DATASHEET
LOW SKEW 1 TO 4 CLOCK BUFFER
Description
The IDT5T30553 is a low skew, single input to four output,
clock buffer.
IDT makes many non-PLL and PLL based low skew output
devices as well as Zero Delay Buffers to synchronize
clocks. Contact us for all of your clocking needs.
IDT5T30553
Features
•
•
•
•
•
•
Extremely low skew outputs (50 ps maximum)
Packaged in 8-pin SOIC – Pb-free, RoHS compliant
Low power CMOS technology
Operating voltages of 2.5 V to 3.3 V
Output Enable pin tri-states outputs
Commercial (0 to +70°C) and Industrial (-40°C to +85°C)
temperature ranges
Block Diagram
Q0
Q1
ICLK
Q2
Q3
Output Enable
IDT®
LOW SKEW 1 TO 4 CLOCK BUFFER
1
IDT5T30553
REV F 121013
IDT5T30553
LOW SKEW 1 TO 4 CLOCK BUFFER
FAN OUT BUFFER
Pin Assignment
VDD
Q0
Q1
GN D
1
2
3
4
8 - p i n S OI C
8
7
6
5
OE
Q3
Q2
I CL K
Pin Descriptions
Pin
Pin
Number Name
1
2
3
4
5
6
7
8
VDD
Q0
Q1
GND
ICLK
Q2
Q3
OE
Pin
Type
Power
Output
Output
Power
Input
Output
Output
Input
Connect to +2.5 V or +3.3 V.
Clock output 0.
Clock output 1.
Connect to ground.
Clock input.
Clock Output 2.
Clock Output 3.
Pin Description
Output Enable. Tri-states outputs when low. Connect to VDD for normal operation.
External Components
A minimum number of external components are required for proper operation. A decoupling capacitor of 0.01 µF
should be connected between VDD on pin 1 and GND on pin 4, as close to the device as possible. A 33
series
terminating resistor may be used on each clock output if the trace is longer than 1 inch.
To achieve the low output skew that the IDT5T30553 is capable of, careful attention must be paid to board layout.
Essentially, all four outputs must have identical terminations, identical loads and identical trace geometries. If they
do not, the output skew will be degraded. For example, using a 30
series termination on one output (with 33
on
the others) will cause at least 15 ps of skew.
IDT®
LOW SKEW 1 TO 4 CLOCK BUFFER
2
IDT5T30553
REV F 121013
IDT5T30553
LOW SKEW 1 TO 4 CLOCK BUFFER
FAN OUT BUFFER
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the IDT5T30553. These ratings, which
are standard values for IDT commercially rated parts, are stress ratings only. Functional operation of the device at
these or any other conditions above those indicated in the operational sections of the specifications is not implied.
Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical
parameters are guaranteed only over the recommended operating temperature range.
Item
Supply Voltage, VDD
Output Enable and All Outputs
ICLK
Ambient Operating Temperature (industrial)
Storage Temperature
Junction Temperature
Soldering Temperature
7V
Rating
-0.5V to VDD+0.5 V
-0.5V to VDD+0.5V
-40
C to +85
C
-65
C to +150
C
125
C
260
C
Recommended Operation Conditions
Parameter
Ambient Operating Temperature (industrial)
Power Supply Voltage (measured in respect to GND)
Min.
-40
+2.375
Typ.
Max.
+85
+3.465
Units
C
V
DC Electrical Characteristics
VDD=2.5 V ±5%
, Ambient temperature -40 to +85
C, unless stated otherwise
Parameter
Operating Voltage
Input High Voltage, OE
Input Low Voltage, OE
Output High Voltage
Output Low Voltage
Operating Supply Current
Nominal Output Impedance
Input Capacitance
Short Circuit Current
Symbol
VDD
V
IH
V
IL
V
OH
V
OL
IDD
Z
O
C
IN
I
OS
Conditions
Min.
2.375
1.8
Typ.
Max.
