MICREL SY58032UMGTR

Micrel, Inc.
ULTRA-PRECISION 1:8 FANOUT
BUFFER WITH LVPECL OUTPUTS
AND INTERNAL TERMINATION
Precision Edge®
SY58032U
®
Precision Edge
SY58032U
FEATURES
■ Precision 1:8, LVPECL fanout buffer
■ Guaranteed AC performance over temperature and
voltage:
• Clock frequency range: DC to 4GHz
• <110ps tr / tf times
• <330ps tpd
• <20ps skew
■ Low-jitter performance:
• <10psPP total jitter (clock)
• <1psRMS random jitter
■ 100k LVPECL compatible outputs
■ Fully differential inputs/outputs
■ Accepts an input signal as low as 100mV
■ Unique input termination and VT pin accepts DCcoupled and AC-coupled differential inputs:
(LVPECL, LVDS, and CML)
■ Power supply 2.5V ±5% or 3.3V ±10%
■ Industrial temperature range: –40°C to +85°C
■ Available in 32-pin (5mm × 5mm) MLF™ package
Precision Edge®
DESCRIPTION
The SY58032U is a 2.5V/3.3V precision, high-speed, fully
differential LVPECL 1:8 fanout buffer. The SY58032U is
optimized to provide eight identical output copies with less
than 20ps of skew and less than 10psPP total jitter. It can
process clock signals as fast as 4GHz.
The differential input includes Micrel’s unique, 3-pin input
termination architecture that allows the SY58032U to directly
interface to LVPECL, CML, and LVDS differential signals
(AC- or DC-coupled) without any level-shifting or termination
resistor networks in the signal path. The result is a clean,
stub-free, low-jitter interface solution. The LVPECL (100k
temperature compensated) outputs feature 800mV typical
swing into 50Ω loads, and provide an extremely fast rise/fall
time guaranteed to be less than 110ps.
The SY58032U operates from a 2.5V ±5% supply or
3.3V ±10% supply and is guaranteed over the full industrial
temperature range (–40°C to +85°C). For applications that
require a higher high-speed 1:8 fanout buffer, consider the
SY58031U or SY58033U. The SY58032U is part of Micrel’s
high-speed, Precision Edge® product line.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
FUNCTIONAL BLOCK DIAGRAM
APPLICATIONS
■
■
■
■
All SONET and all GigE clock distribution
All Fibre Channel clock and data distribution
Network routing engine timing distribution
High-end, low-skew multiprocessor synchronous
clock distribution
Q0
/Q0
Q1
/Q1
Q2
/Q2
IN
Q3
50Ω
VT
/Q3
50Ω
/IN
Q4
/Q4
VREF-AC
Q5
/Q5
Q6
/Q6
Q7
/Q7
Precision Edge is a registered trademark of Micrel, Inc.
MicroLeadFrame and MLF are trademarks of Amkor Technology, Inc.
M9999-072205
[email protected] or (408) 955-1690
Rev.: C
1
Amendment: /0
Issue Date: July 2005
Precision Edge®
SY58032U
Micrel, Inc.
PACKAGE/ORDERING INFORMATION
VCC
Q0
/Q0
Q1
/Q1
Q2
/Q2
VCC
Ordering Information(1)
32 31 30 29 28 27 26 25
VCC
GND
IN
VT
VREF-AC
/IN
GND
VCC
1
24
2
23
3
22
4
21
5
20
6
19
7
18
8
17
GND
VCC
Q3
/Q3
Q4
/Q4
VCC
GND
VCC
/Q7
Q7
/Q6
Q6
/Q5
Q5
VCC
9 10 11 12 13 14 15 16
32-Pin MLF™ (MLF-32)
Part Number
Package
Type
Operating
Range
Package
Marking
Lead
Finish
SY58032UMI
MLF-32
Industrial
SY58032U
Sn-Pb
SY58032UMITR(2)
MLF-32
Industrial
SY58032U
Sn-Pb
SY58032UMG(3)
MLF-32
Industrial
SY58032U with
Pb-Free bar-line indicator
Pb-Free
NiPdAu
SY58032UMGTR(2, 3)
MLF-32
Industrial
SY58032U with
Pb-Free bar-line indicator
Pb-Free
NiPdAu
Notes:
