• Phase-Lock Loop Clock Distribution for Applications ranging
from 10MHz to 133MHz operating frequency
• Distributes one clock input to two banks of four outputs
• Separate output enable for each output bank
• External feedback (FBK) pin is used to synchronize the outputs
to the clock input
• Output Skew <200 ps
• Low jitter <200 ps cycle-to-cycle
• 1x, 2x, 4x output options (see table):
– IDT23S08-1 1x
– IDT23S08-2 1x, 2x
– IDT23S08-3 2x, 4x
– IDT23S08-4 2x
– IDT23S08-1H, -2H, and -5H for High Drive
• No external RC network required
• Operates at 3.3V V
DD
• Spread spectrum compatible
• Available in SOIC and TSSOP packages
The IDT23S08 is a high-speed phase-lock loop (PLL) clock multiplier. It is
designed to address high-speed clock distribution and multiplication applica-
tions. The zero delay is achieved by aligning the phase between the incoming
clock and the output clock, operable within the range of 10 to 133MHz.
The IDT23S08 has two banks of four outputs each that are controlled via two
select addresses. By proper selection of input addresses, both banks can be
put in tri-state mode. In test mode, the PLL is turned off, and the input clock
directly drives the outputs for system testing purposes. In the absence of an
input clock, the IDT23S08 enters power down. In this mode, the device will
draw less than 12µA for Commercial Temperature range and less than 25µA
for Industrial temperature range, and the outputs are tri-stated.
The IDT23S08 is available in six unique configurations for both pre-
scaling and multiplication of the Input REF Clock. (See available options
table.)
The PLL is closed externally to provide more flexibility by allowing the user
to control the delay between the input clock and the outputs.
The IDT23S08 is characterized for both Industrial and Commercial opera-
tion.
FUNCTIONAL BLOCK DIAGRAM
(-3, -4)
FBK
REF
16
1
2
(-5)
2
PLL
3
2
CLKA1
CLKA2
14
CLKA3
15
CLKA4
S2
S1
8
9
Control
Logic
(-2, -3)
2
6
CLKB1
7
CLKB2
10
CLKB3
11
CLKB4
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
1
c
2003
Integrated Device Technology, Inc.
OCTOBER 2003
DSC 6394/8
IDT23S08
3.3V ZERO DELAY CLOCK MULTIPLIER
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
DD
Rating
Supply Voltage Range
Input Voltage Range (REF)
Input Voltage Range
(except REF)
I
IK
(V
I
< 0)
I
O
(V
O
= 0 to V
DD
)
V
DD
or GND
T
A
= 55°C
(in still air)
(3)
T
STG
Operating
Temperature
Operating
Storage Temperature Range
Commercial Temperature
Range
Industrial Temperature
Range
-40 to +85
°C
–65 to +150
0 to +70
°C
°C
Continuous Current
Maximum Power Dissipation
±100
0.7
mA
W
Input Clamp Current
Continuous Output Current
Max.
–0.5 to +4.6
–0.5 to +5.5
–0.5 to
V
DD
+0.5
–50
±50
mA
mA
Unit
V
V
V
V
I (2)
V
I
REF
CLKA1
CLKA2
V
DD
GND
CLKB1
CLKB2
S2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
FBK
CLKA4
CLKA3
V
DD
GND
CLKB4
CLKB3
S1
SOIC/ TSSOP
TOP VIEW
Temperature
PIN DESCRIPTION
Pin Number
REF
(1)
CLKA1
(2)
CLKA2
(2)
V
DD
GND
CLKB1
(2)
CLKB2
(2)
S2
(3)
NOTES:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may
cause permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those indicated in the
operational sections of this specification is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect reliability.
2. The input and output negative-voltage ratings may be exceeded if the input and output
clamp-current ratings are observed.
3. The maximum package power dissipation is calculated using a junction temperature
of 150
°
C and a board trace length of 750 mils.
