Micrel, Inc.
ULTRA-PRECISION 1:8 FANOUT
bUFFER
WITH LVPECL
OUTPUTS
AND INTERNAL TERMINATION
Precision Edge
SY58032U
Precision Edge
®
SY58032U
®
FEATURES
■
Precision 1:8, LVPECL fanout buffer
■
Guaranteed AC performance over temperature and
voltage:
• Clock frequency range: DC to 4GHz
• <110ps t
r
/ t
f
times
• <330ps 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 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 only 76fs
RMS
phase 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 50½ 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.
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
/IN
V
REF-AC
50Ω
Q3
/Q3
Q4
/Q4
Q5
/Q5
Q6
/Q6
United States Patent No. RE44,134
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
/Q7
1
Rev.: E
Amendment: /0
Issue Date: July 2010
Micrel, Inc.
Precision Edge
®
SY58032U
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
SY58032UMI
SY58032UMITR
(2)
SY58032UMG
(3)
SY58032UMGTR
(2, 3)
Package
Type
MLF-32
MLF-32
MLF-32
MLF-32
Operating
Range
Industrial
Industrial
Industrial
Industrial
Package
Marking
SY58032U
SY58032U
SY58032U with
Pb-Free bar-line indicator
SY58032U with
Pb-Free bar-line indicator
Lead
Finish
Sn-Pb
Sn-Pb
Pb-Free
NiPdAu
Pb-Free
NiPdAu
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.
100k LVPECL Differential Output Pairs: Differential buffered output copy of the
input signal. The LVPECL output swing is typically 800mV 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 (typical), 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
VCC
/Q7
Q7
/Q6
Q6
/Q5
Q5
VCC
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
®
SY58032U
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
IH
V
IL
V
IN
V
DIFF_IN
R
IN
V
T IN
V
REF-AC
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 50½ pull-ups.
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
60
1.28
V
CC
–1.3 V
CC
–1.2 V
CC
–1.1
Min
2.375
3.0
Typ
2.5
3.3
190
Max
2.625
3.6
250
V
CC
V
IH
–0.1
1.7
Units
V
V
mA
V
V
V
V
Ω
V
V
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
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 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 tables after thermal equilibrium has been established.
6. V
IH
(min) not lower than 1.2V.
Parameter
Output HIGH Voltage
Output LOW Voltage
Output Voltage Swing
Differential Voltage Swing
Condition
Min
V
CC
–1.145
V
CC
–1.945
Typ
Max
V
CC
–0.895
V
CC
–1.695
Units
V
V
mV
mV
see Figure 1a.
see Figure 1b.
500
1000
800
1600
2000
M9999-072810
hbwhelp@micrel.com or (408) 955-1690
3
Micrel, Inc.
Precision Edge
®
SY58032U
AC ELECTRICAL CHARACTERISTICS
(7)
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
f
MAX
t
pd
t
pd tempco
t
SKEW
t
JITTER
t
r
, t
f
Notes:
7.
8.
High frequency AC electricals are guaranteed by design and characterization. All outputs loaded with 50½ to V
CC
– 2V, V
IN
≥ 100mV.
Output-to-output skew is measured between outputs under identical transitions.
Parameter
Maximum Operating Frequency
Propagation Delay
(IN-to-Q)
Differential Propagation Delay
Temperature Coefficient
Part-to-Part Skew
RMS Phase Jitter
Output Rise/Fall Time
Condition
V
OUT
≥ 400mV
Clock
Min
4
180
Typ
260
35
7
Max
330
Units
GHz
ps
fs/°C
Note 8
Note 9
Output = 622MHZ
Integration Ranger 12kHz - 20MHz
20% to 80%, at full output swing.
Output-to-Output Skew
(within Device)
20
100
ps
ps
fs
76
35
75
110
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
®
SY58032U
SINGLE-ENDED AND DIFFERENTIAL SWINGS
V
IN
,
V
OUT
800mV (Typ.)
V
DIFF_IN
,
V
DIFF_OUT
1.6V (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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