1. Contact factory for die availability. Dice are guaranteed at TA = 25°C, DC electricals only.
2. Tape and Reel.
3. Recommended for new designs.
PIN DESCRIPTION
Pin Number
Pin Name
3, 6
IN, /IN
4
VT
Input Termination Center-Tap: Each input terminates to this pin. The VT pin provides a
center-tap for each input (IN, /IN) to the termination network for maximum interface
flexibility. See “Input Interface Applications” section.
2, 7, 17, 24
GND,
Exposed Pad
Ground. Exposed pad must be connected to a ground plane that is the same potential
as the ground pin.
1, 8, 9, 16,
18, 23, 25, 32
VCC
Positive Power Supply: Bypass with 0.1µF0.01µF low ESR capacitors as close to the
pins as possible.
31, 30, 29, 28, 27,
26, 22, 21, 20, 19,
15, 14, 13, 12,
11, 10
Q0, /Q0, Q1, /Q1,
Q2, /Q2, Q3, /Q3,
Q4, /Q4, Q5, /Q5,
Q6, /Q6, Q7, /Q7
100k LVPECL Differential Output Pairs: Differential buffered output copy of the
input signal. The LVPECL output swing is typically 800mV into 50Ω. Unused output pairs
may be left floating with no impact on jitter. See “LVPECL Output” section.
5
VREF-AC
M9999-072205
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Pin Function
Differential Signal Input: Each pin of this pair internally terminates with 50Ω to the VT
pin. Note that this input will default to an indeterminate state if left open.
See “Input Interface Applications” section.
Bias Reference Voltage: Equal to VCC–1.2V (typical), and used for AC-coupled
applications. See “Input Interface Applications” section. When using VREF-AC, bypass
with 0.01µF capacitor to VCC. Maximum sink/source current is 0.5mA.
2
Precision Edge®
SY58032U
Micrel, Inc.
Absolute Maximum Ratings(1)
Operating Ratings(2)
Power Supply Voltage (VCC ) ...................... –0.5V to +4.0V
Input Voltage (VIN) ......................................... –0.5V to VCC
Current (VT)
Source or sink current on VT pin ........................ ±100mA
Input Current (VT)
Source or sink current on IN, /IN .......................... ±50mA
Current (VREF)
Source or sink current on VREF-AC(3) ....................... ±1.5mA
Lead Temperature Soldering, (20 sec.) .................... 260°C
Storage Temperature Range (TS ) ........... –65°C to +150°C
Power Supply Voltage (VCC) ................. +2.375V to +3.60V
Ambient Temperature Range (TA) ............. –40°C to +85°C
Package Thermal Resistance(4)
MLF™ (θJA)
Still-Air ............................................................. 35°C/W
MLF™ (ψJB)
Junction-to-Board ............................................ 20°C/W
DC ELECTRICAL CHARACTERISTICS(5)
TA= –40°C to +85°C
Symbol
Parameter
Condition
Min
Typ
Max
Units
VCC
Power Supply Voltage
2.5V nominal
3.3V nominal
2.375
3.0
2.5
3.3
2.625
3.6
V
V
ICC
Power Supply Current
VCC = max. No load. Includes current
through 50Ω pull-ups.
190
250
mA
VIH
Input HIGH Voltage
IN, /IN; Note 6.
VCC–1.6
VCC
V
VIL
Input LOW Voltage
IN, /IN
0
VIH–0.1
V
VIN
Input Voltage Swing
IN, /IN, see Figure 1a.
0.1
1.7
V
VDIFF_IN
Differential Input Voltage Swing
|IN0, /IN0|, |IN1, /IN1|
IN, /IN, see Figure 1b.
