1
Precision Edge®
SY58037U
Micrel, IIIIInc.
M9999-010708
hbwhelp@micrel.com or (408) 955-1690
DESCRIPTION
Selects between 1 of 8 inputs, and provides two
precision, low skew CML output copies
Guaranteed AC performance over temperature and
voltage:
•DC to 5Gbps throughput
•<450ps propagation delay IN-to-Q (VIN ≥ 300mV)
•<70ps tr/ tf time
•<15ps skew (output-to-output)
Unique, patent-pending, channel-to-channel
isolation design provides superior crosstalk
performance
Ultra-low jitter design:
•<1psRMS random jitter
•<10psPP deterministic jitter
•<10psPP total jitter (clock)
•<0.7psRMS crosstalk-induced jitter
Unique, patent-pending, input termination and VT
pin accepts DC- and AC-coupled inputs (CML, PECL,
LVDS)
400mV CML output swing
50Ω source terminated outputs minimize round-trip
reflections
Power supply 2.5V ±5% or 3.3V ±10%
–40°C to +85°C temperature range
Available in 44-pin (7mm x 7mm) QFN package
FEATURES
ULTRA PRECISION 8:1 MUX
WITH INTERNAL TERMINATION
AND 1:2 CML FANOUT BUFFER
Precision Edge®
SY58037U
APPLICATIONS
All SONET/SDH data/clock applications
All Fibre Channel applications
All Gigabit Ethernet applications
Rev.: E Amendment: /0
Issue Date: January 2008
The SY58037U is a low jitter, low skew, high-speed 8:1
multiplexer with a 1:2 differential fanout buffer optimized for
precision telecom and enterprise server distribution
applications. The SY58037U distributes clock frequencies
from DC to 4GHz and data rates to 5Gpbs guaranteed over
temperature and voltage.
The SY58037U differential input includes Micrel’s unique,
3-pin input termination architecture that directly interfaces
to any differential signal (AC- or DC-coupled) as small as
100mV (200mVpp) without any level shifting or termination
resistor networks in the signal path. The outputs are 50Ω
source-terminated CML with extremely fast rise/fall time
guaranteed to be less than 70ps.
The SY58037U features a patent-pending isolation design
that significantly improves channel-to-channel crosstalk
performance.
The SY58037U operates from a 2.5V ±5% or 3.3V ±10%
supply and is guaranteed over the full industrial temperature
range of –40°C to +85°C. The SY58037U is part of Micrel’s
high-speed, Precision Edge® product line.
Datasheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Precision Edge is a registered trademark of Micrel, Inc.
Precision Edge®
Data communication systems
United States Patent No. RE44,134
2
Precision Edge®
SY58037U
Micrel, Inc.
M9999-010707
hbwhelp@micrel.com or (408) 955-1690
FUNCTIONAL BLOCK DIAGRAM
Q0
/Q0
Q1
/Q1
0
MUX
SEL0 (CMOS/TTL)
S2
8:1 MUX
1:2 Fanout
IN0
/IN0
VT0
50Ω
50Ω
VREF-AC0
S1
S0
1
2
3
4
5
6
7
IN1
/IN1
VT1
50Ω
50Ω
IN2
/IN2
VT2
50Ω
50Ω
VREF-AC1
IN3
/IN3
VT3
50Ω
50Ω
IN4
/IN4
VT4
50Ω
50Ω
VREF-AC2
IN5
/IN5
VT5
50Ω
50Ω
IN6
/IN6
VT6
50Ω
50Ω
VREF-AC3
IN7
/IN7
VT7
50Ω
50Ω
SEL1 (CMOS/TTL)
SEL3 (CMOS/TTL)
TRUTH TABLE
SEL2 SEL1 SEL0 Q /Q
L L L IN0 /IN0
L L H IN1 /IN1
L H L IN2 /IN2
L H H IN3 /IN3
H L L IN4 /IN4
H L H IN5 /IN5
H H L IN6 /IN6
H H H IN7 /IN7
3
Precision Edge®
SY58037U
Micrel
PACKAGE/ORDERING INFORMATION
Pin Number Pin Name Pin Function
20, 18, IN0, /IN0, Differential Inputs: These input pairs are the differential signal inputs to the device. Inputs accept
16, 14, IN1, /IN1, AC or DC-coupled signals as small as 100mV. Each pin of a pair internally terminates to a VT
13, 11, IN2, /IN2, pin through 50Ω. Note that these inputs will default to an indeterminate state if left open.
9, 7, IN3, /IN3, Please refer to the “Input Interface Applications” section for more details.
