Si5335
W
EB
-C
USTOMIZABLE
, A
NY
- F
REQUENCY
, A
NY
- O
U TP U T
Q
UAD
C
LOCK
G
ENERATOR
/B
U FF E R
Features
Low power MultiSynth™ technology
enables independent, any-frequency
synthesis of four frequencies
Configurable as a clock generator or
clock buffer device
Three independent, user-assignable, pin-
selectable device configurations
Highly-configurable output drivers with
up to four differential outputs, eight
single-ended clock outputs, or a
combination of both
Low phase jitter of 0.7 ps RMS
Flexible input reference:
External
CMOS
crystal: 25 or 27 MHz
input: 10 to 200 MHz
SSTL/HSTL input: 10 to 350 MHz
Differential input: 10 to 350 MHz
1 to 250 MHz
1 to 200 MHz
SSTL/HSTL: 1 to 350 MHz
CMOS:
24
23
22
21
20
19
18
CLK1A
17
CLK1B
16
VDDO1
15
VDDO2
14
CLK2A
13
CLK2B
Wide temperature range: –40 to
+85 °C
XA/CLKIN
1
XB/CLKINB
2
P3
3
GND
4
GND
GND
Pad
Applications
Description
The Si5335 is a highly flexible clock generator capable of synthesizing four completely
non-integer-related frequencies up to 350 MHz. The device has four banks of outputs
with each bank supporting one differential pair or two single-ended outputs. Using
Silicon Laboratories' patented MultiSynth fractional divider technology, all outputs are
guaranteed to have 0 ppm frequency synthesis error regardless of configuration,
enabling the replacement of multiple clock ICs and crystal oscillators with a single
device. The Si5335 supports up to three independent, pin-selectable device
configurations, enabling one device to replace three separate clock generators or
buffer ICs. To ease system design, up to five user-assignable and pin-selectable
control pins are provided, supporting PCIe-compliant spread spectrum control, master
and/or individual output enables, frequency plan selection, and device reset. Two
selectable PLL loop bandwidths support jitter attenuation in applications, such as PCIe
and DSL. Through its flexible ClockBuilder™ (www.silabs.com/ClockBuilder) web
configuration utility, factory-customized, pin-controlled devices are available in two
weeks without minimum order quantity restrictions. Measuring PCIe clock jitter is quick
and easy with the Silicon Labs PCIe Clock Jitter Tool. Download it for free at
www.silabs.com/pcie-learningcenter.
Rev. 1.4 12/15
Copyright © 2015 by Silicon Laboratories
VDDO3
CLK3B
CLK3A
Ethernet switch/router
PCI Express Gen 1/2/3/4
PCIe jitter attenuation
DSL jitter attenuation
Broadcast video/audio timing
Processor and FPGA clocking
MSAN/DSLAM/PON
Fibre Channel, SAN
Telecom line cards
1 GbE and 10 GbE
P5
5
P6
6
7
8
9
10
11
12
VDD
LOS
P1
P2
HCSL:
45
mA (PLL mode)
12 mA (Buffer mode)
CLK0A
CLK0B
VDD
VDDO0
LVPECL/LVDS/CML:
1 to 350 MHz
RSVD_GND
Independently configurable outputs
support any frequency or format:
Independent output voltage per driver:
1.5, 1.8, 2.5, or 3.3 V
Single supply core with excellent
PSRR: 1.8, 2.5, 3.3 V
Up to five user-assignable pin
functions simplify system design:
SSENB (spread spectrum control),
RESET, Master OEB or OEB per pin,
and Frequency plan select
(FS1, FS0)
Loss of signal alarm
PCIe Gen 1/2/3/4 common clock
compliant
PCIe Gen 3 SRNS Compliant
Two selectable loop bandwidth
settings: 1.6 MHz or 475 kHz
Easy to customize with web-based
utility
Small size: 4 x 4 mm, 24-QFN
Low power (core):
Ordering Information:
See page 41.
