DATASHEET
525-01/02
USER CONFIGURABLE CLOCK
Description
Features
The ICS525-01/02 are the most flexible way to generate
a high-quality, high-accuracy, high-frequency clock
output from an inexpensive crystal or clock input. The
user can configure the device to produce nearly any
output frequency from any input frequency by
grounding or floating the select pins. Neither
microcontroller, software, nor device programmer are
needed to set the frequency. Using Phase-Locked Loop
(PLL) techniques, the device accepts a standard
fundamental mode, inexpensive crystal to produce
output clocks up to 250MHz. It can also produce a
highly accurate output clock from a given input clock,
keeping them frequency locked together.
• Packaged in 28-pin SSOP (150 mil body) or 28-pin
•
VFQFPN (4x4mm body)
Industrial and commercial versions available in Pb
(lead) free package
• User determines the output frequency by setting all
•
•
•
•
•
•
•
•
•
•
•
•
For similar capability with a serial interface, use the
307. For simple multipliers to produce common
frequencies, refer to the 50x family of parts, which are
smaller and more cost effective.
These products are intended for clock generation. They
have low output jitter (variation in the output period),
but input to output skew and jitter are not defined nor
guaranteed. For applications which require defined
input to output timing, use the 527-01.
internal dividers
Eliminates need for custom oscillators
No software needed
Online calculator determines register settings
Pull-ups on all select inputs
Input crystal frequency of 5 – 27 MHz
Input clock frequency of 2 – 50 MHz
Very low jitter
Duty cycle of 45/55 up to 200MHz
Operating voltage of 3.0V or 5.5V
Ideal for oscillator replacement
Industrial temperature version available
For Zero Delay, refer to the 527
Block Diagram
VDD
2
PD
X1/ICLK
Crystal or clock
input
Crystal
Oscillator
Reference
Divider
X2
VCO
Output
Divider
VCO
Divider
Optional crystal capacitors
7
R6:R0
© 2021 Renesas Electronics Corporation
CLK
Phase Comparator,
Charge Pump, and
Loop Filter
9
V8:V0
1
REF
2
GND
3
S2:S0
525-01/02
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USER CONFIGURABLE CLOCK
CLOCK MULTIPLIER
27
R3
S0
3
26
R2
S1
4
25
R1
S2
5
24
VDD
6
X1/ICLK
REF
2
VDD
R6
R0
R4
R1
28
R2
1
R3
R5
R4
Pin Assignments
28
27
26
25
24
23
22
R5
1
21
CLK
R0
R6
2
20
GND
23
VDD
S0
3
19
PD
7
22
REF
X2
8
21
CLK
S1
4
18
V8
GND
9
20
GND
S2
5
17
V7
V0
10
19
PD
VDD
6
16
V6
V1
11
18
V8
V2
12
17
V7
X1/CLKIN
7
15
V5
V3
13
16
V6
V4
14
15
V5
12
13
14
V3
V4
11
V2
GND
10
V1
9
V0
8
X2
EPAD
28-pin VFQFPN
28-pin SSOP
Pin Descriptions
Pin
Number
Pin
Name
Pin
Type
1, 2,
24-28
R5, R6,
R0-R4
I(PU)
Reference divider word input pins determined by user. Forms a binary number from 0
to 127.
3, 4, 5
S0, S1, S2
I(PU)
Select pins for output divider determined by user. See table on page 3.
6, 23
VDD
Power
Connect to VDD.
7
X1/ICLK
X1
Crystal connection. Connect to a parallel resonant fundamental crystal or input clock.
8
X2
X2
Crystal connection. Connect to a crystal or leave unconnected for clock.
9, 20
GND
Power
Connect to ground.
10 - 18
V0 - V8
I(PU)
VCO divider word input pins determined by user. Forms a binary number from 0 to 511.
19
PD
Input
Power-down. Active low. Turns off entire chip when low. Clock outputs tri-stated.
21
CLK
Output
Output clock determined by status of R0-R6, V-V8, S0-S2, and input frequency.
22
REF
Output
Reference output. Buffered crystal oscillator (or clock ) output.
