Micrel, Inc.
3.3V, PRECISION, 33MHz to 500MHz
PROGRAMMABLE LVPECL AND HSTL BUS
CLOCK SYNTHESIZER
Precision Edge
®
SY89531L
Precision Edge
®
SY89531L
FEATURES
s
Integrated synthesizer plus fanout buffers, clock
drivers, and translator in a single 64-pin package
s
3.3V
±
10% power supply
s
Low jitter: <50ps cycle-to-cycle
s
Low pin-to-pin skew: <50ps
s
33MHz to 500MHz output frequency range
s
Direct interface to crystal: 14MHz to 18MHz
s
LVPECL/HSTL outputs
s
TTL/CMOS compatible control logic
s
3 independently programmable output frequency
banks:
• 9 differential output pairs @BankB (HSTL)
• 2 differential output pairs @BankA (LVPECL)
• 2 differential output pairs @BankC (LVPECL)
s
ExtVCO input allows synthesizer and crystal
interface to be bypassed
s
Available in 64-pin EPAD-TQFP
Precision Edge
®
DESCRIPTION
The SY89531L programmable clock synthesizer/driver is
part of a 3.3V, high-frequency, precision PLL-based clock
synthesizer family optimized for multi-frequency, multi-
processor server, enterprise networking and other computing
applications that require the highest precision and integration.
The device integrates the following blocks into a single
monolithic IC:
•
•
•
•
PLL (Phase-Lock-Loop)-based synthesizer
Fanout buffers
Clock generator (dividers)
Logic translation (LVPECL, HSTL)
This level of integration minimizes the additive jitter and
part-to-part skew associated with the discrete alternative,
resulting in superior system-level timing as well as reduced
board space and power. For applications that must interface
to a reference clock, see the SY89536L.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
APPLICATIONS
s
s
s
s
s
Servers
Workstations
Parallel processor-based systems
Other high-performance computing
Communications
PRODUCT SELECTION GUIDE
Input
Device
SY89531L
SY89532L*
SY89533L*
SY89534L*
SY89535L*
SY89536L*
Crystal
X
X
X
X
X
X
Reference
BankA
LVPECL
Output
BankB
HSTL
BankC
LVPECL
LVPECL LVPECL LVPECL
LVPECL
LVDS
LVPECL
LVPECL LVPECL LVPECL
LVPECL
LVPECL
LVDS
HSTL
LVPECL
LVPECL
*Refer to individual data sheet for details.
Precision Edge is a registered trademark of Micrel, Inc.
M9999-010808
hbwhelp@micrel.com or (408) 955-1690
Rev.: C
Amendment: /0
1
Issue Date: January 2008
Micrel, Inc.
Precision Edge
®
SY89531L
PACKAGE/ORDERING INFORMATION
NC
GND
VCCA
VCC_LOGIC
VCC_LOGIC
OUT_SYNC
FSEL_A0
FSEL_A1
FSEL_A2
VCCOA
QA0
/QA0
QA1
/QA1
VCCOB
QB0
Ordering Information
(1)
Part Number
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
/QB0
QB1
/QB1
QB2
/QB2
QB3
/QB3
QB4
/QB4
QB5
/QB5
QB6
/QB6
QB7
/QB7
QB8
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
NC
NC
NC
VCO_SEL
/EXTVCO
EXTVCO
LOOP_REF
LOOP_FILTER
GND
XTAL2
XTAL1
VBB_REF
M(3)
M(2)
M(1)
M(0)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
/QC1
QC1
/QC0
QC0
VCCOC
FSEL_C2
FSEL_C1
FSEL_C0
GND
FSEL_B2
FSEL_B1
FSEL_B0
GND
VCCOB
VCCOB
/QB8
Package
Type
H64-1
H64-1
H64-1
H64-1
Operating
Range
Commercial
Commercial
Commercial
Commercial
Package
Marking
SY89531LHC
SY89531LHC
Lead
Finish
Sn-Pb
Sn-Pb
SY89531LHC
SY89531LHCTR
(2)
SY89531LHZ
(3)
SY89531LHZTR
(2, 3)
SY89531LHZ with
Matte-Sn
Pb-Free bar-line indicator Pb-Free
SY89531LHZ with
Matte-Sn
Pb-Free bar-line indicator Pb-Free
Notes:
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 is recommended for new designs.
64-Pin EPAD-TQFP (H64-1)
M9999-010808
hbwhelp@micrel.com or (408) 955-1690
2
Micrel, Inc.
