IDT ICS501BMLFT Locoâ ¢ pll clock multiplier Datasheet

DATASHEET
ICS501B
LOCO™ PLL CLOCK MULTIPLIER
Description
Features
The ICS501B LOCOTM is the most cost effective way to
generate a high-quality clock output from a lower
frequency crystal or clock input. The name LOCO
stands for Low Cost Oscillator, as it is designed to
replace crystal oscillators in most electronic systems.
Using Phase-Locked Loop (PLL) techniques, the
device uses a standard fundamental mode,
inexpensive crystal to produce output clocks up to 15
MHz.
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Stored in the chip’s ROM is the ability to generate nine
different multiplication factors, allowing one chip to
output many common frequencies (see table on page
2).
The device also has an output enable pin which
tri-states the clock output when the OE pin is taken low.
This product is intended for clock generation. It has low
output jitter (variation in the output period), but input to
output skew and jitter are not defined or guaranteed.
For applications which require defined input to output
skew, use the ICS570B.
Packaged as 8 pin SOIC or die
Available in Pb (lead) free package
IDT’s lowest cost PLL clock
Zero ppm multiplication error
Output clock frequencies up to 15 MHz
Extremely low jitter of 25 ps (one sigma)
Compatible with popular CPUs
Duty cycle of 45/55 up to 20 MHz
Nine selectable frequencies
Operating voltage of 3.3 V or 5.5 V
Tri-state output for board level testing
25 mA drive capability at TTL levels
Ideal for oscillator replacement
Industrial temperature version available
Advanced, low-power CMOS process
Block Diagram
VDD
S1:0
2
PLL Clock
Multiplier
Circuitry
and ROM
X1/ICLK
Crystal or
Clock input
Crystal
Oscillator
CLK
X2
Optional crystal capacitors
GND
IDT™ / ICS™ LOCO™ PLL CLOCK MULTIPLIER
1
OE
ICS501B
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ICS501B
LOCO™ PLL CLOCK MULTIPLIER
CLOCK MULTIPLIER
Pin Assignment
Clock Output Table
S1 S0
CLK
Minimum Input
0
0
4X input
0.5 MHz
X1/ I CLK
1
8
X2
0
M
5.3125X input
1 MHz
VDD
2
7
OE
0
1
5X input
0.5 MHz
GND
3
6
S0
M
0
6.25X input
0.5 MHz
M
M
2X input
1 MHz
M
1
3.125X input
1 MHz
1
0
6X input
0.5MHz
1
M
3X input
0.5MHz
1
1
8X input
0.5MHz
S1
5
4
CLK
8 Pi n ( 150 mi l ) SOI C
0 = connect directly to ground
1 = connect directly to VDD
M = leave unconnected (floating)
Pin Descriptions
Pin
Number
Pin
Name
Pin
Type
1
XI/ICLK
Input
Crystal connection or clock input.
2
VDD
Power
Connect to +3.3 V or +5 V.
3
GND
Power
Connect to ground.
4
S1
Tri-level Iinput
5
CLK
Output
6
S0
Tri-level Input
7
OE
Input
8
X2
Output
IDT™ / ICS™ LOCO™ PLL CLOCK MULTIPLIER
Pin Description
Select 1 for output clock. Connect to GND or VDD or float.
Clock output per table above.
Select 0 for output clock. Connect to GND or VDD or float.
Output enable. Tri-states CLK output when low. Internal pull-up.
Crystal connection. Leave unconnected for clock input.
2
ICS501B
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ICS501B
LOCO™ PLL CLOCK MULTIPLIER
CLOCK MULTIPLIER
External Components
parallel resonant, fundamental mode crystal should be
used. The device crystal connections should include
pads for small capacitors from X1 to ground and from
X2 to ground. These capacitors are used to adjust the
stray capacitance of the board to match the nominally
required crystal load capacitance. Because load
capacitance can only be increased in this trimming
process, it is important to keep stray capacitance to a
minimum by using very short PCB traces (and no vias)
between the crystal and device. Crystal capacitors, if
needed, must be connected from each of the pins X1
and X2 to ground.
Decoupling Capacitor
As with any high-performance mixed-signal IC, the
ICS501B must be isolated from system power supply
noise to perform optimally.
A decoupling capacitor of 0.01µF must be connected
between VDD and the GND. It must be connected close
to the ICS501B to minimize lead inductance. No
external power supply filtering is required for the
ICS501B.
The value (in pF) of these crystal caps should equal (CL
-12 pF)*2. In this equation, CL= crystal load capacitance
in pF. Example: For a crystal with a 16 pF load
capacitance, each crystal capacitor would be 8 pF
[(16-12) x 2] = 8.
Series Termination Resistor
A 33Ω terminating resistor can be used next to the CLK
pin for trace lengths over one inch.
Crystal Load Capacitors
The total on-chip capacitance is approximately 12 pF. A
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS501B. These ratings,
which are standard values for IDT 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
7V
All Inputs and Outputs
-0.5 V to VDD+0.5 V
Ambient Operating Temperature
-40 to +85° C
Storage Temperature
-65 to +150° C
Soldering Temperature
260° C
Recommended Operation Conditions
Parameter
Min.
Ambient Operating Temperature
Power Supply Voltage (measured in respect to GND)
IDT™ / ICS™ LOCO™ PLL CLOCK MULTIPLIER
3
Typ.