0.2
RIN
In-to-VT Resistance
VT IN
Max. In-to-VT (IN, /IN)
40
VREF-AC
V
50
60
Ω
1.28
V
VCC–1.3 VCC–1.2 VCC–1.1
V
LVPECL DC ELECTRICAL CHARACTERISTICS(5)
VCC = 2.5V ±5% or 3.3V ±10%; RL = 50Ω to VCC–2V; TA= –40°C to +85°C, unless otherwise stated.
Symbol
Parameter
Condition
Min
Typ
Max
Units
VOH
Output HIGH Voltage
VCC–1.145
VCC–0.895
V
VOL
Output LOW Voltage
VCC–1.945
VCC–1.695
V
VOUT
Output Voltage Swing
see Figure 1a.
500
800
VDIFF_OUT
Differential Voltage Swing
see Figure 1b.
1000
1600
mV
2000
mV
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 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 (GND) 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 tables after thermal equilibrium has been established.
6. VIH (min) not lower than 1.2V.
M9999-072205
[email protected] or (408) 955-1690
3
Precision Edge®
SY58032U
Micrel, Inc.
AC ELECTRICAL CHARACTERISTICS(7)
VCC = 2.5V ±5% or 3.3V ±10%; RL = 50Ω to VCC–2V; TA= –40°C to +85°C, unless otherwise stated.
Symbol
Parameter
Condition
fMAX
Maximum Operating Frequency
VOUT ≥ 400mV
tpd
Propagation Delay
tpd tempco
Differential Propagation Delay
Temperature Coefficient
tSKEW
Output-to-Output Skew (within Device)
Note 8
Part-to-Part Skew
Clock
tJITTER
tr, tf
Min
Clock
Typ
Max
4
(IN-to-Q)
180
Units
GHz
260
330
35
fs/°C
20
ps
Note 9
100
ps
Cycle-to-Cycle Jitter
Note 10
1
psRMS
Total Jitter (Clock)
Note 11
10
psPP
Random Jitter (RJ)
Note 12
1
psRMS
110
ps
Output Rise/Fall Time
7
ps
20% to 80%, at full output swing.
35
75
Notes:
7.
High frequency AC electricals are guaranteed by design and characterization. All outputs loaded with 50Ω to VCC – 2V, VIN ≥ 100mV.
8.
Output-to-output skew is measured between outputs under identical transitions.
9.
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. Part-to-part skew includes variation in tpd.
10. 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.
11. 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.
12. Random jitter is measured with a K28.7 comma detect character pattern, measured at 1.25Gbps and 2.5Gbps.
SINGLE-ENDED AND DIFFERENTIAL SWINGS
VDIFF_IN,
VDIFF_OUT 1.6V (Typ.)
VIN,
VOUT 800mV (Typ.)
Figure 1a. Single-Ended Voltage Swing
Figure 1b. Differential Voltage Swing
TIMING DIAGRAM
/IN
VIN
IN
tpd
tpd
/Q
VOUT
Q
M9999-072205
[email protected] or (408) 955-1690
4
Precision Edge®
SY58032U
Micrel, Inc.
TYPICAL OPERATING CHARACTERISTICS
VCC = 2.5V, GND = 0, VIN = 100mV, TA= 25°C, unless otherwise stated.
200MHz Output
Output Swing
(200mV/div.)
Output Swing
(200mV/div.)
1.25GHz Output
TIME (600ps/div.)
TIME (100ps/div.)
Output Swing
(200mV/div.)
4GHz Output
TIME (30ps/div.)
∆ Output-to-Output Skew
Amplitude
vs. Frequency
900
2.5
vs. Temperature
2
700
∆ SKEW (ps)
600
500
400
300
200
1
0
-60 -40 -20 0
8000
7000
6000
5000
3000
2000
1000
0
1.5
0.5
100 V = 400mV
IN
0
4000
AMPLITUDE (mV)
800
20 40 60 80 100
TEMPERATURE (°C)
FREQUENCY (MHz)
235.5
PROPAGATION DELAY (ps)
PROPAGATION DELAY (ps)
265
Propagation Delay
vs. Input Swing
260
255
250
245
240
235
230
0
200
400
600
800
VIN = 800mV
234.5
234
233.5
233
232.5
232
231.5
-60 -40 -20 0
1000
20 40 60 80 100
TEMPERATURE (°C)
INPUT SWING (mV)
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235
Propagation Delay
vs. Temperature
5
Precision Edge®
SY58032U
Micrel, Inc.