2.625
VDD
0.7
Units
V
V
V
V
V
mA
I
OH
= -16 mA
I
OL
= 16 mA
No load, 135 MHz
ICLK, OE pin
2
0.4
25
20
5
±28
pF
mA
IDT®
LOW SKEW 1 TO 4 CLOCK BUFFER
3
IDT5T30553
REV F 121013
IDT5T30553
LOW SKEW 1 TO 4 CLOCK BUFFER
FAN OUT BUFFER
DC Electrical Characteristics (continued)
VDD=3.3 V ±5%
, Ambient temperature -40 to +85
C, unless stated otherwise
Parameter
Operating Voltage
Input High Voltage, OE
Input Low Voltage, OE
Output High Voltage
Output Low Voltage
Output High Voltage (CMOS
Level)
Operating Supply Current
Nominal Output Impedance
Input Capacitance
Short Circuit Current
Symbol
VDD
V
IH
V
IL
V
OH
V
OL
V
OH
IDD
Z
O
C
IN
I
OS
Conditions
Min.
3.135
2
Typ.
Max.
3.465
VDD
0.8
Units
V
V
V
V
V
V
I
OH
= -25 mA
I
OL
= 25 mA
I
OH
= -12 mA
No load, 135 MHz
ICLK, OE pin
2.4
0.4
VDD-0.4
35
20
5
±50
mA
pF
mA
Notes: 1. Nominal switching threshold is VDD/2
AC Electrical Characteristics
VDD = 2.5 V ±5%
, Ambient Temperature -40 to +85
C, unless stated otherwise
Parameter
Input Frequency
Output Rise Time
Output Fall Time
Additive Period Jitter
Propagation Delay
Output to Output Skew
Device to Device Skew
Note 1
Note 2
Rising edges at VDD/2
Rising edges at VDD/2
2.2
3
0
t
OR
t
OF
0.8 to 2.0 V, C
L
=15 pF
2.0 to 0.8 V, C
L
=15 pF
Symbol
Conditions
Min.
0
Typ.
1.0
1.0
Max. Units
200
1.5
1.5
1
5
50
500
MHz
ns
ns
ps
ns
ps
ps
VDD = 3.3 V ±5%
, Ambient Temperature -40 to +85
C, unless stated otherwise
Parameter
Input Frequency
Output Rise Time
Output Fall Time
Propagation Delay
Additive Period Jitter
Output to Output Skew
Device to Device Skew
Note 2
Rising edges at VDD/2
Rising edges at VDD/2
0
t
OR
t
OF
Note 1
0.8 to 2.0 V, C
L
=15 pF
2.0 to 0.8 V, C
L
=15 pF
2.0
Symbol
Conditions
Min.
0
Typ.
0.6
0.6
2.4
Max. Units
200
1.0
1.0
4
1
50
500
MHz
ns
ns
ns
ps
ps
ps
Notes: 1. With rail to rail input clock.
2. Between any 2 outputs with equal loading.
3. Duty cycle on outputs will match incoming clock duty cycle. Consult IDT for tight duty cycle clock
generators.
IDT®
LOW SKEW 1 TO 4 CLOCK BUFFER
4
IDT5T30553
REV F 121013
IDT5T30553
LOW SKEW 1 TO 4 CLOCK BUFFER
FAN OUT BUFFER
Thermal Characteristics
Parameter
Thermal Resistance Junction to
Ambient
Symbol
JA
JA
JA
JC
Conditions
Still air
1 m/s air flow
3 m/s air flow
Min.
Typ.
150
140
120
40
Max. Units
C/W
C/W
C/W
C/W
Thermal Resistance Junction to Case
Marking Diagrams
8
5
8
5
IDT5T30
553DCG
YYWW$
IDT5T30
553DCGI
YYWW$
1
Notes:
4
1
4
1. “$” is the mark code.
2. YYWW is the last two digits of the year and week that the part was assembled.
3 “G” after the two-letter package code denotes RoHS compliant package.
4. “I” denotes industrial temperature range device.
5. Bottom marking: country of origin.
IDT®
LOW SKEW 1 TO 4 CLOCK BUFFER
5
IDT5T30553
REV F 121013
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