Max.
Units
0
+70
°C
+3.14
+5.25
V
ICS501B
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ICS501B
LOCO™ PLL CLOCK MULTIPLIER
CLOCK MULTIPLIER
DC Electrical Characteristics
VDD=5.0 V ±5% , Ambient temperature 0 to +70° C, unless stated otherwise
Parameter
Operating Voltage
Symbol
Conditions
VDD
Min.
Typ.
3.14
Input High Voltage, ICLK only
VIH
ICLK (pin 1)
Input Low Voltage, ICLK only
VIL
ICLK (pin 1)
Input High Voltage
VIH
OE (pin 7)
Input Low Voltage
VIL
OE (pin 7)
Input High Voltage
VIH
S0, S1
Input Low Voltage
VIL
S0, S1
Output High Voltage
VOH
IOH = -25 mA
Output Low Voltage
VOL
IOL = 25 mA
Max.
Units
5.25
V
(VDD/2)+1
V
(VDD/2)-1
2.0
V
V
0.8
VDD-0.5
V
V
0.5
2.4
V
V
0.4
V
IDD Operating Supply Current
No load
20
mA
Short Circuit Current
CLK output
+70
mA
On-Chip Pull-up Resistor
Pin 7
270
kΩ
Input Capacitance, S1, S0, and OE
Pins 4, 6, 7
4
pF
20
Ω
Nominal Output Impedance
IDT™ / ICS™ LOCO™ PLL CLOCK MULTIPLIER
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ICS501B
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LOCO™ PLL CLOCK MULTIPLIER
CLOCK MULTIPLIER
AC Electrical Characteristics
VDD = 5.0 V ±5%, Ambient Temperature 0 to +70° C, unless stated otherwise
Parameter
Symbol
Input Frequency, crystal input
FIN
Input Frequency, clock input
FIN
Output Frequency, VDD = 5.0 V ±5%
Output Frequency, VDD = 3.3 V ±5%
FOUT
FOUT
Conditions
Min.
Typ.
Max.
Units
7.5
MHz
0.5
7.5
MHz
0° C to +70° C
4
15
MHz
-40° C to +85° C
4
15
MHz
0° C to +70° C
4
15
MHz
-40° C to +85° C
4
15
MHz
Output Clock Rise Time
tOR
0.8 to 2.0 V, Note 1
1
ns
Output Clock Fall Time
tOF
2.0 to 8.0 V, Note 1
1
ns
Output Clock Duty Cycle
tOD
1.5 V, up to 25 MHz
PLL Bandwidth
45
49-51
10
55
%
kHz
Output Enable Time, OE high to
output on
50
ns
Output Disable Time, OE low to
tri-state
50
ns
Absolute Clock Period Jitter
tja
Deviation from
mean, Note 1
+70
ps
One Sigma Clock Period Jitter
tjs
Note 1
25
ps
Note 1: Measured with 15 pF load.
IDT™ / ICS™ LOCO™ PLL CLOCK MULTIPLIER
5
ICS501B
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LOCO™ PLL CLOCK MULTIPLIER
CLOCK MULTIPLIER
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
E
A
A1
B
C
D
E
e
H
h
L
α
H
INDEX
AREA
1 2
D
A
Min
Max
Min
1.35
1.75
0.10
0.25
0.33
0.51
0.19
0.25
4.80
5.00
3.80
4.00
1.27 BASIC
5.80
6.20
0.25
0.50
0.40
1.27
0°
8°
Max
.0532
.0688
.0040
.0098
.013
.020
.0075
.0098
.1890
.1968
.1497
.1574
0.050 BASIC
.2284
.2440
.010
.020
.016
.050
0°
8°
h x 45
A1
C
-Ce
SEATING
PLANE
B
L
.10 (.004)
C
Ordering Information
Part / Order Number
Marking
Shipping Packaging
Package
Temperature
ICS501BM
ICS501BMT
ICS501BMI
ICS501BMIT
ICS501BMLF
ICS501BMLFT
ICS501BMILF
ICS501BMILFT
ICS501-DWF
ICS501-DPK
501BM
501BM
501BMI
501BMI
501BML
501BML
501BMIL
501BMIL
-
Tubes
Tape and Reel
Tubes
Tape and Reel
Tubes
Tape and Reel
Tubes
Tape and Reel
Die on uncut, probed wafers
Tested die in waffle pack
8-pin SOIC
8-pin SOIC
8-pin SOIC
8-pin SOIC
8-pin SOIC
8-pin SOIC
8-pin SOIC
8-pin SOIC
0 to +70° C
0 to +70° C
-40 to +85° C
-40 to +85° C
0 to +70° C
0 to +70° C
-40 to +85° C
-40 to +85° C
0 to +70° C
0 to +70° C
“LF” denotes Pb (lead) free package.
While the information presented herein has been checked for both accuracy and reliability, Integrated Device Technology (IDT)
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 IDT. IDT reserves the right to change any
circuitry or specifications without notice. IDT does not authorize or warrant any IDT product for use in life support devices or
critical medical instruments.
IDT™ / ICS™ LOCO™ PLL CLOCK MULTIPLIER
6
ICS501B
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ICS501B
LOCO™ PLL CLOCK MULTIPLIER
CLOCK MULTIPLIER
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