Micrel, Inc.
4.5GHz, 1:6 LVPECL FANOUT
BUFFER WITH 2:1
MUX INPUT
AND INTERNAL TERMINATION
Precision Edge
SY58035U
Precision Edge
®
SY58035U
®
FEATURES
■
Provides six ultra-low skew copies of the selected
input
■
2:1 MUX input included for clock switchover
applications
■
Guaranteed AC performance over temperature and
voltage:
•
Clock frequency range: DC to > 4.5GHz
•
<320ps IN-to-OUT t
pd
•
<110ps t
r
/ t
f
times
•
<20ps skew (output-to-output)
■
Ultra-low jitter design:
• 50fs
RMS
phase jitter (typ)
■
Low supply voltage operation: 2.5V and 3.3V
■
Unique input termination and VT pin accepts DC-
coupled and AC-coupled inputs (CML, PECL, LVDS)
■
Unique input isolation design minimizes crosstalk
■
100K LVPECL compatible output swing
■
–40°C to +85°C temperature range
■
Available in 32-pin (5mm x 5mm) MLF
®
package
Precision Edge
®
DESCRIPTION
The SY58035U is a 2.5V/3.3V precision, high-speed, 1:6
fanout capable of handling clocks up to 4.5GHz. A differential
2:1 MUX input is included for redundant clock switchover
applications.
The differential input includes Micrel’s unique, 3-pin input
termination architecture that allows the device to interface
to any differential signal (AC- or DC-coupled) as small as
100mV without any level shifting or termination resistor
networks in the signal path. The outputs are LVPECL (100K,
temperature compensated), with extremely fast rise/fall times
guaranteed to be less than 110ps.
The SY58035U operates from a 2.5V ±5% supply or a
3.3V ±10% supply and is guaranteed over the full industrial
temperature range of –40°C to +85°C. For applications that
require CML outputs, consider the SY58034U or for 400mV
LVPECL outputs the SY58036U. The SY58035U 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
■
■
■
■
Redundant clock distribution
All SONET/SDH clock/data distribution
All Fibre Channel distribution
All Gigabit Ethernet clock distribution
FUNCTIONAL BLOCK DIAGRAM
1:6 Fanout
Q0
/Q0
IN0
50Ω
V
T0
50Ω
/IN0
V
REF-AC0
IN1
50Ω
V
T1
50Ω
/IN1
V
REF-AC1
SEL
(TTL/CMOS)
1
S
0
2:1 Mux
Q1
/Q1
Q2
Mux
/Q2
Q3
/Q3
Q4
/Q4
Q5
/Q5
Precision Edge is a registered trademark of Micrel, Inc.
MicroLeadFrame
and MLF are registered trademarks of Amkor Technology, Inc.
M9999-073010
hbwhelp@micrel.com or (408) 955-1690
1
Rev.: F
Amendment: /0
Issue Date: July 2010
Micrel, Inc.
Precision Edge
®
SY58035U
PACKAGE/ORDERING INFORMATION
GND
SEL
VCC
Q0
/Q0
Q1
/Q1
VCC
Ordering Information
(1)
Part Number
Package
Type
MLF-32
MLF-32
MLF-32
MLF-32
Operating
Range
Industrial
Industrial
Industrial
Industrial
Package
Marking
SY58035U
SY58035U
SY58035U with
Pb-Free bar-line indicator
SY58035U with
Pb-Free bar-line indicator
Lead
Finish
Sn-Pb
Sn-Pb
NiPdAu
Pb-Free
NiPdAu
Pb-Free
GND
VCC
Q2
/Q2
Q3
/Q3
VCC
GND
IN0
VT0
VREF-AC0
/IN0
IN1
VT1
VREF-AC1
/IN1
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
SY58035UMI
SY58035UMITR
(2)
SY58035UMG
(3)
SY58035UMGTR
(2, 3)
Notes:
GND
NC
VCC
/Q5
Q5
/Q4
Q4
VCC
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.
