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844001AGLF

P1-P3P4-P6P7-P9P10-P12P13-P14
Femtoclocks™ Crystal-to-LVDS
Clock Generator
844001
Data Sheet
©2016 Integrated Device Technology, Inc June 2, 20161
PRODUCT DISCONTINUATION NOTICE - LAST TIME BUY EXPIRES MAY 6, 2017
GENERAL DESCRIPTION
The 844001 is a Fibre Channel Clock Generator. The 844001 uses an
18pF parallel resonant crystal over the range of 20.4MHz - 28.3MHz.
For Fibre Channel applications, a 26.5625MHz crystal is used. The
frequency select pin allows the device to generate either 106.25MHz
or 212.5MHz from a 26.5625MHz crystal. To generate 187.5MHz for
12Gb Ethernet, a 23.4375MHz crystal is used. The 844001 uses IDT’s
3
rd
generation low phase noise VCO technology and can achieve
<1ps typical rms phase jitter, easily meeting Fibre Channel and
Ethernet jitter requirements. The 844001 is packaged in a small 8-pin
TSSOP, making it ideal for use in systems with limited board space.
NOTE: It is not recommended to overdrive the crystal input with an
external clock.
FEATURES
• One Differential LVDS output
• Crystal oscillator interface, 18pF parallel resonant crystal
(20.4MHz - 28.3MHz)
• Output frequency range: 81.66MHz - 226.66MHz
• VCO range: 490MHz - 680MHz
• RMS phase jitter @ 106.25MHz, using a 26.5625MHz crystal
(637kHz - 10MHz): 0.74ps (typical)
• 3.3V or 2.5V operating supply
• 0°C to 70°C ambient operating temperature
• Available in lead-free (RoHS 6) package
•
For functional replacement part use 8T49N242
VDDA
GND
XTAL_OUT
XTAL_IN
1
2
3
4
VDD
Q
nQ
FREQ_SEL
8
7
6
5
BLOCK DIAGRAM
COMMON CONFIGURATION T ABLE - FIBRE CHANNEL, 12Gb ETHERNET
PIN ASSIGNMENT
Inputs
Output Frequency
(MHz)
Crystal Frequency (MHz) FREQ_SEL M N
Multiplication
Value M/N
26.5625 1 24 6 4 106.25
26.5625 0 24 3 8 212.5
23.4375 0 24 3 8 187.5
844001
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm
package body
G Package
Top View
844001 Data Sheet
©2016 Integrated Device Technology, Inc June 2, 20162
TABLE 2. PIN CHARACTERISTICS
TABLE 1. PIN DESCRIPTIONS
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.
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.
Symbol Parameter Test Conditions Minimum Typical Maximum Units
C
IN
Input Capacitance 4 pF
R
PULLUP
Input Pullup Resistor 51
kΩ
844001 Data Sheet
©2016 Integrated Device Technology, Inc June 2, 20163
TABLE 3A. POWER SUPPLY DC CHARACTERISTICS, V
DD
= V
DDA
= 3.3V±5%, TA = 0°C TO 70°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
– 0.12 3.3 V
DD
V
I
DD
Power Supply Current 115 mA
I
DDA
Analog Supply Current 12 mA
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
101.7°C/W (0 mps)
Storage Temperature, T
STG
-65°C to 150°C
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.
TABLE 3C. LVCMOS/LVTTL DC CHARACTERISTICS, V
DD
= V
DDA
= 3.3V±5% OR 2.5V±5%, TA = 0°C TO 70°C
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 FREQ_SEL V
DD
= V
IN
= 3.465V or 2.625V 5 µA
I
IL
Input Low Current FREQ_SEL V
DD
= 3.465V or 2.625V, V
IN
= 0V -150 µA
TABLE 3D. LVDS DC CHARACTERISTICS, V
DD
= V
DDA
= 3.3V±5%, TA = 0°C TO 70°C
TABLE 3B. POWER SUPPLY DC CHARACTERISTICS, V
DD
= V
DDA
= 2.5V±5%, TA = 0°C TO 70°C
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 V
DD
V
I
DD
Power Supply Current 110 mA
I
DDA
Analog Supply Current 12 mA
Symbol Parameter Test Conditions Minimum Typical Maximum Units
V
OD
Differential Output Voltage 350 415 480 mV
Δ V
OD
V
OD
Magnitude Change 50 mV
V
OS
Offset Voltage 1.225 1.325 1.425 V
Δ V
OS
V
OS
Magnitude Change 50 mV
NOTE: Please refer to Parameter Measurement Information for output information.
P1-P3P4-P6P7-P9P10-P12P13-P14

844001AGLF

Mfr. #:
Buy 844001AGLF
Manufacturer:
IDT
Description:
Clock Generators & Support Products FC1/FC2 FemtoClock LVDS Synthesize
Lifecycle:
New from this manufacturer.
Delivery:
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