ABRACON ABB0205SC-T

ABB0205
Low Skew Output Buffer
FEATURES
•
•
Frequency range 25 ~ 60MHz.
Internal phase locked loop will allow spread spectrum modulation on reference clock to pass to the
outputs (up to 100kHz SST modulation).
Zero input - output delay.
Less than 700 ps device - device skew.
Less than 250 ps skew between outputs.
Less than 150 ps cycle - cycle jitter.
Output Enable function tri-state outputs.
3.3V operation.
Available in 8-Pin 150mil SOIC.
REF
1
CLK2
2
CLK1
3
GND
4
ABB0205
•
•
•
•
•
•
•
PIN CONFIGURATION
8
CLKOUT
7
CLK4
6
VDD
5
CLK3
Remark
If REF clock is stopped for more than 10us after it has already been
provided to the chip, and after power-up, the output clocks will
disappear. In that instance, a full power-up reset is required in order
to reactivate the output clocks.
DESCRIPTION
The ABB0205 is a high performance, low skew, low
jitter zero delay buffer designed to distribute high
speed clocks and is available in 8-pin SOIC package. It
has four outputs that are synchronized with the input.
The synchronization is established via CLKOUT feed
back to the input of the PLL. Since the skew between
the input and output is less than ±350 ps, the device
acts as a zero delay buffer.
BLOCK DIAGRAM
REF
PLL
CLKOUT
CLK1
CLK2
CLK3
CLK4
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ABB0205
Low Skew Output Buffer
PIN DESCRIPTIONS
Name
Number
Type
REF 1
1
I
CLK2 2
CLK1 2
GND
CLK3 2
VDD
CLK4 2
CLKOUT 2
2
3
4
5
6
7
8
O
O
P
O
P
O
O
Description
Input reference frequency. Spread spectrum modulation on this signal will be
passed to the output (up to 100kHz SST modulation).
Buffered clock output.
Buffered clock output.
Ground.
Buffered clock output.
3.3V Power Supply.
Buffered clock output.
Buffered clock output. Internal feed back on this pin.
Notes: 1: Weak pull-down. 2: Weak pull-down on all outputs.
ELECTRICAL SPECIFICATIONS
1. Absolute Maximum Ratings
PARAMETERS
SYMBOL
MIN.
V DD
VI
VO
TS
TA
TJ
-0.5
-0.5
-65
-40
Supply Voltage
Input Voltage, dc
Output Voltage, dc
Storage Temperature
Ambient Operating Temperature*
Junction Temperature
Lead Temperature (soldering, 10s)
ESD Protection, Human Body Model
MAX.
UNITS
4.6
V DD +0.5
V DD +0.5
150
85
125
260
2
V
V
V
°C
°C
°C
°C
kV
Exposure of the device under conditions beyond the limits specified by Maximum Ratings for extended periods may cause permanent damage to the
device and affect product reliability. These conditions represent a stress rating only, and functional operations of the device at these or any other conditions above the operational limits noted in this specification is not implied.
* Note: Operating Temperature is guaranteed by design for all parts (COMMERCIAL and INDUSTRIAL), but tested for COMMERCIAL grade only.
2. Electrical Characteristics
PARAMETERS
SYMBOL
Supply Voltage
Input Low Voltage
Input High Voltage
Input Low Current
Input High Current
Output Low Voltage
Output High Voltage
Power Down Supply Current
V DD
V IL
V IH
I IL
I IH
V OL
V OH
I DD
Supply Current
I DD
CONDITIONS
MIN.
TYP.
MAX.
UNITS
3.63
0.8
V
V
V
19
0.10
0.25
2.9
0.3
50.0
100.0
0.4
µA
µA
V
V
50.0
µA
35
45
mA
2.97
2.0
V IN = 0V
V IN = V DD
I OL = 50mA
I OH = 50mA
REF = 0MHz
Unloaded outputs at 133MHz,
SEL inputs at V DD or GND
2.4
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ABB0205
Low Skew Output Buffer
3. Switching Characteristics
PARAMETERS
SYMBOL
Output Frequency
DESCRIPTION
MIN.
t1
Duty Cycle ( t2 ÷ t1 )
Dt1
Duty Cycle ( t2 ÷ t1 )
Dt2
Rise Time
Tr
Fall Time
Tf
Output to Output Skew
T skew
Delay, REF Rising Edge to
CLKOUT Rising Edge
T delay
Device to Device Skew
T dsk-dsk
Cycle to Cycle Jitter
T cyc-cyc
PLL Lock Time
T lock
Jitter; Absolute Jitter
Jitter; 1-sima
T jabs
T j1-s
TYP.
