SY69753AL
3.3V, 125Mbps, 155Mbps Clock
and Data Recovery
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
August 2007
M9999-082107-E
hbwhelp@micrel.com or (408) 955-1690
General Description
The SY69753AL is a complete Clock Recovery and
Data Retiming integrated circuit for OC-3/STS-3
applications at 155Mbps NRZ. The device is ideally
suited for SONET/SDH/ATM applications and other
high-speed data transmission systems.
Clock recovery and data retiming is performed by
synchronizing the on-chip VCO directly to the incoming
data stream. The VCO center frequency is controlled by
the reference clock frequency and the selected divide
ratio. On-chip clock generation is performed through the
use of a frequency multiplier PLL with a byte rate source
as reference.
The SY69753AL also includes a link fault detection
circuit.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• 3.3V power supply
• SONET/SDH/ATM compatible
• Clock and data recovery for 125Mbps/155Mbps NRZ
data stream
• Two on-chip PLLs: one for clock generation and
another for clock recovery
• Selectable reference frequencies
• Differential PECL high-speed serial I/O
• Line receiver input: no external buffering needed
• Link fault indication
• 100k ECL compatible I/O
• Industrial temperature range (–40°C to +85°C)
• Lower power: fully compatible with Micrel’s
SY87701V, but with 30% less power
• Available in 32-pin EPAD-TQFP
Applications
• Ethernet media converter(m)
• SONET/SDH/ATM OC-3
• Proprietary architecture at 120Mbps to 180Mbps
Micrel, Inc. SY69753AL
August 2007
2 M9999-082107-E
hbwhelp@micrel.com or (408) 955-1690
Ordering Information(1)
Part Number Package
Type Operating
Range Package
Marking Lead
Finish
SY69753ALHG H32-1 Industrial SY69753ALHG with
Pb-Free bar-line indicator
NiPdAu
Pb-Free
SY69753ALHGTR
(2)
H32-1 Industrial SY69753ALHG with
Pb-Free bar-line indicator
NiPdAu
Pb-Free
Notes:
1. Contact factory for die availability. Dice are guaranteed at T
A
= 25°C, DC Electricals only.
2. Tape and Reel.
Pin Configur ation
32-Pin EPAD-TQFP (H32-1)
Micrel, Inc. SY69753AL
August 2007
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hbwhelp@micrel.com or (408) 955-1690
Pin Description
Inputs
Pin Number Pin Name Type Pin Name
2
3
RDINP
RDINN
Differential
PECL
Serial Data Input: These built-in line receiver inputs are connected to the differential receive
serial data stream. An internal receive PLL recovers the embedded clock (RCLK) and data
(RDOUT) information.
5 REFCLK TTL Input
Reference Clock: This input is used as the reference for the internal frequency synthesizer
and the "training" frequency for the receiver PLL to keep it centered in the absence of data
coming in on the RDIN inputs.
26 CD PECL Input
Carrier Detect: This input controls the recovery function of the Receive PLL and can be driven
by the carrier detect output of optical modules or from external transition detection circuitry.
When this input is HIGH, the input data stream (RDIN) is recovered normally by the Receive
PLL. When this input is LOW the data on the inputs RDIN will be internally forced to a
constant LOW, the data outputs RDOUT will remain LOW, the Link Fault Indicator output
LFIN forced LOW and the clock recovery PLL forced to look onto the clock frequency
generated from REFCLK.
32
25
DIVSEL1
DIVSEL2
TTL Input Divider Select: These inputs select the ratio between the output clock frequency
(RCLK/TCLK) and the REFCLK input frequency as shown in the “Reference Frequency
Selection” table.
16 CLKSEL TTL Input
Clock Select: This input is used to select either the recovered clock of the receiver PLL
(CLKSEL = HIGH) or the clock of the frequency synthesizer (CLKSEL = LOW) to the TCLK
outputs.
Outputs
Pin Number Pin Name Type Pin Name
31 LFIN TTL Output
Link Fault Indicator: This output indicates the status of the input data stream RDIN. Active
HIGH signal is indicating when the internal clock recovery PLL has locked onto the incoming
data stream. LFIN will go HIGH if CD is HIGH and RDIN is within the frequency range of the
Receive PLL (1000ppm) and will be alternating if not. LFIN is an asynchronous output.
