Micrel, Inc.
Precision Edge
ULTRA-PRECISION 1:8 FANOUT
SY58033U
Precision Edge
®
bUFFER WITH 400mV LVPECL OUTPUTS
SY58033U
AND INTERNAL TERMINATION
®
FEATURES
■
Precision 1:8, 400mV LVPECL fanout buffer
■
Guaranteed AC performance over temperature and
voltage:
• Clock frequency range: DC to 5.5GHz
• <80ps t
r
/ t
f
times
• <280ps t
pd
• <20ps skew
■
Low-jitter performance:
• 76fs
RMS
phase jitter (typ)
■
100k LVPECL compatible outputs
■
Fully differential inputs/outputs
■
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)
■
Power supply 2.5V ±5% or 3.3V ±10%
■
Industrial temperature range: –40°C to +85°C
■
Available in 32-pin (5mm x 5mm) MLF
®
Package
Precision Edge
®
DESCRIPTION
The SY58033U is a 2.5V/3.3V precision, high-speed, fully
differential 400mV LVPECL 1:8 fanout buffer. The SY58033U
is optimized to provide eight identical output copies with
less than 20ps of skew and only 76fs
RMS
phase jitter. It can
process clock signals as fast as 5.5GHz.
The differential input includes Micrel’s unique, 3-pin
input termination architecture that allows the SY58033U to
directly interface to LVPECL, CML, and LVDS differential
signal (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 solution. The LVPECL (100k
temperature compensated) outputs feature a 400mV typical
swing into 50½ loads, and provide an extremely fast rise/fall
time guaranteed to be less than 80ps.
The SY58033U 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). Other high-speed 1:8
fanout buffers include the CML SY58031U and the 800mV
LVPECL SY58032U. The SY58033U 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.
APPLICATIONS
■
■
■
■
All SONET and all GigE clock distribution
All Fibre Channel clock and data distribution
Network routing engine timing distribution
High-end, low-skew multiprocessor synchronous
clock distribution
FUNCTIONAL bLOCk DIAGRAM
Q0
/Q0
Q1
/Q1
Q2
/Q2
IN
50Ω
V
T
50Ω
/IN
Q3
/Q3
Q4
/Q4
Q5
/Q5
Q6
/Q6
Q7
V
REF-AC
Precision Edge is a registered trademark of Micrel, Inc.
MicroLeadFrame
and MLF are registered trademarks of Amkor Technology, Inc.
M9999-072810
hbwhelp@micrel.com or (408) 955-1690
/Q7
Rev.: E
Amendment: /0
1
Issue Date: July 2010
Micrel, Inc.
Precision Edge
®
SY58033U
PACkAGE/ORDERING INFORMATION
VCC
Q0
/Q0
Q1
/Q1
Q2
/Q2
VCC
Ordering Information
(1)
GND
VCC
Q3
/Q3
Q4
/Q4
VCC
GND
VCC
GND
IN
VT
VREF-AC
/IN
GND
VCC
32 31 30 29 28 27 26 25
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16
24
23
22
21
20
19
18
17
Part Number
SY58033UMI
SY58033UMITR
(2)
SY58033UMG
(3)
SY58033UMGTR
(2, 3)
Package
Type
MLF-32
MLF-32
MLF-32
MLF-32
Operating
Range
Industrial
Industrial
Industrial
Industrial
Package
Marking
SY58033U
SY58033U
SY58033U with
Pb-Free bar-line indicator
SY58033U with
Pb-Free bar-line indicator
Lead
Finish
Sn-Pb
Sn-Pb
Pb-Free
NiPdAu
Pb-Free
NiPdAu
VCC
/Q7
Q7
/Q6
Q6
/Q5
Q5
VCC
32-Pin MLF
®
(MLF-32)
Notes:
1. Contact factory for die availability. Dice are guaranteed at T
A
= 25°C, DC electricals only.
2. Tape and Reel.
3. Pb-Free package recommended for new designs.
PIN DESCRIPTION
Pin Number
3, 6
Pin Name
IN, /IN
Pin Function
Differential Signal Input: Each pin of this pair internally terminates with 50½ 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.
Ground. Exposed pad must be connected to a ground plane that is the same potential
as the ground pin.
Positive Power Supply: Bypass with 0.1µF||0.01µF low ESR capacitors as close to the
pins as possible.
400mV LVPECL Differential Output Pairs: Differential buffered output copy of the
input signal. The LVPECL output swing is typically 400mV into 50Ω. Unused
output pairs may be left floating with no impact on jitter. See “LVPECL Output” section.
Bias Reference Voltage: Equal to V
CC
–1.2V (approx.), and used for AC-coupled
applications. See “Input Interface Applications” section. When using V
REF-AC
, bypass
with 0.01µF capacitor to V
CC
. Maximum sink/source current is 0.5mA.
