Document Outline
- General Description
- Features
- Block Diagram
- Pin Assignment
- Pin Descriptions
- Pin Characteristics
- Input Reference Function Table
- Absolute Maximum Ratings
- Power Supply 3.3V DC Characteristics
- Power Supply 3.3V/2.5V DC Characteristics
- Power Supply 3.3V/1.8V DC Characteristics
- Power Supply 2.5V DC Characteristics
- Power Supply 2.5V/1.8V DC Characteristics
- LVCMOS DC Characteristics
- Crystal Characteristics
- 3.3V AC Characteristics
- 3.3V/2.5V AC Characteristics
- 3.3V/1.8V AC Characteristics
- 2.5V AC Characteristics
- 2.5V/1.8V AC Characteristics
- Typical Phase Noise Plot
- Parameter Measurement Information
- Parameter Measurement Information, continued
- Application Information
- Crystal Input Interface
- Recommendations for Unused Input and Output Pins
- Reliability Information
- Transistor Count
- Package Outline
- Package Dimensions
- Ordering Information
Integrated
Circuit
Systems, Inc.
83908AG-02
www.icst.com/products/hiperclocks.html
REV. A JULY 20, 2005
1
ICS83908-02
L
OW
S
KEW
, 1-
TO
-8
C
RYSTAL
-
TO
-LVCMOS/LVTTL F
ANOUT
B
UFFER
PRELIMINARY
G
ENERAL
D
ESCRIPTION
The ICS83908-02 is a low skew, high performance
1-to-8 Crystal Oscillator/3.3V LVCMOS-to-3.3V
LVCMOS fanout buffer and a member of the
HiPerClockSTM family of High Performance Clock
Solutions from ICS. The ICS83908-02 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.
Guaranteed output and part-to-part skew characteristics
make the ICS83908-02 ideal for those applications demanding
well defined performance and repeatability.
HiPerClockSTM
ICS
B
LOCK
D
IAGRAM
P
IN
A
SSIGNMENT
F
EATURES
8 LVCMOS/LVTTL outputs (19
typical output impedance)
2 Crystal oscillator input pairs
1 LVCMOS/LVTTL clock input
Crystal input frequencry range: 10MHz - 40MHz
Output frequency: 200MHz (typical) CLK0
Output Skew: TBD
Part to Part Skew: TBD
RMS phase jitter @ 25MHz (100Hz - 1MHz):
0.22ps (typical) V
DD
= V
DDO
= 3.3V
Offset
Noise Power
100Hz .............. -111.4 dBc/Hz
1kHz .............. -139.9 dBc/Hz
10kHz .............. -157.3 dBc/Hz
100kHz .............. -157.5 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
Industrial temperature available upon request
OE
CLK_SEL0
CLK_SEL1
CLK0
Q0
Q7
OSC
OSC
0 0
0 1
1 0
1 1
Pullup
ICS83908-02
24-Lead, 173-MIL TSSOP
4.4mm x 7.8mm x 0.92mm
body package
G Package
Top View
V
DD
XTAL_IN0
XTAL_OUT0
V
DDO
Q0
Q1
GND
Q2
Q3
V
DDO
CLK_SEL0
CLK0
GND
XTAL_IN1
XTAL_OUT1
V
DDO
Q7
Q6
GND
Q5
Q4
V
DDO
CLK_SEL1
OE
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
Pulldown
Pulldown
XTAL_IN0
XTAL_OUT0
XTAL_IN1
XTAL_OUT1
Pulldown
8 LVCMOS Outputs
The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on initial
product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice.
Integrated
Circuit
Systems, Inc.
83908AG-02
www.icst.com/products/hiperclocks.html
REV. A JULY 20, 2005
2
ICS83908-02
L
OW
S
KEW
, 1-
TO
-8
C
RYSTAL
-
TO
-LVCMOS/LVTTL F
ANOUT
B
UFFER
PRELIMINARY
T
ABLE
1. P
IN
D
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Integrated
Circuit
Systems, Inc.
83908AG-02
www.icst.com/products/hiperclocks.html
REV. A JULY 20, 2005
3
ICS83908-02
L
OW
S
KEW
, 1-
TO
-8
C
RYSTAL
-
TO
-LVCMOS/LVTTL F
ANOUT
B
UFFER
PRELIMINARY
A
BSOLUTE
M
AXIMUM
R
ATINGS
Supply Voltage, V
DD
4.6V
Inputs, V
I
-0.5V to V
DD
+ 0.5 V
Outputs, V
O
-0.5V to V
DDO
+ 0.5V
Package Thermal Impedance,
JA
70C/W (0 mps)
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
4A. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
DD
= V
DDO
= 3.3V5%, T
A
= 0C
TO
70C
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S
UPPLY
DC C
HARACTERISTICS
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DD
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DDO
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A
= 0C
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4B. P
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S
UPPLY
DC C
HARACTERISTICS
,
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DD
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DDO
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A
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TO
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4C. P
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S
UPPLY
DC C
HARACTERISTICS
,
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DD
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DDO
= 1.8V0.2V, T
A
= 0C
TO
70C
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4E. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
DD
= 2.5V5%, V
DDO
= 1.8V0.2V, T
A
= 0C
TO
70C
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1
5
A
m
Integrated
Circuit
Systems, Inc.
