1
Precision Edge
SY58032U
Micrel, Inc.
M9999-072205
hbwhelp@micrel.com or (408) 955-1690
DESCRIPTION
s
Precision 1:8, LVPECL fanout buffer
s
Guaranteed AC performance over temperature and
voltage:
Clock frequency range: DC to 4GHz
<110ps t
r
/ t
f
times
<330ps t
pd
<20ps skew
s
Low-jitter performance:
<10ps
PP
total jitter (clock)
<1ps
RMS
random jitter
s
100k LVPECL compatible outputs
s
Fully differential inputs/outputs
s
Accepts an input signal as low as 100mV
s
Unique input termination and V
T
pin accepts DC-
coupled and AC-coupled differential inputs:
(LVPECL, LVDS, and CML)
s
Power supply 2.5V
5% or 3.3V
10%
s
Industrial temperature range: 40
C to +85
C
s
Available in 32-pin (5mm
5mm) MLFTM package
FEATURES
ULTRA-PRECISION 1:8 FANOUT
BUFFER WITH LVPECL OUTPUTS
AND INTERNAL TERMINATION
Precision Edge
SY58032U
APPLICATIONS
s All SONET and all GigE clock distribution
s
All Fibre Channel clock and data distribution
s
Network routing engine timing distribution
s
High-end, low-skew multiprocessor synchronous
clock distribution
Rev.: C
Amendment: /0
Issue Date:
July 2005
The SY58032U is a 2.5V/3.3V precision, high-speed, fully
differential LVPECL 1:8 fanout buffer. The SY58032U is
optimized to provide eight identical output copies with less
than 20ps of skew and less than 10ps
PP
total jitter. It can
process clock signals as fast as 4GHz.
The differential input includes Micrel's unique, 3-pin input
termination architecture that allows the SY58032U to directly
interface to LVPECL, CML, and LVDS differential signals
(AC- or DC-coupled) without any level-shifting or termination
resistor networks in the signal path. The result is a clean,
stub-free, low-jitter interface solution. The LVPECL (100k
temperature compensated) outputs feature 800mV typical
swing into 50
loads, and provide an extremely fast rise/fall
time guaranteed to be less than 110ps.
The SY58032U 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 a higher high-speed 1:8 fanout buffer, consider the
SY58031U or SY58033U. The SY58032U is part of Micrel's
high-speed, Precision Edge
product line.
All support documentation can be found on Micrel's web
site at www.micrel.com.
FUNCTIONAL BLOCK DIAGRAM
Precision Edge is a registered trademark of Micrel, Inc.
MicroLeadFrame and MLF are trademarks of Amkor Technology, Inc.
Precision Edge
Q1
/Q1
Q0
/Q0
IN
/IN
V
T
50
50
V
REF-AC
Q3
/Q3
Q2
/Q2
Q5
/Q5
Q4
/Q4
Q7
/Q7
Q6
/Q6
2
Precision Edge
SY58032U
Micrel, Inc.
M9999-072205
hbwhelp@micrel.com or (408) 955-1690
PACKAGE/ORDERING INFORMATION
Pin Number
Pin Name
Pin Function
3, 6
IN, /IN
Differential Signal Input: 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.
4
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
flexibility. See "Input Interface Applications" section.
2, 7, 17, 24
GND,
Ground. Exposed pad must be connected to a ground plane that is the same potential
Exposed Pad
as the ground pin.
1, 8, 9, 16,
VCC
Positive Power Supply: Bypass with 0.1
F
0.01
F low ESR capacitors as close to the
18, 23, 25, 32
pins as possible.
31, 30, 29, 28, 27,
Q0, /Q0, Q1, /Q1,
100k LVPECL Differential Output Pairs: Differential buffered output copy of the
26, 22, 21, 20, 19,
Q2, /Q2, Q3, /Q3,
input signal. The LVPECL output swing is typically 800mV into 50
. Unused output pairs
15, 14, 13, 12,
Q4, /Q4, Q5, /Q5,
may be left floating with no impact on jitter. See "LVPECL Output" section.