23
24
RDOUTN
RDOUTP
Differential
PECL
Receive Data Output: These ECL 100K outputs represent the recovered data from the input
data stream (RDIN). This recovered data is specified against the rising edge of RCLK.
20
21
RCLKN
RCLKP
Differential
PECL
Clock Output: These ECL 100K outputs represent the recovered clock used to sample the
recovered data (RDOUT).
18
17
TCLKP
TCLKN
Differential
PECL
Clock Output: These ECL 100K outputs represent either the recovered clock (CLKSEL =
HIGH) used to sample the recovered data (RDOUT) or the transmit clock of the frequency
synthesizer (CLKSEL = LOW).
9
10
PLLSP
PLLSN
Clock Synthesis PLL Loop Filter: External loop filter pins for the clock synthesis PLL.
14
15
PLLRN
PLLRP
Clock Recovery PLL Loop Filter: External loop filter pins for the receiver PLL.
Power and Ground
Pin Number Pin Name Type Pin Name
27, 28 VCC Power Supply.
(1)
29
30
VCCA Analog Power Supply Voltage.
(1)
19, 22 VCCO Output Supply Voltage.
(1)
12, 13 GND Ground.
1, 4, 6, 7, 8 NC No connect.
11 GNDA Analog Ground.
Note:
1. VCC, VCCA, VCCO must be the same value.
Micrel, Inc. SY69753AL
August 2007
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Absolute Maximum Ratings(1)
Supply Voltage (V
CC
) ................................... -0.5V to +5.0V
Input Voltage (V
IN
) ........................................... -0.5V to V
CC
Output Current (I
OUT
)
Continuous........................................................ ±50mA
Surge ..............................................................±100mA
Lead Temperature (soldering, 20sec.) ................... +260°C
Storage Temperature (T
s
) ........................-65°C to +150°C
Operating Ratings(2)
Input Voltage (V
CC
)............................ +3.15V to +3.45V
Ambient Temperature (T
A
) ................... –40°C to +85°C
Junction Temperature (T
J
) ................................ +125°C
Package Thermal Resistance
(3)
EPAD-TQFP (θ
JA
)
Still-air
(4)
................................................. 28°C/W
500lfpm
(4)
............................................... 20°C/W
EPAD-TQFP (θ
JC
)........................................... 4°C/W
DC Electrical Characteristics
T
A
= –40°C to +85°C, unless otherwise noted.
Symbol Parameter Condition Min Typ Max Units
V
CC
Power Supply Voltage 3.15 3.3 3.45 V
I
CC
Power Supply Current 120 160 mA
PECL 100K DC Electrical Characteristics
V
CC
= V
CCO
= V
CCA
= 3.3V ±5%; T
A
= –40°C to +85°C, unless otherwise noted.
Symbol Parameter Condition Min Typ Max Units
V
IH
Input HIGH Voltage V
CC
-1.165 V
CC
-0.880 V
V
IL
Input LOW Voltage V
CC
-1.810 V
CC
-1.475 V
V
OH
Output HIGH Voltage 50Ω to V
CC
-2V V
CC
-1.075 V
CC
-0.830 V
V
OL
Output LOW Voltage 50Ω to V
CC
-2V V
CC
-1.860 V
CC
-1.570 V
I
IL
Input LOW Current V
IN
= V
IL
(Min) 0.5 µA
TTL DC Electrical Characteristics
V
CC
= V
CCO
= V
CCA
= 3.3V ±5%; T
A
= –40°C to +85°C, unless otherwise noted.
Symbol Parameter Condition Min Typ Max Units
V
IH
Input HIGH Voltage 2.0 V
CC
V
V
IL
Input LOW Voltage 0.8 V
V
OH
Output HIGH Voltage I
OH
= -0.4mA 2.0 V
V
OL
Output LOW Voltage I
OL
= 4mA 0.5 V
I
IH
Input HIGH Current V
IN
= 2.7V, V
CC
= Max.
V
IN
= V
CC
, V
CC
= Max.
-125
+100
µA
µA
I
IL
Input LOW Voltage V
IN
= 0.5V, V
CC
= Max. -300 µA
I
OS
Output Short Circuit Current V
OUT
= 0V, (max., 1 sec.) -15 -100 mA
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 rating 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. Airflow of 500lfpm recommended for 28-pin SOIC.
4. Using JEDEC standard test boards with die attach pad soldered to PCB. See www.amkor.com for additional package details.