4
2, 7, 17, 24
1, 8, 9, 16,
18, 23, 25, 32
31, 30, 29, 28, 27,
26, 22, 21, 20, 19,
15, 14, 13, 12,
11, 10
5
VT
GND,
Exposed Pad
VCC
Q0, /Q0, Q1, /Q1,
Q2, /Q2, Q3, /Q3
Q4, /Q4, Q5, /Q5,
Q6, /Q6, Q7, /Q7
VREF-AC
M9999-072810
hbwhelp@micrel.com or (408) 955-1690
2
Micrel, Inc.
Precision Edge
®
SY58033U
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)
MLF
®
(θ
JA
)
Still-Air ............................................................. 35°C/W
MLF
®
(ψ
JB
)
Junction-to-Board ............................................ 20°C/W
DC ELECTRICAL CHARACTERISTICS
(5)
T
A
= –40°C to +85°C.
Symbol
Parameter
V
CC
I
CC
V
IL
V
IH
Power Supply Voltage
Power Supply Current
Input HIGH Voltage
Input LOW Voltage
Input Voltage Swing
Differential Input Voltage Swing
|IN0, /IN0|, |IN1, /IN1|
In-to-V
T
Resistance
Max. In-to-V
T
(IN, /IN)
Condition
2.5V nominal
3.3V nominal
V
CC
= max. No. load includes current
through 50Ω pull-ups.
IN, /IN, Note 6
IN, /IN
IN, /IN, see Figure 1a.
IN, /IN, see Figure 1b.
Min
2.375
3.0
V
CC
–1.6
0
0.1
0.2
40
50
60
1.28
V
CC
–1.3 V
CC
–1.2 V
CC
–1.1
Typ
2.5
3.3
180
Max
2.625
3.6
250
V
IH
–0.1
1.7
V
CC
Units
V
V
mA
V
V
V
V
Ω
V
V
V
IN
V
DIFF_IN
R
IN
V
T IN
V
REF-AC
LVPECL DC ELECTRICAL CHARACTERISTICS
(5)
V
CC
= 2.5V ±5% or 3.3V ±10%; R
L
= 50½ to V
CC
–2V; T
A
= –40°C to +85°C unless otherwise stated
Symbol
Parameter
Condition
V
OH
V
OL
V
OUT
Output HIGH Voltage
Output LOW Voltage
Output Voltage Swing
Differential Voltage Swing
see Figure 1a.
see Figure 1b.
Min
Typ
Max
V
CC
–0.895
400
800
V
CC
–1.295
Units
V
V
mV
mV
V
CC
–1.545
150
300
V
CC
–1.145
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” 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. ψ
JB
uses 4-layer
θ
JA
in still-air number unless otherwise stated.
5. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
6. V
IH
(min) not lowers than 1.2V.
M9999-072810
hbwhelp@micrel.com or (408) 955-1690
3
Micrel, Inc.
Precision Edge
®
SY58033U
AC ELECTRICAL CHARACTERISTICS
(7)
Symbol
t
pd
f
MAX
t
pd
tempco
t
SKEW
t
JITTER
t
r
, t
f
Notes:
7.
8.
Output-to-output skew is measured between outputs under identical conditions.
High frequency AC electricals are guaranteed by design and characterization. All outputs loaded with 50½ to V
CC
–2V, V
IN
ž 100mV.
V
CC
= 2.5V ±5% or 3.3V ±10%; R
L
= 50½ to V
CC
–2V; T
A
= –40°C to +85°C, unless otherwise stated.
Parameter
Condition
Maximum Operating Frequency
Propagation Delay
(IN-to-Q)
Differential Propagation Delay
Temperature Coefficient
Output-to-Output Skew(within device)
Part-to-Part Skew
RMS Phase Jitter
Output Rise/Fall Time
Note 8
Note 9
Output = 622MHz
Integration Range 12kHz - 20MHz
20% to 80%, at full output swing.
V
OUT
≥ 200mV
Min
5.5
130
Typ
200
35
7
Max
280
Units
GHz
ps
fs/°C
Clock
20
100
ps
ps
fs
76
20
50
80
ps
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 respec-
tive inputs. Part-to-part skew includes variation in t
pd
.
PHASE NOISE
RMS Phase Jitter (Random)
12kHz to 20MHz = 76fs (Typical)
Phase Noise Plot: 622MHz @ 3.3V
M9999-072810
hbwhelp@micrel.com or (408) 955-1690
4
Micrel, Inc.
Precision Edge
®
SY58033U
SINGLE-ENDED AND DIFFERENTIAL SWINGS
V
IN
,
V
OUT
400mV (Typ.)
V
DIFF_IN
,
V
DIFF_OUT
800mV (Typ.)
Figure 1a. Single-Ended Voltage Swing
Figure 1b. Differential Voltage Swing
TIMING DIAGRAM
/IN
IN
t
PD
/Q
Q
V
OUT
t
PD
V
IN
M9999-072810
hbwhelp@micrel.com or (408) 955-1690
5
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