5, 3, IN4, /IN4,
1, 43, IN5,/IN5,
42, 40, IN6, /IN6,
38, 36 IN7, /IN7
19,15, VT0, VT1 Input Termination Center-Tap: Each side of the differential input pair terminates to a VT pin.
12, 8, VT2, VT3, The VT pins provide a center-tap to a termination network for maximum interface flexibility.
4, 44, VT4, VT5, See “Input Interface Applications” section for more details.
41, 37 VT6, VT7
17, VREF-AC0, Reference Voltage: This output biases to VCC–1.2V. It is used when AC coupling the inputs
10, VREF-AC1, (IN, /IN). For AC-coupled applications, connect VREF_AC to the VT pin and bypass with a
2 VREF-AC2, 0.01µF low ESR capacitor to VCC. See “Input Interface Applications” section for more details.
39 VREF-AC3
21, SEL0, The TTL/CMOS-compatible inputs select the inputs to the multiplexer. Note that this input is
22, SEL1, internally connected to a 25kΩ pull-up resistor and will default to a logic HIGH state if left open.
35 SEL2
24, 27, 29, 32 VCC Positive Power Supply. Bypass with 0.1µF0.01µF low ESR capacitors as close to each VCC
pin.
25, 26, Q0,/Q0, Differential Outputs: These CML output pairs are the outputs of the device. Please refer to
30, 31 Q1,/Q1 the truth table below for details. Unused output pairs may be left open. Each output is designed
to drive 400mV into 100Ω across each output pair.
23, 28, 33 GND, Ground. GND and exposed pad must both be connected to the most negative potential of chip
Exposed Pad ground.
PIN DESCRIPTION
1
2
3
4
5
6
7
8
33
32
31
30
29
28
27
26
12 13 14 15 16 17 18 19
44 43 42 41 40 39 38 37
IN5
VREF-AC2
/IN4
VT4
IN4
NC
/IN3
VT3
GND
VCC
/Q1
Q1
VCC
GND
VCC
/Q0
/IN6
VT6
IN6
/IN5
VT5
VREF-AC3
IN7
VT7
9
10
11
25
24
23
20 21 22
35
IN3
VREF-AC1
/IN2
Q0
VCC
GND
36 34
NV
SEL2
/IN7
IN1
VT1
/IN1
IN2
VT2
VREF-AC0
/IN0
VT0
SEL1
SEL0
IN0
44-Pin QFN
Ordering Information(1)
Package Operating Package Lead
Part Number Type Range Marking Finish
SY58037UMY QFN-44 Industrial SY58037U with Pb-Free
Pb-Free bar-line indicator Matte-Sn
SY58037UMYTR(2) QFN-44 Industrial SY58037U with Pb-Free
Pb-Free bar-line indicator Matte-Sn
Notes:
1. Contact factory for die availability. Dice are guaranteed at TA = 25°C, DC electricals only.
2. Tape and Reel.
4
Precision Edge®
SY58037U
Micrel
Absolute Maximum Ratings(1)
Power Supply Voltage (VCC ) ...................... –0.5V to +4.0V
Input Voltage (VIN) ......................................... –0.5V to VCC
LVPECL Output Current (IOUT)
Continuous ............................................................. 50mA
Surge .................................................................... 100mA
Termination Current(3)
Source or sink current on VT pin ........................ ±100mA
Lead Temperature (soldering, 20 sec.) ..................... 260°C
Storage Temperature Range (TS ) ........... –65°C to +150°C
Operating Ratings(2)
Power Supply Voltage (VCC) ............... +2.375V to +2.625V
............................................................ +3.0V to +3.6V
Ambient Temperature Range (TA) ............. –40°C to +85°C
Package Thermal Resistance(4)
QFN (θJA)
Still-Air ............................................................. 24°C/W
QFN (ψJB)
Junction-to-board ............................................ 12°C/W
stinUxaMpyTniMnoitidnoCretemaraPlobmyS
VCC Power Supply Voltage VCC = 2.5V. 2.375 2.5 2.625 V
VCC V6.33.30.3.V3.3 =
ICC Power Supply Current No load, max. VCC Am002541.