32-Pin MLF
®
(MLF-32)
PIN DESCRIPTION
Pin Number
1, 4
5, 8
Pin Name
IN0, /IN0
IN1, /IN1
Pin Function
Differential Input: These input pairs are the differential signal inputs to the device. These
inputs accept AC- or DC-coupled signals as small as 100mV. Each pin of a pair internally
terminates to a VT pin through 50½. Note that these inputs will default to an indeterminate
state if left open. Please refer to the “Input Interface Applications” section for more details.
Input Termination Center-Tap: Each side of the differential input pair terminates to a VT
pin. The VT0 and VT1 pins provide a center-tap to a termination network for maximum
interface flexibility. See “Input Interface Applications” section for more details.
This single-ended TTL/CMOS-compatible input selects the inputs to the multiplexer. Note
that this input is internally connected to a 25kΩ pull-up resistor and will default to a logic
HIGH state if left open. The MUX select switchover function is asynchronous.
No connect.
Positive Power Supply: Bypass with 0.1µF || 0.01µF low ESR capacitors and place as
close to the VCC pin as possible.
Differential Outputs: These 100K (temperature compensated) LVPECL output pairs are
low skew copies of the selected input. Please refer to the “Truth Table” for details.
2, 6
31
10
11, 16, 18,
23, 25, 30
29, 28
27, 26
22, 21
20, 19
15, 14
13, 12
9, 17, 24, 32
3, 7
VT0, VT1
SEL
NC
VCC
Q0, /Q0,
Q1, /Q1,
Q2, /Q2,
Q3, /Q3,
Q4, /Q4,
Q5, /Q5
GND,
Exposed Pad
VREF-AC0
VREF-AC1
Ground: Ground pin and exposed pad must be connected to the same ground plane.
Reference Voltage: These output biases to V
CC
–1.2V. It is used for AC-coupling inputs
(IN, /IN). Connect V
REF-AC
directly to the VT pin. Bypass with 0.01µF low ESR capacitor to
V
CC
. See “Input Interface Applications” section. Maximum sink/source current is ±1.5mA.
Due to the limited drive capability, the VREF-AC pin is only intended to drive its respective
VT pin.
TRUTH TABLE
SEL
0
1
IN0 Input Selected
IN1 Input Selected
M9999-073010
hbwhelp@micrel.com or (408) 955-1690
2
Micrel, Inc.
Precision Edge
®
SY58035U
Absolute Maximum Ratings
(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
Termination Current
Source or sink current on V
T
pin......................... ±100mA
Input Current
Source or sink current on IN, /IN pin .................... ±50mA
Source or sink current on VREF-AC pin ................. ±2mA
Lead Temperature (soldering, 10 sec.) ...................... 220°C
Storage Temperature Range (T
S
) ............ –65°C to +150°C
Operating Ratings
(2)
Power Supply Voltage (V
CC
) ............... +2.375V to +2.625V
............................................................. +3.0V to +3.6V
Ambient Temperature Range (T
A
) .............. –40°C to +85°C
Package Thermal Resistance
(3)
MLF
®
(θ
JA
)
Still-Air ............................................................. 35°C/W
MLF
®
(ψ
JB
)
Junction-to-Board ............................................ 16°C/W
DC ELECTRICAL CHARACTERISTICS
(4)
T
A
= –40°C to +85°C, unless otherwise stated.