Precision Edge
®
SY89531L
PIN DESCRIPTION
Power
Pin Number
60, 61
62
55
30, 31, 50
21
9, 25, 63, 29
(exposed pad)
Pin Name
V
CC_Logic
V
CCA
V
CCO
A
V
CCO
B
V
CCO
C
GND
Pin Function
Power for Core Logic: Connect to 3.3V supply. 3.3V power pins are not internally
connected on the die, and must be connected together on the PCB.
Power for PLL: Connect to “quiet” 3.3V supply. 3.3V power pins are not internally
connected on the die, and must be connected together on the PCB.
Power for Output Drivers: Connect all V
CCO
A and V
CCO
C pins to 3.3V supply and V
CCO
B
pins to 1.8V supply.
Ground: Exposed pad must be soldered to a ground plane.
Configuration
Pin Number
4
Pin Name
VCO_SEL
Pin Function
LVTTL/CMOS Compatible Input: Selects between internal or external VCO. For
external VCO, leave floating. Default condition is logic HIGH. Internal 25kΩ pull-up.
When tied LOW, internal VCO is selected.
Analog Input/Output: Provides the reference voltage for PLL loop filter.
Analog Input/Output: Provides the loop filter for PLL. See
“External Loop Filter
Considerations”
for loop filter values.
LVTTL/CMOS Compatible Input: Used to change the PLL feedback divider. Internal 25kΩ
pull-up. M0 = LSB. Default is logic HIGH. See
“Feedback Divide Select”
table.
LVTTL/CMOS Compatible Input: Bank C post divide select. Internal 25kΩ pull-up.
Default is logic HIGH. See
“Post-Divide Frequency Select”
table. FSEL_C0 = LSB.
LVTTL/CMOS Compatible Input: Bank B post divide select. Internal 25kΩ pull-up.
Default is logic HIGH. See
“Post-Divide Frequency Select”
table. FSEL_B0 = LSB.
LVTTL/CMOS Compatible Input: Bank A post divide select. Internal 25kΩ pull-up.
Default is logic HIGH. See
“Post-Divide Frequency Select”
table. FSEL_A0 = LSB.
Banks A, B, C Output Synchronous Control: (LVTTL/CMOS compatible). Internal 25kΩ
pull-up. After any bank has been programmed, toggle with a HIGH-LOW-HIGH
pulse to resynchronize all output banks.
7
8
13,14,15,16
22, 23, 24
26, 27, 28
56, 57, 58
59
LOOP REF
LOOP FILTER
M (3:0)
FSEL_C (2:0)
FSEL_B (2:0)
FSEL_A (2:0)
OUT_SYNC
Input/Output
Pin Number
1, 2, 3
10, 11
12
5, 6
Pin Name
NC
XTAL2, XTAL1
VBB_REF
/EXT_VCO,
EXT_VCO
QA1 to QA0
Pin Function
No Connect: Leave floating.
Crystal Input. Directly connect a series resonant crystal across inputs.
Reference Output Voltage. Used for single-ended input. Maximum sink/source
current = 0.5mA.
Differential “Any In” Compatible Input Pair. Allows for external VCO connection. The “Any
In” input structure accepts many popular logic types. See
“Input Interface for ExtVCO Pins”
section for interface diagrams. Can leave unconnected if using internal VCO.
Bank A 100k LVPECL Output Drivers: Output frequency is controlled by FSEL_A
(0:2). Terminate outputs with 50Ω to V
CC
–2V. See
“Output Termination
Recommendations”
section.
Bank B Output Drivers: Differential HSTL outputs. See
“Output Termination Recommendations”
section. Output frequency is controlled by FSEL_B (0:2).
Bank C 100k LVPECL Output Drivers: Output frequency is controlled by FSEL_C (0:2).
Terminate outputs with 50Ω to V
CC
–2V. See
“Output Termination Recommendations”
section.
No Connect: Leave floating.
51, 52, 53, 54
32–49
17, 18, 19, 20
64
QB8 to QB0
QC1 to QC0
NC
M9999-010808
hbwhelp@micrel.com or (408) 955-1690
3
Micrel, Inc.
