IDT2305NZT
2.5V CLOCK BUFFER
COMMERCIAL TEMPERATURE RANGE
2.5V CLOCK BUFFER
IDT2305NZT
FEATURES:
•
•
•
•
•
•
•
Clock Distribution
10MHz to 133MHz operating frequency
Distributes one clock input to one bank of five outputs
Output Skew < 250ps
No external RC network required
Operates at 2.5V V
DD
Available in SOIC package
DESCRIPTION:
The IDT2305NZT is a high-speed clock buffer, designed to address
high-speed clock distribution applications. IDT2305NZT accepts one
reference input, and drives out five low skew clocks.
FUNCTIONAL BLOCK DIAGRAM
8
CLKOUT
3
REF
1
Control
Logic
2
CLK1
CLK2
5
7
CLK3
CLK4
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
COMMERCIAL TEMPERATURE RANGE
1
c
2006
Integrated Device Technology, Inc.
JUNE 2006
DSC 7020/4
IDT2305NZT
2.5V CLOCK BUFFER
COMMERCIAL TEMPERATURE RANGE
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
Input Clamp Current
Continuous Output Current
Continuous Current
Maximum Power Dissipation
Storage Temperature Range
Commercial Temperature
Range
Max.
–0.5 to +4.6
–0.5 to +5.5
–0.5 to
V
DD
+0.5
–50
±50
±100
0.7
–65 to +150
0 to +70
mA
mA
mA
W
°C
°C
Unit
V
V
V
REF
CLK2
CLK1
GND
1
2
3
4
8
7
6
5
CLKOUT
CLK4
V
DD
CLK3
V
I (2)
V
I
SOIC
TOP VIEW
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
(1)
CLK2
(2)
CLK1
(2)
GND
CLK3
V
DD
CLK4
(2)
CLKOUT
(2)
NOTES:
1. Weak pull down.
2. Weak pull down on all outputs.
(2)
Pin Number
1
2
3
4
5
6
7
8
Type
IN
OUT
OUT
GND
OUT
PWR
OUT
OUT
Output clock
Output clock
Ground
Output clock
2.5V Supply
Output clock
Output clock
Functional Description
Input reference clock, 3.3V tolerant input
2
IDT2305NZT
2.5V CLOCK BUFFER
COMMERCIAL TEMPERATURE RANGE
OPERATING CONDITIONS
Symbol
V
DD
T
A
C
L
C
IN
Supply Voltage
Operating Temperature (Ambient Temperature)
Load Capacitance 10MHz - 133MHz
Input Capacitance
Parameter
Min.
2.3
0
—
—
Max.
2.7
+70
15
7
Unit
V
°
C
pF
pF
DC ELECTRICAL CHARACTERISTICS
Symbol
V
IL
V
IH
I
IL
I
IH
V
OL
V
OH
I
DD_PD
I
DD
Parameter
Input LOW Voltage Level
Input HIGH Voltage Level
Input LOW Current
Input HIGH Current
Output LOW Voltage
Output HIGH Voltage
Power Down Current
Supply Current
V
IN
= 0V
V
IN
= V
DD
Standard Drive, I
OL
= 8mA
Standard Drive, I
OH
= -8mA
REF = 0MHz
Unloaded Outputs at 66.66MHz
Conditions
Min.
—
1.7
—
—
—
2
—
—
Max.
0.7
—
50
100
0.3
—
12
32
Unit
V
V
µA
µA
V
V
µA
mA
SWITCHING CHARACTERISTICS
Symbol
t
1
t
3
t
4
t
5
t
6
t
7
Parameter
Output Frequency
Duty Cycle = t
2
÷
t
1
Rise Time
Fall Time
Output to Output Skew
Delay, REF Rising Edge to CLKOUT Rising Edge
Device-to-Device Skew
(1,2)
Conditions
15pF Load
Measured at V
DD
/2, F
OUT
= 66.66MHz
Measured between 0.7V and 1.7V
Measured between 0.7V and 1.7V
All outputs equally loaded
Measured at V
DD
/2
Measured at V
DD
/2 on the CLKOUT pins of devices
Min.
10
40
—
—
—
—
—
Typ.
—
50
—
—
—
0
0
Max.
133
60
2.5
2.5
250
8.7
700
Unit
MHz
%
ns
ns
ps
ns
ps
NOTES:
1. REF Input has a threshold voltage of V
DD
/2.
2. All parameters specified with loaded outputs.
3
IDT2305NZT
2.5V CLOCK BUFFER
COMMERCIAL TEMPERATURE RANGE
TEST CIRCUIT
V
DD
0.1μF
OUTPUTS
CLK
OUT
C
LOAD
V
DD
0.1μF
GND
GND
Test Circuit for All Parameters
SWITCHING WAVEFORMS
t1
t2
V
DD
/2
V
DD
/2
V
DD
/2
Output
Output
V
DD
/2
V
DD
/2
t5
Duty Cycle Timing
Output to Output Skew
Output
0.7V
t3
1.7V 1.7V
0.7V
t4
2.5V
0V
REF
Output
t6
V
DD/
2
V
DD/
2
All Outputs Rise/Fall Time
Input to Output Propagation Delay
CLK
OUT
Device 1
CLK
OUT
Device 2
V
DD
/2
t7
V
DD
/2
Device to Device Skew
4
IDT2305NZT
2.5V CLOCK BUFFER
COMMERCIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDT
XXXXX
Device Type
XX
Package
X
Process
Blank
DC
DCG
2305NZT-1
Commercial (0
o
C to +70
o
C)
Small Outline
SOIC - Green
2.5V Clock Buffer
CORPORATE HEADQUARTERS
6024 Silver Creek Valley Road
San Jose, CA 95138
for SALES:
800-345-7015 or 408-284-8200
fax: 408-284-2775
www.idt.com
for Tech Support:
clockhelp@idt.com
5
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