Low Skew 1 to 4 Clock Buffer
524S
DATASHEET
Description
The 524S is a low skew, single input to four output, clock
buffer. The 524S has best in class additive phase Jitter of sub
50 fsec.
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.
Features
•
•
•
•
•
•
•
•
•
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Low additive phase jitter RMS: 50fs
Extremely low skew outputs (50ps)
Low cost clock buffer
Packaged in 8-pin SOIC and 8-pin DFN, Pb-free
Input/Output clock frequency up to 200 MHz
Non-inverting output clock
Ideal for networking clocks
Operating Voltages: 1.8V to 3.3V
Advanced, low power CMOS process
Extended temperature range (-40°C to +105°C)
Block Diagram
Q0
Q1
ICLK
Q2
Q3
524S REVISION A 03/18/15
1
©2015 Integrated Device Technology, Inc.
524S DATASHEET
Pin Assignments
ICLK
Q0
Q1
NC
1
2
3
4
8-pin SOIC
8
7
6
5
GND
Q3
Q2
VDD
ICLK
Q0
Q1
NC
1
2
3
4
8
7
6
5
GND
Q3
Q2
VDD
8-pin DFN
Pin Descriptions
Pin
Number
1
2
3
4
5
6
7
8
Pin
Name
ICLK
Q0
Q1
NC
VDD
Q2
Q3
GND
Pin
Type
Input
Output
Output
–
Power
Output
Output
Power
Clock input.
Clock output 0.
Clock output 1.
No connect.
Connect to +1.8V, +2.5 V, or +3.3 V.
Clock Output 2.
Clock Output 3.
Connect to ground.
Pin Description
External Components
A minimum number of external components are required for proper operation. A decoupling capacitor of 0.01µF should be
connected between VDD on pin 5 and GND on pin 8, 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 524S 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.
LOW SKEW 1 TO 4 CLOCK BUFFER
2
REVISION A 03/18/15
524S DATASHEET
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the 524S. 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
Outputs
ICLK
Ambient Operating Temperature (extended)
Storage Temperature
Junction Temperature
Soldering Temperature
3.465V
-0.5 V to VDD+0.5 V
3.465V
-40° to +105°C
-65° to +150°C
125°C
260°C
Rating
Recommended Operation Conditions
Parameter
Ambient Operating Temperature (extended)
Power Supply Voltage (measured in respect to GND)
Min.
-40
+1.71
Typ.
Max.
+105
+3.465
Units
C
V
REVISION A 03/18/15
3
LOW SKEW 1 TO 4 CLOCK BUFFER
524S DATASHEET
DC Electrical Characteristics
(VDD = 1.8V, 2.5V, 3.3V)
VDD=1.8V ±5%
, Ambient temperature -40° to +105°C, unless stated otherwise
Parameter
Operating Voltage
Input High Voltage, ICLK
Input Low Voltage, ICLK
Output High Voltage
Output Low Voltage
Operating Supply Current
Nominal Output Impedance
Input Capacitance
Symbol
VDD
V
IH
V
IL
V
OH
V
OL
IDD
Z
O
C
IN
Conditions
Note 1
Note 1
I
OH
= -10 mA
I
OL
= 10 mA
No load, 135 MHz
ICLK
Min.
1.71
0.7xVDD
1.3
Typ.
Max.
1.89
VDD
0.3xVDD
0.35
Units
V
V
V
V
V
mA
pF
16
17
5
Notes: 1. Nominal switching threshold is VDD/2
VDD=2.5 V ±5%
, Ambient temperature -40° to +105°C, unless stated otherwise
Parameter
Operating Voltage
Input High Voltage, ICLK
Input Low Voltage, ICLK
Output High Voltage
Output Low Voltage
Operating Supply Current
Nominal Output Impedance
Input Capacitance
Symbol
VDD
V
IH
V
IL
V
OH
V
OL
IDD
Z
O
C
IN
Conditions
Note 1
Note 1
I
OH
= -16 mA
I
OL
= 16 mA
No load, 135 MHz
ICLK
Min.
