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IDT2308A
3.3V ZERO DELAY CLOCK MULTIPLIER
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
3.3V ZERO DELAY CLOCK
MULTIPLIER
FEA TURES:
• 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):
– IDT2308A-1 1x
– IDT2308A-2 1x, 2x
– IDT2308A-3 2x, 4x
– IDT2308A-4 2x
– IDT2308A-1H and -2H for High Drive
• No external RC network required
• Operates at 3.3V VDD
• Available in SOIC and TSSOP packages
IDT2308A
DESCRIPTION:
The IDT2308A is a high-speed phase-lock loop (PLL) clock multiplier. It is
designed to address high-speed clock distribution and multiplication applications. 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 IDT2308A 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 IDT2308A 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 IDT2308A is available in six unique configurations for both prescaling 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 IDT2308A is characterized for both Industrial and Commercial opera-
tion.
FUNCTIONAL BLOCK DIAGRAM
(-3, -4)
16
FBK
REF
S2
S1
2
1
8
9
PLL
Control
Logic
(-2, -3)
2
CLKA1
3
CLKA2
14
CLKA3
15
CLKA4
2
6
CLKB1
7
CLKB2
10
CLKB3
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
2004 Integrated Device Technology, Inc. DSC 6587/8c
1
11
CLKB4
JULY 2004
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IDT2308A
3.3V ZERO DELAY CLOCK MULTIPLIER
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
PIN CONFIGURATION
REF
CLKA1
CLKA2
VDD
GND
CLKB1
CLKB2
S2
2
3
4
5
6
7
8
SOIC/ TSSOP
TOP VIEW
PIN DESCRIPTION
Pin Number Functional Description
(1)
REF
(2)
CLKA1
(2)
CLKA2
VDD 4 3.3V Supply
GND 5 Ground
(2)
CLKB1
(2)
CLKB2
(3)
S2
(3)
S1
(2)
CLKB3
(2)
CLKB4
GND 12 Ground
VDD 13 3.3V Supply
(2)
CLKA3
(2)
CLKA4
FBK 16 PLL Feedback Input
1 Input Reference Clock, 5 Volt Tolerant Input
2 Clock Output for Bank A
3 Clock Output for Bank A
6 Clock Output for Bank B
7 Clock Output for Bank B
8 Select Input, Bit 2
9 Select Input, Bit 1
1 0 Clock Output for Bank B
1 1 Clock Output for Bank B
1 4 Clock Output for Bank A
1 5 Clock Output for Bank A
161
15
14
13
12
11
10
ABSOLUTE MAXIMUM RATINGS
Symbol Rating Max. Unit
VDD Supply Voltage Range –0.5 to +4.6 V
(2)
FBK
VI
V
I Input Voltage Range –0.5 to V
CLKA4
CLKA3
DD
V
GND
CLKB4
CLKB3
9
S1
IIK (VI < 0) Input Clamp Current –5 0 mA
IO Continuous Output Current ±50 mA
(VO = 0 to VDD)
VDD or GND Continuous Current ±100 mA
TA = 55°C Maximum Power Dissipation 0.7 W
(in still air)
TSTG Storage Temperature Range –65 to +150 °C
Operating Commercial Temperature 0 to +70 °C
Temperature Range
Operating Industrial Temperature -40 to +85 °C
Temperature Range
NOTES:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may
2. The input and output negative-voltage ratings may be exceeded if the input and output
3. The maximum package power dissipation is calculated using a junction temperature
(3)
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.
clamp-current ratings are observed.
of 150°C and a board trace length of 750 mils.
Input Voltage Range (REF) –0.5 to +5.5 V
(except REF) VDD+0.5
(1)
APPLICATIONS:
• 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.
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IDT2308A
3.3V ZERO DELAY CLOCK MULTIPLIER
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
FUNCTION TABLE
S2 S1 CLK A CLK B Output Source PLL Shut Down
L L Tri-State Tri-State PLL Y
L H Driven Tri-State PLL N
H L Driven Driven REF Y
H H Driven Driven PLL N
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
(1)
SELECT INPUT DECODING
AVAILABLE OPTIONS FOR IDT2308A
Device Feedback From Bank A Frequency Bank B Frequency
IDT2308A-1 Bank A or Bank B Reference Reference
IDT2308A-1H Bank A or Bank B Reference Reference
IDT2308A-2 Bank A Reference Reference/2
IDT2308A-2 Bank B 2 x Reference Reference
IDT2308A-2H Bank A Reference Reference/2
IDT2308A-2H Bank B 2 x Reference Reference
IDT2308A-3 Bank A 2 x Reference Reference or Reference
IDT2308A-3 Bank B 4 x Reference 2 x Reference
IDT2308A-4 Bank A or Bank B 2 x Reference 2 x Reference
NOTE:
1. Output phase is indeterminant (0° or 180° from input clock).
(1)
ZERO DELA Y AND SKEW CONTROL
To close the feedback loop of the IDT2308A, 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.