Micrel, Inc. SY69753AL
August 2007
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hbwhelp@micrel.com or (408) 955-1690
AC Electrical Characteristics
V
CC
= V
CCO
= V
CCA
= 3.3V ±5%; T
A
= –40°C to +85°C, unless otherwise noted.
Symbol Parameter Condition Min Typ Max Units
f
VCO
VCO Center Frequency f
REFCLK
x Byte Rate 720 1250 MHz
∆f
VCO
VCO Center Frequency
Tolerance
Nominal 5 %
t
ACQ
Acquisition Lock Time 50Ω to V
CC
-2V 15 µs
t
CPWH
REFCLK Pulse Width HIGH 50Ω to V
CC
-2V 4 ns
t
CPWL
REFCLK Pulse Width LOW V
IN
= V
IL
(Min) 4 ns
t
ir
REFCLK Input Rise Time 0.5 2 ns
t
ODC
Output Duty Cycle (RCLK/TCLK) 45 55 % of
UI
t
r
, t
f
ECL Output Rise/Fall Time
(20% to 80%)
50Ω to V
CC
-2 100 400 ps
t
SKEW
Recovered Clock Skew -200 +200 ps
t
DV
Data Valid 1/(2xf
RCLK
) -200 ps
t
DH
Data Hold 1/(2xf
RCLK
) -200 ps
Timing Waveforms
Micrel, Inc. SY69753AL
August 2007
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hbwhelp@micrel.com or (408) 955-1690
Functional Block
Functional Description
Clock Recovery
Clock Recovery, as shown in the block diagram,
generates a clock that is at the same frequency as the
incoming data bit rate at the Serial Data input. The
clock is phase aligned by a PLL so that it samples the
data in the center of the data eye pattern.
The phase relationship between the edge transitions
of the data and those of the generated clock are
compared by a phase/frequency detector. Output
pulses from the detector indicate the required
direction of phase correction. These pulses are
smoothed by an integral loop filter. The output of the
loop filter controls the frequency of the Voltage
Controlled Oscillator (VCO), which generates the
recovered clock.
Frequency stability, without incoming data, is
guaranteed by an alternate reference input (REFCLK)
that the PLL locks onto when data is lost. If the
Frequency of the incoming signal varies by greater
than approximately 1000ppm with respect to the
synthesizer frequency, the PLL will be declared out of
lock, and the PLL will lock to the reference clock.
The loop filter transfer function is optimized to enable
the PLL to track the jitter, yet tolerate the minimum
transition density expected in a received SONET data
signal. This transfer function yields a 30µs data
stream of continuous 1's or 0's for random incoming
NRZ data.
Lock Detect
The SY69753AL contains a link fault indication circuit,
which monitors the integrity of the serial data inputs. If
the received serial data fails the frequency test, then
the PLL will be forced to lock to the local reference
clock. This will maintain the correct frequency of the
recovered clock output under loss of signal or loss of
lock conditions. If the recovered clock frequency
deviates from the local reference clock frequency by
more than approximately 1000ppm, the PLL will be
declared out of lock. The lock detect circuit will poll the
input data stream in an attempt to reacquire lock to
data. If the recovered clock frequency is determined to
be within approximately 1000ppm, the PLL will be
declared in lock and the lock detect output will go
active.
During the interval when the CDR is not locked onto
the RDIN input, the LFIN output will not be a static
LOW, but will be changing.
.
Micrel, Inc. SY69753AL
August 2007
7 M9999-082107-E
hbwhelp@micrel.com or (408) 955-1690
Loop Filter Components(1)
R1 = 350Ω
C1 = 1.0µF (X7R Dielectric)
R2 = 680Ω
C2 = 1.0µF (X7R Dielectric)
Note:
1. Suggested values. Values may vary for different applications.
Reference Frequency Selection
DIVSEL1 DIVSEL2 f
RCLK
/f
REFCLK
0 0 8
0 1 10
1 0 16
1 1 20
Micrel, Inc. SY69753AL
August 2007
8 M9999-082107-E
hbwhelp@micrel.com or (408) 955-1690
Application Example AC-Coupled I/O
Micrel, Inc. SY69753AL
August 2007
9 M9999-082107-E
hbwhelp@micrel.com or (408) 955-1690
Application Example DC-Coupled I/O
Related Product an d Support Documentation
Part Number Function Data Sheet Link
SY87701AL Low-Power 3.3V, 28Mbps to 1300Mbps AnyRate
®
Clock and Data Recovery
www.micrel.com/product-info/products/sy87701al.shtml
HBW Solutions New Products and Applications www.micrel.com/product-info/products/solutions.shtml
Micrel, Inc. SY69753AL
August 2007
10 M9999-082107-E
hbwhelp@micrel.com or (408) 955-1690
Bill of Materials (AC-Coupled)
Item Part Number Manufacturer Description Qty.
