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ICS83904-02

CRYSTAL-TOLVCMOS/LVTTL FANOUT BUFFER


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ICS83904-02 pdf
LOW SKEW, 1-TO-4, CRYSTAL-TO-
LVCMOS/LVTTL FANOUT BUFFER
GENERAL DESCRIPTION
The ICS83904-02 is a low skew, high perfor-
ICS mance 1-to-4 Crystal Oscillator/Crystal-to-LVCMOS
HiPerClockS™ Fanout Buffer and a member of the HiPerClockS™
family of High Performance Clock Solutions from IDT.
The ICS83904-02 has selectable single-ended clock
or two crystal-oscillator inputs. There is an output enable to
disable the outputs by placing them into a high-impedance state.
www.DataGShueaert4aUn.tceoemd output and par t-to-par t skew characteristics
make the ICS83904-02 ideal for those applications demand-
ing well defined performance and repeatability.
BLOCK DIAGRAM
OE Pullup
CLK_SEL0 Pulldown
CLK_SEL1 Pulldown
ICS83904-02
FEATURES
Four LVCMOS/LVTTL outputs,
19Ω typical output impedance @ VDD = VDDO = 3.3V
Two Crystal oscillator input pairs
One LVCMOS/LVTTL clock input
Crystal input frequencry range: 12MHz – 38.88MHz
Output frequency: 200MHz (maximum)
Output Skew: 40ps (maximum) @ VDD = VDDO = 3.3V
• RMS phase jitter @ 25MHz output, using a 25MHz crystal
(100Hz – 1MHz): 0.16ps (typical) @ V = V = 3.3V
DD DDO
• RMS phase noise at 25MHz:
Offset
Noise Power
100Hz ............. -118.4 dBc/Hz
1kHz ............. -141.5 dBc/Hz
10kHz ............. -157.2 dBc/Hz
100kHz ............. -157.2 dBc/Hz
Supply Voltage Modes:
(Core/Output)
3.3V/3.3V
3.3V/2.5V
3.3V/1.8V
2.5V/2.5V
2.5V/1.8V
0°C to 70°C ambient operating temperature
Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
XTAL_IN0
XTAL_OUT0
OSC
00
XTAL_IN1
XTAL_OUT1
OSC
CLK Pulldown
01
10
11
PIN ASSIGNMENT
Q0
CLK_SEL0 1
16 VDDO
XTAL_OUT0 2 15 Q0
XTAL_IN0 3 14 Q1
VDD 4
13 GND
Q1 XTAL_IN1 5 12 Q2
XTAL_OUT1 6 11 Q3
CLK_SEL1 7
10 VDDO
CLK 8
9 OE
Q2 ICS83904-02
16-Lead TSSOP
4.4mm x 5.0mm x 0.92mm
package body
Q3
G Package
Top View
IDT/ ICSLVCMOS/LVTTL FANOUT BUFFER
1 ICS83904AG-02 REV. A SEPTEMBER 12, 2007



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ICS83904-02 pdf
ICS83904-02
LOW SKEW, 1-TO-4, CRYSTAL-TO-LVCMOS/LVTTL FANOUT BUFFER
TABLE 1. PIN DESCRIPTIONS
Number
1, 7
2, 3
4
5, 6
8
9
www.DataSheet4U.com
10, 16
11, 12, 14, 15
Name
CLK_SEL0,
CLK_SEL1
XTAL_OUT0,
XTAL_IN0
VDD
XTAL_IN1,
XTAL_OUT1
CLK
OE
VDDO
Q3, Q2, Q1, Q0
Type
Description
Input
Input
Pulldown
Clock select inputs. See Table 3, Input Reference Function Table.
LVCMOS / LVTTL interface levels.
Crystal oscillator interface. XTAL_IN0 is the input.
XTAL_OUT0 is the output.
Power
Positive supply pin.
Input
Crystal oscillator interface. XTAL_IN1 is the input.
XTAL_OUT1 is the output.
Input Pulldown Single-ended clock input. LVCMOS/LVTTL interface levels.
Input
Pullup
Output enable. When LOW, outputs are in HIGH impedance state.
When HIGH, outputs are active. LVCMOS / LVTTL interface levels.
Power
Output supply pins.
Output
Single-ended clock outputs. LVCMOS/LVTTL interface levels.
13
GND
Power
Power supply ground.
NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol
CIN
RPULLUP
RPULLDOWN
Parameter
Input Capacitance
Input Pullup Resistor
Input Pulldown Resistor
CPD
Power Dissipation Capacitance
(per output)
ROUT
Output Impedance
Test Conditions
VDDO = 3.465V
VDDO = 2.625V
VDDO = 2.0V
VDDO = 3.3V
VDDO = 2.5V
VDDO = 1.8V
Minimum
Typical
4
51
51
8
7
7
19
21
32
Maximum
Units
pF
kΩ
kΩ
pF
pF
pF
Ω
Ω
Ω
TABLE 3. INPUT REFERENCE FUNCTION TABLE
Control Inputs
CLK_SEL1 CLK_SEL0
00
01
10
11
Reference
XTAL0 (default)
XTAL1
CLK
CLK
IDT/ ICSLVCMOS/LVTTL FANOUT BUFFER
2 ICS83904AG-02 REV. A SEPTEMBER 12, 2007



Part Number ICS83904-02
Description CRYSTAL-TOLVCMOS/LVTTL FANOUT BUFFER
Maker Integrated Device Technology - Integrated Device Technology
Total Page 15 Pages
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