SY87729L
3.3V AnyClock
®
, 10MHz to 365MHz
Fractional N Synthesizer
General Description
The SY87729L is a complete rate independent frequency
synthesizer integrated circuit. From a single reference
source, this device generates a differential PECL
reference frequency for Micrel's SY87721L 10Mbps to
2.7Gbps combined CDR and CMU.
The SY87729L generates an exactly correct reference
frequency for common data transport protocols. This is
especially important in transponder applications, where a
standards compliant protocol data unit must be generated
downstream, even in the absence of any signal from the
associated upstream interface.
In addition, SY87729L will generate exactly correct
reference frequencies for common data transport protocols
augmented by forward error correction codes.
For proprietary applications, the SY87729L generates
reference frequencies guaranteed to enable the SY87721L
CDR to lock to any possible baud rate in its range.
SY87729L accepts configuration via a MicroWire™
interface.
Data sheets and support documentation can be found on
Micrel’s web site at:
www.micrel.com.
AnyClock
®
Features
•
Fractional synthesizer from 10MHz to 365MHz from a
single 27MHz reference oscillator
•
Generates exactly the correct frequency for common
transport protocols with or without FEC
•
Directly enables SY87721L to lock onto any data rate
within its range
•
Exceeds BellCore and ITU jitter generation
specifications
•
Programmable via MicroWire™ interface
•
Available in 32-Pin EPAD-TQFP package
Applications
•
•
•
•
Metro access system
Transponders
Multiplexers: access, add drop mux
SONET/SDH/ATM-based transmission systems,
modules and test equipment
•
Broadband cross-connects
•
Fiber optic test equipment
•
Protocols supported:
−
OC-1, OC-3, OC-12, OC-48, ATM, Gigabit Ethernet,
Fast Ethernet, Fibre Channel, 2X Fibre Channel,
1394, InfiniBand, Proprietary Optical Transport
AnyClock and AnyRate are registered trademarks of Micrel, Inc.
MicroWire is a trademark of National Semiconductor
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 •
http://www.micrel.com
July 2011
M9999-072111-G
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY87729L
Ordering Information
(1)
Part Number
SY87729LHY
(3, 3)
SY87729LHYTR
(2, 3)
Notes:
1.
2.
3.
Contact factory for die availability. Dice are guaranteed at T
A
= 25°C, DC electricals only.
Tape and Reel.
Pb-free package is recommended for new designs.
Package Type
H32-2
H32-2
Operating Range
Industrial
Industrial
Package Marking
SY87729LHY with
Pb-Free Bar-Line Indicator
SY87729LHY with
Pb-Free Bar-Line Indicator
System Block Diagram
July 2011
2
M9999-072111-G
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY87729L
Functional Block Diagram
July 2011
3
M9999-072111-G
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY87729L
Pin Configuration
32-Pin ePad TQFP (H32-2)
Pin Description
Pin Number
1, 24
2, 5,11, 12, 13,
15, 16, 19, 20,
23, 28, 29
3, 4
6
7
8
9, 17
10
14
18
21, 22
25, 32
26, 27
Pin Name
VCCA
NC
REFCLK±
PROGCS
PROGDI
PROGSK
VCC
GND
LOCKED
VCCO
CLKOUT±
GNDA
WRVCF±
Pin Function
Analog Supply Voltage.
No Connection. These pins are to be left unconnected.
Differential PECL Input. .
Program Interface Chip Select (TTL Input). This signal forms part of the MicroWire™ interface.
When active high, this signal permits the acquisition of serial data. A falling edge on this input
causes SY87729L to re-acquire lock to a new frequency, based on the program downloaded to it.
Program Interface Data In (TTL Input). One data bit is sampled on each rising edge of PRGSK,
while PROGCS is active high.
Program Interface Serial Clock (TTL Input). One bit of configuration data is read in each clock
cycle
Supply Voltage.
Ground.
Lock Output. This indicates proper operation of all the blocks in the clock synthesis chain. Logic
high indicates that SY87729L is generating the expected frequency at the CLKOUT± output.
Logic low indicates that one or more PLL in the clock synthesis chain has yet to achieve proper
lock.
Output Supply Voltage.