C6 293D685X0025B2T Vishay
(1)
6.8µF, 25V, Tantalum Capacitor, Size B 1
C7 VJ206Y103JXJAT Vishay
(1)
0.01µF Ceramic Capacitor, Size 1206, X7R Dielectric 1
C10, C11 VJ0603Y105JXJAT Vishay
(1)
1.0µF Ceramic Capacitor, Size 0603, X7R Dielectric 2
C12-C15,
C18, C19,
C27, C28
VJ0402Y104JXJAT Vishay
(1)
0.1µF Ceramic Capacitor, Size 0402, X7R Dielectric 8
C20-C26 VJ0402Y104JXJAT Vishay
(1)
0.01µF Ceramic Capacitor, Size 1206, X7R Dielectric 7
D1 P301-ND Panasonic
(2)
LED Diode, T-1 3/4, Red Clear 1
D2 P300-ND/P301-ND Vishay
(1)
T-1 3/4, Red LED 1
J2, J3, J4,
J6
111-0702-001 Johnson
Components
(3)
Red, Insulated Thumb Nut Binding Post
(Jumped Together)
4
J5 BLM21A102F Murata
(4)
Black, Insulated Thumb Nut Binding Post, GND
(Jumped to V
EE
)
1
Q1 459-2598-5-ND NTE
(5)
2N2222A Buffer/Driver Transistor, NPN 1
R1 CRCW04023500F Vishay
(1)
350Ω Resistor, 2%, Size 0402 1
R2 CRCW04026800F Vishay
(1)
680Ω Resistor, 2%, Size 0402 1
R3, R8,
R9, R10
CRCW04021001F Vishay
(1)
1kΩ Pull-up Resistor, 2%, Size 1206 4
R11-R16,
R28-R30,
R32
CRCW04021820F Vishay
(1)
182Ω Resistor, 2%, Size 0402 10
R21 CRCW06031300F Vishay
(1)
130Ω Resistor, 2%, Size 0603 1
R22 CRCW04021820F Vishay
(1)
12.1kΩ Resistor, 2%, Size 1206 1
R23, R24 CRCW04022825F Vishay
(1)
82Ω Resistor, 2%, Size 0402 2
R25, R26 CRCW04021300F Vishay
(1)
130Ω Resistor, 2%, Size 0402 2
R27 CRCW0402OOR0F Vishay
(1)
0Ω Resistor, 2%, Size 0402 1
R31 CRCW04025000F Vishay
(1)
50Ω Resistor, 2%, Size 0402 1
SMA1-
SMA10
142-0701-851 Johnson
Components
(3)
End Launch SMA Jack 10
SP1-SP6 Solder Jump Option 6
SW1 CT2068-ND CTS
(6)
8-Position, Top Actuated Slide Dip Switch 1
U1 SY69753AL Micrel, Inc.
(7)
Low-Power 3.3V 125Mbp s to 155Mbps Clock and
Data Recovery 1
U2 SY89322V Micrel, Inc.
(7)
3.3/5V Dual LVTTL/LVCMOS-to-Differential LVPECL
Translator 1
Notes:
1. Vishay: www.vishay.com.
2. Panasonic: www.panasonic.com.
3. Johnson Components: www.johnson-components.com.
4. Murata: www.murata.com.
5. NTE: www.nte.com.
6. CTS: www.cts.com.
7. Micrel, Inc: www.micrel.com.
Micrel, Inc. SY69753AL
August 2007
11 M9999-082107-E
hbwhelp@micrel.com or (408) 955-1690
Bill of Materials (DC-Coupled)
Item Part Number Manufacturer Description Qty.