Functional Description
Input Reference Clock, 5 Volt Tolerant Input
Clock Output for Bank A
Clock Output for Bank A
3.3V Supply
Ground
Clock Output for Bank B
Clock Output for Bank B
Select Input, Bit 2
Select Input, Bit 1
Clock Output for Bank B
Clock Output for Bank B
Ground
3.3V Supply
Clock Output for Bank A
Clock Output for Bank A
PLL Feedback Input
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
APPLICATIONS:
•
•
•
•
•
S1
(3)
CLKB3
(2)
CLKB4
(2)
GND
V
DD
CLKA3
(2)
CLKA4
(2)
FBK
SDRAM
Telecom
Datacom
PC Motherboards/Workstations
Critical Path Delay Designs
NOTES:
1. Weak pull down.
2. Weak pull down on all outputs.
3. Weak pull ups on these inputs.
2
IDT23S08
3.3V ZERO DELAY CLOCK MULTIPLIER
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
FUNCTION TABLE
(1)
SELECT INPUT DECODING
S2
L
L
H
H
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
S1
L
H
L
H
CLK A
Tri-State
Driven
Driven
Driven
CLK B
Tri-State
Tri-State
Driven
Driven
Output Source
PLL
PLL
REF
PLL
PLL Shut Down
Y
N
Y
N
AVAILABLE OPTIONS FOR IDT23S08
Device
IDT23S08-1
IDT23S08-1H
IDT23S08-2
IDT23S08-2
IDT23S08-2H
(1)
IDT23S08-2H
(1)
IDT23S08-3
(1)
IDT23S08-3
(1)
IDT23S08-4
IDT23S08-5H
Feedback From
Bank A or Bank B
Bank A or Bank B
Bank A
Bank B
Bank A
Bank B
Bank A
Bank B
Bank A or Bank B
Bank A or Bank B
Bank A Frequency
Reference
Reference
Reference
2 x Reference
Reference
2 x Reference
2 x Reference
4 x Reference
2 x Reference
Reference/2
Bank B Frequency
Reference
Reference
Reference/2
Reference
Reference/2
Reference
Reference or
Reference
(2)
2 x Reference
2 x Reference
Reference/2
NOTES:
1. Contact factory for availability.
2. Output phase is indeterminant (0° or 180° from input clock).
SPREAD SPECTRUM COMPATIBLE
Many systems being designed now use a technology called Spread Spectrum Frequency Timing Generation. This product is designed not to filter
off the Spread Spectrum feature of the reference input, assuming it exists. When a zero delay buffer is not designed to pass the Spread Spectrum feature
through, the result is a significant amount of tracking skew, which may cause problems in systems requiring synchronization.
3
IDT23S08
3.3V ZERO DELAY CLOCK MULTIPLIER
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
ZERO DELAY AND SKEW CONTROL
To close the feedback loop of the IDT23S08, the FBK pin can be driven from any of the eight available output pins. The output driving the FBK pin
will be driving a total load of 7pF plus any additional load that it drives. The relative loading of this output (with respect to the remaining outputs) can adjust
the input-output delay.
For applications requiring zero input-output delay, all outputs including the one providing feedback should be equally loaded. Ensure the outputs are
loaded equally, for zero output-output skew.
OPERATING CONDITIONS- COMMERCIAL
Symbol
V
DD
T
A
C
L
C
IN
Supply Voltage
Operating Temperature (Ambient Temperature)
Load Capacitance below 100MHz
Load Capacitance from 100MHz to 133MHz
Input Capacitance
(1)
NOTE:
1. Applies to both REF and FBK.
Parameter
Test Conditions
Min.
3
0
—
—
—
Max.
3.6
70
30
15
7
Unit
V
°
C
pF
pF
pF
DC ELECTRICAL CHARACTERISTICS - COMMERCIAL
Symbol
V
IL
V
IH
I
IL
I
IH
V
OL
V
OH
I
DD_PD
Parameter
Input LOW Voltage Level
Input HIGH Voltage Level
Input LOW Current
Input HIGH Current
Output LOW Voltage
Output HIGH Voltage
Power Down Current
V
IN
= 0V
V
IN
= V
DD
I
OL
= 8mA (-1, -2, -3, -4)
I
OL
= 12mA (-1H, -2H, -5H)
I
OH
= -8mA (-1, -2, -3, -4)
I
OH
= -12mA (-1H, -2H, -5H)
REF = 0MHz (S2 = S1 = H)
100MHz CLKA (-1, -2, -3, -4)
100MHz CLKA (-1H, -2H, -5H)
I
DD
Supply Current
Unloaded Outputs
Select Inputs at V
DD
or GND
66MHz CLKA (-1, -2, -3, -4)
66MHz CLKA (-1H, -2H, -5H)
33MHz CLKA (-1, -2, -3, -4)
33MHz CLKA (-1H, -2H, -5H)
—
—
—
—
—
—
—
—
—
—
—
—
—
—
12
45
70
32
50
18
30
mA
µA
2.4
—
—
V
Conditions
Min.