2.375
0.7xVDD
1.8
Typ.
Max.
2.625
VDD
0.3xVDD
0.5
Units
V
V
V
V
V
mA
pF
18
17
5
VDD=3.3 V ±5%
, Ambient temperature -40° to +105°C, unless stated otherwise
Parameter
Operating Voltage
Input High Voltage, ICLK
Input Low Voltage, ICLK
Output High Voltage
Output Low Voltage
Operating Supply Current
Nominal Output Impedance
Input Capacitance
Symbol
VDD
V
IH
V
IL
V
OH
V
OL
IDD
Z
O
C
IN
Conditions
Note 1
Note 1
I
OH
= -25 mA
I
OL
= 25 mA
No load, 135 MHz
ICLK
Min.
3.15
0.7xVDD
2.2
Typ.
Max.
3.45
VDD
0.3xVDD
0.7
Units
V
V
V
V
V
mA
pF
22
17
5
LOW SKEW 1 TO 4 CLOCK BUFFER
4
REVISION A 03/18/15
524S DATASHEET
AC Electrical Characteristics
(VDD = 1.8V, 2.5V, 3.3V)
VDD = 1.8V ±5%
, Ambient Temperature -40° to +105°C, unless stated otherwise
Parameter
Input Frequency
Output Rise Time
Output Fall Time
Propagation Delay
Buffer Additive Phase Jitter, RMS
Output to Output Skew
Device to Device Skew
Start-up Time
t
START-UP
t
OR
t
OF
0.36 to 1.44 V, C
L
=5 pF
1.44 to 0.36 V, C
L
=5 pF
Note 1
125MHz, Integration Range: 12kHz-20MHz
Rising edges at VDD/2, Note 2
Rising edges at VDD/2
Part start-up time for valid outputs after
VDD ramp-up
1.5
Symbol
Conditions
Min.
0
Typ.
0.6
0.6
2
Max.
200
1.0
1.0
4
0.05
65
200
2
Units
MHz
ns
ns
ns
ps
ps
ps
ms
VDD = 2.5 V ±5%
, Ambient Temperature -40° to +105°C, unless stated otherwise
Parameter
Input Frequency
Output Rise Time
Output Fall Time
Propagation Delay
Buffer Additive Phase Jitter, RMS
Output to Output Skew
Device to Device Skew
Start-up Time
t
START-UP
t
OR
t
OF
0.5 to 2.0 V, C
L
=5 pF
2.0 to 0.5 V, C
L
=5 pF
Note 1
125MHz, Integration Range: 12kHz-20MHz
Rising edges at VDD/2, Note 2
Rising edges at VDD/2
Part start-up time for valid outputs after
VDD ramp-up
1.8
Symbol
Conditions
Min.
0
Typ.
0.6
0.6
2.5
Max.
200
1.0
1.0
4.5
0.05
65
200
2
Units
MHz
ns
ns
ns
ps
ps
ps
ms
VDD = 3.3 V ±5%
, Ambient Temperature -40° to +105°C, unless stated otherwise
Parameter
Input Frequency
Output Rise Time
Output Fall Time
Propagation Delay
Buffer Additive Phase Jitter, RMS
Output to Output Skew
Device to Device Skew
Start-up Time
t
START-UP
t
OR
t
OF
0.66 to 2.64 V, C
L
=5 pF
2.64 to 0.66 V, C
L
=5 pF
Note 1
125MHz, Integration Range: 12kHz-20MHz
Rising edges at VDD/2, Note 2
Rising edges at VDD/2
Part start-up time for valid outputs after
VDD ramp-up
1.5
Symbol
Conditions
Min.
0
Typ.
0.6
0.6
2
Max.
200
1.0
1.0
4
0.05
65
200
2
Units
MHz
ns
ns
ns
ps
ps
ps
ms
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.
REVISION A 03/18/15
5
LOW SKEW 1 TO 4 CLOCK BUFFER
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