83908AG-02
www.icst.com/products/hiperclocks.html
REV. A JULY 20, 2005
4
ICS83908-02
L
OW
S
KEW
, 1-
TO
-8
C
RYSTAL
-
TO
-LVCMOS/LVTTL F
ANOUT
B
UFFER
PRELIMINARY
T
ABLE
4F. LVCMOS/LVTTL DC C
HARACTERISTICS
,
T
A
= -40C
TO
85C
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V
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%
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3
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2
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0
+
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5
V
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2
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1
W
m
Integrated
Circuit
Systems, Inc.
83908AG-02
www.icst.com/products/hiperclocks.html
REV. A JULY 20, 2005
5
ICS83908-02
L
OW
S
KEW
, 1-
TO
-8
C
RYSTAL
-
TO
-LVCMOS/LVTTL F
ANOUT
B
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PRELIMINARY
T
ABLE
6A. AC C
HARACTERISTICS
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V
DD
= V
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= 3.3V 5%, T
A
= 0C
TO
70C
T
ABLE
6B. AC C
HARACTERISTICS
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DD
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DDO
= 2.5V 5%, T
A
= 0C
TO
70C
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N
Integrated
Circuit
Systems, Inc.
83908AG-02
www.icst.com/products/hiperclocks.html
REV. A JULY 20, 2005
6
ICS83908-02
L
OW
S
KEW
, 1-
TO
-8
C
RYSTAL
-
TO
-LVCMOS/LVTTL F
ANOUT
B
UFFER
PRELIMINARY
T
ABLE
6D. AC C
HARACTERISTICS
,
V
DD
= V
DDO
= 2.5V 5%, T
A
= 0C
TO
70C
T
ABLE
6C. AC C
HARACTERISTICS
,
V
DD
= 3.3V 5%, V
DDO
= 1.8V0.2V, T
A
= 0C
TO
70C
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Integrated
Circuit
Systems, Inc.
83908AG-02
www.icst.com/products/hiperclocks.html
REV. A JULY 20, 2005
7
ICS83908-02
L
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S
KEW
, 1-
TO
-8
C
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-
TO
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ANOUT
B
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PRELIMINARY
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Integrated
Circuit
Systems, Inc.
83908AG-02
www.icst.com/products/hiperclocks.html
REV. A JULY 20, 2005
8
ICS83908-02
L
OW
S
KEW
, 1-
TO
-8
C
RYSTAL
-
TO
-LVCMOS/LVTTL F
ANOUT
B
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PRELIMINARY
25MHz
RMS Phase Jitter (Random)
100Hz to 1MHz = 0.22ps (typical)
O
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F
REQUENCY
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Z
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OISE
P
O
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Hz
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
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-110
-120
-130
-140
-150
-160
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100
1k
10k
100k
1M
T
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P
HASE
N
OISE
AT
25MH
Z
@ 3.3V
Raw Phase Noise Data
Integrated
Circuit
Systems, Inc.
83908AG-02
www.icst.com/products/hiperclocks.html
REV. A JULY 20, 2005
9
ICS83908-02
L
OW
S
KEW
, 1-
TO
-8
C
RYSTAL
-
TO
-LVCMOS/LVTTL F
ANOUT
B
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PRELIMINARY
P
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M
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I
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SCOPE
Qx
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UTPUT
L
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C
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2.4V0.065V
V
DDO
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V
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LVCMOS
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UTPUT
L
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EST
C
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DDO
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L
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C
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SCOPE
Qx
LVCMOS
1.6V0.025V
V
DDO
-0.9V0.1V
V
DD
0.9V0.1V
V
DD
,
V
DDO
GND
V
DD
,
V
DDO
GND
GND
GND
GND
tsk(pp)
V
DDO
2
V
DDO
2
Qy
Qx
Part 1
Part 2
Integrated
Circuit
Systems, Inc.
83908AG-02
www.icst.com/products/hiperclocks.html
REV. A JULY 20, 2005
10
ICS83908-02
L
OW
S
KEW
, 1-
TO
-8
C
RYSTAL
-
TO
-LVCMOS/LVTTL F
ANOUT
B
UFFER
PRELIMINARY
Clock
Outputs
20%
80%
80%
20%
t
R
t
F
t
PERIOD
t
PW
t
PERIOD
odc =
V
DDO
2
x 100%
t
PW
Q0:Q7
tp
LH
V
DDO
2
V
DD
2
CLK0
Q0:Q7
O
UTPUT
R
ISE
/F
ALL
T
IME
P
ROPAGATION
D
ELAY
O
UTPUT
D
UTY
C
YCLE
/P
ULSE
W
IDTH
/P
ERIOD
Integrated
Circuit
Systems, Inc.
