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ICS513
LOCO™ PLL Clock Generator
Description
The ICS513 LOCO™ is the most cost effective
way to generate a high quality, high frequency
clock output from a 14.31818 MHz crystal or
clock input. The name LOCO stands for LOw
Cost Oscillator, as it is designed to replace crystal
oscillators in many electronic systems. Using
Phase-Locked-Loop (PLL) techniques, the device
uses a standard, inexpensive crystal to produce
output clocks up to 100 MHz.
Stored in the chip’s ROM is the ability to generate
5 different output frequencies, allowing one chip
to work in different speed processor systems.
The device also has a power down mode that turns
off the clock outputs when both select pins are low.
In this mode, the internal PLL is not running.
Block Diagram
Features
• Packaged as 8 pin SOIC
• ICS’ lowest cost PLL clock plus reference
• Produces common computer frequencies
• Input crystal frequency typically 14.3182 MHz
• Output clock frequencies up to 100 MHz
• Low jitter - 40 ps one sigma
• Compatible with all popular CPUs
• Duty cycle of 45/55
• Custom frequencies available
• Operating voltages of 3.0 to 5.5 V
• Power down mode turns off chip
• 25mA drive capability at TTL levels
• Advanced, low power CMOS process
S1, S0
14.31818 MHz
crystal
or clock
X1/ICLK
X2
VDD GND
2
Crystal
Oscillator
Optional crystal capacitors
PLL
Clock
Synthesis
and Control
Circuitry
Output
Buffer
Output
Buffer
CLK
REF
MDS 513 B 1 Revision 080699 Printed 12/4/00
Integrated Circuit Systems • 525 Race Street • San Jose • CA• 95126 • (408)295-9800tel• (408)295-9818fax
Page 2
ICS513
LOCO™ PLL Clock Generator
Pin Assignment
X1/ICLK
VDD
GND
REF
1 8
2
3
4
X2
7
S1
6
S0
5
CLK
14.31818MHz Crystal or Clock Input
S1 S0 CLK Multiplier Accuracy
0 0 Power Down CLK - -
0 1 100 6.984 1 ppm
M 0 24 1.676 1 ppm
M 1 14.31818 1 0 ppm
1 0 48 3.353 0.017%
1 1 3.6864 0.2576 0.044%
0 = connect directly to ground.
1 = connect directly to VDD.
M = leave unconnected (floating).
CLK and REF stop low in power down state.
Pin Descriptions
Number Name Type Description
1 X1/ICLK I Crystal connection to 14.31818 MHz crystal or clock input.
2 VDD P Connect to +3.3 V or +5 V.
3 GND P Connect to ground.
4 REF O Reference 14.31818 MHz crystal oscillator buffered clock output.
5 CLK O Clock output per table above.
6 S0 TI Select 0 for output clock. Connect to GND or VDD or float. See table above.
7 S1 TI Select 1 for output clock. Connect to GND or VDD or float. See table above.
8 X2 O Crystal connection to 14.31818 MHz crystal. Leave unconnected for clock input.
Clock Decoding Table (MHz) with
Key: I = Input, TI = Tri-Level Input, O = output, P = power supply connection
Notes: 1. With S1 = S0 = 0, the internal PLL is turned off and the CLK output stops low.
The crystal oscillator and REF output are still active.
2. With a clock input, the phase relationship between the input and output clocks can change
each time the device is powered on.
If a fixed phase relationship is required, please use our ICS571 or other zero delay multiplier.
