1
Precision EdgeTM
SY58034U
Micrel
M9999-031604
hbwhelp@micrel.com or (408) 955-1690
DESCRIPTION
s
Provides six (6) ultra-low skew copies of the
selected input
s
2:1 MUX input included for clock switchover
applications
s
Guaranteed AC performance over temperature and
voltage:
Clock frequency range: DC to > 6GHz
< 290ps IN-to-OUT t
pd
< 60ps t
r
/ t
f
times
< 20ps skew (output-to-output)
s
Ultra low-jitter design:
< 1ps
rms
random jitter
< 10ps
pp
total jitter (clock)
< 1ps
rms
cycle-to-cycle jitter
< 0.7ps
rms
crosstalk-induced jitter
s
Low supply voltage operation: 2.5V and 3.3V
s
Unique input termination and V
T
pin accepts DC-
coupled and AC-coupled inputs (CML, PECL, LVDS)
s
Unique input isolation design minimizes crosstalk
s
Internal 50
output source termination
s
400mV CML output swing (R
L
= 50
)
s
40
C to +85
C temperature range
s
Available in 32-pin (5mm
5mm) MLFTM package
FEATURES
6GHz, 1:6 CML FANOUT BUFFER
w/ 2:1 MUX INPUT AND
INTERNAL I/O TERMINATION
Precision EdgeTM
SY58034U
APPLICATIONS
s Redundant clock distribution
s
All SONET/SDH clock distribution
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All Fibre Channel distribution
s
All Gigabit Ethernet clock distribution
Rev.: A
Amendment: /0
Issue Date:
March 2004
The SY58034U is a 2.5V/3.3V precision, high-speed 1:6
fanout buffer capable of handling clocks up to 6GHz. 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 50
source
terminated CML, with extremely fast rise/fall times
guaranteed to be less than 60ps.
The SY58034U 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 LVPECL outputs, consider the SY58035U or
SY58036U Multiplexers. The SY58034U is part of Micrel's
high-speed, Precision EdgeTM product line.
All support documentation can be found on Micrel's web
site at www.micrel.com.
FUNCTIONAL BLOCK DIAGRAM
Precision Edge is a trademark of Micrel, Inc.
Micro
LeadFrame and MLF are trademarks of Amkor Technology, Inc.
Precision EdgeTM
Q0
/Q0
Q1
/Q1
Q2
/Q2
Q3
/Q3
Q4
/Q4
Q5
/Q5
IN0
/IN0
V
T0
50
50
IN1
/IN1
V
T1
50
50
0
1
MUX
SEL
(TTL/CMOS)
S
V
REF-AC0
V
REF-AC1
2:1 MUX
1:6 Fanout
2
Precision EdgeTM
SY58034U
Micrel
M9999-031604
hbwhelp@micrel.com or (408) 955-1690
PACKAGE/ORDERING INFORMATION
Ordering Information
(1)
Package
Operating
Package
Part Number
Type
Range
Marking
SY58034UMI
MLF-32
Industrial
SY58034U
SY58034UMITR
(2)
MLF-32
Industrial
SY58034U
Notes:
1. Contact factory for die availability. Dice are guaranteed at T
A
= 25
C,
DC electricals only.
2. Tape and Reel.
Pin Number
Pin Name
Pin Function
1, 4
IN0, /IN0
Differential Input: These input pairs are the differential signal inputs to the device. These
8, 5
IN1, /IN1
inputs accept AC- or DC-coupled signals as small as 100mV. Each pin of a pair internally
terminates to a V
T
pin through 50
. Note that these inputs will default to an indeterminate
state if left open. Please refer to the "Input Interface Applications" section for more details.
2, 7
VT0, VT1
Input Termination Center-Tap: Each side of the differential input pair terminates to a V
T
pin. The V
T0
and V
T1
pins provide a center-tap to a termination network for maximum
interface flexibility. See "Input Interface Applications" section for more details.
31
SEL
This single-ended TTL/CMOS compatible input selects the inputs to the multiplexer. Note
that this input is internally connected to a 25k
pull-up resistor and will default to a logic
HIGH state if left open. The MUX select switchover function is asynchronous.
10
NC
No connect.
11, 16, 18,
VCC
Positive Power Supply: Bypass with 0.1
F
0.01
F low ESR capacitors.
23, 25, 30
29, 28
Q0, /Q0,
Differential Outputs: These CML output pairs are low skew output copies of the selected
27, 26
Q1, /Q1,
input. The output stage is optimized to deliver a 400mV swing (single-ended) into 50
.
22, 21
Q2, /Q2,
Each output includes a 50
source-termination resistor, thus minimizing any return
20, 19
Q3, /Q3,
reflections. Unused output pins may be left floating. Please refer to the "Truth Table"
15, 14
Q4, /Q4,
for details.
13, 12
Q5, /Q5
9, 17, 24, 32
GND,
Ground. Ground pin and exposed pad must be connected to the same ground plane.
Exposed Pad
3, 6
VREF-AC0,
Reference Voltage: This output biases to V
CC
1.2V. It is used for AC-coupling inputs
VREF-AC1
(IN, /IN). Connect V
REF-AC
directly to the V
T
pin. Bypass with 0.01
F low ESR capacitor to
V
CC
. See "Input Interface Applications" section. Maximum sink/source is
0.5mA.