Precision Edge
®
SY89531L
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
IN
) ................................... –0.5V to +4.0V
V
CC
Pin Potential to Ground Pin (All V
CC
) .. –0.5V to +4.0V
Input Voltage (except XTAL 1,2 pins) (V
IN
) ... –0.5V to V
CCI
XTAL 1, 2 Input Voltage (V
XTAL 1,2
) ...... (V
CC
–1.9V) to V
CC
DC Output Current (I
OUT
)
–LVPECL, HSTL outputs ..................................... –50mA
Lead Temperature (soldering, 20 sec.) ..................... 260°C
Storage Temperature (T
S
) ....................... –65°C to +150°C
Operating Ratings
(Note 2)
Supply Voltage
V
CCO
A and V
CCO
C ...................................... 3.0V to 3.6V
V
CCO
B ......................................................... 1.6V to 2.0V
Ambient Temperature (T
A
) ............................. 0°C to +85°C
Package Thermal Resistance (Junction-to-Ambient)
With Die attach soldered to GND:
TQFP (θ
JA
) Still-Air .............................................. 23°C/W
TQFP (θ
JA
) 200lfpm ............................................ 18°C/W
TQFP (θ
JA
) 500lfpm ............................................ 15°C/W
With Die attach NOT soldered to GND,
Note 3
TQFP (θ
JA
) Still-Air .............................................. 44°C/W
TQFP (θ
JA
) 200lfpm ............................................ 36°C/W
TQFP (θ
JA
) 500lfpm ............................................ 30°C/W
Package Thermal Resistance (Junction-to-Case)
TQFP
(θ
JC
) ......................................................... 4.3°C/W
DC ELECTRICAL CHARACTERISTICS
Power Supply
Symbol
V
CCA
V
CC_Logic
V
CCO
A/C
V
CCO
B
I
CC
Note 1.
Parameter
PLL and Logic Supply Voltage
Bank A and C V
CC
Output
Bank B V
CC
Output
LVPECL/HSTL
Total Supply Current
Condition
Note 4
Min
3.0
3.0
1.6
Typ
3.3
3.3
1.8
230
Max
3.6
3.6
2.0
295
Units
V
V
V
mA
Note 5
—
Note 2.
Note 3.
Note 4.
Note 5.
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 ratlng conditions for extended
periods may affect device reliability.
The data sheet limits are not guaranteed if the device is operated beyond the operating ratings.
It is recommended that the user always solder the exposed die pad to a ground plane for enhanced heat dissipation.
V
CCA
, V
CC_LOGIC
, V
CCO
A/C are
not
internally connected together inside the device. They must be connected together on the PCB. V
CCO
B is a
separate supply.
No load. Outputs floating, Banks A, B, and C enabled.
M9999-010808
hbwhelp@micrel.com or (408) 955-1690
4
Micrel, Inc.
Precision Edge
®
SY89531L
DC ELECTRICAL CHARACTERISTICS
LVCMOS/LVTTL Input Control Logic
(V
CCA
, V
CC_LOGIC
, V
CCO
A/C = +3.3V
±10%)
Symbol
V
IH
V
IL
I
IH
I
IL
Parameter
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
Condition
Min
2.0
—
—
—
Typ
—
—
—
—
Max
—
0.8
150
–300
Units
V
V
µA
µA
ExtVCO (Pins 5, 6) INPUT
(All V
CC
pins except V
CCO
B = +3.3V
±10%,
V
CCO
B = +1.8V
±10%)
Symbol
V
ID
V
IH
V
IL
Parameter
Differential Input Voltage
Input HIGH Voltage
Input LOW Voltage
Condition
Min
100
—
–0.3
Typ
—
—
—
Max
—
V
CC
+0.3
—
Units
mV
V
V
100K LVPECL Output
(All V
CC
pins except V
CCO
B = +3.3V
±10%,
V
CCO
B = +1.8V
±10%)
(Note 6)
Symbol
V
OH
V
OL
V
BB
V
OUT
Parameter
Output HIGH Voltage
Output LOW Voltage
Output Reference Voltage
Output Voltage Swing
Condition
Min
Typ
Max
Units
V
V
V
mV
V
CC
–1.145 V
CC
–1.020 V
CC
–0.895
V
CC
–1.945 V
CC
–1.820 V
CC
–1.695
V
CC
–1.325 V
CC
–1.425 V
CC
–1.525
—
800
—
HSTL Output (Bank B QB0:8)
(All V
CC
pins except V
CCO
B = +3.3V
±10%,
V
CCO
B = +1.8V
±10%)
(Note 7)
Symbol
V
OUT
V
OH
V
OL
Note 6.
Note 7.
Parameter
Output Voltage Swing
Output HIGH Voltage
Output LOW Voltage
All LVPECL outputs loaded with 50Ω to V
CC
–2V.
All HSTL outputs loaded with 50Ω to GND.
Condition
Min
—
1.0
0.2
Typ
800
—
—
Max
—
1.2
0.4
Units
mV
V
V
M9999-010808
hbwhelp@micrel.com or (408) 955-1690
5
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