Pin Assignments
Top View
Si5335
Si5335
Functional Block Diagram
Osc
PLL Bypass
÷MultiSynth0
PLL
PLL Bypass
÷MultiSynth1
OEB0
VDDO0
CLK0A
CLK0B
XA / CLKIN
XB / CLKINB
CLKIN
VDDO1
CLK1A
CLK1B
P1
P2
P3
P5
P6
Programmable
Pin Function
Options:
OEB0/1/2/3
OEB_all
SSENB
FS[1:0]
RESET
Control
PLL Bypass
÷MultiSynth2
PLL Bypass
÷MultiSynth3
OEB1
VDDO2
CLK2A
CLK2B
OEB2
VDDO3
CLK3A
CLK3B
OEB3
LOS
2
Rev. 1.4
Si5335
T
ABLE
Section
OF
C
ONTENTS
Page
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Typical PCIe System Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.2. MultiSynth Technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.3. ClockBuilder Web-Customization Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.4. Input Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.5. Input and Output Frequency Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.6. Multi-Function Control Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.7. Output Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.8. Frequency Select/Device Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.9. Loss-of-Signal Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.10. Output Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4. Power Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5. Spread Spectrum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
6. Jitter Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7. Power Supply Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8. Loop Bandwidth Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
9. Applications of the Si5335 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
9.1. Free-Running Clock Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
9.2. Synchronous Frequency Translation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
9.3. Configurable Universal Buffer and Level Translator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
10. Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
11. Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
12. Package Outline: 24-Lead QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
13. Recommended PCB Land Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
14. Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
14.1. Si5335 Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
14.2. Top Marking Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
15. Device Errata . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Rev. 1.4
3
Si5335
1. Electrical Specifications
Table 1. Recommended Operating Conditions
(V
DD
= 1.8 V –5% to +10%, 2.5 V ±10%, or 3.3 V ±10%, T
A
= –40 to 85 °C)
Parameter
Ambient Temperature
Symbol
T
A
Test Condition
Min
–40
2.97
Typ
25
3.3
2.5
1.8
—
Max
85
3.63
2.75
1.98
3.63
Unit
°C
V
V
V
V
Core Supply Voltage
V
DD
2.25
1.71
Output Buffer Supply
Voltage
V
DDOn
1.4
Note:
All minimum and maximum specifications are guaranteed and apply across the recommended operating conditions.
Typical values apply at nominal supply voltages and an operating temperature of 25 °C unless otherwise noted.
Table 2. DC Characteristics
(V
DD
= 1.8 V –5% to +10%, 2.5 V ±10%, or 3.3 V ±10%, T
A
= –40 to 85 °C)
Parameter
Core Supply Current
(Clock Generator Mode)
Core Supply Current
(Buffer Mode)
Symbol
I
DDCG
I
DDB
Test Condition
100 MHz on all outputs,
25 MHz refclk,
clock generator mode
50 MHz refclk
LVPECL, 350 MHz
CML, 350 MHz
LVDS, 350 MHz
HCSL, 250 MHz
2 pF load
SSTL, 350 MHz
CMOS, 50 MHz
15 pF load
1
CMOS, 200 MHz
1,2
3.3 V VDD0
CMOS, 200 MHz
1,2
2.5 V
CMOS, 200 MHz
1,2
1.8 V
HSTL, 350 MHz
Min
—
Typ
45
Max
60
Unit
mA
—
—
—
—
—
—
—
—
—
—
—
12
—
12
—
—
—
6
13
10
7
—
—
30
—
8
20
19
9
18
14
10
19
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
Output Buffer Supply Current
I
DDOx
Notes:
1.
Single CMOS driver active.
2.
Measured into a 5” 50
trace with 2 pF load.
4
Rev. 1.4
Si5335
Table 3. Performance Characteristics
(V
DD
= 1.8 V –5% to +10%, 2.5 V ±10%, or 3.3 V ±10%, T
A
= –40 to 85 °C)
Parameter
PLL Acquisition Time
PLL Tracking Range
Symbol
t
ACQ
f
TRACK
f
BW1
f
BW2
Test Condition
1.6 MHz loop bandwidth
475 kHz or 1.6 MHz loop
bandwidth
High bandwidth option
Low bandwidth option
Output frequency < Fvco/8
Min
—
5000
—
—
0
—
0.01
—
Typ
—
20000
1.6
475
0
2.6
0.2
—
2.5
—
—
–0.45
31.5
Max
25
—
—
—
1
5
1
2
4
200
100
–0.5
33
Unit
ms
ppm
MHz
kHz
ppb
µs
µs
ms
ns
ns
ps
%
kHz
PLL Loop Bandwidth
MultiSynth Frequency
Synthesis Resolution
CLKIN Loss of Signal Detect
Time
CLKIN Loss of Signal Release
Time
POR to Output Clock Valid
Input-to-Output Propagation
Delay
Reset Minimum Pulse Width
Output-Output Skew
1
Spread Spectrum PP
Frequency Deviation
2
Spread Spectrum Modulation
Rate
3
f
RES
t
LOS
t
LOSRLS
t
RDY
t
PROP
t
RESET
t
DSKEW
SS
DEV
SS
DEV
Buffer Mode
(PLL Bypass)
—
—
F
OUT
> 5 MHz
F
OUT
= 100 MHz
F
OUT
= 100 MHz
—
—
30
Notes:
1.
Outputs at integer-related frequencies and using the same driver format.
2.
Default value is 0.5% down spread.
3.
Default value is 31.5 kHz for PCI compliance.
Rev. 1.4
5
Microchip MCU
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