RIN Input Resistance (IN-to-VT060504) Ω
RDIFF_IN 02100108ecnatsiseR tupnI laitnereffiD Ω
(IN-to-/IN)
VIH VegatloV HGIH tupnI CC–1.2 VCC V
(IN-to-/IN)
VIL V0egatloV WOL tupnI IH–0.1 V
(IN-to-/IN)
VIN V7.11.0.a1 erugiF eeSgniwS egatloV tupnI
(IN-to-/IN)
VDIFF_IN V2.0.b1 erugiF eeSgniwS egatloV tupnI laitnereffiD
(IN-to-/IN)
VT_IN IN to VT(IN-to-/IN) 1.28 V
VREF-AC VegatloV ecnerefeR tuptuO CC–1.3 VCC–1.2 VCC–1.1 V
Notes:
1. Permanent device damage may occur if ratings in the “Absolute Maximum Ratings” section are exceeded. This is a stress rating only and functional
operation is not implied for 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. Package thermal resistance assumes exposed pad is soldered (or equivalent) to the device’s most negative potential on the PCB. ΨJB uses 4-layer
θJA 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.
DC ELECTRICAL CHARACTERISTICS(5)
TA=–40°C to +85°C, unless otherwise stated.
5
Precision Edge®
SY58037U
Micrel
VCC = 2.5V ±5% or 3.3V ±10%; TA=–40°C to +85°C; RL = 100Ω across each output pair, unless otherwise stated.
Symbol Parameter Condition Min Typ Max Units
VOH Output HIGH Voltage VCC–0.040 VCC–0.010 VCC V
Q, /Q
VOUT Output Differential Swing See Figure 1a. 325 400 mV
Q, /Q
VDIFF_OUT Differential Output Voltage Swing See Figure 1b. 650 800 mV
Q, /Q
ROUT Output Source Impedance 40 50 60 Ω
CML OUTPUT DC ELECTRICAL CHARACTERISTICS(7)
VCC = 2.5V ±5% or 3.3V ±10%; TA= –40°C to +85°C, unless otherwise stated.
Symbol Parameter Condition Min Typ Max Units
VIH Input HIGH Voltage 2.0 VCC V
VIL Input LOW Voltage 0.8 V
IIH Input HIGH Current –125 30 μA
IIL Input LOW Current –300 μA
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)
6
Precision Edge®
SY58037U
Micrel
VCC = 2.5V ±5% or 3.3V ±10%; TA= –40°C to +85°C, RL = 100Ω across each output pair or equivalent, unless otherwise stated.
Symbol Parameter Condition Min Typ Max Units
fMAX Maximum Operating Frequency NRZ data 5 Gbps
Clock 4 GHz
tpd Differential Propagation Delay VIN ≥ 100mV
(IN-to-Q) 240 35550 450 ps
(SEL-to-Q) 100 550 ps
Δtpd Tempco Differential Propagation Delay 215 fs/°C
Temperature Coefficient
tSKEW Output-to-Output Skew Note 9 15 ps
Part-to-Part Skew Note 10 150 ps
tJITTER Data Random Jitter (RJ) Note 11 1ps
RMS
Deterministic Jitter (DJ) Note 12 10 psPP
Clock Cycle-to-Cycle Jitter Note 13 1ps
RMS
Total Jitter (TJ) Note 14 10 psPP
Crosstalk-induced Jitter Note 15 0.7 psRMS
tr, tfOutput Rise/Fall Time At full output swing, 20% to 80%. 20 40 70 ps
Notes:
8. High-frequency AC-parameters are guaranteed by design and characterization.
9. Output-to-output skew is measured between two different outputs under identical input transitions.
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. Random jitter is measured with a K28.7 character pattern, measured at ≤fMAX.
12. Deterministic jitter is measured at 2.5Gbps/3.2Gbps, with both K28.5 and 223–1 PRBS pattern.
13. Cycle-to-cycle jitter definition: the variation of periods between adjacent cycles, Tn– Tn–1 where T is the time between rising
edges of the output signal.
14. Total jitter definition: with an ideal clock input of frequency ≤fMAX, no more than one output edge in 1012 output edges will deviate by more than the
specified peak-to-peak jitter value.
15. Crosstalk is measured at the output while applying two similar differential clock frequencies that are asynchronous with respect to each other
adjacent inputs.
AC ELECTRICAL CHARACTERISTICS(8)
7
Precision Edge®
SY58037U
Micrel
TYPICAL OPERATING CHARACTERISTICS
VCC = 3.3V, GND = 0, VIN = 100mV, TA = 25°C, unless otherwise stated.
300
400
500
600
700
800
900
0 1000 2000 3000 4000 5000
OUTPUT AMPLITUDE (mV)
FREQUENCY (MHz)
Output Amplitude
vs. Frequency
330
335
340
345
350
355
360
365
-40 -20 0 20 40 60 80 100
PROPAGATION DELAY (ps)
TEMPERATURE (°C)
Propagation Delay
vs. Temperature
0
0.2
0.4
0.6
0.8
1.0
1.2
-40-20 0 20406080100
WITHIN DEVICE SKEW (ps)
TEMPERATURE (°C)
Within Device Skew
vs. Temperature
8
Precision Edge®
SY58037U
Micrel
FUNCTIONAL CHARACTERISTICS
VCC = 3.3V, GND = 0, VIN = 100mV, TA = 25°C, unless otherwise stated.
