85357AG-11
www.icst.com/products/hiperclocks.html
REV. B JANUARY 16, 2003
1
Integrated
Circuit
Systems, Inc.
ICS85357-11
4:1
OR
2:1, C
RYSTAL
O
SCILLATOR
-
TO
-3.3V
LVPECL / ECL M
ULTIPLEXER
G
ENERAL
D
ESCRIPTION
The ICS85357-11 is a 4:1 or 2:1, Crystal
Oscillator-to-3.3V LVPECL / ECL Multiplexer and
is a member of the HiPerClockSTM family of High
Performance Clock Solutions from ICS. The
ICS85357-11 has 4 selectable crystal inputs. The
device can support 10MHz to 25MHz parallel resonant crys-
tals by connecting external capacitors between XTALIN/
XTALOUT and ground. The select pins have internal pulldown
resistors and leaving one input unconnected (pulled to logic low
by the internal resistor) will transform the device into a 2:1 mul-
tiplexer. The SEL1 lead is the most significant line and the bi-
nary number applied to the select pins will select the same num-
bered data input (i.e., 00 selects XTALIN0/XTALOUT0).
F
EATURES
1 differential 3.3V LVPECL output
4:1 or 2:1 Crystal Oscillator Multiplexer
Supports parallel resonant crystals with a frequency range
of 10MHz to 25MHz. The oscillator circuit is optimized for
parallel resonant mode, and will require external capacitance
Maximum output frequency: 25MHz
LVCMOS/LVTTL SEL0 and SEL1 inputs have
internal pulldown resistors
LVPECL mode operating voltage supply range:
V
CC
= 3.135V to 3.465V, V
EE
= 0V
ECL mode operating voltage supply range:
V
CC
= 0V, V
EE
= -3.135V to -3.465V
0C to 70C ambient operating temperature
Industrial temperature information available upon request
B
LOCK
D
IAGRAM
P
IN
A
SSIGNMENT
HiPerClockSTM
,&6
V
CC
XTALIN0
XTALOUT0
XTALIN1
XTALOUT1
XTALIN2
XTALOUT2
XTALIN3
XTALOUT3
V
EE
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CC
SEL1
SEL0
V
CC
Q0
nQ0
V
CC
nc
nc
V
EE
ICS85357-11
20-Lead TSSOP
4.40mm x 6.50mm x 0.92mm body package
G Package
Top View
OSC
OSC
Q0
nQ0
OSC
OSC
00
11
01
10
SEL0
SEL1
XTALIN0
XTALOUT0
XTALIN1
XTALOUT1
XTALIN2
XTALOUT2
XTALIN3
XTALOUT3
85357AG-11
www.icst.com/products/hiperclocks.html
REV. B JANUARY 16, 2003
3
Integrated
Circuit
Systems, Inc.
ICS85357-11
4:1
OR
2:1, C
RYSTAL
O
SCILLATOR
-
TO
-3.3V
LVPECL / ECL M
ULTIPLEXER
T
ABLE
4A. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
CC
= 3.3V5%, T
A
= 0C
TO
70C
T
ABLE
4B. LVCMOS / LVTTL DC C
HARACTERISTICS
,
V
CC
= 3.3V5%, T
A
= 0C
TO
70C
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3
=
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0
=
5
-
A
T
ABLE
4C. LVPECL DC C
HARACTERISTICS
,
V
CC
= 3.3V5%, T
A
=0C
TO
70C
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C
.
V
2
-
A
BSOLUTE
M
AXIMUM
R
ATINGS
Supply Voltage, V
CC
4.6V
Inputs, V
I
-0.5V to V
CC
+ 0.5 V
Outputs, V
O
-0.5V to V
CC
+ 0.5V
Package Thermal Impedance,
JA
73.2C/W (0 lfpm)
Storage Temperature, T
STG
-65C to 150C
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 be-
yond those listed in the
DC Characteristics or AC Character-
istics is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect product reliability.
T
ABLE
6. AC C
HARACTERISTICS
,
V
CC
= 3.3V5%, T
A
=0C
TO
70C
T
ABLE
5. C
RYSTAL
C
HARACTERISTICS
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85357AG-11
www.icst.com/products/hiperclocks.html
REV. B JANUARY 16, 2003
6
Integrated
Circuit
Systems, Inc.
ICS85357-11
4:1
OR
2:1, C
RYSTAL
O
SCILLATOR
-
TO
-3.3V
LVPECL / ECL M
ULTIPLEXER
A
PPLICATION
I
NFORMATION
Figure 1. Crystal Input Interface
XTAL_IN
XTAL_OUT
X1
18pF Parallel Crystal
C1
22p
C2
27p
C
RYSTAL
I
NPUT
I
NTERFACE
A crystal can be characterized for either series or parallel mode operation. The ICS85357-11 has a built-in crystal oscillator circuit.
This interface can accept either a series or parallel crystal without additional components and generate frequencies with accuracy
suitable for most applications. Additional accuracy can be achieved by adding two small capacitors C1 and C2 as shown in
Figure 1.
Typical results using parallel 18pF crystals are shown in Table 7.
Table 7. T
YPICAL
R
ESULTS
OF
C
RYSTAL
I
NPUT
I
NTERFACE
F
REQUENCY
F
INE
T
UNING
Crystal Frequency
C1
C2
Measured Output Frequency
Accuracy
Duty Cycle
(MHz)
(pF)
(pF)
(MHz)
(PPM)
(%)
14.31818
22
27
14.318011
-12
47.46
15.00
22
27
14.999862
-9
47.70
16.66
22
27
16.660162
10
47.70
19.44
22
27
19.440081
4
46.85
24.00
22
27
24.000183
8
46.00
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