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DATASHEET
LOW SKEW 1 TO 4 CLOCK BUFFER Description
The ICS524 is a low skew, single input to four output, clock buffer. Part of ICS' ClockBlocksTM family, this is our lowest skew, small clock buffer. See the ICS552-02 for a 1 to 8 low skew buffer. For more than eight outputs, see the MK74CBxxx BuffaloTM series of clock drivers. ICS makes many non-PLL and PLL based low skew output devices as well as Zero Delay Buffers to synchronize clocks. Contact us for all of your clocking needs.
ICS524 Features
* * * * * * * *
Extremely low skew outputs (50 ps maximum) Packaged in 8-pin SOIC Available in Pb (lead) free package Low power CMOS technology Operating voltages of 2.5 V to 5 V Output Enable pin tri-states outputs 5 V tolerant input clock Industrial temperature range
Block Diagram
Q0 Q1 ICLK Q2 Q3
IDTTM / ICSTM LOW SKEW 1 TO 4 CLOCK BUFFER
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ICS524
REV A 101705
ICS524 LOW SKEW 1 TO 4 CLOCK BUFFER
FAN OUT BUFFER
Pin Assignment
ICLK Q0 Q1 NC 1 2 3 4 8 7 6 5 8-pin SOIC GND Q3 Q2 VDD
Pin Descriptions
Pin Pin Number Name
1 2 3 4 5 6 7 8 ICLK Q0 Q1 NC VDD Q2 Q3 GND
Pin Type
Input Output Output Power Output Output Power Clock input, 5V tolerant input. Clock output 0. Clock output 1.
Pin Description
Do not connect this pin to anything. Connect to +2.5 V, +3.3 V or +5.0 V. Clock Output 2. Clock Output 3. Connect to ground.
External Components
A minimum number of external components are required for proper operation. A decoupling capacitor of 0.01 F should be connected between VDD on pin 5 and GND on pin 8, as close to the device as possible. A 33 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 ICS524 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 they do not, the output skew will be degraded. For example, using a 30 series termination on one output (with 33 on the others) will cause at least 15 ps of skew.
IDTTM / ICSTM LOW SKEW 1 TO 4 CLOCK BUFFER
2
ICS524
REV A 101705
ICS524 LOW SKEW 1 TO 4 CLOCK BUFFER
FAN OUT BUFFER
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS524. 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
Supply Voltage, VDD Output Enable and All Outputs ICLK Ambient Operating Temperature Storage Temperature Junction Temperature Soldering Temperature 7V
Rating
-0.5 V to VDD+0.5 V -0.5 V to 5.5 V -40 to +85C -65 to +150C 125C 260C
Recommended Operation Conditions
Parameter
Ambient Operating Temperature Power Supply Voltage (measured in respect to GND)
Min.
-40 +2.375
Typ.
Max.
+85 +5.25
Units
C V
DC Electrical Characteristics
VDD=2.5 V 5%, Ambient temperature -40 to +85C, unless stated otherwise
Parameter
Operating Voltage Input High Voltage, ICLK Input Low Voltage, ICLK Output High Voltage Output Low Voltage Operating Supply Current Nominal Output Impedance Input Capacitance Short Circuit Current
Symbol
VDD VIH VIL VOH VOL IDD ZO CIN IOS
Conditions
Note 1 Note 1 IOH = -16 mA IOL = 16 mA No load, 135 MHz ICLK
Min.
2.375 VDD/2+0.5 2
Typ.
Max.
2.625 5.5 VDD/2-0.5 0.4
Units
V V V V V mA pF mA
25 20 5 28
IDTTM / ICSTM LOW SKEW 1 TO 4 CLOCK BUFFER
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ICS524
REV A 101705
ICS524 LOW SKEW 1 TO 4 CLOCK BUFFER
FAN OUT BUFFER
DC Electrical Characteristics (continued)
VDD=3.3 V 5% , Ambient temperature -40 to +85C, unless stated otherwise
Parameter
Operating Voltage Input High Voltage, ICLK Input Low Voltage, ICLK Output High Voltage Output Low Voltage Output High Voltage (CMOS Level) Operating Supply Current Nominal Output Impedance Input Capacitance Short Circuit Current
Symbol
VDD VIH VIL VOH VOL VOH IDD ZO CIN IOS
Conditions
Note 1 Note 1 IOH = -25 mA IOL = 25 mA IOH = -12 mA No load, 135 MHz ICLK
Min.
3.15 VDD/2+0.7 2.4
Typ.
Max.
3.45 5.5 VDD/2-0.7 0.4
Units
V V V V V V
VDD-0.4 35 20 5 50
mA pF mA
VDD=5 V 5% , Ambient temperature -40 to +85C, unless stated otherwise
Parameter
Operating Voltage Input High Voltage, ICLK Input Low Voltage, ICLK Output High Voltage Output Low Voltage Output High Voltage (CMOS Level) Operating Supply Current Nominal Output Impedance Input Capacitance Short Circuit Current
Symbol
VDD VIH VIL VOH VOL VOH IDD ZO CIN IOS
Conditions
Note 1 Note 1 IOH = -35 mA IOL = 35 mA IOH = -12 mA No load, 135 MHz ICLK
Min.
