2:1, DIFFERENTIAL-
TO-LVPECL MULTIPLEXER
ICS85301
G
ENERAL
D
ESCRIPTION
The ICS85301 is a high performance 2:1 Differen-
tial-to-LVPECL Multiplexer and a member of the
IC
S
HiPerClockS™
HiPerClockS™ family of High Performance Clock
Solutions from IDT. The ICS85301 can also per-
form differential translation because the differen-
tial inputs accept LVPECL, CML as well as LVDS levels. The
ICS85301 is packaged in a small 3mm x 3mm 16 VFQFN
package, making it ideal for use on space constrained boards.
F
EATURES
•
2:1 LVPECL MUX
•
One LVPECL output
•
Two differential clock inputs can accept: LVPECL, LVDS, CML
•
Maximum input/output frequency: 3GHz
•
Translates LVCMOS/LVTTL input signals to LVPECL levels by
using a resistor bias network on nPCLK0, nPCLK0
•
Propagation delay: 490ps (maximum)
•
Part-to-part skew: 150ps (maximum)
•
Additive phase jitter, RMS: 0.009ps (typical)
•
Full 3.3V or 2.5V operating supply
•
-40°C to 85°C ambient operating temperature
•
Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
B
LOCK
D
IAGRAM
PCLK0
nPCLK0
PCLK1
nPCLK1
0
Q
nQ
1
P
IN
A
SSIGNMENT
PCLK0 1
nPCLK0 2
PCLK1 3
nPCLK1 4
5
V
BB
16 15 14 13
12
11
10
9
6
CLK_SEL
V
CC
V
EE
V
EE
nc
V
EE
Q
nQ
V
EE
7
nc
8
V
CC
CLK_SEL
V
BB
ICS85301
16-Lead VFQFN
3mm x 3mm x 0.95 package body
K Package
Top View
PCLK0
nPCLK0
PCLK1
nPCLK1
V
BB
CLK_SEL
nc
V
CC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
nc
V
EE
V
EE
V
CC
V
EE
Q
nQ
V
EE
ICS85301
16-Lead TSSOP
4.4mm x 5.0mm x 0.92mm
package body
G Package
Top View
IDT
™
/ ICS
™
2:1, LVPECL MULTIPLEXER
1
ICS85301 REV. B DECEMBER 22, 2006
ICS85301
2:1, DIFFERENTIAL-TO-LVPECL MULTIPLEXER
T
ABLE
1. P
IN
D
ESCRIPTIONS
Number
1
2
3
4
5
7, 16
6
8, 13
9, 12, 14, 15
10, 11
Name
PCLK0
nPCLK0
PCLK1
nPCLK1
V
BB
nc
CLK_SEL
V
CC
V
EE
nQ, Q
Input
Input
Input
Input
Output
Unused
Input
Power
Power
Output
Pulldown
Type
Pulldown
Pullup/
Pulldown
Pulldown
Pullup/
Pulldown
Description
Non-inver ting differential LVPECL clock input.
Inver ting differential LVPECL clock input. V
CC
/2 default when left floating.
Non-inver ting differential LVPECL clock input.
Inver ting differential LVPECL clock input. V
CC
/2 default when left floating.
Bias voltage.
No connect.
Clock select input. When HIGH, selects PCLK1, nPCLK1 inputs.
When LOW, selects PCLK0, nPCLK0 inputs.
LVCMOS / LVTTL interface levels.
Positive supply pins.
Negative supply pins.