Symbol
V
CC
I
CC
Parameter
Power Supply Voltage
Power Supply Current
Differential Input Resistance
(IN-to-/IN)
Input HIGH Voltage (IN, /IN)
Input LOW Voltage (IN, /IN)
Input Voltage Swing (IN, /IN)
Differential Input Voltage Swing
|IN, /IN|
Reference Voltage
IN to V
T
(IN, /IN)
See Figure 1a
See Figure 1b
Input Resistance (IN-to-V
T
)
No load, max. V
CC
Condition
Min
2.375
3.0
90
45
V
CC
–1.2
0
0.1
0.2
1.28
V
CC
–1.3 V
CC
–1.2 V
CC
–1.1
Typ
2.5
3.3
185
100
50
Max
2.625
3.6
250
110
55
V
IH
–0.1
1.7
V
CC
Units
V
V
mA
Ω
Ω
V
V
V
mV
V
V
R
DIFF_IN
V
IL
V
IH
R
IN
V
IN
V
DIFF_IN
V
T
IN
V
REF-AC
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. Thermal performance assumes exposed pad is soldered (or equivalent) to the device’s most negative potential on the PCB. Ψ
JB
and θ
JA
are shown
for a 4-layer PCB in a still air environment, unless otherwise stated.
4. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
5. V
IH
(min) not lower than 1.2V.
M9999-073010
hbwhelp@micrel.com or (408) 955-1690
3
Micrel, Inc.
Precision Edge
®
SY58035U
LVPECL OUTPUT DC ELECTRICAL CHARACTERISTICS
(6)
V
CC
= 2.5V ±5% or 3.3V ±10%; T
A
= –40°C to +85°C; R
L
= 50Ω to V
CC
–2V, unless otherwise stated.
Symbol
Parameter
Condition
V
OH
V
OL
V
OUT
Output HIGH Voltage
Output LOW Voltage
Output Differential Swing
Differential Output Voltage Swing
See Figure 1a
See Figure 1b
Min
Typ
Max
V
CC
–1.695
V
CC
–0.895
Units
V
V
mV
V
V
CC
–1.945
550
1.1
V
CC
–1.145
800
1.6
V
DIFF_OUT
LVTTL/CMOS DC ELECTRICAL CHARACTERISTICS
(6)
V
CC
= 2.5V ±5% or 3.3V ±10%; T
A
= -40°C to 85°C, unless otherwise stated.
Symbol
Parameter
Condition
V
IH
I
IH
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
–125
–300
Min
2.0
0.8
40
Typ
Max
Units
V
V
µA
µA
V
IL
I
IL
Note:
6. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
M9999-073010
hbwhelp@micrel.com or (408) 955-1690
4
Micrel, Inc.
Precision Edge
®
SY58035U
AC ELECTRICAL CHARACTERISTICS
(7)
Symbol
f
MAX
t
pd
V
CC
= 2.5V ±5% or 3.3V ±10%; T
A
= –40°C to 85°C, R
L
= 50Ω to V
CC
–2V, unless otherwise stated.
Parameter
Condition
Maximum Operating Frequency
Differential Propagation Delay
(IN0 or IN1-to-Q)
(SEL-to-Q)
∆t
pd
Tempco
t
SKEW
t
JITTER
RMS Phase Jitter
Adjacent Channel
Crosstalk-Induced Jitter
t
r
, t
f
Notes:
7. High frequency AC electricals are guaranteed by design and characterization.
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.
10. Crosstalk is measured at the output while applying two similar clock frequencies that are asynchronous with respect to each other at the inputs.
Min
4.5
170
100
Typ
5.5
240
220
70
Max
320
400
Units
GHz
ps
ps
fs/°C
V
OUT
≥ 400mV
Differential Propagation Delay
Temperature Coefficient
Output-to-Output
Part-to-Part
Note 8
Note 9
Output: 622MHz
Integration Range: 12kHz to 20MHz
Note 10
Full Swing, 20% to 80%
20
100
50
0.7
35
110
ps
ps
fs
ps
rms
ps
Output Rise/Fall Time
PHASE NOISE
0
-10
-20
-30
-40
-50
NOISE POWER (dBc/Hz)
RMS Phase Jitter (Random)
12kHz to 20MHz: 50fs (Typical)
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
-200
10
100
1K
10K
100K
1M
10M
100M
OFFSET FREQUENCY (Hz)
Phase Noise Plot: 622MHz @ 3.3V
M9999-073010
hbwhelp@micrel.com or (408) 955-1690
5
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