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IDT2308A
3.3V ZERO DELAY CLOCK MULTIPLIER
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
OPERATING CONDITIONS- COMMERCIAL
Symbol Parameter Test Conditions Min. Max. Unit
VDD Supply Voltage 3 3.6 V
TA Operating Temperature (Ambient Temperature) 0 7 0 °C
CL Load Capacitance below 100MHz — 3 0 pF
Load Capacitance from 100MHz to 133MHz — 1 5 pF
CIN Input Capacitance
NOTE:
1. Applies to both REF and FBK.
(1)
—7pF
DC ELECTRICAL CHARACTERISTICS - COMMERCIAL
Symbol Parameter Conditions Min. Typ.
VIL Input LOW Voltage Level — — 0.8 V
VIH Input HIGH Voltage Level 2 — — V
IIL Input LOW Current VIN = 0V — — 50 µA
IIH Input HIGH Current VIN = VDD — — 100 µA
VOL Output LOW Voltage IOL = 8mA (-1, -2, -3, -4) — — 0.4 V
IOL = 12mA (-1H, -2H)
VOH Output HIGH Voltage IOH = -8mA (-1, -2, -3, -4) 2.4 — — V
IOH = -12mA (-1H, -2H)
IDD_PD Power Down Current REF = 0MHz (S2 = S1 = H) — — 12 µA
100MHz CLKA (-1, -2, -3, -4) — — 45
100MHz CLKA (-1H, -2H) — — 70
IDD Supply Current Unloaded Outputs 66MHz CLKA (-1, -2, -3, -4) — — 32 mA
Select Inputs at VDD or GND 66MHz CLKA (-1H, -2H) — — 50
33MHz CLKA (-1, -2, -3, -4) — — 18
33MHz CLKA (-1H, -2H) — — 30
(1)
Max. Unit
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IDT2308A
3.3V ZERO DELAY CLOCK MULTIPLIER
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
SWITCHING CHARACTERISTICS - COMMERCIAL
Symbol Parameter Conditions Min. Typ. Max. Unit
t1 Output Frequency 30pF Load, all devices 1 0 — 100 MHz
t1 Output Frequency 20pF Load, -1H, -2H Devices 10 — 133.3 MHz
t1 Output Frequency 15pF Load, -1, -2, -3, -4 devices 1 0 — 133.3 MHz
Duty Cycle = t
(-1, -2, -3, -4, -1H, -2H) 30pF Load
Duty Cycle = t
(-1, -2, -3, -4, -1H, -2H) 15pF Load
t3 Rise Time (-1, -2, -3, -4) Measured between 0.8V and 2V, 30pF Load — — 2.2 ns
t3 Rise Time (-1, -2, -3, -4) Measured between 0.8V and 2V, 15pF Load — — 1.5 ns
t3 Rise Time (-1H, -2H) Measured between 0.8V and 2V, 30pF Load — — 1.5 ns
t4 Fall Time (-1, -2, -3, -4) Measured between 0.8V and 2V, 30pF Load — — 2.2 n s
t4 Fall Time (-1, -2, -3, -4) Measured between 0.8V and 2V, 15pF Load — — 1.5 n s
t4 Fall Time (-1H) Measured between 0.8V and 2V, 30pF Load — — 1.25 ns
t5 Output to Output Skew on same Bank All outputs equally loaded — — 20 0 ps
(-1, -2, -3, -4)
Output to Output Skew (-1H, -2H) All outputs equally loaded — — 20 0 p s
Output Bank A to Output Bank B (-1, -4, -2H) All outputs equally loaded — — 20 0 p s
Output Bank A to Output Bank B Skew (-2, -3) All outputs equally loaded — — 400 ps
t6 Delay, REF Rising Edge to FBK Rising Edge Measured at VDD/2 — 0 ±25 0 ps
t7 Device to Device Skew Measured at VDD/2 on the FBK pins of devices — 0 70 0 ps
t8 Output Slew Rate Measured between 0.8V and 2V on -1H, -2H 1 — — V/ns
tJ Cycle to Cycle Jitter Measured at 66.67 MHz, loaded outputs, 15pF Load — — 20 0
(-1, -1H, -4) Measured at 66.67 MHz, loaded outputs, 30pF Load — — 20 0 ps
tJ Cycle to Cycle Jitter Measured at 66.67 MHz, loaded outputs, 30pF Load — — 40 0 ps
(-2, -2H, -3) Measured at 66.67 MHz, loaded outputs, 15pF Load — — 40 0
tLOCK PLL Lock Time Stable Power Supply, valid clocks presented — — 1 ms
2 ÷ t1 Measured at 1.4V, FOUT = 66.66MHz 40 50 60 %
2 ÷ t1 Measured at 1.4V, FOUT = 50MHz 45 50 55 %
device using Test Circuit 2
Measured at 133.3 MHz, loaded outputs, 15pF Load — — 10 0
on REF and FBK pins
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IDT2308A
3.3V ZERO DELAY CLOCK MULTIPLIER
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
OPERATING CONDITIONS- INDUSTRIAL
Symbol Parameter Test Conditions Min. Max. Unit
VDD Supply Voltage 3 3.6 V
TA Operating Temperature (Ambient Temperature) -40 +85 ° C
CL Load Capacitance below 100MHz — 3 0 pF
Load Capacitance from 100MHz to 133MHz — 1 5 pF
CIN Input Capacitance
NOTE:
1. Applies to both REF and FBK.
(1)
—7pF
DC ELECTRICAL CHARACTERISTICS - INDUSTRIAL
Symbol Parameter Conditions Min. Typ.
VIL Input LOW Voltage Level — — 0 .8 V
VIH Input HIGH Voltage Level 2 — — V
IIL Input LOW Current VIN = 0V — — 50 µA
IIH Input HIGH Current VIN = VDD — — 100 µA
VOL Output LOW Voltage IOL = 8mA (-1, -2, -3, -4) — — 0 .4 V
IOL = 12mA (-1H, -2H)
VOH Output HIGH Voltage IOH = -8mA (-1, -2, -3, -4) 2.4 — — V
IOH = -12mA (-1H, -2H)
IDD_PD Power Down Current REF = 0MHz (S2 = S1 = H) — — 25 µ A
100MHz CLKA (-1, -2, -3, -4) — — 45
100MHz CLKA (-1H, -2H) — — 70
IDD Supply Current Unloaded Outputs 66MHz CLKA (-1, -2, -3, -4) — — 32 m A
Select Inputs at VDD or GND 66MHz CLKA (-1H, -2H) — — 50
33MHz CLKA (-1, -2, -3, -4) — — 18
33MHz CLKA (-1H, -2H) — — 30
(1)
Max. Unit
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IDT2308A
3.3V ZERO DELAY CLOCK MULTIPLIER
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
SWITCHING CHARACTERISTICS - INDUSTRIAL
Symbol Parameter Conditions Min. Typ. Max. Unit
t1 Output Frequency 30pF Load, all devices 1 0 ⎯ 100 MHz
t1 Output Frequency 20pF Load, -1H, -2H Devices 10 ⎯ 133.3 MHz
t1 Output Frequency 15pF Load, -1, -2, -3, -4 devices 1 0 ⎯ 133.3 MHz
Duty Cycle = t2 ÷ t1 Measured at 1.4V, FOUT = 66.66MHz 40 50 60 %
(-1, -2, -3, -4, -1H, -2H) 30pF Load
Duty Cycle = t
(-1, -2, -3, -4, -1H, -2H) 15pF Load
t3 Rise Time (-1, -2, -3, -4) Measured between 0.8V and 2V, 30pF Load ⎯⎯2.2 ns
t3 Rise Time (-1, -2, -3, -4) Measured between 0.8V and 2V, 15pF Load ⎯⎯1.5 ns
t3 Rise Time (-1H, -2H) Measured between 0.8V and 2V, 30pF Load ⎯⎯1.5 ns
t4 Fall Time (-1, -2, -3, -4) Measured between 0.8V and 2V, 30pF Load ⎯⎯2.2 ns
t4 Fall Time (-1, -2, -3, -4) Measured between 0.8V and 2V, 15pF Load ⎯⎯1.5 ns
t4 Fall Time (-1H) Measured between 0.8V and 2V, 30pF Load ⎯⎯1.25 ns
t5 Output to Output Skew on same Bank All outputs equally loaded ⎯⎯200 ps
(-1, -2, -3, -4)
Output to Output Skew (-1H, -2H) All outputs equally loaded ⎯⎯200 ps
Output Bank A to Output Bank B (-1, -4, -2H) All outputs equally loaded ⎯⎯200 ps
Output Bank A to Output Bank B Skew (-2, -3) All outputs equally loaded ⎯⎯400 ps
t6 Delay, REF Rising Edge to FBK Rising Edge Measured at VDD/2 ⎯ 0±250ps
t7 Device to Device Skew Measured at VDD/2 on the FBK pins of devices ⎯ 0 700 ps
t8 Output Slew Rate Measured between 0.8V and 2V on -1H, -2H 1 ⎯⎯V/ns
tJ Cycle to Cycle Jitter Measured at 66.67 MHz, loaded outputs, 15pF Load ⎯⎯200
(-1, -1H, -4) Measured at 66.67 MHz, loaded outputs, 30pF Load ⎯⎯200 ps
tJ Cycle to Cycle Jitter Measured at 66.67 MHz, loaded outputs, 30pF Load ⎯⎯400 ps
(-2, -2H, -3) Measured at 66.67 MHz, loaded outputs, 15pF Load ⎯⎯400
tLOCK PLL Lock Time Stable Power Supply, valid clocks presented ⎯⎯1ms
