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844071AGLF

P1-P3P4-P6P7-P9P10-P12P13-P14
DATA SHEET
FemtoClock® Crystal-to-LVDS
Clock Generator
844071
844071 Rev B 11/17/15 1 ©2015 Integrated Device Technology, Inc.
General Description
The 844071 is a Serial ATA (SATA)/Serial Attached SCSI (SAS)
Clock Generator. The 844071 uses an 18pF parallel resonant crystal
over the range of 20.833MHz - 28.3MHz. For SATA/SAS
applications, a 25MHz crystal is used and either 75MHz or 150MHz
may be selected with the FREQ_SEL pin. The 844071 has excellent
<1ps phase jitter performance, over the 900kHz - 7.5MHz integration
range. The 844071 is packaged in a small 8-pin TSSOP, making it
ideal for use in systems with limited board space.
Features
• One differential LVDS output
• Crystal oscillator interface, 18pF parallel resonant crystal
(20.833MHz – 28.3MHz)
• Output frequency range: 62.5MHz – 170MHz
• VCO range: 500MHz – 680MHz
• RMS phase jitter at 150MHz, using a 25MHz crystal
(900kHz – 7.5MHz): 0.45ps (typical)
• Full 3.3V or 2.5V operating supply
• 0°C to 70°C ambient operating temperature
• Available in lead-free (RoHS 6) packages
Table 1. Common Configuration Table
Block Diagram
Inputs
Output Frequency (MHz)Crystal Frequency (MHz) FREQ_SEL M N Multiplication Value M/N
25 0 24 4 6 150
25 1 24 8 3 75
26.041666 0 24 4 6 156.25
26.041666 1 24 8 3 78.125
26.5625 0 24 4 6 159.375
26.5625 1 24 8 3 79.675
OSC
Phase
Detector
VCO
500MHz - 680MHz
M = ÷24 (fixed)
FREQ_SEL N
0 ÷4
1 ÷8
Q
nQ
FREQ_SEL
XTAL_IN
XTAL_OUT
Pullup
(Default)
1
2
3
4
8
7
6
5
V
DDA
GND
XTAL_OUT
XTAL_IN
V
DD
Q
nQ
FREQ_SEL
Pin Assignment
844071
8 Lead TSSOP
4.40mm x 3.0mm x 0.925mm
package body
G Package
Top View
Rev B 11/17/15 2 FEMTOCLOCK® CRYSTAL-TO-LVDS CLOCK GENERATOR
844071 DATA SHEET
Table 1. Pin Descriptions
NOTE: Pullup refers to an internal input resistor. See Table 2, Pin Characteristics, for typical values.
Table 2. Pin Characteristics
Number Name Type Description
1V
DDA
Power Analog supply pin.
2 GND Power Power supply ground.
3,
4
XTAL_OUT
XTAL_IN
Input Crystal oscillator interface. XTAL_IN is the input, XTAL_OUT is the output.
5 FREQ_SEL Input Pullup Frequency select pin. LVCMOS/LVTTL interface levels.
6, 7 nQ, Q Output Differential output pair. LVDS interface levels.
8V
DD
Power Core supply pin.
Symbol Parameter Test Conditions Minimum Typical Maximum Units
C
IN
Input Capacitance 4pF
R
PULLUP
Input Pullup Resistor 51 k
FEMTOCLOCK® CRYSTAL-TO-LVDS CLOCK GENERATOR 3 Rev B 11/17/15
844071 DATA SHEET
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 3A. Power Supply DC Characteristics, V
DD
= 3.3V ± 10%, T
A
= 0°C to 70°C
Table 3B. Power Supply DC Characteristics, V
DD
= 2.5V ± 5%, T
A
= 0°C to 70°C
Table 3C. LVCMOS/LVTTL DC Characteristics, V
DD
= 3.3V ± 10% or 2.5V ± 5%, T
A
= 0°C to 70°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
101.7C/W (0 mps)
Storage Temperature, T
STG
-65C to 150C
Symbol Parameter Test Conditions Minimum Typical Maximum Units
V
DD
Core Supply Voltage 2.97 3.3 3.63 V
V
DDA
Analog Supply Voltage V
DD
– 0.12 3.3 3.63 V
I
DD
Power Supply Current 135 mA
I
DDA
Analog Supply Current 12 mA
Symbol Parameter Test Conditions Minimum Typical Maximum Units
V
DD
Core Supply Voltage 2.375 2.5 2.625 V
V
DDA
Analog Supply Voltage V
DD
– 0.12 2.5 2.625 V
I
DD
Power Supply Current 120 mA
I
DDA
Analog Supply Current 12 mA
Symbol Parameter Test Conditions Minimum Typical Maximum Units
V
IH
Input High Voltage
V
DD
= 3.3V 2 V
DD
+ 0.3 V
V
DD
= 2.5V 1.7 V
DD
+ 0.3 V
V
IL
Input Low Voltage
V
DD
= 3.3V -0.3 0.8 V
V
DD
= 2.5V -0.3 0.7 V
I
IH
Input High Current V
DD
= V
IN
= 3.63V or 2.625V 5 µA
I
IL
Input Low Current V
DD
= 3.63V or 2.625V, V
IN
= 0V -150 µA
P1-P3P4-P6P7-P9P10-P12P13-P14

844071AGLF

Mfr. #:
Buy 844071AGLF
Manufacturer:
IDT
Description:
Clock Generators & Support Products SATA & SAS FemtoClk Synthesizer LVDS
Lifecycle:
New from this manufacturer.
Delivery:
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