C6 293D685X0025B2T Vishay
(1)
6.8µF, 25V, Tantalum Capacitor, Size B 1
C7 VJ206Y103JXJAT Vishay
(1)
0.01µF Ceramic Capacitor, Size 1206, X7R Dielectric 1
C10, C11 VJ0603Y105JXJAT Vishay
(1)
1.0µF Ceramic Capacitor, Size 0603, X7R Dielectric 2
C12-C15,
C18, C19,
C27, C28
VJ0402Y104JXJAT Vishay
(1)
0.1µF Ceramic Capacitor, Size 0402, X7R Dielectric 8
C20-C26 VJ0402Y104JXJAT Vishay
(1)
0.01µF Ceramic Capacitor, Size 1206, X7R Dielectric 7
D1 P301-ND Panasonic
(2)
LED Diode, T-1 3/4, Red Clear 1
D2 P300-ND/P301-ND Vishay
(1)
T-1 3/4, Red LED 1
J2, J3, J4,
J6
111-0702-001 Johnson
Components
(3)
Red, Insulated Thumb Nut Binding Post
(Jumped Together)
4
J5 BLM21A102F Johnson
Components
(3)
Black, Insulated Thumb Nut Binding Post, GND
(Jumped to V
EE
)
1
Q1 459-2598-5-ND NTE
(5)
2N2222A Buffer/Driver Transistor, NPN 1
R1 CRCW04023500F Vishay
(1)
350Ω Resistor, 2%, Size 0402 1
R2 CRCW04026800F Vishay
(1)
680Ω Resistor, 2%, Size 0402 1
R3, R8,
R9, R10
CRCW04021001F Vishay
(1)
1kΩ Pull-up Resistor, 2%, Size 1206 4
R15, R16,
R30, R32
CRCW04021820F Vishay
(1)
182Ω Resistor, 2%, Size 0402 10
R21 CRCW06031300F Vishay
(1)
130Ω Resistor, 2%, Size 0603 1
R22 CRCW04021820F Vishay
(1)
12.1kΩ Resistor, 2%, Size 1206 1
R23, R24 CRCW04022825F Vishay
(1)
82Ω Resistor, 2%, Size 0402 2
R27 CRCW0402OOR0F Vishay
(1)
0Ω Resistor, 2%, Size 0402 1
R31 CRCW04025000F Vishay
(1)
50Ω Resistor, 2%, Size 0402 1
SMA1-
SMA10
142-0701-851 Johnson
Components
(3)
End Launch SMA Jack 10
SP1-SP6 Solder Jump Option 6
SW1 CT2068-ND CTS
(6)
8-Position, Top Actuated Slide Dip Switch 1
U1 SY69753AL Micrel, Inc.
(7)
Low-Power 3.3V 125Mbp s to 155Mbps Clock and
Data Recovery 1
U2 SY89322V Micrel, Inc.
(7)
3.3/5V Dual LVTTL/LVCMOS-to-Differential LVPECL
Translator 1
Notes:
1. Vishay: www.vishay.com.
2. Panasonic: www.panasonic.com.
3. Johnson Components: www.johnson-components.com.
4. Murata: www.murata.com.
5. NTE: www.nte.com.
6. CTS: www.cts.com.
7. Micrel, Inc: www.micrel.com.
Micrel, Inc. SY69753AL
August 2007
12 M9999-082107-E
hbwhelp@micrel.com or (408) 955-1690
Appendix A
Layout and General Suggestions
1. Establish controlled impedance stripline, microstrip, or
coplanar construction techniques.
2. Signal paths should have approximately the same width
as the device pads.
3. All differential paths are critical timing paths, where
skew should be matched to within ±10ps.
4. Signal trace impedance should not vary more than
±5%. If in doubt, perform TDR analysis of all high-speed
signal traces.
5. Maintain compact filter networks as close to filter pins
as possible. Provide ground plane relief under filter path
to reduce stray capacitance. Be careful of crosstalk
coupling into the filter network.
6. Maintain low jitter on the REFCLK input. Isolate the
XTAL oscillator from power supply noise by adequately
decoupling. Keep XTAL oscillator close to device, and
minimize capacitive coupling from adjacent signals.
7. Higher speed operation may require use of
fundamental-tone (third-overtone typically has more
jitter) crystal-based oscillator for optimum performance.
Evaluate and compare candidates by measuring
TXCLK jitter.
8. All unused outputs require termination. To conserve
power, unused PECL outputs can be terminated with a
1kΩ resistor to VEE.
Micrel, Inc. SY69753AL
August 2007
13 M9999-082107-E
hbwhelp@micrel.com or (408) 955-1690
Package Information
32-Pin Package Type (H32-1)
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 a Purchaser’s own risk
and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale.
© 2006 Micrel, Incorporated.