25
Measured at 1.4V,
C L =30pF, F out = 60MHz
Measured at 1.4V
Measured between 0.8V
and 2.0V, C L =30pF
Measured between 2.0V
and 0.8V, C L =30pF
All outputs equally loaded,
C L =20pF
MAX.
UNITS
60
MHz
40.0
50.0
60.0
%
45.0
50.0
55.0
%
1.2
1.5
ns
1.2
1.5
ns
250
ps
0
±350
ps
0
700
ps
150
ps
1.0
ms
100
20
ps
ps
Measured at 1.4V
Measured at V DD /2 on the
CLKOUT pins of devices
Loaded outputs
Stable power supply, valid
clock presented on REF pin
At 10,000 cycles, C L =30pF
At 10,000 cycles, C L =30pF
70
10
SWITCHING WAVEFORMS
Duty Cycle Timing
Output - Output Skew
t1
t2
1.4V
1.4V
Output
1.4V
1.4V
1.4V
Output
TSKEW
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ABB0205
Low Skew Output Buffer
SWITCHING WAVE FORMS
All Outputs Rise/Fall Time
Output
3.3V
2.0V
2.0V
0.8V
0.8V
tr
0V
tf
Input to Output Propagation Delay
VDD/2
Input
VDD/2
Output
Tdelay
Device to Device Skew
VDD/2
Device1 CLKOUT
VDD/2
Device2 CLKOUT
Tdsk - dsk
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ABB0205
Low Skew Output Buffer
Output-Output Skew
The skew between CLKOUT and the CLK(1-4) outputs is not dynamically adjusted by the
PLL. Since CLKOUT is one of the inputs to the PLL, zero phase difference is maintained
from REF to CLKOUT. If all outputs are equally loaded, zero phase difference will
maintained from REF to all outputs.
If applications requiring zero output-output skew, all the outputs must equally loaded.
If the CLK(1-4) outputs are less loaded than CLKOUT, CLK(1-4) outputs will lead it; if the
CLK(0-4) is more loaded than CLKOUT, CLK(1-4) will lag the CLKOUT.
Since the CLKOUT and the CLK(1-4) outputs are identical, they all start at the same time,
but difference loads cause them to have different rise times and different times crossing
the measurement thresholds.
REF
REF
CLKOUT
CLKOUT
CLK(1-4)
CLK(1-4)
Zero Delay
REF input and all outputs loaded equally
Advanced
REF input and CLK(1-4) outputs loaded equally,
with CLK(1-4) less loaded than CLKOUT.
REF
CLKOUT
CLK(1-4)
Delayed
REF input and CLK(1-4) outputs loaded equally, with
CLK(1-4) more loaded than CLKOUT.
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 03/21/05 Page 5
ABB0205
Low Skew Output Buffer
PACKAGE INFORMATION
8 PIN Narrow SOIC ( mm )
SOIC
Symbol
Min.
Max.
A
A1
B
C
D
E
H
L
e
1.55
0.15
0.35
0.19
4.80
3.81
5.84
0.41
1.73
0.18
0.49
0.25
4.98
3.99
6.20
0.89
1.27 BSC
E
H
D
A
A
1
C
L
B
e
ORDERING INFORMATION
For part ordering, please contact our Sales Department:
30332 Esperanza., Rancho Santa Margarita, Ca 92688
Ph: 949-546-8000 Fax: 949-546-8001
PART NUMBER
The order number for this device is a combination of the following:
Device number, Package type and Operating temperature range
ABB0205 S C
TEMPERATURE
C=COMMERCIAL
I=INDUSTRIAL
PART NUMBER
PACKAGE TYPE
S=SOIC
Order Number
Marking
Package Option
ABB0205SC-T
ABB0205SC
ABB0205SC
ABB0205SC
SOIC - Tape and Reel
SO IC - Tube
Abracon Corporation, reserves the right to make changes in its products or specifications, or both at any time without notice. The information furnished by Abracon is believed to be accurate and reliable. However, Abracon makes no guarantee or warranty concerning the accuracy of said information and shall not be responsible for any loss or damage of whatever nature resulting from the use of, or reliance upon this product.
LIFE SUPPORT POLICY: Abracon’s products are not authorized for use as critical components in life support devices or systems without the express
written approval of the President of Abracon Corporation.
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 03/21/05 Page 6