2-output 3.3V PCIe Clock Generator
9FGL02
DATASHEET
Description
The 9FGL02 devices are 3.3V members of IDT's 3.3V
Full-Featured PCIe family. The devices have 2 output enables
for clock management and support 2 different spread
spectrum levels in addition to spread off. The 9FGL02
supports PCIe Gen1-4 Common Clocked architectures (CC)
and PCIe Separate Reference no-Spread (SRnS) and
Separate Reference Independent Spread (SRIS) clocking
architectures. The 9FGL02P1 can be programmed with a
user-defined power up default SMBus configuration.
Features/Benefits
•
Direct connection to 100 (xx41) or 85 (xx51)
•
•
transmission lines; saves 8 resistors compared to standard
PCIe devices
112mW typical power consumption (@3.3V); eliminates
thermal concerns
SMBus-selectable features allows optimization to customer
requirements:
•
control input polarity
•
control input pull up/downs
•
slew rate for each output
•
33, 85 or 100Ω output impedance for each output
•
spread spectrum amount
•
input frequency
41 and 51 devices contain default configuration; SMBus
interface not required for device operation
P1 device allows factory programming of customer-defined
input/output frequencies and SMBus power up default;
allows exact optimization to customer requirements
OE# pins; support DIF power management
8MHz - 40MHz input frequency with 9FGL02P1 device
(25MHz default); flexibility
Pin/SMBus selectable 0%, -0.25% or -0.5% spread on DIF
outputs; minimize EMI and phase jitter for each application
DIF outputs blocked until PLL is locked; clean system
start-up
Two selectable SMBus addresses; multiple devices can
easily share an SMBus segment
Space saving 24-pin 4x4mm VFQFPN; minimal board
space
Recommended Application
PCIe Gen1-4 clock generation for Riser Cards, Storage,
Networking, JBOD, Communications, Access Points
Output Features
•
2 – 100 MHz Low-Power HCSL (LP-HCSL) DIF pairs
•
9FGL0241 default Z
OUT
= 100
•
9FGL0251 default Z
OUT
= 85
•
9FGL02P1 factory programmable defaults
•
1 - 3.3V LVCMOS REF output w/Wake-On-LAN (WOL)
•
support
Easy AC-coupling to other logic families, see IDT
application note
AN-891
•
•
•
•
•
•
•
•
Key Specifications
•
•
•
•
•
•
•
PCIe Gen1-2-3-4 CC-compliant
PCIe Gen2-3 SRIS-compliant
DIF cycle-to-cycle jitter <50ps
DIF output-to-output skew <50ps
DIF 12k-20M phase jitter is <2ps rms when SSC is off
REF phase jitter is <300fs rms (SSC off) and < 1.5ps RMS
(SSC on)
±100ppm frequency accuracy on all clocks
Block Diagram
vOE(1:0)#
XIN/CLKIN_25
2
y
REF
603-25-150JA4I 25MHz
X2
DIF1
SSC Capable
PLL
DIF0
vSADR
vSS_EN_tri
^CKPWRGD_PD#
SDATA_3.3
SCLK_3.3
Control
Logic
Note:
Resistors default to internal on 41/51 devices. P1 devices have programmable default impedances on an output-by-output basis.
9FGL02 DECEMBER 1, 2016
1
©2016 Integrated Device Technology, Inc.
9FGL02 DATASHEET
Pin Configuration
^CKPWRGD_PD#
vSS_EN_tri
GNDXTAL
VDD3.3
VDD3.3
24 23 22 21 20 19
XIN/CLKIN_25 1
X2 2
VDDXTAL3.3 3
vSADR/REF3.3 4
GNDREF
5
GNDDIG
6
7
VDDDIG3.3
vOE1#
18 DIF1#
17 DIF1
16 VDDA3.3
15 GNDA
14 DIF0#
13 DIF0
vOE0#
9FGL02xx
ePAD is
GND
8
SCLK_3.3
9 10 11 12
SDATA_3.3
GND
24-pin VFQFPN, 4x4 mm, 0.5mm pitch
^ prefix indicates internal 120KOhm pull up resistor
v prefix indicates internal 120KOhm pull down resistor
SMBus Address Selection Table
State of SADR on first application
of CKPWRGD_PD#
SADR
0
1
Address
1101000
1101010
+
Read/Write Bit
x
x
Power Management Table
CKPWRGD_PD#
SMBus
OE bit
DIF
True O/P
Comp. O/P
REF
0
X
Low
1
Hi-Z
2
Low
1
1
1
Running
Running
Running
1
1
Running
1
1
Disabled
Disabled
1
1
1
0
Disabled Disabled
4
Disabled
1. The output state is set by B11[1:0] (Low/Low default)
2. REF is Hi-Z until the 1st assertion of CKPWRGD_PD# high. After
this, when CKPWRG_PD# is low, REF is disabled unless
Byte3[5]=1, in which case REF is running..
3. Input polarities defined at default values for 9FGLxx41/xx51.
4. See SMBus description for Byte 3, bit 4
Power Connections
Pin Number
VDD
3
7
11,20
16
GND
5,24
6
10,21,25
15
Description
XTAL, REF
Digital Power
DIF outputs
PLL Analog
2-OUTPUT 3.3V PCIE CLOCK GENERATOR
2
GND
DECEMBER 1, 2016
9FGL02 DATASHEET
Pin Descriptions
Pin# Pin Name
1
XIN/CLKIN_25
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
X2
VDDXTAL3.3
vSADR/REF3.3
GNDREF
GNDDIG
VDDDIG3.3
SCLK_3.3
SDATA_3.3
GND
VDD3.3
Type
IN
OUT
PWR
LATCHED
I/O
GND
GND
PWR
IN
I/O
GND
PWR
Pin Description
Crystal input or Reference Clock input. Nominally 25MHz.
