OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

844441DMI-150LFT

P1-P3P4-P6P7-P9P10-P12P13-P15
1©2016 Integrated Device Technology, Inc. Revison E, November 2, 2016
General Description
The 844441 is a low jitter, high performance clock generator and a
member of the FemtoClock
®
family of silicon timing products. The
844441 is designed for use in applications using the SAS and SATA
interconnect. The 844441 uses an external, 25MHz, parallel
resonant crystal to generate four selectable output frequencies:
75MHz, 100MHz, 150MHz, and 300MHz. This silicon based
approach provides excellent frequency stability and reliability. The
844441 features down and center spread spectrum (SSC) clocking
techniques.
Applications
• SAS/SATA Host Bus Adapters
• SATA Port Multipliers
• SAS I/O Controllers
• TapeDrive and HDD Array Controllers
• SAS Edge and Fanout Expanders
• HDDs and TapeDrives
• Disk Storage Enterprise
Features
• Designed for use in SAS, SAS-2, and SATA systems
• Center (±0.17%) Spread Spectrum Clocking (SSC)
• Down (-0.23% or -0.5%) SSC
• Better frequency stability than SAW oscillators
• One differential 2.5V LVDS output
• Crystal oscillator interface designed for 25MHz
(C
L
= 12pF) frequency
• External fundamental crystal frequency ensures high reliability
and low aging
• Selectable output frequencies: 75MHz, 100MHz, 150MHz,
300MHz
• Output frequency is tunable with external capacitors
• RMS phase jitter @ 100MHz, using a 25MHz crystal
(12kHz – 20MHz): 1.1936ps (typical)
• 2.5V operating supply
• -40°C to 85°C ambient operating temperature
• Lead-free (RoHS 6) packaging
Block Diagrams
FemtoClock™
PLL
OSC
nPLL_SEL
1
0
25MHz
XTAL
XTAL_IN
XTAL_OUT
00 = 75MHz
01 = 100MHz
10 = 150MHz
(default)
11 = 300MHz
Q
nQ
SSC_SEL(1:0)
F_SEL(1:0)
Clock Output
Control Logic
16-Lead TSSOP
FemtoClock™
PLL
OSC
25MHz
XTAL
XTAL_IN
XTAL_OUT
00 = SSC Off
01 = 0.5% Down-spread
10 = 0.23% Down-spread
11 = 0.5% Center-spread
Q
nQ
SSC_SEL(1:0)
SSC Output
Control Logic
8-Lead SOIC
Pulldown
Pullup:Pulldown
Pulldown:Pulldown
Pulldown:Pulldown
Pin Assignment
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
nc
SSC_SEL0
XTAL_IN
XTAL_OUT
GND
F_SEL1
nPLL_SEL
nQ
Q
V
DD
F_SEL0
V
D
D
SSC_SEL1
GND
nc
nc
844441
16-Lead TSSOP, 4.4mm x 5.0mm Package
1
2
3
4
8
7
6
5
V
DD
XTAL_OUT
XTAL_IN
SSC_SEL0
GND
Q
nQ
SSC_SEL1
844441
8-Lead SOIC, 3.90mm x 4.90mm Package
844441
Datasheet
FemtoClock® SAS/ SATA Clock Generator
2©2016 Integrated Device Technology, Inc. Revison E, November 2, 2016
844441 Datasheet
Pin Description and Pin Characteristic Tables
Table 1. Pin Descriptions
NOTE: Pullup/Pulldown refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
Table 2. Pin Characteristics
Function Tables
Table 3A. SSC_SEL[1:0] Function Table Table 3B. F_SEL[1:0] Function Table
Name Type Description
XTAL_OUT,
XTAL_IN
Input Crystal oscillator interface. XTAL_IN is the input, XTAL_OUT is the output.
SSC_SEL0,
SSC_SEL1
Input Pulldown SSC select pins. See Table 3A. LVCMOS/LVTTL interface levels.
F_SEL0 Input Pulldown Output frequency select pin. See Table 3B. LVCMOS/LVTTL interface levels.
F_SEL1 Input Pullup Output frequency select pin. See Table 3B. LVCMOS/LVTTL interface levels.
nPLL_SEL Input Pulldown PLL Bypass pin. LVCMOS/LVTTL interface levels.
Q, nQ Output Differential clock outputs. LVDS interface levels.
GND Power Power supply ground.
V
DD
Power Power supply pin.
nc Unused No connect.
Symbol Parameter Test Conditions Minimum Typical Maximum Units
C
IN
Input Capacitance nPLL_SEL, F_SEL[1:0], SSC_SEL[1:0] 4 pF
R
PULLDOWN
Input Pulldown Resistor 51 k
R
PULLUP
Input Pullup Resistor 51 k
Inputs
ModeSSC_SEL1 SSC_SEL0
0 (default) 0 (default) SSC Off
0 1 0.5% Down-spread
1 0 0.23% Down-spread
1 1 0.34% Center-spread
Inputs
Output Frequency (MHz)F_SEL1 F_SEL0
00 75
01 100
1 (default) 0 (default) 150
11 300
3©2016 Integrated Device Technology, Inc. Revison E, November 2, 2016
844441 Datasheet
Absolute Maximum Ratings
NOTE: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are stress
specifications only. Functional operation of product at these conditions or any conditions beyond those listed in the DC Characteristics or AC
Characteristics is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product reliability.
DC Electrical Characteristics
Table 4A. Power Supply DC Characteristics, V
DD
= 2.5V ± 5%, T
A
= -40°C to 85°C
Table 4B. LVCMOS/LVTTL DC Characteristics,V
DD
= 2.5V ± 5%, T
A
= -40°C to 85°C
Table 4C. LVDS DC Characteristics, V
DD
= 2.5V ± 5%, T
A
= -40°C to 85°C
Item Rating
Supply Voltage, V
DD
4.6V
Inputs, V
I
-0.5V to V
DD
+ 0.5V
Outputs, I
O
Continuous Current
Surge Current
10mA
15mA
Package Thermal Impedance,
JA
16 Lead TSSOP
8 Lead SOIC
81.2°C/W (0 mps)
96.0°C/W (0 lfpm)
Storage Temperature, T
STG
-65C to 150C
Symbol Parameter Test Conditions Minimum Typical Maximum Units
V
DD
Power Supply Voltage 2.375 2.5 2.625 V
I
DD
Power Supply Current 73 mA
Symbol Parameter Test Conditions Minimum Typical Maximum Units
V
IH
Input High Voltage 1.7 V
DD
+ 0.3 V
V
IL
Input Low Voltage -0.3 0.7 V
I
IH
Input
High
Current
F_SEL1 V
DD
= V
IN
= 2.5V 5 µA
SSC_SEL[0:1],
F_SEL0, nPLL_SEL
V
DD
= V
IN
= 2.5V 150 µA
I
IL
Input
Low
Current
F_SEL1 V
DD
= 2.5V, V
IN
= 0V -150 µA
SSC_SEL[0:1],
F_SEL0, nPLL_SEL
V
DD
= 2.5V, V
IN
= 0V -5 µA
Symbol Parameter Test Conditions Minimum Typical Maximum Units
V
OD
Differential Output Voltage 200 454 mV
V
OD
V
OD
Magnitude Change 50 mV
V
OS
Offset Voltage 1 1.375 V
V
OS
V
OS
Magnitude Change 50 mV
P1-P3P4-P6P7-P9P10-P12P13-P15

844441DMI-150LFT

Mfr. #:
Buy 844441DMI-150LFT
Manufacturer:
Description:
IC GENERATR CLK SAS/SATA 8SOIC
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet