2:1 DIFFERENTIAL-TO-LVPECL MULTIPLEXER
ICS858018
General Description
The ICS858018 is a high performance 2:1
Differential-to-LVPECL Multiplexer and is a member
HiPerClockS™
of the HiPerClockS™ family of high performance
clock solutions from IDT. The ICS858018 differential
inputs have internal termination resistors and when
used in conjunction with the V
T0
/V
T1
pins, allow the inputs to
interface with several differential signal types. The ICS858018 is
packaged in a small, 3mm x 3mm VFQFN package, making it
ideal for use on space-constrained boards.
Features
•
•
•
•
•
•
•
•
One LVPECL output
INx/nINx pairs can accept the following differential input levels:
LVPECL, LVDS, CML
Maximum output frequency: 2GHz
Propagation delay: 700ps (maximum)
Part-to-part skew: 250ps (maximum)
Supply voltage range:
(LVPECL) V
CC
= 2.375V to 3.63V, V
EE
= 0V
(ECL) V
CC
= 0V, V
EE
= -3.63V to -2.375V
-40°C to 85°C ambient operating temperature
Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
ICS
Block Diagram
IN0
V
T0
nIN0
IN1
V
T1
nIN1
SEL
1
0
Q
nQ
Pin Assignment
V
EE
V
CC
V
EE
V
T0
IN0 1
nIN0
2
16 15 14 13
12 Q
11 V
EE
10 V
EE
9 nQ
5
V
T1
IN1 3
nIN1 4
6
SEL
7
nc
8
V
CC
ICS858018
16-Lead VFQFN
3mm x 3mm x 0.925
mm package body
G Package
Top View
IDT™ / ICS™
LVPECL MULTIPLEXER
1
ICS858018AK REV. A OCTOBER 3, 2008
ICS858018
2:1 DIFFERENTIAL-TO-LVPECL MULTIPLEXER
Table 1. Pin Descriptions
Number
1
2
3
4
5, 16
6
7
8, 13
9, 12
10, 11, 14, 15
Name
IN0
nIN0
IN1
nIN1
V
T1,
V
T0
SEL
nc
V
CC
nQ, Q
V
EE
Type
Input
Input
Input
Input
Input
Input
Unused
Power
Output
Power
Pullup
Description
Non-inverting differential LVPECL clock input.
Inverting differential LVPECL clock input.
Non-inverting differential LVPECL clock input.
Inverting differential LVPECL clock input.
Input for termination. Both IN and nIN inputs are terminated to this pin. See
Application Information section,
Differential Input with Built-in 50
Ω
Termination
Interface.
Select pin. LVCMOS/LVTTL interface levels.
No connect.
Power supply pins.
Differential output pair. LVPECL/ECL interface levels.
Negative supply pins.
NOTE:
Pullup
refers to internal input resistors. See Table 2,
Pin Characteristics,
for typical values
Table 2. Pin Characteristics
Symbol
R
PULLUP
Parameter
Input Pullup Resistor
Test Conditions
Minimum
Typical
37
Maximum
Units
k
Ω
Table 3. Truth Table
Inputs
IN0
0
1
X
X
nIN0
1
0
X
X
IN1
X
X
0
1
nIN1
X
X
1
0
SEL
0
0
1
1
Q
0
1
0
1
Outputs
nQ
1
0
1
0
IDT™ / ICS™
LVPECL MULTIPLEXER
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ICS858018AK REV. A OCTOBER 3, 2008
ICS858018
2:1 DIFFERENTIAL-TO-LVPECL MULTIPLEXER
Absolute Maximum Ratings
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.