Crystal output.
Power supply for XTAL, nominal 3.3V
Latch to select SMBus Address/3.3V LVCMOS copy of X1/REFIN pin
Ground pin for the REF outputs.
Ground pin for digital circuitry
3.3V digital power (dirty power)
Clock pin of SMBus circuitry, 3.3V tolerant.
Data pin for SMBus circuitry, 3.3V tolerant.
Ground pin.
Power supply, nominal 3.3V
Active low input for enabling DIF pair 0. This pin has an internal pull-down.
vOE0#
IN
1 =disable outputs, 0 = enable outputs
DIF0
OUT
Differential true clock output
DIF0#
OUT
Differential Complementary clock output
GNDA
GND
Ground pin for the PLL core.
VDDA3.3
PWR
3.3V power for the PLL core.
DIF1
OUT
Differential true clock output
DIF1#
OUT
Differential Complementary clock output
Active low input for enabling DIF pair 1. This pin has an internal pull-down.
vOE1#
IN
1 =disable outputs, 0 = enable outputs
VDD3.3
PWR
Power supply, nominal 3.3V
GND
GND
Ground pin.
Input notifies device to sample latched inputs and start up on first high assertion.
^CKPWRGD_PD#
IN
Low enters Power Down Mode, subsequent high assertions exit Power Down
Mode. This pin has internal pull-up resistor.
Latched select input to select spread spectrum amount at initial power up :
vSS_EN_tri
LATCHED IN
1 = -0.5% spread, M = -0.25%, 0 = Spread Off
GNDXTAL
GND
GND for XTAL
ePAD
GND
Connect to ground
DECEMBER 1, 2016
3
2-OUTPUT 3.3V PCIE CLOCK GENERATOR
9FGL02 DATASHEET
Test Loads
Low-Power Differential Output Test Load
Terminations
Device
9FGL0241
9FGL0251
9FGL02P1
9FGL0241
9FGL0251
9FGL02P1
Zo (Ω)
100
100
100
85
85
85
Rs (Ω)
None needed
7.5
Prog.
N/A
None needed
Prog.
5 inches
Rs
Zo=100ohm
2pF
2pF
Rs
Note: The device can drive transmission line lengths greater
than those specified by the PCIe SIG
REF Output Test Load
Zo = 50 ohms
33
5pF
REF Output
Alternate Terminations
The 9FGL family can easily drive LVPECL, LVDS, and CML logic. See
“AN-891 Driving LVPECL, LVDS, and CML Logic with
IDT's "Universal" Low-Power HCSL Outputs”
for details.
2-OUTPUT 3.3V PCIE CLOCK GENERATOR
4
DECEMBER 1, 2016
9FGL02 DATASHEET
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the 9FGL02. These ratings, which are standard values
for IDT commercially rated parts, are stress ratings only. Functional operation of the device at these or any other conditions
above those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating
conditions for extended periods can affect product reliability. Electrical parameters are guaranteed only over the recommended
operating temperature range.
PARAMETER
Supply Voltage
Input Voltage
Input High Voltage, SMBus
Storage Temperature
Junction Temperature
Input ESD protection
1
2
SYMBOL
VDDx
V
IN
V
IHSMB
Ts
Tj
ESD prot
CONDITIONS
MIN
-0.5
-0.5
TYP
MAX
4.6
V
DD
+0.5
3.9
150
125
UNITS NOTES
V
V
V
°C
°C
V
1,2
1,3
1
1
1
1
SMBus clock and data pins
-65
Human Body Model
2500
Guaranteed by design and characterization, not 100% tested in production.
Operation under these conditions is neither implied nor guaranteed.
3
Not to exceed 4.6V.
Electrical Characteristics–SMBus Parameters
TA = T
AMB;
Supply Voltages per normal operation conditions, See Test Loads for Loading Conditions
PARAMETER
SMBus Input Low Voltage
SMBus Input High Voltage
SMBus Output Low Voltage
SMBus Sink Current
Nominal Bus Voltage
SCLK/SDATA Rise Time
SCLK/SDATA Fall Time
SMBus Operating
Frequency
1
SYMBOL
V
ILSMB
V
IHSMB
V
OLSMB
I
PULLUP
V
DDSMB
t
RSMB
t
FSMB
f
SMB
CONDITIONS
V
DDSMB
= 3.3V
V
DDSMB
= 3.3V
@ I
PULLUP
@ V
OL
(Max VIL - 0.15) to (Min VIH + 0.15)
(Min VIH + 0.15) to (Max VIL - 0.15)
SMBus operating frequency
MIN
TYP
MAX
0.8
3.6
0.4
3.6
1000
300
500
UNITS NOTES
V
V
V
mA
V
ns
ns
kHz
2.1
4
2.7
1
1
2
Guaranteed by design and characterization, not 100% tested in production.
2.
The device must be powered up for the SMBus to function.
DECEMBER 1, 2016
5
2-OUTPUT 3.3V PCIE CLOCK GENERATOR
