IDT 23S05T-1DCG

IDT23S05T
2.5V ZERO DELAY CLOCK BUFFER, SPREAD SPECTRUM COMPATIBLE
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
IDT23S05T
2.5V ZERO DELAY CLOCK
BUFFER, SPREAD SPECTRUM
COMPATIBLE
FEATURES:
•
•
•
•
•
•
•
•
•
•
•
DESCRIPTION:
Phase-Lock Loop Clock Distribution
10MHz to 133MHz 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
No external RC network required
Operates at 2.5V VDD
Power down mode
Spread spectrum compatible
Available in SOIC package
The IDT23S05T 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 133MHz.
The IDT23S05T is an 8-pin version of the IDT23S09T. IDT23S05T
accepts one reference input, and drives out five low skew clocks. 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 IDT23S05T enters power down. In this mode, the
device will draw less than 12µA for Commercial Temperature Range and
and less than 25µA for Industrial temperature range, the outputs are tristated, and the PLL is not running, resulting in a significant reduction of
power. The IDT23S05T is characterized for both Industrial and Commercial operation.
FUNCTIONAL BLOCK DIAGRAM
8
CLKOUT
REF
1
3
PLL
CLK1
Control
Logic
2
5
CLK2
CLK3
7
CLK4
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
MAY 2010
1
c
2006
Integrated Device Technology, Inc.
DSC 6397/11
IDT23S05T
2.5V ZERO DELAY CLOCK BUFFER, SPREAD SPECTRUM COMPATIBLE
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
ABSOLUTE MAXIMUM RATINGS(1)
PIN CONFIGURATION
Symbol
REF
1
8
CLKOUT
CLK2
2
7
CLK4
CLK1
3
6
VDD
GND
4
5
CLK3
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
VI
Input Voltage Range
–0.5 to
V
(except REF)
IIK (VI < 0)
Input Clamp Current
IO (VO = 0 to VDD)
VDD or GND
TA = 55°C
VDD+0.5
–50
mA
Continuous Output Current
±50
mA
Continuous Current
±100
mA
Maximum Power Dissipation
0.7
W
TSTG
Storage Temperature Range
–65 to +150
°C
Operating
Commercial
0 to +70
°C
Temperature
Industrial
(in still air)(3)
SOIC
TOP VIEW
–40 to +85
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.
APPLICATIONS:
•
•
•
•
•
SDRAM
Telecom
Datacom
PC Motherboards/Workstations
Critical Path Delay Designs
PIN DESCRIPTION
Pin Name
REF
Pin Number
Type
Functional Description
1
IN
Input reference clock, 3.3V tolerant input
CLK2(2)
2
Out
Output clock
CLK1
3
Out
Output clock
4
Ground
(1)
(2)
GND
CLK3
(2)
VDD
CLK4
(2)
CLKOUT
(2)
Ground
5
Out
Output clock
6
PWR
2.5V Supply
7
Out
Output clock
8
Out
Output clock, internal feedback on this pin
NOTES:
1. Weak pull down.
2. Weak pull down on all outputs.
2
IDT23S05T
2.5V ZERO DELAY CLOCK BUFFER, SPREAD SPECTRUM COMPATIBLE
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
OPERATING CONDITIONS
Symbol
Parameter
VDD
Supply Voltage
TA
Operating Temperature (Ambient Temperature)
Commercial
Industrial
Min.
Max.
Unit
2.3
2.7
V
°C
0
+70
–40
+85
CL
Load Capacitance 10MHz - 133MHz
—
15
pF
CIN
Input Capacitance
—
7
pF
DC ELECTRICAL CHARACTERISTICS
Symbol
Parameter
Conditions
Min.
Max.
Unit
VIL
Input LOW Voltage Level
—
0.7
V
VIH
Input HIGH Voltage Level
1.7
—
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
—
0.3
V
VOH
Output HIGH Voltage
Standard Drive, IOH = -8mA
IDD_PD
Power Down Current
REF = 0MHz
Supply Current
Unloaded Outputs at 66.66MHz
IDD
2
—
V
Commercial
—
12
µA
Industrial
—
25
—
32
mA
(1,2)
SWITCHING CHARACTERISTICS
Symbol
t1
Parameter
Output Frequency
Conditions
15pF Load
Min.
Typ.
Max.
Unit
10
—
133
MHz
Duty Cycle = t2 ÷ t1
Measured at VDD/2, FOUT = 66.66MHz
40
50
60
%
t3
Rise Time
Measured between 0.7V and 1.7V
—
—
2.5
ns
t4
Fall Time
Measured between 0.7V and 1.7V
—
—
2.5
ns
t5
Output to Output Skew
All outputs equally loaded
—
—
250
ps
t6
Delay, REF Rising Edge to CLKOUT Rising Edge
Measured at VDD/2
—
0
±350
ps
t7
Device-to-Device Skew
Measured at VDD/2 on the CLKOUT pins of devices
—
0
700
ps
tJ
Cycle-to-Cycle Jitter, pk - pk
Measured at 66.66MHz, loaded outputs
—
—
200
ps
PLL Lock Time
Stable power supply, valid clock presented on REF pin
—
—
1
ms
tLOCK
NOTES:
1. REF Input has a threshold voltage of VDD/2.
2. All parameters specified with loaded outputs.
3
IDT23S05T
2.5V ZERO DELAY CLOCK BUFFER, SPREAD SPECTRUM COMPATIBLE
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
ZERO DELAY 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.
4
IDT23S05T
2.5V ZERO DELAY CLOCK BUFFER, SPREAD SPECTRUM COMPATIBLE
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
TEST CIRCUIT
VDD
0.1 F
CLKOUT
OUTPUTS
CLOAD
VDD
0.1 F
GND
GND
Test Circuit for All Parameters
SWITCHING WAVEFORMS
t1
Output
VDD/2
t2
VDD/2
VDD/2
VDD/2
VDD/2
Output
t5
Output to Output Skew
Duty Cycle Timing
Output
0.7V
t3
1.7V 1.7V
0.7V
2.5V
VDD/2
REF
0V
t4
VDD/2
Output
t6
Input to Output Propagation Delay
All Outputs Rise/Fall Time
CLKOUT
Device 1
CLKOUT
Device 2
VDD/2
t7
VDD/2
Device to Device Skew
5
IDT23S05T
2.5V ZERO DELAY CLOCK BUFFER, SPREAD SPECTRUM COMPATIBLE
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
ORDERING INFORMATION
IDT
XXXXX
Device Type
XX
Package
X
Process
Blank
I
Commercial (0oC to +70oC)
Industrial (-40oC to +85oC)
DC
DCG
Small Outline
SOIC - Green
23S05T-1 2.5V Zero Delay Clock Buffer, Spread Spectrum Compatible
Part / Order Number
Shipping Packaging
Package
23S05T-1DCG
23S05T-1DCG8
23S05T-1DCGI
23S05T-1DCGI8
Tubes
Tape and Reel
Tubes
Tape and Reel
8-pin SOIC
8-pin SOIC
8-pin SOIC
8-pin SOIC
CORPORATE HEADQUARTERS
6024 Silver Creek Valley Road
San Jose, CA 95138
Temperature
for SALES:
800-345-7015 or 408-284-8200
fax: 408-284-2775
www.idt.com
6
0° to +70° C
0° to +70° C
-40° to +85°C
-40° to +85°C
for Tech Support:
clockhelp@idt.com