INPUT BUFFER
VCC
IN
50Ω
VT
GND
50Ω
/IN
Figure 2. Simplified Differential Input Buffer
INPUT INTERFACE APPLICATIONS
VCC
VCC
VCC
VCC
VCC
IN
VCC
LVPECL
/IN
IN
IN
SY58032U
CML
CML
/IN
/IN
SY58032U
GND NC
NC
VCC
GND
SY58032U
GND
0.01µF
VREF-AC
VREF-AC
VT
VT
VREF-AC
VCC
VT
0.01µF
Rpd
For 2.5V, Rpd = 19Ω
For 3.3V, Rpd = 50Ω
Figure 3a. DC-Coupled CML
Input Interface
Figure 3b. AC-Coupled CML
Input Interface
Option: May connect VT to VCC .
VCC
VCC
VCC
VCC
IN
LVPECL
IN
/IN
Rpd
Rpd
LVDS
SY58032U
GND
/IN
SY58032U
VREF-AC
GND
For 3.3V, Rpd = 100Ω
For 2.5V, Rpd = 50Ω
VT
GND
NC
VREF-AC
NC
VT
VCC
Figure 3d. AC-Coupled LVPECL
Input Interface
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Figure 3e. LVDS
Input Interface
6
Figure 3c. LVPECL
Input Interface
Precision Edge®
SY58032U
Micrel, Inc.
LVPECL OUTPUT
LVPECL has high input impedance, and very low output
impedance (open emitter), and small signal swing which
results in low EMI. LVPECL is ideal for driving 50Ω and
100Ω controlled impedance transmission lines. There are
several techniques for terminating the LVPECL
output: Parallel Termination-Thevenin Equivalent, Parallel
Termination (3-resistor), and AC-coupled Termination.
Unused output pairs may be left floating. However, singleended outputs must be terminated, or balanced.
+3.3V
+3.3V
ZO = 50Ω
R1
130Ω
R1
130Ω
R2
82Ω
R2
82Ω
+3.3V
ZO = 50Ω
For +2.5V systems,
R1 = 250Ω, R2 = 62.5Ω
VT = VCC —2V
Figure 4. Parallel Termination-Thevenin Equivalent
+3.3V
+3.3V
Z = 50Ω
Z = 50Ω
50Ω
50Ω
“source”
“destination”
VCC
Rb
C1 (optional)
Notes:
0.01µF
1. Power-saving alternative to Thevenin termination.
2. Place termination resistors as close to destination inputs as possible.
3. Rb resistor sets the DC bias voltage, equal to VT.
4. For 2.5V systems, Rb = 19Ω, For 3.3V systems, Rb = 50Ω
Figure 5. Parallel Termination (3-Resistor)
RELATED MICREL PRODUCTS AND SUPPORT DOCUMENTATION
Part Number
Function
Data Sheet Link
SY58031U
Ultra-Precision 1:8 Fanout Buffer with 400mV CML
Outputs and Internal I/O Termination
http://www.micrel.com/product-info/products/sy58031u.shtml
SY58032U
Ultra-Precision 1:8 Fanout Buffer with LVPECL
Outputs and Internal Termination
http://www.micrel.com/product-info/products/sy58032u.shtml
SY58033U
Ultra-Precision 1:8 Fanout Buffer with 400mV LVPECL
Outputs and Internal Termination
http://www.micrel.com/product-info/products/sy58033u.shtml
32-MLF™ Manufacturing Guidelines Exposed Pad
Application Note
www.amkor.com/products/notes_papers/MLF_AppNote_0902.pdf
HBW Solutions
http://www.micrel.com/product-info/as/solutions.shtml
M9999-072205
[email protected] or (408) 955-1690
7