FEMTOCLOCK™ CRYSTAL-TO-
3.3V LVPECL FREQUENCY SYNTHESIZER
ICS843204I
G
ENERAL
D
ESCRIPTION
The ICS843204I is a 4 output LVPECL Synthesizer
optimized to generate Gigabit Ethernet and SONET
HiPerClockS™
reference clock frequencies and is a member of the
HiPerClocks
TM
family of high performance clock
solutions from IDT. Using a 19.44MHz and 25MHz,
18pF parallel resonant crystal, 155.52MHz and 156.25MHz
frequencies can be generated. The ICS843204I uses IDT’s
FemtoClock
TM
low phase noise VCO technology and can achieve
1ps or lower typical RMS phase jitter. The ICS843204I is pack-
aged in a 48-pin TSSOP package.
F
EATURES
• Four 3.3V LVPECL outputs
• Selectable crystal oscillator interface
or LVCMOS/LVTTL single-ended input
• Supports the following output frequencies: 155.52MHz
and 156.25MHz
• VCO range: 560MHz - 680MHz
• RMS phase jitter @ 155.52MHz, using a 19.44MHz crystal
(12kHz - 20MHz): 0.98ps (typical)
• RMS phase jitter @ 156.25MHz, using a 19.44MHz crystal
(1.875MHz - 20MHz): 0.52ps (typical)
• Full 3.3V supply mode
• -40°C to 85°C ambient operating temperature
• Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
IC
S
B
LOCK
D
IAGRAM
nPLL_BYPASS_A
Pullup
IN_SELA
Pullup
CLK0
Pulldown
25MHz
P
IN
A
SSIGNMENT
nQA1
QA1
nQA0
QA0
nc
V
CCO
_
A
SELA1
SELA0
nPLL_BYPASS_A
nc
nc
nc
nc
XTAL_IN1
XTAL_OUT1
CLK1
IN_SEL_B
nPLL_BYPASS_B
V
CCO
_
B
nc
QB0
nQB0
QB1
nQB1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
IN_SEL_A
CLK0
XTAL_IN0
XTAL_OUT0
nc
V
EE
OEA0
OEA1
V
CC
V
CCA
_
A
nc
nc
SELB0
V
EE
OEB0
OEB1
V
CC
SELB1
V
CCA
_
B
nc
nc
nc
nc
nc
SELA0
OEA0
QA0
XTAL_IN0
OSC
XTAL_OUT0
PLL
÷4
156.25MHz
0
1
SELA1
OEA1
QA1
nQA1
nQA0
625MHz
0
1
nPLL_BYPASS_B
Pullup
IN_SELB
Pullup
CLK1
Pulldown
19.44MHz
SELB0
OEB0
QB0
nQB0
XTAL_IN1
0
OSC
XTAL_OUT1
PLL
622.08MHz
÷4
155.52MHz
1
SELB0
OEB1
ICS843204I
QB1
nQB1
0
1
48 Lead TSSOP
6.1mm x 12.5mm x 0.925mm
package body
G Package
Top View
IDT
™
/ ICS
™
3.3V LVPECL FREQUENCY SYNTHESIZER
1
ICS843204AGI REV. A MARCH 18, 2009
ICS843204I
FEMTOCLOCK™ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
T
ABLE
1. P
IN
D
ESCRIPTIONS
Number
1, 2
3, 4
5, 10, 11, 12,
13, 20, 25, 26,
27, 28, 29, 37,
38, 44
6
7
8
9
14,
15
16, 47
2 1, 22
17
18
19
23, 24
31
30
32, 40
Name
nQA1, QA1
nQA0, QA0
nc
V
CCO_A
SELA1
SELA0
nPLL_BYPASS_A
XTAL_IN1,
XTAL_OUT1
CLK1, CLK0
QB0, nQB0
IN_SEL_B
nPLL_BYPASS_B
V
CCO_B
QB1, nQB1
SELB1
V
CCA_B
V
CC
Type
Output
Output
Unused
Power
Input
Input
Input
Input
Input
Ouput
Input
Input
Power
Ouput
Input
Power
Power
Pullup
Pullup
Pullup
Description
Differential output pair. LVPECL interface levels.
Differential output pair. LVPECL interface levels.
No connect.
Output supply pin for Bank A outputs.
Select pin. When HIGH, selects QA1/nQA1 at 155.52MHz. When LOW,
Pulldown
selects QA1/nQA1 at 156.25MHz. LVCMOS/LVTTL interface levels.
Select pin. When HIGH, selects QA0/nQA0 at 155.52MHz. When LOW,
Pulldown
selects QA1/nQA1 at 156.25MHz. LVCMOS/LVTTL interface levels.
When LOW, PLL is bypassed. When HIGH, PLL output is active.
