FemtoClock® Crystal-to-3.3V LVPECL
Clock Generator
ICS843031
DATA SHEET
GENERAL DESCRIPTION
FEATURES
The 843031 is a 1 Gigabit Ethernet Clock Generator. The
843031 can synthesize 1 Gigabit Ethernet, SONET, or Serial
ATA reference clock frequencies with the appropriate choice of
crystal and output divider. The 843031 has excellent phase jitter
performance and is packaged in a small 8-pin TSSOP, making
it ideal for use in systems with limited board space.
• One differential 3.3V LVPECL output
• Crystal oscillator interface designed for 18pF parallel resonant
crystals
• Output frequency range: 290MHz - 350MHz
• VCO frequency range: 580MHz - 700MHz
• RMS phase jitter @312.5MHz (1.875MHz - 20MHz):
0.475ps (typical)
RMS phase jitter @318.75MHz (1.875MHz - 20MHz):
0.475ps (typical)
• 3.3V operating supply
• 0°C to 70°C ambient operating temperature
• Available in lead-free (RoHS 6) package
• For functional replacement part use 843031i-01
FREQUENCY TABLE
Inputs
M/N Ratio (Multiplier)
Output Frequency
(MHz)
25.92
12
311.04
26.04166
12
312.5
26.5625
12
318.75
Crystal Frequency (MHz)
BLOCK DIAGRAM
PIN ASSIGNMENT
XTAL_IN
OSC
XTAL-OUT
Phase
Detector
VCO
÷2
Q0
1
2
3
4
8
7
6
5
Q0
nQ0
VCC
PWR_DN
843031
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm
package body
G Package
Top View
÷24
(fixed)
PWR_DN
843031 REVISION A 11/5/15
nQ0
VCC
XTAL_OUT
XTAL_IN
VEE
1
FEMTOCLOCK® CRYSTAL-TO-3.3V LVPECL CLOCK GENERATOR
843031 Data Sheet
TABLE 1. PIN DESCRIPTIONS
Number
Name
Type
Description
1, 6
VCC
Power
Core supply pin.
2, 3
XTAL_OUT,
XTAL_IN
Input
Crystal oscillator interface. XTAL_IN is the input,
XTAL_OUT is the output.
4
VEE
Power
Negative supply pin.
5
PWR_DN
Input
7, 8
nQ0, Q0
Output
Pullup
Output state control input. High impedance when LOW (oscillator stops).
LVCMOS/LVTTL interface levels.
Differential clock outputs. LVPECL interface levels.
NOTE: Pullup refers to internal input resistors. See Table 2, Pin Characterristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol
Parameter
CIN
Input Capacitance
4
pF
RPULLUP
Input Pullup Resistor
51
kΩ
843031 REVISION A 11/5/15
Test Conditions
2
Minimum
Typical
Maximum
Units
FEMTOCLOCK® CRYSTAL-TO-3.3V LVPECL CLOCK GENERATOR
843031 Data Sheet
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC
4.6V
Inputs, VI
-0.5V to VCC + 0.5V
Outputs, IO
Continuous Current
Surge Current
50mA
100mA
Package Thermal Impedance, θJA
101.7°C/W (0 mps)
Storage Temperature, TSTG
-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 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.
TABLE 3A. POWER SUPPLY DC CHARACTERISTICS, VCC = 3.3V±5%, TA=0°C TO 70°C
Symbol
Parameter
VCC
Core Supply Voltage
IEE
Test Conditions
Power Supply Current
Minimum
Typical
Maximum
3.135
3.3
Units
3.465
V
PWR_DN = 1
105
mA
PWR_DN = 0
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