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844031BGI-01LF

P1-P3P4-P6P7-P9P10-P12P13-P14
FemtoClock
®
Crystal-to-LVDS
Clock Generator
844031I-01
DATA SHEET
844031I-01 REVISION A 6/2/16 1 ©2016 Integrated Device Technology, Inc.
GENERAL DESCRIPTION
The 844031I-01 is an Ethernet Clock Generator. The
844031I-01 uses an 18pF parallel resonant crystal over the
range of 19.6MHz - 27.2MHz. For Ethernet applications,
a 25MHz crystal is used to generate 312.5MHz. The
844031I-01 has excellent <1ps phase jitter performance, over the
1.875MHz - 20MHz integration range. The 844031I-01 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
(19.6MHz - 27.2MHz)
• Output frequency range: 245MHz - 340MHz
• VCO range: 490MHz - 680MHz
• RMS phase jitter @ 312.5MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.53ps (typical), @ 3.3V
• 3.3V or 2.5V operating supply
• -40°C to 85°C ambient operating temperature
• Available in lead-free (RoHS 6) package
•
For functional replacement use 8T49N242
844031I-01
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm
package body
G Package
Top View
VDDA
GND
XTAL_OUT
XTAL_IN
1
2
3
4
VDD
Q
nQ
OE
8
7
6
5
BLOCK DIAGRAM
COMMON CONFIGURATION TABLE
PIN ASSIGNMENT
Inputs
Output Frequency
(MHz)
Crystal Frequency (MHz) M N
Multiplication
Value M/N
25 25 2 12.5 312.5
PRODUCT DISCONTINUATION NOTICE - LAST TIME BUY EXPIRES MAY 6, 2017
FEMTOCLOCKS™ CRYSTAL-TO-LVDS
CLOCK GENERATOR
844031I-01 DATA SHEET
2 REVISION A 6/2/16
TABLE 2. PIN CHARACTERISTICS
TABLE 1. PIN DESCRIPTIONS
Symbol Parameter Test Conditions Minimum Typical Maximum Units
C
IN
Input Capacitance 4 pF
R
PULLUP
Input Pullup Resistor 51
kΩ
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 OE Input Pullup
Output enable pin. When HIGH, Q/nQ output is active.
When LOW, the Q/nQ output is in a high impedance state. LVC-
MOS/LVTTL interface levels.
6, 7 nQ, Q Output Differential clock outputs. LVDS interface levels.
8V
DD
Power Core supply pin.
NOTE: Pullup refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
REVISION A 6/2/16
844031I-01 DATA SHEET
3 FEMTOCLOCKS™ CRYSTAL-TO-LVDS
CLOCK GENERATOR
NOTE: Stresses beyond those listed under Absolute
Maximum Ratings may cause permanent damage to the
device. These ratings are stress specifi cations 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 ex-
tended periods may affect product reliability.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
DD
4.6V
Inputs, V
I
-0.5V to V
DD
+ 0.5 V
Outputs, I
O
(LVDS)
Continuous Current 10mA
Surge Current 15mA
Package Thermal Impedance, θ
JA
129.5°C/W (0 mps)
Storage Temperature, T
STG
-65°C to 150°C
TABLE 3A. POWER SUPPLY DC CHARACTERISTICS, V
DD
= 3.3V±5%, TA = -40°C TO 85°C
TABLE 3C. LVCMOS/LVTTL DC CHARACTERISTICS, V
DD
= 3.3V±5% OR 2.5V±5%, TA = -40°C TO 85°C
TABLE 3D. LVDS DC CHARACTERISTICS, V
DD
= 3.3V±5%, TA = -40°C TO 85°C
TABLE 3B. POWER SUPPLY DC CHARACTERISTICS, V
DD
= 2.5V±5%, TA = -40°C TO 85°C
Symbol Parameter Test Conditions Minimum Typical Maximum Units
V
DD
Core Supply Voltage 3.135 3.3 3.465 V
V
DDA
Analog Supply Voltage V
DD
– 0.10 3.3 V
DD
V
I
DD
Power Supply Current 75 mA
I
DDA
Analog Supply Current 10 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 OE V
DD
= V
IN
= 3.465V or 2.625V 5 µA
I
IL
Input Low Current OE V
DD
= 3.465V or 2.625V, V
IN
= 0V -150 µA
Symbol Parameter Test Conditions Minimum Typical Maximum Units
V
OD
Differential Output Voltage 275 425 mV
Δ V
OD
V
OD
Magnitude Change 50 mV
V
OS
Offset Voltage 1.15 1.33 1.45 V
Δ V
OS
V
OS
Magnitude Change 50 mV
NOTE: Please refer to Parameter Measurement Information for output information.
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
– 0.10 2.5 V
DD
V
I
DD
Power Supply Current 70 mA
I
DDA
Analog Supply Current 10 mA
P1-P3P4-P6P7-P9P10-P12P13-P14

844031BGI-01LF

Mfr. #:
Buy 844031BGI-01LF
Manufacturer:
IDT
Description:
Clock Generators & Support Products LVDS OUT FEMTOCLOCK
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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