PRELIMINARY DATASHEET
CLOCK DIVIDER ICS544-01
IDT™ / ICS™
CLOCK DIVIDER 1
ICS544-01 REV A 042705
Description
The ICS544-01 is crystal oscillator module IC with
divide by 512 frequency output. It employs a 16.777216
MHz fundamental frequency crystal source oscillator to
generate 32.768 kHz output crystal oscillator output. In
addition a divide by 256, 64 and 32 options are also
provided through select pins. The chip has an OE pin
that tri-states the output and stops the oscillator circuits.
The ICS544-01 is a member of ICS’ ClockBlocksTM
family of clock building blocks. See the ICS541 and
ICS542 for other clock dividers, and the ICS501, 502,
511, 512, and 525 for clock multipliers.
Features
•Packaged in 8-pin SOIC or die
•Available in Pb-free package
•ICS’ lowest cost clock divider
•Easy to use with other generators and buffers
•Input crystal at 16.777216MHz
•Output clock duty cycle of 45/55
•Output Enable
•Advanced, low-power CMOS process
•Operating voltage of 2.25 V to 3.6 V
•Does not degrade phase noise - no PLL
•Available in industrial temperature range
Block Diagram
Divider and
Selection
Circuitry
/32, /64
/256, /512,
CLK1
OE
GND
VDD
X1
X2
16.777216MHz
crystal input
Optional tuning
capacitors
S1, S0 (1:0)
ICS544-01
CLOCK DIVIDER CLOCK DIVIDER
IDT™ / ICS™
CLOCK DIVIDER 2
ICS544-01 REV A 042705
Pin Assignment
8-pin (150 mil) SOIC
Clock Divider Table
0 = connect directly to ground
1 = connect directly to VDD
Pin Descriptions
External Components
Series Termination Resistor
Clock output traces over one inch should use series
termination. To series terminate a 50Ω trace (a
commonly used trace impedance), place a 33Ω resistor
in series with the clock line, as close to the clock output
pin as possible. The nominal impedance of the clock
output is 20Ω.
On chip capacitors- Crystal capacitors should be
connected from pins X1 to ground and X2 to ground to
optimize the initial accuracy. The value (in pf) of these
crystal caps equal (CL-12)*2 in this equation,
CL=crystal load capacitance in pf. For example, for a
crystal with a 16 pF load cap, each external crystal cap
would be 8 pF. [(16-12)x2]=8.
Decoupling Capacitor
As with any high-performance mixed-signal IC, the
ICS544-01 must be isolated from system power supply
noise to perform optimally.
A decoupling capacitor of 0.01µF must be connected
between VDD and the PCB ground plane.
PCB Layout Recommendations
For optimum device performance and lowest output
phase noise, the following guidelines should be
observed.
1) The 0.01µF decoupling capacitor should be mounted
X1/ I CLK
X2
GND
VDD
S0
OE
CLK
S11
2
3
4
8
7
6
5
S1 S0 CLK
0 0 Input/32
0 1 Input/64
10 Input/256
11 Input/512
Pin
Number
Pin
Name
Pin
Type Pin Description
1 X1/ICLK XI Crystal input.
2 X2 Xo Connect to crystal for crystal input and leave open for clock input.
3 GND Power Connect to ground.
4 S0 Input Select 0 for output clock. Connect to GND or VDD, per divider table above.
Internal pull-up resistor.
5 CLK Output Clock output per table above. Internal Pull down resistor.
6 OE Input Output Enable.Tri-states output clock when low. Also shuts down the oscillator
circuit. Internal pull-up resistor. OE=1 normal operation.
7 VDD Power Connect to 2.25 V to 3.6 V.
8 S1 Input Select 1 for output clock. Connect to GND or VDD, per divider table above.
Internal pull-up resistor.
ICS544-01
CLOCK DIVIDER CLOCK DIVIDER
IDT™ / ICS™
CLOCK DIVIDER 3
ICS544-01 REV A 042705
on the component side of the board as close to the VDD
pin as possible. No vias should be used between
decoupling capacitor and VDD pin. The PCB trace to
VDD pin should be kept as short as possible, as should
the PCB trace to the ground via. Distance of the ferrite
bead and bulk decoupling from the device is less
critical.
2) To minimize EMI, the 33Ω series termination resistor
(if needed) should be placed close to the clock output.
3) An optimum layout is one with all components on the
same side of the board, minimizing vias through other
signal layers (the ferrite bead and bulk decoupling
capacitor can be mounted on the back). Other signal
traces should be routed away from the ICS544-01. This
includes signal traces just underneath the device, or on
layers adjacent to the ground plane layer used by the
device.
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS544-01. 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.
