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COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
IDT23S05E
3.3V ZERO DELAY CLOCK BUFFER, SPREAD SPECTRUM
MAY 2010
2006 Integrated Device Technology, Inc. DSC - 6398/7c
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
FEATURES:
• Phase-Lock Loop Clock Distribution
• 10MHz to 200MHz operating frequency
• Distributes one clock input to one bank of five outputs
• Zero Input-Output Delay
• Output Skew < 250ps
• Low jitter <200 ps cycle-to-cycle
• IDT23S05E-1 for Standard Drive
• IDT23S05E-1H for High Drive
• No external RC network required
• Operates at 3.3V VDD
• Power down mode
• Spread spectrum compatible
• Available in SOIC package
FUNCTIONAL BLOCK DIAGRAM
IDT23S05E
3.3V ZERO DELAY CLOCK
BUFFER, SPREAD SPECTRUM
COMPATIBLE
PLL
8
CLK1
CLK2
CLK3
CLK4
Control
Logic
REF
CLKOUT
1
3
2
5
7
DESCRIPTION:
The IDT23S05E is a high-speed phase-lock loop (PLL) clock buffer,
designed to address high-speed clock distribution 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 200MHz.
The IDT23S05E is an 8-pin version of the IDT23S09E. IDT23S05E
accepts one reference input, and drives out five low skew clocks. The -1H
version of this device operates up to 200MHz frequency and has a higher
drive than the -1 device. All parts have on-chip PLLs which lock to an input
clock on the REF pin. The PLL feedback is on-chip and is obtained from the
CLKOUT pad. In the absence of an input clock, the IDT23S05E enters
power down. In this mode, the device will draw less than 12µA for
Commercial Temperature range and less than 25µA for Industrial tempera-
ture range, the outputs are tri-stated, and the PLL is not running, resulting
in a significant reduction of power.
The IDT23S05E is characterized for both Industrial and Commercial
operation.
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COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
IDT23S05E
3.3V ZERO DELAY CLOCK BUFFER, SPREAD SPECTRUM
REF
CLK1
2
3
4
8
7
6
5
1
CLK2
GND
CLKOUT
CLK4
VDD
CLK3
PIN CONFIGURATION
SOIC
TOP VIEW
Symbol Rating Max. Unit
VDD Supply Voltage Range –0.5 to +4.6 V
VI (2) Input Voltage Range (REF) –0.5 to +5.5 V
VIInput Voltage Range –0.5 to V
(except REF) VDD+0.5
IIK (VI < 0) Input Clamp Current –50 mA
IO (VO = 0 to VDD) Continuous Output Current ±50 mA
VDD or G N D Continuous Current ±100 mA
TA = 55°C Maximum Power Dissipation 0 .7 W
(in still air)(3)
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 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.
NOTES:
1. Weak pull down.
2. Weak pull down on all outputs.
PIN DESCRIPTION
ABSOLUTE MAXIMUM RATINGS(1)
APPLICATIONS:
• SDRAM
• Telecom
• Datacom
• PC Motherboards/Workstations
• Critical Path Delay Designs
Pin Name Pin Number Type Functional Description
REF(1) 1 IN Input reference clock, 5 Volt tolerant input
CLK2(2) 2 O ut Output clock
CLK1(2) 3 O ut Output clock
GND 4 Ground Ground
CLK3(2) 5 O ut Output clock
VDD 6 PWR 3.3V Supply
CLK4(2) 7 O ut Output clock
CLKOUT(2) 8 Out Output clock, internal feedback on this pin
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COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
IDT23S05E
3.3V ZERO DELAY CLOCK BUFFER, SPREAD SPECTRUM
Symbol Parameter Min. Max. Unit
VDD Supply Voltage 3 3.6 V
TAOperating Temperature (Ambient Temperature) 0 70 °C
CLLoad Capacitance < 100MHz — 3 0 pF
Load Capacitance 100MHz - 200MHz — 1 0
CIN Input Capacitance — 7 pF
OPERATING CONDITIONS - COMMERCIAL
DC ELECTRICAL CHARACTERISTICS - COMMERCIAL
Symbol Parameter Conditions Min. Max. Unit
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 Standard Drive IOL = 8mA — 0.4 V
High Drive IOL = 12mA (-1H)
VOH Output HIGH Voltage Standard Drive IOH = -8mA 2.4 — V
High Drive IOH = -12mA (-1H)
IDD_PD Power Down Current REF = 0MHz — 12 µA
IDD Supply Current Unloaded Outputs at 66.66MHz — 32 mA
SWITCHING CHARACTERISTICS (23S05E-1) - COMMERCIAL(1,2)
Symbol Parameter Conditions Min. Typ. Max. Unit
t1Output Frequency 10pF Load 10 — 200 MHz
30pF Load 10 — 100
Duty Cycle = t2 ÷ t1Measured at 1.4V, FOUT = 66.66MHz 40 50 60 %
t3Rise Time Measured between 0.8V and 2V — — 2.5 ns
t4Fall Time Measured between 0.8V and 2V — — 2.5 ns
t5Output to Output Skew All outputs equally loaded — — 250 ps
t6Delay, REF Rising Edge to CLKOUT Rising Edge Measured at VDD/2 — 0 ±350 ps
t7Device-to-Device Skew Measured at VDD/2 on the CLKOUT pins of devices — 0 7 0 0 p s
tJCycle-to-Cycle Jitter, pk - pk Measured at 66.66MHz, loaded outputs — — 200 ps
tLOCK PLL Lock Time Stable power supply, valid clock presented on REF pin — — 1 ms
NOTES:
1. REF Input has a threshold voltage of VDD/2.
2. All parameters specified with loaded outputs.
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COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
IDT23S05E
3.3V ZERO DELAY CLOCK BUFFER, SPREAD SPECTRUM
Symbol Parameter Min. Max. Unit
VDD Supply Voltage 3 3.6 V
TAOperating Temperature (Ambient Temperature) -40 +85 °C
CLLoad Capacitance < 100MHz — 3 0 pF
Load Capacitance 100MHz - 200MHz — 1 0
CIN Input Capacitance — 7 pF
OPERATING CONDITIONS - INDUSTRIAL
SWITCHING CHARACTERISTICS (23S05E-1H) - COMMERCIAL(1,2)
Symbol Parameter Conditions Min. Typ. Max. Unit
t1Output Frequency 10pF Load 10 — 200 MHz
30pF Load 10 — 100
Duty Cycle = t2 ÷ t1Measured at 1.4V, FOUT = 66.66MHz 40 50 60 %
Duty Cycle = t2 ÷ t1Measured at 1.4V, FOUT <50MHz 45 50 55 %
t3Rise Time Measured between 0.8V and 2V — — 1. 5 ns
t4Fall Time Measured between 0.8V and 2V — — 1. 5 ns
t5Output to Output Skew All outputs equally loaded — — 250 ps
t6Delay, REF Rising Edge to CLKOUT Rising Edge Measured at VDD/2 — 0 ±350 ps
t7Device-to-Device Skew Measured at VDD/2 on the CLKOUT pins of devices — 0 7 0 0 p s
t8Output Slew Rate Measured between 0.8V and 2V using Test Circuit #2 1 — — V/ns
tJCycle-to-Cycle Jitter, pk - pk Measured at 66.66MHz, loaded outputs — — 200 ps
tLOCK PLL Lock Time Stable power supply, valid clock presented on REF pin — — 1 ms
NOTES:
1. REF Input has a threshold voltage of VDD/2.
2. All parameters specified with loaded outputs.
DC ELECTRICAL CHARACTERISTICS - INDUSTRIAL
Symbol Parameter Conditions Min. Max. Unit
VIL Input LOW Voltage Level — 0.8 V
VIH Input HIGH Voltage Level 2 — V
IIL Input LOW Current VIN = 0V — 50 µ A
IIH Input HIGH Current VIN = VDD — 100 µA
VOL Output LOW Voltage Standard Drive IOL = 8mA — 0.4 V
High Drive IOL = 12mA (-1H)
VOH Output HIGH Voltage Standard Drive IOH = -8mA 2.4 — V
High Drive IOH = -12mA (-1H)
IDD_PD Power Down Current REF = 0MHz — 25 µA
IDD Supply Current Unloaded Outputs at 66.66MHz — 35 mA
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COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
IDT23S05E
3.3V ZERO DELAY CLOCK BUFFER, SPREAD SPECTRUM
SWITCHING CHARACTERISTICS (23S05E-1H) - INDUSTRIAL(1,2)
Symbol Parameter Conditions Min. Typ. Max. Unit
t1Output Frequency 10pF Load 10 — 200 MHz
30pF Load 10 — 100
Duty Cycle = t2 ÷ t1Measured at 1.4V, FOUT = 66.66MHz 40 50 60 %
Duty Cycle = t2 ÷ t1Measured at 1.4V, FOUT <50MHz 45 50 55 %
t3Rise Time Measured between 0.8V and 2V — — 1.5 ns
t4Fall Time Measured between 0.8V and 2V — — 1.5 ns
t5Output to Output Skew All outputs equally loaded — — 250 ps
t6Delay, REF Rising Edge to CLKOUT Rising Edge Measured at VDD/2 — 0 ±350 ps
t7Device-to-Device Skew Measured at VDD/2 on the CLKOUT pins of devices — 0 7 0 0 p s
t8Output Slew Rate Measured between 0.8V and 2V using Test Circuit #2 1 — — V/ns
tJCycle-to-Cycle Jitter, pk - pk Measured at 66.66MHz, loaded outputs — — 200 ps
tLOCK PLL Lock Time Stable power supply, valid clock presented on REF pin — — 1 ms
NOTES:
1. REF Input has a threshold voltage of VDD/2.
2. All parameters specified with loaded outputs.
SWITCHING CHARACTERISTICS (23S05E-1) - INDUSTRIAL(1,2)
Symbol Parameter Conditions Min. Typ. Max. Unit
t1Output Frequency 10pF Load 10 — 200 MHz
30pF Load 10 — 100
Duty Cycle = t2 ÷ t1Measured at 1.4V, FOUT = 66.66MHz 40 50 60 %
t3Rise Time Measured between 0.8V and 2V — — 2.5 ns
t4Fall Time Measured between 0.8V and 2V — — 2.5 ns
t5Output to Output Skew All outputs equally loaded — — 250 ps
t6Delay, REF Rising Edge to CLKOUT Rising Edge Measured at VDD/2 — 0 ±350 ps
t7Device-to-Device Skew Measured at VDD/2 on the CLKOUT pins of devices — 0 7 0 0 p s
tJCycle-to-Cycle Jitter, pk - pk Measured at 66.66MHz, loaded outputs — — 200 ps
tLOCK PLL Lock Time Stable power supply, valid clock presented on REF pin — — 1 ms
NOTES:
1. REF Input has a threshold voltage of VDD/2.
2. All parameters specified with loaded outputs.
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COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
IDT23S05E
3.3V ZERO DELAY CLOCK BUFFER, SPREAD SPECTRUM
ZERO DELA Y AND SKEW CONTROL
All outputs should be uniformly loaded in order to achieve Zero I/O Delay. Since the CLKOUT pin is the internal feedback for the PLL, its relative
loading can affect and adjust the input/output delay.
For designs utilizing zero I/O Delay, all outputs including CLKOUT must be equally loaded. Even if the output is not used, it must have a capacitive
load equal to that on the other outputs in order to obtain true zero I/O Delay. For zero output-to-output skew, all outputs must be loaded equally.
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.
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COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
IDT23S05E
3.3V ZERO DELAY CLOCK BUFFER, SPREAD SPECTRUM
VDD
OUTPUTS
VDD
GND GND
0.1 F
0.1 F
VDD
OUTPUTS
10pF
VDD
GND GND
0.1 F
0.1 F
1K
1K
CLOAD
CLKOUT CLKOUT
Output 1.4V
1.4V
t5
Output
REF VDD/2
t6
Output
CLKOUT
Device 1
t7
CLKOUT
Device 2
VDD/2
VDD/2
VDD/2
1.4V
1.4V
t2
t1
1.4V
2V
0.8V
t3 t4
0.8V 3.3V
0V
2V
Output
All Outputs Rise/Fall Time Input to Output Propagation Delay
Device to Device Skew
Output to Output Skew
Duty Cycle Timing
SWITCHING WAVEFORMS
Test Circuit 1 (all Parameters Except t8) Test Circuit 2 (t8, Output Slew Rate On -1H Devices)
TEST CIRCUITS
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COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
IDT23S05E
3.3V ZERO DELAY CLOCK BUFFER, SPREAD SPECTRUM
ORDERING INFORMATION
IDT XXXXX XX X
Package Process
Device Type
23S05E-1
23S05E-1H
Zero Delay Clock Buffer with High Drive Output,
Spread Spectrum Compatible
DC
DCG
Small Outline
SOIC - Green
Blank
I
Commercial (0oC to +70oC)
Industrial (-40oC to +85oC)
CORPORATE HEADQUARTERS for SALES: for Tech Support:
6024 Silver Creek Valley Road 800-345-7015 or 408-284-8200 clockhelp@idt.com
San Jose, CA 95138 fax: 408-284-2775
www.idt.com
Part / Order Number Shipping Packaging Package Temperature
23S05E-1DCG Tubes 8-pin SOIC 0° to +70° C
23S05E-1DCG8 Tape and Reel 8-pin SOIC 0° to +70° C
23S05E-1DCGI Tubes 8-pin SOIC -40° to +85°C
23S05E-1DCGI8 Tape and Reel 8-pin SOIC -40° to +85°C
23S05E-1HDCG Tubes 8-pin SOIC 0° to +70° C
23S05E-1HDCG8 Tape and Reel 8-pin SOIC 0° to +70° C
23S05E-1HDCGI Tubes 8-pin SOIC -40° to +85°C
23S05E-1HDCGI8 Tape and Reel 8-pin SOIC -40° to +85°C