11, 10
Q6, /Q6, Q7, /Q7
5
VREF-AC
Bias Reference Voltage: Equal to V
CC
1.2V (typical), and used for AC-coupled
applications. See "Input Interface Applications" section. When using V
REF-AC
, bypass
with 0.01
F capacitor to V
CC
. Maximum sink/source current is 0.5mA.
PIN DESCRIPTION
24
23
22
21
20
19
18
17
GND
VCC
Q3
/Q3
Q4
/Q4
VCC
GND
VCC
GND
IN
VT
VREF-AC
/IN
GND
VCC
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16
32 31 30 29 28 27 26 25
/Q1
Q1
/Q0
Q0
VCC
Q2
/Q2
VCC
Q6
/Q6
Q7
/Q7
VCC
/Q5
Q5
VCC
32-Pin MLFTM (MLF-32)
Ordering Information
(1)
Package
Operating
Package
Lead
Part Number
Type
Range
Marking
Finish
SY58032UMI
MLF-32
Industrial
SY58032U
Sn-Pb
SY58032UMITR
(2)
MLF-32
Industrial
SY58032U
Sn-Pb
SY58032UMG
(3)
MLF-32
Industrial
SY58032U with
Pb-Free
Pb-Free bar-line indicator
NiPdAu
SY58032UMGTR
(2, 3)
MLF-32
Industrial
SY58032U with
Pb-Free
Pb-Free bar-line indicator
NiPdAu
Notes:
1. Contact factory for die availability. Dice are guaranteed at T
A
= 25
C, DC electricals only.
2. Tape and Reel.
3. Recommended for new designs.
3
Precision Edge
SY58032U
Micrel, Inc.
M9999-072205
hbwhelp@micrel.com or (408) 955-1690
Absolute Maximum Ratings
(1)
Power Supply Voltage (V
CC
) ...................... 0.5V to +4.0V
Input Voltage (V
IN
) ......................................... 0.5V to V
CC
Current (V
T
)
Source or sink current on V
T
pin ........................
100mA
Input Current (V
T
)
Source or sink current on IN, /IN ..........................
50mA
Current (V
REF
)
Source or sink current on V
REF-AC
(3) .......................
1.5mA
Lead Temperature Soldering, (20 sec.) .................... 260
C
Storage Temperature Range (T
S
) ........... 65
C to +150
C
Operating Ratings
(2)
Power Supply Voltage (V
CC
) ................. +2.375V to +3.60V
Ambient Temperature Range (T
A
) ............. 40
C to +85
C
Package Thermal Resistance
(4)
MLFTM (
JA
)
Still-Air ............................................................. 35
C/W
MLFTM (
JB
)
Junction-to-Board ............................................ 20
C/W
Symbol
Parameter
Condition
Min
Typ
Max
Units
V
CC
Power Supply Voltage
2.5V nominal
2.375
2.5
2.625
V
3.3V nominal
3.0
3.3
3.6
V
I
CC
Power Supply Current
V
CC
= max. No load. Includes current
190
250
mA
through 50
pull-ups.
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
V
|IN0, /IN0|, |IN1, /IN1|
R
IN
In-to-V
T
Resistance
40
50
60
V
T IN
Max. In-to-V
T
(IN, /IN)
1.28
V
V
REF-AC
V
CC
1.3 V
CC
1.2 V
CC
1.1
V
DC ELECTRICAL CHARACTERISTICS
(5)
T
A
= 40
C to +85
C
V
CC
= 2.5V
5% or 3.3V
10%; 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
V
CC
1.145
V
CC
0.895
V
V
OL
Output LOW Voltage
V
CC
1.945
V
CC
1.695
V
V
OUT
Output Voltage Swing
see Figure 1a.
500
800
mV
V
DIFF_OUT
Differential Voltage Swing
see Figure 1b.
1000
1600
2000
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 conditions 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. Due to the limited drive capability, use for input of the same package only.