Pin Description
KEY: I(PU) = Input with internal pull-up resistor; X1, X2 = crystal connections
© 2021 Renesas Electronics Corporation
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USER CONFIGURABLE CLOCK
CLOCK MULTIPLIER
525-01 Output Frequency and Output Divider Table
S2
S1
S0 CLK Output
Pin 5 Pin 4 Pin 3
Divider
Output Frequency Range (MHz)
VDD = 5 V
VDD = 3.3 V
0 - 70C
-40 to +85C
0 - 70C
-40 to +85C
3–26
3–23
3–18
3–16
0
0
0
10
0
0
1
2
15–160
15–140
15–100
15–90
0
1
0
8
3.75–40
3.75–36
3.75–25
3.75–22
0
1
1
4
7.5–80
7.5–72
7.5–50
7.5–45
1
0
0
5
6–50
6–45
6–34
6–30
1
0
1
7
4–40
4–36
4–26
4–23
1
1
0
9
3.3–33.3
3.3–30
3.3–20
3.3–18
1
1
1
6
5–53
5–47
5–27
5–24
525-02 Output Frequency and Output Divider Table
S2
S1
S0 CLK Output
Pin 5 Pin 4 Pin 3
Divider
0
0
0
6
Output Frequency Range (MHz)
VDD = 5 V
VDD = 3.3 V
-40 to +85C
-40 to +85C
5–67
5–40
0
0
1
2
15–200
15–120
0
1
0
8
3.75–50
3.75–30
0
1
1
4
7.5–100
7.5–60
1
0
0
5
6–80
6–48
1
0
1
7
4–57
4–34
1
1
0
1
30–250
30–200
1
1
1
3
10–133
10–80
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USER CONFIGURABLE CLOCK
CLOCK MULTIPLIER
VDW + 8
RDW + 2 OD
External Components/Crystal
Selection
CLK Frequency = Input Frequency 2x ---------------------------------------------
Decoupling Capacitors
Where:
The ICS525-01/02 requries two 0.01µF decoupling
capacitors to be connected between VDD and GND,
one on each side of the chip. The capacitor must be
connected close to the device to minimize lead
inductance.
Reference Divider Word (RDW) = 0 to 127 (0 not
permitted for 525-01)
VCO Divider Word (VDW) = 0 to 511 (0, 1, 2, 3 not
permitted for 525-01)
External Resistors
Output Divider (OD) = values on pages 3-4
A 33series termination resistor should be used on the
CLK and REF pins.
Also, the following operating ranges should be
observed:
Crystal Load Capacitors
1. The output frequency must be in the ranges listed on
pages 3-4.
The approximate total on-chip capacitance for a crystal
is 16 pF, so a parallel resonant, fundamental mode
crystal with this value of load (correlation) capacitance
should be used. For crystals with a specified load
capacitance greater than 16 pF, crystal capacitors may
be connected from each of the pins X1 and X2 to
Ground as shown in the block diagram. The value (in
pF) of these crystal caps should be (CL -16)*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).
2. The phase detector frequency must be above 200
kHz.
InputFrequency
200kHz < ---------------------------------------------- RDW + 2
Since all of the inputs have pull-up resistors, it is only
necessary to ground the pins that need to be set to
zero.
Determining the Output Frequency
Which Part to Use?
Users have full control in setting the desired output
frequency over the range shown in the tables on pages
3-4. To replace a standard oscillator, users should
connect the divider select input pins directly to ground
(or VDD, although this is not required because of
internal pull-ups) during Printed Circuit Board layout.
The 525 will automatically produce the correct
frequency when all components are soldered. It is also
possible to connect the inputs to parallel I/O ports to
switch frequencies. By choosing divides carefully, the
number of inputs which need to be changed can be
minimized. Observe the restrictions on allowed values
of VDW and RDW.
The 525-01 is the original configurable clock.
The 525-02 has a higher maximum output frequency
and a slightly different set of output dividers.
To determine the best combination of VCO, reference,
and output divide, use the Calculator on our web site.
Configuration Pin Settings
The output of the 525 can be determined by the
following simple equation:
© 2021 Renesas Electronics Corporation
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USER CONFIGURABLE CLOCK
CLOCK MULTIPLIER
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS525-01/02. 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, Commercial
0 to +70C
Ambient Operating Temperature, Industrial
-40 to +85C
Storage Temperature
-65C to 150C
Junction Temperature
125C
Soldering Temperature
260C (max. of 10 seconds)
DC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units
5.5
V
Operating Voltage
VDD
Operating Supply Current
IDD
60 MHz out, no load,
15 MHz crystal,
525-01/02 only
8
mA
Operating Supply Current,
Power-down
IDD
Pin 19 = 0, Note 1
4
µA
Input High Voltage
VIH
Input Low Voltage
VIL
Input High Voltage,
X1/ICLK only
VIH
ICLK (pin7)
Input Low Voltage, X1/ICLK
only
VIL
ICLK (pin7)
Output High Voltage
VOH
IOH = -12 mA
Output Low Voltage
VOL
IOL = 12 mA
Short Circuit Current
3.0
2
V
0.8
VDD/2+1
V
VDD/2
VDD/2
V
VDD/2-1
V
V
VDD-0.4
0.4
V
CLK and REF outputs
±55
mA
Input Capacitance
CIN
V, R, S pins and pin 19
4
pF
On-chip Pull-up Resistor
RPU
V, R, S pins and pin 19
270
k
© 2021 Renesas Electronics Corporation
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USER CONFIGURABLE CLOCK
CLOCK MULTIPLIER
AC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V
Parameter
Input Frequency
Symbol
FIN
Conditions
Min.