PIN DESCRIPTION
1
2
3
4
5
6
7
8
24
23
22
21
20
19
18
17
9 10 11 12 13 14 15 16
32 3130 29 28 27 26 25
IN0
VT0
VREF-AC0
/IN0
/IN1
VREF-AC1
VT1
IN1
GND
VCC
Q2
/Q2
Q3
/Q3
VCC
GND
/Q0
Q0
VCC
SEL
GND
Q1
/Q1
VCC
Q5
/Q5
VCC
NC
GND
/Q4
Q4
VCC
32-Pin MLFTM (MLF-32)
TRUTH TABLE
SEL
0
IN0 Input Selected
1
IN1 Input Selected
3
Precision EdgeTM
SY58034U
Micrel
M9999-031604
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
CML Output Voltage (V
OUT
) ........... V
CC
1.0V to V
CC
+0.5V
Termination Current
(3)
Source or sink current on V
T
pin ........................
100mA
Input Current
Source or sink current on IN, /IN pin ....................
50mA
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
(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
V
CC
= 2.5V
2.375
2.5
2.625
V
V
CC
= 3.3V
3.0
3.3
3.6
V
I
CC
Power Supply Current
No load, max. V
CC
245
320
mA
R
DIFF_IN
Differential Input Resistance
80
100
120
(IN-to-/IN)
R
IN
Input Resistance (IN-to-/IN)
40
50
60
V
IH
Input HIGH Voltage (IN-to-/IN)
Note 6
V
CC
1.6
V
CC
V
V
IL
Input LOW Voltage (IN-to-/IN)
0
V
IH
0.1
V
V
IN
Input Voltage Swing (IN-to-/IN)
See Figure 1a.
0.1
1.7
V
V
DIFF_IN
Differential Input Voltage Swing
See Figure 1b.
0.2
V
(IN-to-/IN)
V
T
IN
IN to V
T
(IN-to-/IN)
1.28
V
V
REF-AC
Reference Voltage
V
CC
1.3 V
CC
1.2 V
CC
1.1
V
Notes:
1. Permanent device damage may occur if the measurements in the "Absolute Maximum Ratings" section 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 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 table after thermal equilibrium has been established.
6. V
IH
(min), not lower than 1.2V.
DC ELECTRICAL CHARACTERISTICS
(5)
T
A
= 40
C to 85
C, unless otherwise stated.
4
Precision EdgeTM
SY58034U
Micrel
M9999-031604
hbwhelp@micrel.com or (408) 955-1690
V
CC
= 2.5V
5% or 3.3V
10%; T
A
= -40
C to 85
C; R
L
= 100
across each output pair, unless otherwise stated.
Symbol
Parameter
Condition
Min
Typ
Max
Units
V
OH
Output HIGH Voltage
V
CC
0.020
V
CC
V
V
OUT
Output Voltage Swing
See Figure 1a.
325
400
mV
V
DIFF_OUT
Differential Output Voltage Swing
See Figure 1b.
650
800
mV
R
OUT
Output Source Impedance
40
50
60
CML OUTPUT DC ELECTRICAL CHARACTERISTICS
(7)
V
CC
= 2.5V
5% or 3.3V
10%; T
A
= -40
C to 85
C, unless otherwise stated.
Symbol
Parameter
Condition
Min
Typ
Max
Units
V
IH
Input HIGH Voltage
2.0
V
V
IL
Input LOW Voltage
0.8
V
I
IH
Input HIGH Current
40
A
I
IL
Input LOW Current
300
A
Note:
7. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
LVTTL/CMOS DC ELECTRICAL CHARACTERISTICS
(7)
5
Precision EdgeTM
SY58034U
Micrel
M9999-031604
hbwhelp@micrel.com or (408) 955-1690
V
CC
= 2.5V
5% or 3.3V
10%; T
A
= 40
C to 85
C, R
L
= 100
across each output pair, or equivalent, unless otherwise stated.
Symbol
Parameter
Condition
Min
Typ
Max
Units
f
MAX
Maximum Operating Frequency
Clock V
OUT
200mV
6
7.5
GHz
t
pd
Differential Propagation Delay
(IN0 or IN1-to-Q)
140
220
290
ps
(SEL-to-Q)
100
200
400
ps
t
pd
Tempco
Differential Propagation Delay
65
fs/
C
Temperature Coefficient
t
SKEW
Output-to-Output
Note 9
20
ps
Part-to-Part
Note 10
100
ps
t
JITTER
Clock
Cycle-to-Cycle Jitter
Note 11
1
ps
rms
Random Jitter (RJ)
Note 12
1
ps
rms
Total Jitter (TJ)
Note 13
10
ps
pp
Adjacent Channel
Note 14
Crosstalk-Induced Jitter
0.7
ps
rms
t
r
, t
f
Output Rise/Fall Time
Full swing, 20% to 80%
20
60
ps
Notes:
8. High frequency AC electricals are guaranteed by design and characterization.
9. Output-to-output skew is measured between outputs under identical input conditions.
10. 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.
11. 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.
12. Random jitter is measured with a K28.7 comma detect character pattern, measured at 2.5Gbps to 3.2Gbps.
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.
14. Crosstalk is measured at the output while applying two similar clock frequencies that are asynchronous with respect to each other at the inputs.
AC ELECTRICAL CHARACTERISTICS
(8)
SINGLE-ENDED AND DIFFERENTIAL SWINGS
V
IN
,
V
OUT
400mV (Typ.)
Figure 1a. Single-Ended Voltage Swing
V
DIFF_IN
,
V
DIFF_OUT
800mV (Typ.)
Figure 1b. Differential Voltage Swing
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