4. Thermal performance assumes exposed pad is soldered (or equivalent) to the device's most negative potential (GND) on the PCB.
JB
uses 4-layer
JA
in still-air number unless otherwise stated.
5. The circuit is designed to meet the DC specifications shown in the above tables after thermal equilibrium has been established.
6. V
IH
(min) not lower than 1.2V.
LVPECL DC ELECTRICAL CHARACTERISTICS
(5)
4
Precision Edge
SY58032U
Micrel, Inc.
M9999-072205
hbwhelp@micrel.com or (408) 955-1690
SINGLE-ENDED AND DIFFERENTIAL SWINGS
V
IN
,
V
OUT
800mV (Typ.)
Figure 1a. Single-Ended Voltage Swing
V
DIFF_IN
,
V
DIFF_OUT
1.6V (Typ.)
Figure 1b. Differential Voltage Swing
V
CC
= 2.5V
5% or 3.3V
10%; R
L
= 50
to V
CC
2V; T
A
= 40
C to +85
C, unless otherwise stated.
Symbol
Parameter
Condition
Min
Typ
Max
Units
f
MAX
Maximum Operating Frequency
V
OUT
400mV
Clock
4
GHz
t
pd
Propagation Delay
(IN-to-Q)
180
260
330
ps
t
pd tempco
Differential Propagation Delay
35
fs/
C
Temperature Coefficient
t
SKEW
Output-to-Output Skew (within Device)
Note 8
7
20
ps
Part-to-Part Skew
Note 9
100
ps
t
JITTER
Clock
Cycle-to-Cycle Jitter
Note 10
1
ps
RMS
Total Jitter (Clock)
Note 11
10
ps
PP
Random Jitter (RJ)
Note 12
1
ps
RMS
t
r
, t
f
Output Rise/Fall Time
20% to 80%, at full output swing.
35
75
110
ps
Notes:
7.
High frequency AC electricals are guaranteed by design and characterization. All outputs loaded with 50
to V
CC
2V, V
IN
100mV.
8.
Output-to-output skew is measured between outputs under identical transitions.
9.
Part-to-part 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. Part-to-part skew includes variation in t
pd
.
10. 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.
11. 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.
12. Random jitter is measured with a K28.7 comma detect character pattern, measured at 1.25Gbps and 2.5Gbps.
AC ELECTRICAL CHARACTERISTICS
(7)
TIMING DIAGRAM
/IN
IN
/Q
Q
t
pd
t
pd
V
IN
V
OUT
5
Precision Edge
SY58032U
Micrel, Inc.
M9999-072205
hbwhelp@micrel.com or (408) 955-1690
TYPICAL OPERATING CHARACTERISTICS
200MHz Output
Output Swing
(200mV/div
.
)
TIME (600ps/div.)
1.25GHz Output
Output Swing
(200mV/div
.
)
TIME (100ps/div.)
0
100
200
300
400
500
600
700
800
900
0
1000
2000
3000
4000
5000
6000
7000
8000
AMPLITUDE (mV)
FREQUENCY (MHz)
Amplitude
vs. Frequency
V
IN
= 400mV
0
0.5
1
1.5
2
2.5
-60 -40 -20 0
20 40 60 80 100
SKEW (ps)
TEMPERATURE (
C)
Output-to-Output Skew
vs. Temperature
230
235
240
245
250
255
260
265
0
200
400
600
800
1000
PROPAGATION DELAY (ps)
INPUT SWING (mV)
Propagation Delay
vs. Input Swing
231.5
232
232.5
233
233.5
234
234.5
235
235.5
-60 -40 -20 0
20 40 60 80 100
PROPAGATION DELAY (ps)
TEMPERATURE (
C)
Propagation Delay
vs. Temperature
V
IN
= 800mV
4GHz Output
TIME (30ps/div.)
Output Swing
(200mV/div
.)
V
CC
= 2.5V, GND = 0, V
IN
= 100mV, T
A
= 25
C, unless otherwise stated.
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