Differential output pair. LVPECL 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
PULLUP
R
PULLDOWN
Parameter
Input Capacitance
Input Pullup Resistor
Input Pulldown Resistor
Test Conditions
Minimum
Typical
1
37
37
Maximum
Units
pF
kΩ
kΩ
T
ABLE
3. C
ONTROL
I
NPUT
F
UNCTION
T
ABLE
Input
CLK_SEL
0
1
Input Selected
PCLK
PCLK0, nPCLK0
PCLK1, nPCLK1
IDT
™
/ ICS
™
2:1, LVPECL MULTIPLEXER
2
ICS85301 REV. B DECEMBER 22, 2006
ICS85301
2:1, DIFFERENTIAL-TO-LVPECL MULTIPLEXER
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
+ 0.5 V
50mA
100mA
NOTE: Stresses beyond those listed under Absolute
Maximum Ratings may cause permanent 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
16 VFQFN
51.5°C/W (0 lfpm)
16 TSSOP
89°C/W (0 lfpm)
Storage Temperature, T
STG
-65°C to 150°C
T
ABLE
4A. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
CC
= 3.3V ± 5%, T
A
= -40°C
TO
85°C
Symbol
V
CC
I
EE
Parameter
Positive Supply Voltage
Power Supply Current
Test Conditions
Minimum
3.135
Typical
3.3
Maximum
3.465
26
Units
V
mA
T
ABLE
4B. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
CC
= 2.5V ± 5%, T
A
= -40°C
TO
85°C
Symbol
V
CC
I
EE
Parameter
Positive Supply Voltage
Power Supply Current
Test Conditions
Minimum
2.375
Typical
2.5
Maximum
2.625
24
Units
V
mA
T
ABLE
4C. LVCMOS / LVTTL DC C
HARACTERISTICS
,
V
CC
= 3.3V ± 5%
OR
2.5V ± 5%, T
A
= -40°C
TO
85°C
Symbol
V
IH
V
IL
I
IH
I
IL
Parameter
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
CLK_SEL
CLK_SEL
CLK_SEL
CLK_SEL
V
CC
= V
IN
= 3.465V or 2.625V
V
CC
= 3.465V or 2.625V, V
IN
= 0V
-150
Test Conditions
Minimum
2
-0.3
Typical
Maximum
V
CC
+ 0.3
0.8
150
Units
V
V
µA
µA
NOTE: Outputs terminated with 50
Ω
to V
CC
/2. See Parameter Measurement Information, "Output Load Test Circuit".
T
ABLE
4D. LVPECL DC C
HARACTERISTICS
,
V
CC
= 3.3V ± 5%, T
A
= -40°C
TO
85°C
Symbol Parameter
I
IH
I
IL
V
PP
V
CMR
V
OH
V
OL
V
swing
V
BB
Input High Current
Input Low Current
PCLK0, nPCLK0,
PCLK1, nPCLK1
PCLK0, PCLK1
nPCLK0, nPCLK1
Test Conditions
V
CC
= V
IN
= 3.465
V
CC
= 3.465V, V
IN
= 0V
V
CC
= 3.465V, V
IN
= 0V
-10
-150
150
1.2
V
CC
- 1.125
V
CC
- 1.895
0.495
1.695
1200
3.3
V
CC
- 0.93
V
CC
- 1.62
0.975
2.145
Minimum
Typical
Maximum
150
Units
µA
µA
µA
mV
V
V
V
V
V
Peak-to-Peak Input Voltage
Common Mode Input Voltage; NOTE 1, 2
Output High Voltage; NOTE 3
Output Low Voltage; NOTE 3
Peak-to-Peak Output Voltage Swing
Bias Voltage
NOTE 1: Common mode voltage is defined as V
IH
.
NOTE 2: For single ended applications
,
the maximum input voltage for PCLKx, nPCLKx is V
CC
+ 0.3V.
NOTE 3: Outputs terminated with 50
Ω
to V
CC
- 2V. .
IDT
™
/ ICS
™
2:1, LVPECL MULTIPLEXER
3
ICS85301 REV. B DECEMBER 22, 2006
ICS85301
2:1, DIFFERENTIAL-TO-LVPECL MULTIPLEXER
T
ABLE
4E. LVPECL DC C
HARACTERISTICS
,
V
CC
= 2.5V ± 5%, T
A
= -40°C
TO
85°C
Symbol Parameter
I
IH
I
IL
V
PP
V
CMR
V
OH
V
OL
V
swing
V
BB
Input High Current
Input Low Current
PCLK0, nPCLK0,
PCLK1, nPCLK1
PCLK0, PCLK1
nPCLK0, nPCLK1
Test Conditions
V
CC
= V
IN
= 2.625V
V
CC
= 2.625V, V
IN
= 0V
V
CC
= 2.625V, V
IN
= 0V
-10
-150
150
1.2
V
CC
- 1.125
V
CC
- 1.895
0.495
0.935
1200
2.5
V
CC
- 0.93
V
CC
- 1.62
0.975
1.305
Minimum
Typical
Maximum
150
Units
µA
µA
µA
mV
V
V
V
V
V
Peak-to-Peak Input Voltage
Common Mode Input Voltage; NOTE 1, 2
Output High Voltage; NOTE 3
Output Low Voltage; NOTE 3
Peak-to-Peak Output Voltage Swing
Bias Voltage
NOTE 1: Common mode voltage is defined as V
IH
.