83908AG-02
www.icst.com/products/hiperclocks.html
REV. A JULY 20, 2005
11
ICS83908-02
L
OW
S
KEW
, 1-
TO
-8
C
RYSTAL
-
TO
-LVCMOS/LVTTL F
ANOUT
B
UFFER
PRELIMINARY
Figure 1. Crystal Input Interface
C
RYSTAL
I
NPUT
I
NTERFACE
A crystal can be characterized for either series or parallel mode
operation. The ICS83908-02 has a built-in crystal oscillator
circuit. This interface can accept either a series or parallel
crystal without additional components and generate fre-
quencies 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 5.
A
PPLICATION
I
NFORMATION
I
NPUTS
:
C
RYSTAL
I
NPUT
:
For applications not requiring the use of the crystal oscillator
input, both XTAL_IN and XTAL_OUT can be left floating. Though
not required, but for additional protection, a 1k
resister can be
tied from XTAL_IN to ground.
CLK I
NPUT
:
For applications not requiring the use of the test clock, it can be
left floating. Though not required, but for additional protection, a
1k
resister can be tied from the CLK input to ground.
S
ELECT
P
INS
:
All select pins have internal pull-ups and pull-downs; additional
resistance is not required but can be added for additional
protection. A 1k
resister can be used.
R
ECOMMENDATIONS
FOR
U
NUSED
I
NPUT
AND
O
UTPUT
P
INS
O
UTPUTS
:
LVCMOS O
UTPUT
:
All unused LVCMOS output can be left floating. We recommend
that there is no trace attached.
C1
15p
X1
18pF Parallel Crystal
C2
15p
XTAL_OUT
XTAL_IN
Integrated
Circuit
Systems, Inc.
83908AG-02
www.icst.com/products/hiperclocks.html
REV. A JULY 20, 2005
12
ICS83908-02
L
OW
S
KEW
, 1-
TO
-8
C
RYSTAL
-
TO
-LVCMOS/LVTTL F
ANOUT
B
UFFER
PRELIMINARY
R
ELIABILITY
I
NFORMATION
T
RANSISTOR
C
OUNT
The transistor count for ICS83908-02 is: 277
T
ABLE
7.
JA
VS
. A
IR
F
LOW
T
ABLE
FOR
24 L
EAD
TSSOP
JA
by Velocity (Meters per Second)
0
1
2.5
Multi-Layer PCB, JEDEC Standard Test Boards
70C/W
65C/W
62C/W
Integrated
Circuit
Systems, Inc.
83908AG-02
www.icst.com/products/hiperclocks.html
REV. A JULY 20, 2005
13
ICS83908-02
L
OW
S
KEW
, 1-
TO
-8
C
RYSTAL
-
TO
-LVCMOS/LVTTL F
ANOUT
B
UFFER
PRELIMINARY
P
ACKAGE
O
UTLINE
- G S
UFFIX
FOR
24 L
EAD
TSSOP
T
ABLE
8. P
ACKAGE
D
IMENSIONS
R
EFERENCE
D
OCUMENT
: JEDEC P
UBLICATION
95, MO-153
L
O
B
M
Y
S
s
r
e
t
e
m
i
l
l
i
M
m
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m
i
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i
M
m
u
m
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x
a
M
N
4
2
A
-
-
0
2
.
1
1
A
5
0
.
0
5
1
.
0
2
A
0
8
.
0
5
0
.
1
b
9
1
.
0
0
3
.
0
c
9
0
.
0
0
2
.
0
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0
7
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9
.
7
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C
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A
B
0
4
.
6
1
E
0
3
.
4
0
5
.
4
e
C
I
S
A
B
5
6
.
0
L
5
4
.
0
5
7
.
0
0
8
a
a
a
-
-
0
1
.
0
Integrated
Circuit
Systems, Inc.
83908AG-02
www.icst.com/products/hiperclocks.html
REV. A JULY 20, 2005
14
ICS83908-02
L
OW
S
KEW
, 1-
TO
-8
C
RYSTAL
-
TO
-LVCMOS/LVTTL F
ANOUT
B
UFFER
PRELIMINARY
T
ABLE
9. O
RDERING
I
NFORMATION
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems, Incorporated (ICS) assumes no responsibility for either its use
or for infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use
in normal commercial and industrial applications. Any other applications such as those requiring high reliability or other extraordinary environmental requirements are not
recommended without additional processing by ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does not authorize or warrant any ICS product
for use in life support devices or critical medical instruments.
The aforementioned trademark, HiPerClockSTM is a trademark of Integrated Circuit Systems, Inc. or its subsidiaries in the United States and/or other countries.
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