source or sink current on IN, /IN
Input Current ........................................................
50mA
Source or sink current on V
REF-AC
, Note 4
V
REF
Current .......................................................
1.5mA
Soldering, (10 seconds) ............................................ 270
C
Storage Temperature Range (T
STORE
) ... 65
C to +150
C
Operating Ratings
(Note 2)
Power Supply Voltage (V
CC
) ..................... 2.375V to 3.60V
Operating Temperature Range (T
A
) ........... 40
C to +85
C
Package Thermal Resistance, Note 3
MLFTM (
JA
)
Still-Air ............................................................. 60
C/W
500 lpfm ........................................................... 54
C/W
MLFTM (
JB
) ........................................................ 33
C/W
INPUT DC ELECTRICAL CHARACTERISTICS
(Note 5)
V
CC
= 3.3V
10% or 2.5
5%; R
L
= 50
to V
CC
2V; T
A
= 40
C to 85
C, unless otherwise stated.
Symbol
Parameter
Condition
Min
Typ
Max
Units
V
OH
Output HIGH Voltage
Q0, /Q0, Q1, /Q1
V
CC
1.145
V
CC
0.895
V
V
OL
Output LOW Voltage
Q0, /Q0, Q1, /Q1
V
CC
1.945
V
CC
1.695
V
V
OUT
Output Voltage Swing
Q0, /Q0, Q1, /Q1; see Figure 1a
550
800
mV
V
DIFF_OUT
Differiential Output Voltage Swing
Q0, /Q0, Q1, /Q1; see Figure 1b
1100
1600
mV
Note 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 conditions for extended periods may affect device reliability.
Note 2.
The data sheet limits are not guaranteed if the device is operated beyond the operating ratings.
Note 3.
Thermal performance assumes exposed pad is soldered (or equivalent) to the device's most negative potential on the PCB.
Note 4.
Due to the limited drive capability, use for input of the same package only.
Note 5.
The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
Note 6.
V
IH(min.)
not lower than 1.2V.
LVPECL OUTPUT DC ELECTRICAL CHARACTERISTICS
(Note 5)
Symbol
Parameter
Condition
Min
Typ
Max
Units
V
CC
Power Supply Voltage
2.375
3.60
V
I
CC
Power Supply Current
Max. V
CC
, no load
55
80
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
1.7
V
V
DIFF_IN
Differential Input Voltage Swing
IN,/IN; see Figure 1b
0.2
3.4
V
R
IN
In to V
T
Resistance
40
50
60
IN to V
T
1.28
V
V
REF-AC
Output Reference Voltage
V
CC
1.525
V
CC
1.4 V
CC
1.325
V
4
Precision EdgeTM
SY58012U
Micrel
TIMING DIAGRAM
/IN
IN
/Q
Q
t
pd
SINGLE-ENDED AND DIFFERENTIAL SWINGS
V
IN
,
V
OUT
Typ. 800mV
Figure 1a. Single-Ended Voltage Swing
V
DIFF_IN
,
V
DIFF_OUT
Typ. 1.6V
Figure 1b. Differential Voltage Swing
V
CC
= 2.5V
5% or 3.3V
10%; T
A
= 40
C to +85
C; R
L
= 50
to V
CC
2V, unless otherwise stated.
Symbol
Parameter
Condition
Min
Typ
Max
Units
f
MAX
Maximum Operating Frequency
NRZ Data
5
Gbps
V
OUT
400mV
Clock
5
GHz
t
pd
Propagation Delay
V
IN
100mV
110
170
260
ps
t
CHAN
Channel-to-Channel Skew
Note 8
3
15
ps
t
SKEW
Part-to-Part Skew
Note 9
100
ps
t
JITTER
Data
Random Jitter (RJ)
Note 10
1
ps(rms)
Deterministic Jitter (DJ)
Note 11
10
ps(pk-pk)
Clock
Cycle-to-Cycle Jitter
Note 12
1
ps(rms)
Total Jitter (TJ)
Note 13
10
ps(pk-pk)
t
r
, t
f
Output Rise/Fall Time
20% to 80% at full output swing
35
80
110
ps
Note 7.
High frequency AC Electricals are guaranteed by design and characterization.
Note 8.
Skew is measured between outputs of the same bank under identical transitions.
Note 9.
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.
Note 10. RJ is measured with a K28.7 comma detect character pattern, measured at 10.7Gbps and 2.5Gbps/3.2Gbps.
Note 11. DJ is measured at 10.7Gbps and 2.5Gbps/3.2Gbps with both K28.5 and 2
23
1 PRBS pattern
Note 12. Cycle-to-cycle jitter definition: The variation of periods between adjacent cycles, T
n
T
n1
where T is the time between rising edges of the
output signal.
Note 13. Total jitter definition: 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 specified peak-to-peak jitter value.
AC ELECTRICAL CHARACTERISTICS
(Note 7)
5
Precision EdgeTM
SY58012U
Micrel
TYPICAL OPERATING CHARACTERISTICS
V
CC
= 3.3V, GND = 0, V
IN
= 100mV, T
A
= 25
C, unless otherwise stated.
0
1
2
3
4
5
6
7
8
9
10
-40 -20
0
20
40
60
80 100
WITHIN-DEVICE SKEW (ps)
TEMPERATURE (
C)
Within-Device Skew vs.
Temperature
155
160
165
170
175
180
185
190
0
200
400
600
800
1000
PROPAGATION DELAY (ps)
INPUT VOLTAGE SWING (V)
Propagation Delay vs.
Input Voltage Swing
135
140
145
150
155
160
165
170
175
180
185
190
195
-40 -20
0
20
40
60
80 100
PROPAGATION DELAY (ps)
TEMPERATURE (
C)
Propagaton Delay vs.
Temperature
0
100
200
300
400
500
600
700
800
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
AMPLITUDE (mV)
FREQUENCY (MHz)
Frequency vs. Amplitude
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