2 ÷ t1 Measured at 1.4V, FOUT = 50MHz 45 50 55 %
device using Test Circuit 2
Measured at 133.3 MHz, loaded outputs, 15pF Load ⎯⎯100
on REF and FBK pins
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IDT2308A
3.3V ZERO DELAY CLOCK MULTIPLIER
SWITCHING WAVEFORMS
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
t1
t2
Output
1.4V
0.8V
t3
Duty Cycle Timing
2V
2V
All Outputs Rise/Fall Time
Output
Output
1.4V
t5
1.4V 1.4V
0.8V
t4
1.4V
3.3V
0V
Input
FBK
FBK,
Device 1
FBK,
Device 2
Output to Output Skew
VDD/2
VDD/2
t6
Input to Output Propagation Delay
V
DD/2
V
t7
DD/2
Device to Device Skew
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IDT2308A
3.3V ZERO DELAY CLOCK MULTIPLIER
TEST CIRCUITS
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
0.1µF
0.1µF
TEST CIRCUIT 1
VDD
DD
V
OUTPUTS
CLK
OUT
C
LOAD
GND GND
Test Circuit for all Parameters Except t8
TEST CIRCUIT 2
0.1µF
VDD
OUTPUTS
1KΩ
1KΩ
DD
V
0.1µF
GND
GND
Test Circuit for t8, Output Slew Rate On -1H and -2H Devices
CLK
OUT
10pF
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IDT2308A
3.3V ZERO DELAY CLOCK MULTIPLIER
ORDERING INFORMATION
XXXXX XX X
IDT
Device Type
Package Process
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
Blank
I
DC
DCG
PG
PGG
2308A-1
2308A-2
2308A-3
2308A-4
2308A-1H
2308A-2H
Ordering Code Package Type Operating Range
IDT2308A-1DC 16-Pin SOIC Commercial
IDT2308A-1DCG 16-Pin SOIC Commercial
IDT2308A-1DCGI 16-Pin SOIC Industrial
IDT2308A-1DCI 16-Pin SOIC Industrial
IDT2308A-1HDC 16-Pin SOIC Commercial
IDT2308A-1HDCG 16-Pin SOIC Commercial
IDT2308A-1HDCGI 16-Pin SOIC Industrial
IDT2308A-1HDCI 16-Pin SOIC Industrial
IDT2308A-1HPG 16-Pin TSSOP Commercial
IDT2308A-1HPGG 16-Pin TSSOP Commercial
IDT2308A-1HPGGI 16-Pin TSSOP Industrial
IDT2308A-1HPGI 16-Pin TSSOP Industrial
IDT2308A-2DC 16-Pin SOIC Commercial
IDT2308A-2DCG 16-Pin SOIC Commercial
IDT2308A-2DCGI 16-Pin SOIC Industrial
IDT2308A-2DCI 16-Pin SOIC Industrial
IDT2308A-2HDC 16-Pin SOIC Commercial
IDT2308A-2HDCI 16-Pin SOIC Industrial
IDT2308A-3DC 16-Pin SOIC Commercial
IDT2308A-3DCG 16-Pin SOIC Commercial
IDT2308A-3DCGI 16-Pin SOIC Industrial
IDT2308A-3DCI 16-Pin SOIC Industrial
IDT2308A-4DC 16-Pin SOIC Commercial
IDT2308A-4DCI 16-Pin SOIC Industrial
Commercial (0oC to +70oC)
Industrial (-40
Small Outline
SOIC - Green
Thin Shrink Small Outline Package
TSSOP - Green
Zero Delay Clock Buffer with Standard Drive
}
Zero Delay Clock Buffer with High Drive
}
o
C to +85oC)
CORPORATE HEADQUARTERS for SALES: for Tech Support:
2975 Stender Way 800-345-7015 or 408-727-6116 [email protected]
Santa Clara, CA 95054 fax: 408-492-8674 (408) 654-6459
www.idt.com
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