Pullup
LVCMOS/LVTTL interface levels.
Parallel resonant cr ystal interface. XTAL_OUT1 is the output,
XTAL_IN1 is the input.
Pulldown LVCMOS/LVTTL clock inputs.
Differential output pair. LVPECL interface levels.
Select pin. When HIGH, selects XTAL1 inputs. When LOW, selects
CLK1 input. LVCMOS/LVTTL interface levels.
When LOW, PLL is bypassed. When HIGH, PLL output is active.
LVCMOS/LVTTL interface levels.
Output supply pin for Bank B outputs.
Differential output pair. LVPECL interface levels.
Select pin. When HIGH, selects QB1/nQB1 at 155.52MHz. When LOW,
selects QB1/nQB1 at 156.25MHz. LVCMOS/LVTTL interface levels.
Analog supply pin for Bank B outputs.
Core supply pins.
Output enable pin. When HIGH, QB1/nQB1 outputs are enable.
33
OEB1
Input
Pullup
LVCMOS/LVTTL interface levels.
Output enable pin. When HIGH, QB0/nQB0 outputs are enabled.
34
OEB0
Input
Pullup
LVCMOS/LVTTL interface levels.
Power
Negative supply pins.
3 5, 43
V
EE
Select pin. When HIGH, selects QB0/nQB0 at 155.52MHz. When LOW,
36
SELB0
Input
Pullup
selects QB0/nQB0 at 156.25MHz. LVCMOS/LVTTL interface levels.
Power
Analog supply pin for Bank A outputs.
39
V
CCA_A
Output enable pin. When HIGH, QA1/nQA1 outputs are enabled.
41
OEA1
Input
Pullup
LVCMOS/LVTTL interface levels.
Output enable pin. When HIGH, QA0/nQA0 outputs are enabled.
42
OEA0
Input
Pullup
LVCMOS/LVTTL interface levels.
45,
XTAL_OUT0,
Parallel resonant cr ystal interface. XTAL_OUT0 is the output,
Input
XTAL_IN0 is the input.
46
XTAL_IN0
Select pin. When HIGH, selects XTAL0 inputs. When LOW, selects
48
IN_SEL_A
Input
Pullup
CLK0 input. LVCMOS/LVTTL interface levels.
NOTE:
Pullup and Pulldown
refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
T
ABLE
2. P
IN
C
HARACTERISTICS
Symbol
C
IN
R
PULLDOWN
R
PULLUP
Parameter
Input Capacitance
Input Pulldown Resistor
Input Pullup Resistor
Test Conditions
Minimum
Typical
4
51
51
Maximum
Units
pF
kΩ
kΩ
IDT
™
/ ICS
™
3.3V LVPECL FREQUENCY SYNTHESIZER
2
ICS843204AGI REV. A MARCH 18, 2009
ICS843204I
FEMTOCLOCK™ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
A
BSOLUTE
M
AXIMUM
R
ATINGS
Supply Voltage, V
CC
Inputs, V
I
Outputs, I
O
Continuous Current
Surge Current
4.6V
-0.5V to V
CC
+ 0.5V
50mA
100mA
NOTE: Stresses beyond those listed under Absolute
Maximum Ratings may cause per manent damage to the
device. These ratings are stress specifications only. Functional op-
eration 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.
Package Thermal Impedance,
θ
JA
54.8°C/W (0 mps)
Storage Temperature, T
STG
-65°C to 150°C
T
ABLE
3A. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
CC
= V
CCO_A
= V
CCO_B
= 3.3V±10%, V
EE
= 0V, T
A
= -40°C
TO
85°C
Symbol
V
CC
V
CCA_A
+
V
CCA_B
V
CCO_A,
V
CCO_B
I
EE
I
CC
I
CCA_A
+ I
CCA_B
I
CCO_A
+ I
CCO_B
Parameter
Core Supply Voltage
Analog Supply Voltage
Output Supply Voltage
Power Supply Current
Core Supply Current
Analog Supply Current
Output Supply Current
Test Conditions
Minimum
2.97
V
CC
– 0.22
2.97
Typical
3.3
3.3
3.3
Maximum
3.63
V
CC
3.63
170
125
22
23
Units
V
V
V
mA
mA
mA
mA
T
ABLE
3B. LVCMOS / LVTTL DC C
HARACTERISTICS
,
V
CC
= V
CCO_A
= V
CCO_B
= 3.3V±10%, V
EE
= 0V, T
A
= -40°C
TO
85°C
Symbol
V
IH
V
IL
