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844031BG-01LF

P1-P3P4-P6P7-P9P10-P12P13-P14
FemtoClock
®
Crystal-to-LVDS
Clock Generator
844031-01
DATA SHEET
844031-01 REVISION A 6/2/16 1 ©2016 Integrated Device Technology, Inc.
PRODUCT DISCONTINUATION NOTICE - LAST TIME BUY EXPIRES MAY 6, 2017
GENERAL DESCRIPTION
The 844031-01 is an Ethernet Clock Generator. The 844031-01
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 844031-01 has excellent <1ps phase jitter
performance, over the 1.875MHz - 20MHz integration range. The
844031-01 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 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
844031-01
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
OSC
Phase
Detector
VCO
490MHz - 680MHz
M = ÷25 (fixed)
N = ÷2 (fixed)
Q
nQ
Pullup
OE
XTAL_IN
XTAL_OUT
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
FEMTOCLOCKS™ CRYSTAL-TO-LVDS
CLOCK GENERATORY
844031-01 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.
LVCMOS/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
844031-01 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 = 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
– 0.10 3.3 V
DD
V
I
DD
Power Supply Current 75 mA
I
DDA
Analog Supply Current 10 mA
TABLE 3C. LVCMOS/LVTTL DC CHARACTERISTICS, V
DD
= 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 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
TABLE 3D. LVDS DC CHARACTERISTICS, V
DD
= 3.3V±5%, TA = 0°C TO 70°C
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.
TABLE 3B. POWER SUPPLY DC CHARACTERISTICS, V
DD
= 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
– 0.10 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

844031BG-01LF

Mfr. #:
Buy 844031BG-01LF
Manufacturer:
IDT
Description:
Clock Generators & Support Products LVDS OUT FEMTOCLOCK
Lifecycle:
New from this manufacturer.
Delivery:
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