Recommended Operation Conditions
Item Rating
Supply Voltage, VDD 7 V
All Inputs and Outputs -0.5 V to VDD+0.5 V
Ambient Operating Temperature 0 to +70°C
Storage Temperature -65 to +150°C
Junction Temperature 125°C
Soldering Temperature 260°C
Parameter Min. Typ. Max. Units
Ambient Operating Temperature -40 +85 °C
Power Supply Voltage (measured in respect to GND) 2.25 3.6 V
ICS544-01
CLOCK DIVIDER CLOCK DIVIDER
IDT™ / ICS™
CLOCK DIVIDER 4
ICS544-01 REV A 042705
DC Electrical Characteristics
Unless stated otherwise, VDD = 2.25 V to 3.6 V, CL=15 pf±5%, Ambient Temperature -40°C to +70°C
AC Electrical Characteristics
Unless stated otherwise, VDD = 2.25 V to 3.6 V±5%, CL=15 pf±5%, Ambient Temperature -40°C to +70°C
Thermal Characteristics
Parameter Symbol Conditions Min. Typ. Max. Units
Operating Voltage VDD 2.25 3.6 V
Input High Voltage VIH S0, S1, OE, ICLK 0.7VDD V
Input Low Voltage VIL S0, S1, OE, ICLK 0.3VDD V
Output High Voltage VOH IOH = -2 mA VDD-0.4 VDD-0.15 V
Output Low Voltage VOL IOL = 2 mA 0.15 0.4 V
Operating Supply Current IDD VDD =2.25 V - 2.75 V 0.3 0.6 mA
Operating Supply Current IDD VDD= 2.75 V - 3.6 V 0.5 1 mA
Standby Current ISB OE=0 10 ua
Short Circuit Current IOS ±40 mA
Input Capacitance CIN S0, S1, OE 4 pF
Nominal Output Impedance ZOat VDD/2 20 Ω
Internal Pull-up Resistor Rpup TBD kΩ
Internal Pull-down Resistor Rpd TBD kΩ
Parameter Symbol Conditions Min. Typ. Max. Units
Input Frequency, clock input VDD = 3.3 V 0 16.777216 MHz
Output Rise Time tOR 0.1VDD to 0.9VDD 0.2 1 µs
Output Fall Time tOF 0.9VDD to 0.1VDD 0.2 1 µs
Duty Cycle at VDD/2 45 49 to 51 55 %
Output Enable Delay Time tOE OE going high to CLK
output valid
2µs
Output Disable Delay Time tOD OE going low to CLK
output invalid
2µs
Parameter Symbol Conditions Min. Typ. Max. Units
Thermal Resistance Junction to
Ambient
θJA Still air 150 °C/W
θJA 1 m/s air flow 140 °C/W
θJA 3 m/s air flow 120 °C/W
Thermal Resistance Junction to Case θJC 40 °C/W
ICS544-01
CLOCK DIVIDER CLOCK DIVIDER
IDT™ / ICS™
CLOCK DIVIDER 5
ICS544-01 REV A 042705
Marking Diagram (ICS554M-01)
Marking Diagram (ICS554MI-01)
Marking Diagram (ICS554M-01LF)
Marking Diagram (ICS554MI-01LF)
Notes:
1. ###### is the lot number.
2. YYWW is the last two digits of the year and week that the part was assembled.
3. “LF” denotes Pb (lead) free package.
4. “I” denotes industrial temperature range.
5. Bottom Marking: (origin)
Origin = country of origin if not USA.
554M-01
######
YYWW
14
58
554MI-01
######
YYWW
14
58
554M01LF
######
YYWW
14
58
554MI01L
######
YYWW
14
58
ICS544-01
CLOCK DIVIDER CLOCK DIVIDER
IDT™ / ICS™
CLOCK DIVIDER 6
ICS544-01 REV A 042705
Package Outline and Package Dimensions (8-pin SOIC, 150 Mil. Body)
Package dimensions are kept current with JEDEC Publication No. 95
INDEX
AREA
1 2
8
D
E
SEATING
PLANE
A1
A
e
- C -
B
.10 (.004) C
C
L
H
h x 45
Millimeters Inches
Symbol Min Max Min Max
A 1.35 1.75 .0532 .0688
A1 0.10 0.25 .0040 .0098
B 0.33 0.51 .013 .020
C 0.19 0.25 .0075 .0098
D 4.80 5.00 .1890 .1968
E 3.80 4.00 .1497 .1574
e 1.27 BASIC 0.050 BASIC
H 5.80 6.20 .2284 .2440
h 0.25 0.50 .010 .020
L 0.40 1.27 .016 .050
α0°8°0°8°
ICS544-01
CLOCK DIVIDER CLOCK DIVIDER
IDT™ / ICS™
CLOCK DIVIDER 7
ICS544-01 REV A 042705
Ordering Information
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)
assumes no responsibility for either its use or for the 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
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.
Part / Order Number Marking Shipping Packaging Package Temperature
ICS544M-01 544M-01 Tubes 8-pin SOIC 0 to +70° C
ICS544M-01T 544M-01 Tape and Reel 8-pin SOIC 0 to +70° C
ICS544MI-01 544MI-01 Tubes 8-pin SOIC -40 to +85° C
ICS544MI-01T 544MI-01 Tape and Reel 8-pin SOIC -40 to +85° C
ICS544M-01LF 544M01LF Tubes 8-pin SOIC 0 to +70° C
ICS544M-01LFT 544M01LF Tape and Reel 8-pin SOIC 0 to +70° C
ICS544MI-01LF 544MI01L Tubes 8-pin SOIC -40 to +85° C
ICS544MI-01LFT 544MI01L Tape and Reel 8-pin SOIC -40 to +85° C
ICS554-01DWF Die on uncut, probed wafers 0 to +70° C
ICS554-01DPK Tested die in waffle pack 0 to +70° C
© 2006 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. IDT and the IDT logo are trademarks of Integrated Device
Technology, Inc. Accelerated Thinking is a service mark of Integrated Device Technology, Inc. All other brands, product names and marks are or may be trademarks or registered
trademarks used to identify products or services of their respective owners.
Printed in USA
Corporate Headquarters
Integrated Device Technology, Inc.
6024 Silver Creek Valley Road
San Jose, CA 95138
United States
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+408 284 8200 (outside U.S.)
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Integrated Device Technology
Singapore (1997) Pte. Ltd.
Reg. No. 199707558G
435 Orchard Road
#20-03 Wisma Atria
Singapore 238877
+65 6 887 5505
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Prime House
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ICS544-01
CLOCK DIVIDER CLOCK DIVIDER