NOTE 2: For single ended applications
,
the maximum input voltage for PCLKx, nPCLKx is V
CC
+ 0.3V.
NOTE 3: Outputs terminated with 50
Ω
to V
CC
- 2V. .
T
ABLE
5A. AC C
HARACTERISTICS
,
V
CC
= 3.3V±5%, T
A
= -40°C
TO
85°C
Symbol
f
MAX
t
PD
Parameter
Output Frequency
Propagation Delay; NOTE 1
Par t-to-Par t Skew; NOTE 2, 3
Input Skew
Buffer Additive Phase Jitter, RMS;
refer to Additive Phase Jitter section
Output Rise/Fall Time
Output Duty Cycle
MUX Isolation
f = 622MHz
622MHz (Integration Range:
12kHz - 20MHz)
20% to 80%
240
Test Conditions
Minimum
Typical
Maximum
3
490
150
25
0.009
100
48
-55
200
52
Units
GHz
ps
ps
ps
ps
ps
%
dBm
t
sk(pp)
t
sk(i)
t
jit
t
R
/ t
F
odc
MUX_
ISOL
All parameters measured at f
≤
1.7GHz unless otherwise noted.
NOTE 1: Measured from the differential input crossing point to the differential output crossing point.
NOTE 2: Defined as skew between outputs on different devices operating at the same supply voltages and
with equal load conditions. Using the same type of inputs on each device, the outputs are measured
at the differential cross points.
NOTE 3: This parameter is defined in accordance with JEDEC Standard 65.
T
ABLE
5B. AC C
HARACTERISTICS
,
V
CC
= 2.5V±5%, T
A
= -40°C
TO
85°C
Symbol
f
MAX
t
PD
Parameter
Output Frequency
Propagation Delay; NOTE 1
Par t-to-Par t Skew; NOTE 2, 3
Input Skew
Buffer Additive Phase Jitter, RMS;
refer to Additive Phase Jitter section
Output Rise/Fall Time
Output Duty Cycle
MUX Isolation
f = 622MHz
622MHz (Integration Range:
12kHz - 20MHz)
20% to 80%
240
Test Conditions
Minimum
Typical
Maximum
3
490
150
25
0.009
100
47
-55
200
53
Units
GHz
ps
ps
ps
ps
ps
%
dBm
t
sk(pp)
t
sk(i)
t
jit
t
R
/ t
F
odc
MUX_
ISOL
For notes, see Table 5A above.
IDT
™
/ ICS
™
2:1, LVPECL MULTIPLEXER
4
ICS85301 REV. B DECEMBER 22, 2006
ICS85301
2:1, DIFFERENTIAL-TO-LVPECL MULTIPLEXER
A
DDITIVE
P
HASE
J
ITTER
The spectral purity in a band at a specific offset from the
fundamental compared to the power of the fundamental is called
the
dBc Phase Noise.
This value is normally expressed using a
Phase noise plot and is most often the specified plot in many
applications. Phase noise is defined as the ratio of the noise power
present in a 1Hz band at a specified offset from the fundamental
frequency to the power value of the fundamental. This ratio is
expressed in decibels (dBm) or a ratio of the power in the 1Hz
0
-10
-20
-30
-40
-50
band to the power in the fundamental. When the required offset
is specified, the phase noise is called a
dBc
value, which simply
means dBm at a specified offset from the fundamental. By
investigating jitter in the frequency domain, we get a better
understanding of its effects on the desired application over the
entire time record of the signal. It is mathematically possible to
calculate an expected bit error rate given a phase noise plot.
Additive Phase Jitter
3.3V or 2.5V @ 622MHz (12kHz to 20MHz)
= 0.009ps typical
SSB P
HASE
N
OISE
dBc/H
Z
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
1k
10k
100k
1M
10M
100M
O
FFSET
F
ROM
C
ARRIER
F
REQUENCY
(H
Z
)
As with most timing specifications, phase noise measurements
have issues. The primary issue relates to the limitations of the
equipment. Often the noise floor of the equipment is higher than
the noise floor of the device. This is illustrated above. The device
meets the noise floor of what is shown, but can actually be lower.
The phase noise is dependant on the input source and
measurement equipment.
IDT
™
/ ICS
™
2:1, LVPECL MULTIPLEXER
5
ICS85301 REV. B DECEMBER 22, 2006