Reference Clock Output. This is the synthesized clock generated from REFCLK±. It can be used
to supply a reference clock to a data recovery device, such as Micrel’s SY87721L.
Analog Ground.
Wrapper Filter (Analog I/O). These pins connect to the output from the wrapper synthesizer
charge pump, as well as the input to the corresponding VCO. A filter network, as described
below, converts the charge pump current to a voltage, and adjusts loop bandwidth
Fractional-N Filter (Analog I/O). These pins connect to the output from the fractional-N
synthesizer charge pump, as well as the input to the corresponding Voltage Controlled Oscillator
(VCO). A filter network, as described below, converts the charge pump current to a voltage, and
adjusts loop bandwidth
30, 31
FNVCF±
July 2011
4
M9999-072111-G
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY87729L
Absolute Maximum Ratings
(1)
Supply Voltage (V
CC
).................................... –0.5V to +4.0V
Input Voltage (V
IN
). .................................... –0.5V to V
CC
ECL 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)
Supply Voltage (V
CC
)...........................................+3.3V
±5%
Ambient Temperature (T
A
) .......................... –40°C to +85°C
Junction Temperature (TA) ........................................ 125°C
Package Thermal Resistance
ePad TQFP (θ
JA
)
(3)
Still-Air......................................................27.6°C/W
500lfpm ....................................................20.7°C/W
DC Electrical Characteristics
V
CC
= V
CCO
= V
CCA
= 3.3V
±5%;
GND = GNDA = 0V; T
A
= –40°C to +85°C.
Symbol
V
CC
I
CC
Parameter
Power Supply Voltage
Power Supply Current
No output load.
Condition
Min.
3.15
−
Typ.
3.3
205
Max.
3.45
275
Units
V
mA
PECL DC Electrical Characteristics
V
CC
= V
CCO
= V
CCA
= 3.3V
±5%;
GND = GNDA = 0V; T
A
= –40°C to +85°C.
Symbol
V
IH
V
IL
V
OH
V
OL
I
IL
Parameter
Input HIGH Voltage
Input LOW Voltage
Output HIGH Voltage
Output LOW Voltage
Input LOW Current
(4, 5)
Condition
Min.
V
CC
−
1.165
V
CC
−
1.810
Typ.
−
−
−
−
−
Max.
V
CC
−
0.880
V
CC
−
1.475
V
CC
−
0.830
V
CC
−
1.570
−
Units
V
V
V
V
µA
50Ω to V
CC
−2V
50Ω to V
CC
−2V
V
IN
= V
IL
(MIN)
V
CC
−
1.075
V
CC
−
1.860
−1.5
TTL DC Electrical Characteristics
V
CC
= V
CCO
= V
CCA
= 3.3V
±5%;
GND = GNDA = 0V; T
A
= –40°C to +85°C.
Symbol
V
IH
V
IL
V
OH
V
OL
I
IH
I
IL
I
OS
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.
The data sheet limits are not guaranteed if the device is operated beyond the operating ratings.
Measured with die attach pad soldered to PCB, JEDEC-standard multi-layer board.
The REFCLK+ pin has a nominal 75Ω pull-down resistor connected to ground.
The REFCLK− pin has a nominal 75Ω pull-down resistor connected to ground and a nominal has a nominal 75Ω pull-up resistor connected to V
CC
.
Parameter
Input HIGH Voltage
Input LOW Voltage
Output HIGH Voltage
Output LOW Voltage
Input HIGH Current
Input LOW Current
(4, 5)
Output Short-Circuit Current
Condition
Min.
2.0
−
Typ.
−
−
−
−
−
−
−
−
Max.
−
0.8
−
0.5
+20
+100
−300
−250
Units
V
V
V
V
µA
µA
mA
I
OH
=
−2mA
I
OL
= 4mA
V
IN
= 2.7V, V
CC
= MAX
V
IN
= V
CC
, V
CC
= MAX
V
IN
= 0.5V, V
CC
= MAX
V
OUT
= 0V (1sec. MAX)
2.0
−
−
−
−
−100
2.
3.
4.
5.
July 2011
5
M9999-072111-G
hbwhelp@micrel.com
or (408) 955-1690
京公网安备 11010802033920号
EEWORLD