4.75 VDD/2+1 2.4
Typ.
Max.
5.25 5.5 VDD/2-1 0.4
Units
V V V V V V
VDD-0.4 45 20 5 80
mA pF mA
Notes: 1. Nominal switching threshold is VDD/2
IDTTM / ICSTM LOW SKEW 1 TO 4 CLOCK BUFFER
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ICS524
REV A 101705
ICS524 LOW SKEW 1 TO 4 CLOCK BUFFER
FAN OUT BUFFER
AC Electrical Characteristics
VDD = 2.5 V 5%, Ambient Temperature -40 to +85C, unless stated otherwise
Parameter
Input Frequency Output Rise Time Output Fall Time Propagation Delay Output to Output Skew Device to Device Skew tOR tOF Note 1 Note 2 Rising edges at VDD/2 Rising edges at VDD/2 0.8 to 2.0 V, CL=15 pF 2.0 to 0.8 V, CL=15 pF 2.2
Symbol
Conditions
Min.
0
Typ.
1.0 1.0 3 0
Max. Units
200 1.5 1.5 5 50 500 MHz ns ns ns ps ps
VDD = 3.3 V 5%, Ambient Temperature -40 to +85C, unless stated otherwise
Parameter
Input Frequency Output Rise Time Output Fall Time Propagation Delay Output to Output Skew Device to Device Skew tOR tOF Note 1 Note 2 Rising edges at VDD/2 Rising edges at VDD/2 0.8 to 2.0 V, CL=15 pF 2.0 to 0.8 V, CL=15 pF 2.0
Symbol
Conditions
Min.
0
Typ.
0.6 0.6 2.4 0
Max. Units
200 1.0 1.0 4 50 500 MHz ns ns ns ps ps
VDD = 5 V 5%, Ambient Temperature -40 to +85C, unless stated otherwise
Parameter
Input Frequency Output Rise Time Output Fall Time Propagation Delay Output to Output Skew Device to Device Skew tOR tOF Note 1 Note 2 Rising edges at VDD/2 Rising edges at VDD/2 0.8 to 2.0 V, CL=15 pF 2.0 to 0.8 V, CL=15 pF 1.8
Symbol
Conditions
Min.
0
Typ.
0.3 0.3 2.5 0
Max. Units
200 0.7 0.7 4 50 500 MHz ns ns ns ps ps
Notes: 1. With rail to rail input clock 2. Between any 2 outputs with equal loading. 3. Duty cycle on outputs will match incoming clock duty cycle. Consult ICS for tight duty cycle clock generators.
Thermal Characteristics
Parameter
Thermal Resistance Junction to Ambient
Symbol
JA JA JA JC
Conditions
Still air 1 m/s air flow 3 m/s air flow
Min.
Typ.
150 140 120 40
Max. Units
C/W C/W C/W C/W
Thermal Resistance Junction to Case
IDTTM / ICSTM LOW SKEW 1 TO 4 CLOCK BUFFER
5
ICS524
REV A 101705
ICS524 LOW SKEW 1 TO 4 CLOCK BUFFER
FAN OUT BUFFER
Package Outline and Package Dimensions (8-pin SOIC, 150 Mil. Narrow Body) Package dimensions are kept current with JEDEC Publication No. 95
Millimeters Symbol
8
Inches* Min Max
Min
Max
A A1 B
E H
1.35 0.10 0.33 0.19 4.80 3.80 5.80 0.25 0.40 0
1.75 0.25 0.51 0.25 5.00 4.00 6.20 0.50 1.27 8
.0532 .0040 .013 .0075 .1890 .1497 .2284 .010 .016 0
.0688 .0098 .020 .0098 .1968 .1574 .2440 .020 .050 8
C D E e H h L
INDEX AREA
1.27 BASIC
0.050 BASIC
12 D
*For reference only. Controlling dimensions in mm.
A A1 h x 45 C
-Ce
B SEATING PLANE L
.10 (.004)
C
Ordering Information
Part / Order Number
ICS524MILF ICS524MILFT
Marking
524MILF 524MILF
Shipping Packaging
Tubes Tape and Reel
Package
8-pin SOIC 8-pin SOIC
Temperature
-40 to +85 C -40 to +85 C
Parts that are ordered with a "LF" suffix to the part number are the Pb-Free configuration and are RoHS compliant. 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.
IDTTM / ICSTM LOW SKEW 1 TO 4 CLOCK BUFFER
6
ICS524
REV A 101705
ICS524 LOW SKEW 1 TO 4 CLOCK BUFFER
FAN OUT BUFFER
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