1.25Gbps Output (Q – /Q)
TIME (200ps/div.)
Output Swing
(200mV/div.)
200MHz Output (Q – /Q)
TIME (600ps/div.)
Output Swing
(200mV/div.)
2.5Gbps Output (Q – /Q)
TIME (100ps/div.)
Output Swing
(200mV/div.)
5Gbps Output (Q – /Q)
TIME (50ps/div.)
Output Swing
(200mV/div.)
622MHz Output (Q – /Q)
TIME (100ps/div.)
Output Swing
(200mV/div.)
9
Precision Edge®
SY58037U
Micrel
SINGLE-ENDED AND DIFFERENTIAL SWINGS
VIN,
VOUT 400mV (Typ.)
Figure 1a. Single-Ended Voltage Swing
V
DIFF_IN
,
V
DIFF_OUT
800mV (Typ.)
Figure 1b. Differential Voltage Swing
INPUT AND OUTPUT STAGES
50Ω
50Ω
V
CC
GND
/IN
V
T
IN
Figure 2a. Simplified Differential
Input Stage
50Ω50Ω
V
CC
GND
Q
/Q
Z
O
= 50Ω
100mA
Z
O
= 50Ω
100Ω
Figure 2b. CML DC-Coupled
(100Ω Termination)
50Ω50Ω
V
CC
GND
Q
/Q
Z
O
= 50Ω
100mA
Z
O
= 50Ω
DC bias
per application
Figure 2c. CML AC-Coupled
(50Ω Termination)
10
Precision Edge®
SY58037U
Micrel
INPUT INTERFACE APPLICATIONS
LVPECL
IN
/IN
SY58037U
V
CC
R
pd
R
pd
For 3.3V, R
pd
= 100Ω.
For 2.5V, R
pd
= 50Ω.
GND
GND
V
T
V
REF-AC
0.01µF
V
CC
Figure 3b. LVPECL
Interface (AC-Coupled)
LVDS
IN
/IN
NC
NC
SY58037U
VCC
GND VT
VREF-AC
Figure 3e. LVDS Interface
CML
IN
/IN
NC
SY58037U
VCC
GND VT
VREF-AC
NC
Figure 3c. CML
Interface (DC-Coupled)
0.01µF
V
CC
CML
IN
/IN
SY58037U
V
CC
GND
V
T
V
REF-AC
Figure 3d. CML
Interface (AC-Coupled)
LVPECL
IN
/IN
SY58037U
VCC
0.01µF
VCC
Rpd
For VCC = 3.3V, Rpd = 50Ω.
For VCC = 2.5V, Rpd = 19Ω.
GND
VT
VREF-AC
NC
Figure 3a. LVPECL
Interface (DC-Coupled)
kniL teehS ataDnoitcnuFrebmuN traP
SY58037UUltra Precision 8:1 MUX with Internal Termination http://www.micrel.com/product-info/products/sy58037u.shtml
and 1:2 CML Fanout Buffer
SY58038UUltra Precision 8:1 MUX with Internal Termination http://www.micrel.com/product-info/products/sy58038u.shtml
and 1:2 LVPECL Fanout Buffer
SY58039UUltra Precision 8:1 MUX with Internal Termination http://www.micrel.com/product-info/products/sy58039u.shtml
and 1:2 400mV LVPECL Fanout Buffer
HBW Solutions New Products and Applications www.micrel.com/product-info/products/solutions.shtml
RELATED MICREL PRODUCTS AND SUPPORT DOCUMENTATION
Option: May connect V
T
to V
CC
.
11
Precision Edge®
SY58037U
Micrel
44-PIN QFN (QFN-44)
Package
EP- Exposed Pad
Die
CompSide Island
Heat Dissipation
Heavy Copper Plane
Heavy Copper Plane
V
EE
V
EE
Heat Dissipation
PCB Thermal Consideration for 44-Pin QFN Package
(Always solder, or equivalent, the exposed pad to the PCB)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use.
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into
the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s
use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2005 Micrel, Incorporated.
Package Notes:
1. Package meets Level 2 qualification.
2. All parts are dry-packaged before shipment.
3. Exposed pads must be soldered to a ground for proper thermal management.