MDS 513 B 2 Revision 080699 Printed 12/4/00
Integrated Circuit Systems • 525 Race Street • San Jose • CA• 95126 • (408)295-9800tel• (408)295-9818fax
Page 3
ICS513
ABSOLUTE MAXIMUM RATINGS (stresses beyond these can permanently damage the device)
DC CHARACTERISTICS (VDD = 5.0 V unless otherwise noted)
AC CHARACTERISTICS (VDD = 5.0V unless otherwise noted)
LOCO™ PLL Clock Generator
Electrical Specifications
Parameter Conditions Minimum Typical Maximum Units
Supply Voltage, VDD Referenced to GND 7 V
Inputs Referenced to GND -0.5 VDD+0.5 V
Clock Output Referenced to GND -0.5 VDD+0.5 V
Ambient Operating Temperature 0 70 °C
Soldering Temperature Max of 10 seconds 260 °C
Storage temperature -65 150 °C
Operating Voltage, VDD 3 5.5 V
Input High Voltage, VIH, ICLK only ICLK (Pin 1) (VDD/2)+1 VDD/2 V
Input Low Voltage, VIL, ICLK only ICLK (Pin 1) VDD/2 (VDD/2)-1 V
Input High Voltage, VIH S0 2 V
Input Low Voltage, VIL S0 0.8 V
Input High Voltage, VIH S1 VDD-0.5 V
Input Low Voltage, VIM S1 VDD/2 V
Input Low Voltage, VIL S1 0.5 V
Output High Voltage, VOH IOH=-25mA 2.4 V
Output Low Voltage, VOL IOL=25mA 0.4 V
IDD Operating Supply Current No Load, 100 MHz 20 mA
IDD Power Down Supply Current, 3.3 V S1 = S0 = 0 1.5 mA
Short Circuit Current CLK output ±70 mA
On-Chip Pull-up Resistor Pin 6 270 kΩ
Input Capacitance, S1, S0 Pins 6, 7 4 pF
Input Frequency, crystal input 5 14.31818 27 MHz
Input Frequency, clock input 2 14.31818 50 MHz
Output Frequency VDD = 4.5 to 5.5 V 14 100 140 MHz
Output Frequency VDD = 3.0 to 3.6 V 14 100 100 MHz
Output Clock Rise Time 0.8 to 2.0V 1 ns
Output Clock Fall Time 2.0 to 0.8V 1 ns
Output Clock Duty Cycle 1.5V, up to 140 MHz 45 49 to 51 55 %
Power up time, from PD to outputs stable 5 10 ms
Power down time, from running to PD state 50 ns
Absolute Clock Period Jitter Deviation from mean ±110 ps
One Sigma Clock Period Jitter 40 ps
MDS 513 B 3 Revision 080699 Printed 12/4/00
Integrated Circuit Systems • 525 Race Street • San Jose • CA• 95126 • (408)295-9800tel• (408)295-9818fax
Page 4
ICS513
Inches
Millimeters
LOCO™ PLL Clock Generator
External Components / Crystal Selection
The ICS513 requires a 0.01µF decoupling capacitor to be connected between VDD and GND. It must be
connected close to the ICS513 to minimize lead inductance. No external power supply filtering is required
for this device. A 33Ω terminating resistor can be used next to the CLK and REF pins. The total on-chip
capacitance is approximately 12 pF, so a parallel resonant, fundamental mode crystal should be used. For
crystals with a specified load capacitance greater than 12 pF, crystal capacitors should be connected from
each of the pins X1 and X2 to Ground as shown in the Block Diagram on page 1. The value (in pF) of
these crystal caps should be = (CL-12)*2, where CL is the crystal load capacitance in pF. These external
capacitors are only required for applications where the exact frequency is critical. For a clock input,
connect to X1 and leave X2 unconnected (no capacitors on either).
Package Outline and Package Dimensions
8 pin SOIC
Q
Pin 1
e
D
E H
h x 45°
A
c
b
L
Symbol Min Max Min Max
A 0.055 0.068 1.397 1.7272
b 0.013 0.019 0.330 0.483
D 0.185 0.200 4.699 5.080
E 0.150 0.160 3.810 4.064
H 0.225 0.245 5.715 6.223
e
h 0.015 0.381
L 0.016 0.035 0.406 0.889
Q 0.004 0.01 0.102 0.254
Ordering Information
Part/Order Number Marking Package Temperature
ICS513M ICS513M 8 pin SOIC 0-70°C
ICS513MT ICS513M 8 pin SOIC on tape and reel 0-70°C
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 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.
MDS 513 B 4 Revision 080699 Printed 12/4/00
Integrated Circuit Systems • 525 Race Street • San Jose • CA• 95126 • (408)295-9800tel• (408)295-9818fax
LOCO is a trademark of ICS
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