Typ.
Max.
Units
Crystal input
5
27
MHz
Clock input
2
50
MHz
Output Clock Rise Time
0.8 to 2.0 V
1
ns
Output Clock Fall Time
2.0 to 0.8 V
1
ns
Output Clock Duty Cycle, OD =
2, 4, 6, 8, or 10
At VDD/2
45
Output Clock Duty Cycle, OD =
3, 5, 7, or 9
At VDD/2
Output Clock Duty Cycle, OD =
1 (-02 only)
At VDD/2
49 to
51
55
%
40
60
%
35
65
Power-down Time, PD low to
clocks stopped
50
ns
Power-up Time, PD high to
clocks stable
10
ms
Absolute Clock Period Jitter,
525-01, Note 2
tja
Deviation from mean
One Sigma Clock Period Jitter,
525-01, Note 2
tjs
Absolute Clock Period Jitter,
525-02, Note 2
One Sigma Clock Period Jitter,
525-02, Note 2
±140
ps
One Sigma
45
ps
tja
Deviation from mean
±85
ps
tjs
One Sigma
30
ps
NOTE 1: Phase relationship between input and output can change at power-up. For a fixed phase
relationship, see the 527.
NOTE 2: For 16 MHz, 100 MHz output. Use the -02 for lowest jitter.
© 2021 Renesas Electronics Corporation
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USER CONFIGURABLE CLOCK
CLOCK MULTIPLIER
Package Outline Drawings
The package outline drawings are located at the end of this document and are accessible from the Renesas website
(see Ordering Information for POD links). The package information is the most current data available and is subject
to change without revision of this document.
Ordering Information
Part / Order Number
Marking
Shipping Packaging
Package
Temperature
525-01RLF
525-01RLFT
525-01RILF
525-01RILFT
525R-02LF
525R-02LFT
525R-02ILF
525R-02ILFT
525NQG-01
525NQG-01T
525NQG-01I
525NQG-01IT
525NQG-02
525NQG-02T
525NQG-02I
525NQG-02IT
ICS525-01RLF
ICS525-01RLF
ICS525-01RILF
ICS525-01RILF
ICS525R-02LF
ICS525R-02LF
ICS525R-02ILF
ICS525R-02ILF
525NQG-01
525NQG-01
525NQG-01I
525NQG-01I
525NQG-02
525NQG-02
525NQG-02I
525NQG-02I
Tubes
Tape and Reel
Tubes
Tape and Reel
Tubes
Tape and Reel
Tubes
Tape and Reel
Tubes
Tape and Reel
Tubes
Tape and Reel
Tubes
Tape and Reel
Tubes
Tape and Reel
28-pin SSOP
28-pin SSOP
28-pin SSOP
28-pin SSOP
28-pin SSOP
28-pin SSOP
28-pin SSOP
28-pin SSOP
28-pin VFQFPN
28-pin VFQFPN
28-pin VFQFPN
28-pin VFQFPN
28-pin VFQFPN
28-pin VFQFPN
28-pin VFQFPN
28-pin VFQFPN
0 to +70C
0 to +70C
-40 to +85C
-40 to +85C
0 to +70C
0 to +70C
-40 to +85C
-40 to +85C
0 to +70C
0 to +70C
-40 to +85C
-40 to +85C
0 to +70C
0 to +70C
-40 to +85C
-40 to +85C
Revision History
Rev. March 30, 2015
1. removed -11 and -12 references/parts from datasheet. The devices are obsolete.
2. Added VFQFPN packaging note to Features.
3. Updated POD with latest drawing
4. Updated Ordering Information.
Rev. August 23, 2021
1. Rebranded to Renesas.
2. Updated “Which Part to Use?” section to include updated link to calculators page.
3. Updated Package Outline Drawings section and Ordering Information table.
© 2021 Renesas Electronics Corporation
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