ICS556M-04IT [ICSI]
LOW SKEW 1 TO 4 CLOCK BUFFER; 低偏移1至4时钟缓冲器
| 型号： | ICS556M-04IT |
| 厂家： | 
INTEGRATED CIRCUIT SOLUTION INC |
| 描述： | LOW SKEW 1 TO 4 CLOCK BUFFER |
| 文件： | 总6页 (文件大小：143K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ICS556-04
LOW SKEW 1 TO 4 CLOCK BUFFER
Description
Features
The ICS556-04 is a low-skew, crystal input compatible
clock buffer with oscillator. This device offers the lowest
skew.
• Extremely low-skew outputs (50 ps maximum)
• Packaged in 8-pin SOIC
• Operating voltages of 2.5 to 5.0 V
• Low-power CMOS technology
• Industrial temperature range
See the ICS552-02 for a 1-to-8 low skew buffer. For
more than eight outputs see the MK74CBxxx Buffalo
TM
series of clock drivers.
• Available in Pb (lead) free package
ICS makes many non-PLL and PLL-based low-skew
output devices. Contact ICS for all of your clocking
needs.
Block Diagram
Q0
Q1
Q2
Q3
5 to 27 MHz
Crystal or clock
X1/ICLK
Crystal
Oscillator/
Buffer
X2
Optional crystal
capacitors
MDS 556-04 C
1
Revision 030905
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS556-04
LOW SKEW 1 TO 4 CLOCK BUFFER
Pin Assignment
1
2
3
4
8
7
6
5
VDD
X1/ICLK
X2
Q4
Q3
Q2
Q1
GND
8-pi n (150 mi l ) SOIC
Pin Descriptions
Pin
Number
Pin
Name
Pin
Type
Pin Description
1
2
3
4
5
6
7
8
VDD
X1/ICLK
X2
Power Connect to +2.5 V, +3.3 V or +5.0 V.
Input Crystal or clock input (5 V tolerant input). Connect to 5 to 27 MHz input.
Input Connect to a fundamental mode crystal. Leave open for clock input.
Power Connect to ground.
GND
Q1
Output Clock Output 1.
Q2
Output Clock Output 2.
Q3
Output Clock Output 3.
Q4
Output Clock Output 3.
External Components
A minimum number of external components are required for proper operation. A decoupling capacitor of 0.01 µF
should be connected between VDD on pin 1 and GND on pin 4, as close to the device as possible. A 33Ω series
terminating resistor may be used on each clock output if the trace is longer than 1 inch.
To achieve the low output skew that the ICS556-04 is capable of, careful attention must be paid to board layout.
Essentially, all four outputs must have identical terminations, identical loads, and identical trace geometries. If not,
the output skew will be degraded. For example, using a 30Ω series termination on one output (with 33Ω on the
others) will cause at least 15 ps of skew.
Crystal Information
The crystal used should be a fundamental mode (do not use third overtone), parallel resonant. Crystal capacitors
should be connected from pins X1 to ground and X2 to ground to optimize the initial accuracy. The value of these
capacitors is given by the following equation:
Crystal caps (pF) = (CL - 6) x 2
In the equation, CL is the crystal load capacitance. So, for a crystal with a 16 pF load capacitance, two 20 pF [(16-6)
x 2] capacitors should be used.
MDS 556-04 C
2
Revision 030905
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS556-04
LOW SKEW 1 TO 4 CLOCK BUFFER
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS556-04. These ratings,
which are standard values for ICS commercially rated parts, are stress ratings only. Functional operation of
the device at these or any other conditions above those indicated in the operational sections of the
specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can
affect product reliability. Electrical parameters are guaranteed only over the recommended operating
temperature range.
Item
Rating
Supply Voltage, VDD
7 V
Output Enable and All Outputs
ICLK
-0.5 V to VDD+0.5 V
-0.5 V to 5.5 V
-40 to +85 °C
-65 to +150°C
125°C
Ambient Operating Temperature
Storage Temperature
Junction Temperature
Soldering Temperature
260°C
Recommended Operation Conditions
Parameter
Min.
Typ.
Max.
+85
Units
°C
Ambient Operating Temperature
Power Supply Voltage (measured in respect to GND)
-40
+2.375
+5.25
V
DC Electrical Characteristics
VDD=2.5 V 5%, Ambient temperature -40 to +85 °C, unless stated otherwise
Parameter
Symbol
Conditions
Min.
2.375
2.0
Typ.
Max.
Units
Operating Voltage
VDD
2.625
V
V
Input High Voltage
V
IH
Input Low Voltage
V
0.8
V
IL
Output High Voltage
Output Low Voltage
Operating Supply Current
Nominal Output Impedance
Short Circuit Current
V
I
I
= -12 mA
= 12 mA
2
V
OH
OH
V
0.4
V
OL
OL
IDD
No load, 27MHz
25
20
28
mA
Ω
Z
O
I
mA
OS
MDS 556-04 C
3
Revision 030905
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS556-04
LOW SKEW 1 TO 4 CLOCK BUFFER
DC Electrical Characteristics (continued)
VDD=3.3 V 5% , Ambient temperature -40 to +85 °C, unless stated otherwise
Parameter
Symbol
Conditions
Min.
3.15
2.0
Typ.
Max.