Item
Supply Voltage, V
CC
Inputs, V
I
Outputs, I
O
Continuous Current
Surge Current
Input Current, IN/nIN
V
T
Current, I
VT
Operating Temperature Range, T
A
Storage Temperature, T
STG
Package Thermal Impedance,
θ
JA
(Junction-to-Ambient)
Rating
-0.5V to + 4.0V
-0.5V to V
CC
+ 0.5V
50mA
100mA
+50mA
+100mA
-40°C to 85°C
-65°C to 150°C
88.5°C/W (0 mps)
DC Electrical Characteristics
Table 4A. Power Supply DC Characteristics,
V
CC
= 3.3V±10% or 2.5V±5%, V
EE
= 0V, 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
3.3
Maximum
3.63
21
Units
V
mA
Table 4B. LVCMOS/LVTTL DC Characteristics,
V
CC
= 3.3V±10% or 2.5V±5%, V
EE
= 0V, T
A
= -40°C to 85°C
Symbol
V
IH
Parameter
Input High Voltage
Test Conditions
V
CC
= 3.3V
V
CC
= 2.5V
Input Low Voltage
Input High Current
Input Low Current
V
CC
= 3.3V
V
CC
= 2.5V
V
CC
= V
IN
= 3.63V or 2.625V
V
CC
= 3.63V or 2.625V, V
IN
= 0V
-150
Minimum
2
1.7
-0.3
-0.3
Typical
Maximum
V
CC
+ 0.3
V
CC
+ 0.3
0.8
0.7
10
Units
V
V
V
V
µA
µA
V
IL
I
IH
I
IL
IDT™ / ICS™
LVPECL MULTIPLEXER
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ICS858018AK REV. A OCTOBER 3, 2008
ICS858018
2:1 DIFFERENTIAL-TO-LVPECL MULTIPLEXER
Table 4C. DC Characteristics,
V
CC
= 3.3V±10% or 2.5V±5%, V
EE
= 0V, T
A
= -40°C to 85°C
Symbol
R
IN
V
IH
V
IL
V
IN
V
DIFF_IN
IN
Parameter
Differential Input Resistance
Input High Voltage
Input Low Voltage
Input Voltage Swing
Differential Input Voltage Swing
Input Current; NOTE 1
INx/nINx
INx/nINx
INx/nINx
INx/nINx
Test Conditions
IN to V
T
Minimum
40
1.2
0
0.15
0.3
Typical
50
Maximum
60
V
CC
V
IH
– 0.15
2.8
3.4
35
Units
Ω
V
V
V
V
mA
NOTE 1: Guaranteed by design.
Table 4D. LVPECL DC Characteristics,
V
CC
= 3.3V±10% or 2.5V±5%, V
EE
= 0V, T
A
= -40°C to 85°C
Symbol
V
OH
V
OL
V
OUT
Parameter
Output High Voltage; NOTE 1
Output Low Voltage; NOTE 1
Output Voltage Swing
0.6
1.2
Test Conditions
Minimum
Typical
V
CC
– 1.005
V
CC
– 1.78
1.0
2.0
Maximum
Units
V
V
V
V
V
DIFF_OUT
Differential Output Voltage Swing
NOTE 1: Outputs terminated with 50Ω to V
CC
– 2V.
AC Electrical Characteristics
Table 3. LVPECL AC Characteristics,
V
CC
= 3.3V±10% or 2.5V±5%, V
EE
= 0V, T
A
= -40°C to 85°C
Parameter
f
MAX
t
PD
tsk(i)
tsk(pp)
t
R
/ t
F
Symbol
Output Frequency
Propagation Delay,
Differential; NOTE 1
Input Skew; NOTE 2
Part-to-Part Skew; NOTE 3, 4
Output Rise/Fall Time
20% to 80%
75
IN0 or
IN1-to-Q
SEL-to-Q
Test Conditions
V
OUT
≥
450mV
350
0.175
Minimum
Typical
Maximum
2
700
1.3
35
250
375
Units
GHz
ps
ns
ps
ps
ps
All parameters characterized at
≤
1GHz unless otherwise noted
T
A
, Ambient Temperature applied using forced air flow.
NOTE 1: Measured from the differential input crossing point to the differential output crossing point.
NOTE 2: Defined as skew between inputs measured to the same output at the same supply voltage and with equal load conditions.
Measured at the output differential cross points.
NOTE 3: 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 4: This parameter is defined in accordance with JEDEC Standard 65.
IDT™ / ICS™
LVPECL MULTIPLEXER
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ICS858018AK REV. A OCTOBER 3, 2008
ICS858018
2:1 DIFFERENTIAL-TO-LVPECL MULTIPLEXER
Parameter Measurement Information
2V
V
CC
V
CC
Qx
SCOPE
nINx
V
PP
Cross Points
V
CMR
INx
LVPECL
nQx
V
EE
V
EE
-1.63V to -0.375V
Output Load AC Test Circuit
Differential Input Level
Par t 1
nQx
Qx
nQy
Qy
nINx
INx
Par t 2
nQ
Q
tsk(pp)
t
PD
Part-to-Part Skew
Propagation Delay
nQ
80%
V
DIFF_IN
, V
DIFF_OUT
V
IN
, V
OUT
800mV
(typical)
1600mV
(typical)
Q
80%
V
SW I N G
20%
t
R
t
F
20%
Single-ended & Differential Input Voltage Swing
Output Rise/Fall Time
IDT™ / ICS™
LVPECL MULTIPLEXER
5
ICS858018AK REV. A OCTOBER 3, 2008
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