Parameter
Input High Voltage
Input
Low Voltage
CLK0, CLK1,
SELA0, SELA1
I
IH
Input
High Current
nPLL_BYPASS_A,
nPLL_BYPASS_B,
IN_SEL_A, IN_SEL_B,
SELB1, SELB0, OEB0,
OEB1, OEA0, OEA1
CLK0, CLK1,
SELA0, SELA1
I
IL
Input
Low Current
nPLL_BYPASS_A,
nPLL_BYPASS_B,
IN_SEL_A, IN_SEL_B,
SELB1, SELB0, OEB0,
OEB1, OEA0, OEA1
Test Conditions
Minimum Typical
2
-0.3
V
CC
= V
IN
= 3.63V
Maximum
V
CC
+ 0.3
0.8
150
Units
V
V
µA
V
CC
= V
IN
= 3.63V
5
µA
V
CC
= 3.63V, V
IN
= 0V
-5
µA
V
CC
= 3.63V, V
IN
= 0V
-150
µA
IDT
™
/ ICS
™
3.3V LVPECL FREQUENCY SYNTHESIZER
3
ICS843204AGI REV. A MARCH 18, 2009
ICS843204I
FEMTOCLOCK™ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
T
ABLE
3C. LVPECL DC C
HARACTERISTICS
,
V
CC
= V
CCO_A
= V
CCO_B
= 3.3V±10%, V
EE
= 0V, T
A
= -40°C
TO
85°C
Symbol
V
OH
V
OL
V
SWING
Parameter
Output High Voltage; NOTE 1
Output Low Voltage; NOTE 1
Peak-to-Peak Output Voltage Swing
Test Conditions
Minimum
V
CCO
- 1.4
V
CCO
- 2.0
0.6
Typical
Maximum
V
CCO
- 0.9
V
CCO
- 1.7
1.0
Units
V
V
V
NOTE 1: Outputs terminated with 50
Ω
to V
CCO
- 2V.
T
ABLE
4. C
RYSTAL
C
HARACTERISTICS
Parameter
Mode of Oscillation
Frequency
Equivalent Series Resistance (ESR)
Shunt Capacitance
NOTE: Characterized using an 18pF parallel resonant crystal.
19.44
Test Conditions
Minimum
Typical
Maximum
25
50
7
Units
MHz
Ω
pF
Fundamental
T
ABLE
5. AC C
HARACTERISTICS
,
V
CC
= V
CCO_A
= V
CCO_B
= 3.3V±10%, V
EE
= 0V, T
A
= -40°C
TO
85°C
Symbol
f
OUT
Parameter
Output Frequency
Bank Skew; NOTE 1, 2
RMS Phase Jitter (Random);
NOTE 3
Output Rise/Fall Time
155.52MHz, (12kHz - 20MHz)
156.25MHz, (1.875MHz - 20MHz)
20% to 80%
250
0.98
0.52
600
Test Conditions
SELB0 = 1; OEB0 = 1
SELA0 = 0; OEA0 = 1
Minimum
Typical
155.52
156.25
50
Maximum
Units
MHz
MHz
ps
ps
ps
ps
t
sk(b)
t
jit(Ø)
t
R
/ t
F
odc
Output Duty Cycle
47
53
%
NOTE: Electrical parameters are guaranteed over the specified ambient operating temperature range, which is established
when the device is mounted in a test socket with maintained transverse airflow greater than 500 lfpm. The device will meet
specifications after thermal equilibrium has been reached under these conditions.
NOTE 1: Defined as skew within a bank of outputs at the same supply voltage and with equal load conditions.
NOTE 2: This parameter is defined in accordance with JEDEC Standard 65.
NOTE 3: See Phase Noise plot.
IDT
™
/ ICS
™
3.3V LVPECL FREQUENCY SYNTHESIZER
4
ICS843204AGI REV. A MARCH 18, 2009
ICS843204I
FEMTOCLOCK™ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
T
YPICAL
P
HASE
N
OISE AT
155.52MH
Z
➤
SONET Jitter Filter
155.52MHz
RMS Phase Jitter (Random)
12kHz to 20MHz = 0.98ps (typical)
N
OISE
P
OWER
dBc
Hz
Raw Phase Noise Data
➤
Phase Noise Result by adding a
SONET Filter to raw data
RMS Phase Jitter (Random)
1.875MHz to 20MHz = 0.52ps (typical)
➤
Gigabit Ethernet Jitter Filter
N
OISE
P
OWER
dBc
Hz
➤
Phase Noise Result by adding a
Gigabit Ethernet Filter to raw data
O
FFSET
F
REQUENCY
(H
Z
)
IDT
™
/ ICS
™
3.3V LVPECL FREQUENCY SYNTHESIZER
5
➤
O
FFSET
F
REQUENCY
(H
Z
)
T
YPICAL
P
HASE
N
OISE AT
156.25MH
Z
156.25MHz
Raw Phase Noise Data
➤
ICS843204AGI REV. A MARCH 18, 2009
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