Units
Operating Voltage
VDD
3.45
V
V
V
V
V
V
Input High Voltage
Input Low Voltage
Output High Voltage
Output Low Voltage
V
IH
V
0.8
0.4
IL
V
I
I
I
= -25 mA
= 25 mA
= -12 mA
2.4
OH
OH
OL
OH
V
OL
Output High Voltage (CMOS
Level)
V
VDD-0.4
OH
Operating Supply Current
Nominal Output Impedance
Short Circuit Current
IDD
No load, 27 MHz
35
20
50
mA
Ω
Z
O
I
mA
OS
VDD=5 V 5% , Ambient temperature -40 to +85 °C, unless stated otherwise
Parameter
Symbol
Conditions
Min.
4.75
2.0
Typ.
Max.
Units
Operating Voltage
VDD
5.25
V
V
V
V
V
V
Input High Voltage
Input Low Voltage
Output High Voltage
Output Low Voltage
V
IH
V
0.8
0.4
IL
V
I
I
I
= -35 mA
= 35 mA
= -12 mA
2.4
OH
OH
OL
OH
V
OL
Output High Voltage (CMOS
Level)
V
VDD-0.4
OH
Operating Supply Current
Nominal Output Impedance
Short Circuit Current
Notes:
IDD
No load, 27 MHz
45
20
80
mA
Ω
Z
O
I
mA
OS
1. Nominal switching threshold is VDD/2
MDS 556-04 C
4
Revision 030905
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS556-04
LOW SKEW 1 TO 4 CLOCK BUFFER
AC Electrical Characteristics
VDD = 2.5 V 5%, Ambient Temperature -40 to +85 °C, unless stated otherwise
Parameter
Symbol
Conditions
Min.
Typ. Max. Units
Input Frequency
5
27
2.5
2.5
50
MHz
ns
Output Rise Time
Output Fall Time
Output to output skew
Duty Cycle
t
0.8 to 2.0 V, C =15 pF
1.8
1.8
0
OR
L
t
2.0 to 0.8 V, C =15 pF
ns
OF
L
Note 1
Rising edges at VDD/2
Measured at VDD/2
ps
45
50
55
%
VDD = 3.3 V 5%, Ambient Temperature -40 to +85 °C, unless stated otherwise
Parameter
Symbol
Conditions
Min.
Typ. Max. Units
Input Frequency
5
27
1.0
1.0
50
MHz
ns
Output Rise Time
Output Fall Time
Output to output skew
Duty Cycle
t
0.8 to 2.0 V, C =15 pF
0.6
0.6
0
OR
L
t
2.0 to 0.8 V, C =15 pF
ns
OF
L
Note 1
Rising edges at VDD/2
Measured at VDD/2
ps
45
50
55
%
Phase Noise at 1MHz from
carrier
-125
dBc/Hz
Clock Jitter RMS 1KHz to 1MHz
6
ps
VDD = 5 V 5%, Ambient Temperature -40 to +85 °C, unless stated otherwise
Parameter
Symbol
Conditions
Min.
Typ. Max. Units
Input Frequency
5
27
0.7
0.7
50
MHz
ns
Output Rise Time
Output Fall Time
Output to output skew
Duty Cycle
t
0.8 to 2.0 V, C =15 pF
0.3
0.3
0
OR
L
t
2.0 to 0.8 V, C =15 pF
ns
OF
L
Note 1
Rising edges at VDD/2
Measured at VDD/2
ps
45
50
55
%
Notes: 1. Between any two outputs with equal loading.
Thermal Characteristics
Parameter
Symbol
Conditions
Min.
Typ. Max. Units
Thermal Resistance Junction to
Ambient
θ
θ
θ
θ
Still air
150
140
120
40
°C/W
°C/W
°C/W
°C/W
JA
JA
JA
JC
1 m/s air flow
3 m/s air flow
Thermal Resistance Junction to Case
MDS 556-04 C
5
Revision 030905
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS556-04
LOW SKEW 1 TO 4 CLOCK BUFFER
Package Outline and Package Dimensions (8-pin SOIC, 150 Mil. Narrow Body)
Package dimensions are kept current with JEDEC Publication No. 95
Millimeters
Inches
8
Symbol
Min
Max
1.75
0.25
0.51
0.25
5.00
4.00
Min
Max
A
A1
B
C
D
E
e
1.35
0.10
0.33
0.19
4.80
3.80
.0532
.0040
.013
.0688
.0098
.020
E
H
.0075
.1890
.1497
.0098
.1968
.1574
INDEX
AREA
1.27 BASIC
0.050 BASIC
1
2
H
h
5.80
6.20
0.50
1.27
8°
.2284
.010
.016
0°
.2440
.020
.050
8°
0.25
0.40
0°
D
L
α
A
h x 45
A1
C
- C -
e
SEATING
PLANE
B
L
.10 (.004)
C
Ordering Information
Part / Order Number
ICS556M-04I
Marking
556M-04I
556M-04I
556M04IL
556M04IL
Shipping Packaging
Tubes
Package
Temperature
-40 to +85°C
-40 to +85°C
-40 to +85°C
-40 to +85°C
8-pin SOIC
8-pin SOIC
8-pin SOIC
8-pin SOIC
ICS556M-04IT
Tape and Reel
Tubes
Tape and Reel
ICS556M-04ILF
ICS556M-04ILFT
“LF” denotes Pb free package.
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems (ICS)
result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal commercial
applications. Any other applications such as those requiring extended temperature range, 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.
MDS 556-04 C
6
Revision 030905
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
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