—
2
—
—
—
Typ.
(1)
—
—
—
—
—
Max.
0.8
—
50
100
0.4
Unit
V
V
µA
µA
V
4
IDT23S08
3.3V ZERO DELAY CLOCK MULTIPLIER
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
SWITCHING CHARACTERISTICS - COMMERCIAL
Symbol
t
1
t
1
t
1
Parameter
Output Frequency
Output Frequency
Output Frequency
Duty Cycle = t
2
÷
t
1
(-1, -2, -3, -4, -1H, -2H, -5H)
Duty Cycle = t
2
÷
t
1
(-1, -2, -3, -4, -1H, -2H, -5H)
t
3
t
3
t
3
t
4
t
4
t
4
t
5
Rise Time (-1, -2, -3, -4)
Rise Time (-1, -2, -3, -4)
Rise Time (-1H, -2H, -5H)
Fall Time (-1, -2, -3, -4)
Fall Time (-1, -2, -3, -4)
Fall Time (-1H, -5H)
Output to Output Skew on same Bank
(-1, -2, -3, -4)
Output to Output Skew (-1H, -2H, -5H)
Output Bank A to Output Bank B (-1, -4, -2H, -5H)
Output Bank A to Output Bank B Skew (-2, -3)
t
6
t
7
t
8
t
J
Delay, REF Rising Edge to FBK Rising Edge
Device to Device Skew
Output Slew Rate
Cycle to Cycle Jitter
(-1, -1H, -4, -5H)
tJ
Conditions
30pF Load, all devices
20pF Load, -1H, -2H, -5H Devices
(1)
15pF Load, -1, -2, -3, -4 devices
Measured at 1.4V, F
OUT
= 66.66MHz
30pF Load
Measured at 1.4V, F
OUT
= 50MHz
15pF Load
Measured between 0.8V and 2V, 30pF Load
Measured between 0.8V and 2V, 15pF Load
Measured between 0.8V and 2V, 30pF Load
Measured between 0.8V and 2V, 30pF Load
Measured between 0.8V and 2V, 15pF Load
Measured between 0.8V and 2V, 30pF Load
All outputs equally loaded
All outputs equally loaded
All outputs equally loaded
All outputs equally loaded
Measured at V
DD
/2
Measured at V
DD
/2 on the FBK pins of devices
Measured between 0.8V and 2V on -1H, -2H, -5H
device using Test Circuit 2
Measured at 66.67 MHz, loaded outputs, 15pF Load
Measured at 66.67 MHz, loaded outputs, 30pF Load
Measured at 133.3 MHz, loaded outputs, 15pF Load
Measured at 66.67 MHz, loaded outputs, 30pF Load
Measured at 66.67 MHz, loaded outputs, 15pF Load
Stable Power Supply, valid clocks presented
on REF and FBK pins
Min.
10
10
10
40
45
—
—
—
—
—
—
—
—
—
—
—
—
1
—
—
—
—
—
—
Typ.
—
—
—
50
50
—
—
—
—
—
—
—
—
—
—
0
0
—
—
—
—
—
—
—
Max.
100
133.3
133.3
60
55
2.2
1.5
1.5
2.2
1.5
1.25
200
200
200
400
±250
700
—
200
200
100
400
400
1
Unit
MHz
MHz
MHz
%
%
ns
ns
ns
ns
ns
ns
ps
ps
ps
ps
ps
ps
V/ns
ps
ps
ms
Cycle to Cycle Jitter
(-2, -2H, -3)
PLL Lock Time
t
LOCK
NOTE:
1. IDT23S08-5H has maximum input frequency of 133.33 MHz and maximum output of 66.67MHz.
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