Cypress CY2304SXC-1 3.3v zero delay buffer Datasheet

CY2304
3.3V Zero Delay Buffer
Features
■
Zero input-output propagation delay, adjustable by
capacitive load on FBK input
required to be driven into the FBK pin, and can be obtained
from one of the outputs. The input-to-output skew is
guaranteed to be less than 250 ps, and output-to-output skew
is guaranteed to be less than 200 ps.
■
Multiple configurations — see Table 1 on page 1
The CY2304 has two banks of two outputs each.
■
Multiple low-skew outputs
■
10 MHz to 133 MHz operating range
■
90 ps typical peak cycle-to-cycle jitter at 15 pF, 66 MHz
■
Space-saving 8-pin 150-mil SOIC package
■
3.3V operation
■
Industrial temperature available
The CY2304 PLL enters a power down state when there are
no rising edges on the REF input. In this mode, all outputs are
three-stated and the PLL is turned off, resulting in less than
25 μA of current draw.
Multiple CY2304 devices can accept the same input clock and
distribute it in a system. In this case, the skew between the
outputs of two devices is guaranteed to be less than 500 ps.
The CY2304 is available in two different configurations, as
shown in Table 1 on page 1. The CY2304–1 is the base part,
where the output frequencies equal the reference if there is no
counter in the feedback path.
Functional Description
The CY2304 is a 3.3V zero delay buffer designed to distribute
high-speed clocks in PC, workstation, datacom, telecom, and
other high performance applications.
The part has an on-chip phase-locked loop (PLL) that locks to
an input clock presented on the REF pin. The PLL feedback is
The CY2304–2 allows the user to obtain Ref and 1/2x or 2x
frequencies on each output bank. The exact configuration and
output frequencies depends on which output drives the
feedback pin.
Logic Block Diagram
FBK
CLKA1
PLL
REF
CLKA2
/2
Extra Divider (-2)
CLKB1
CLKB2
Table 1. Available Configurations
Device
FBK from
Bank A Frequency
Bank B Frequency
CY2304-1
Bank A or B
Reference
Reference
CY2304-2
Bank A
Reference
Reference/2
CY2304-2
Bank B
2 × Reference
Reference
Pinouts
Figure 1. 8-Pin SOIC - Top View
REF
CLKA1
CLKA2
GND
Cypress Semiconductor Corporation
Document #: 38-07247 Rev. *E
•
1
2
3
4
198 Champion Court
8
7
6
5
FBK
VDD
CLKB2
CLKB1
•
San Jose, CA 95134-1709
•
408-943-2600
Revised September 18, 2008
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CY2304
l
Table 2. Pin Definitions - 8-Pin SOIC
Pin
Signal
1
REF[1]
Description
2
CLKA1[2]
3
[2]
CLKA2
4
GND
5
CLKB1[2]
Clock output, Bank B
6
[2]
CLKB2
Clock output, Bank B
7
VDD
3.3V supply
8
FBK
PLL feedback input
Input reference frequency, 5V tolerant input
Clock output, Bank A
Clock output, Bank A
Ground
Zero Delay and Skew Control
Figure 2. REF. Input to CLKA/CLKB Delay vs. Difference in Loading Between FBK Pin and CLKA/CLKB Pins
To close the feedback loop of the CY2304, the FBK pin can be driven from any of the four available output pins. The output driving
the FBK pin is driving a total load of 7 pF, with any additional load that it drives. The relative loading of this output (with respect to the
remaining outputs) can adjust the input-output delay. This is shown in Figure 2.
For applications requiring zero input-output delay, all outputs including the one providing feedback must be equally loaded. If
input-output delay adjustments are required, use the above graph to calculate loading differences between the feedback output and
remaining outputs.
For zero output-output skew, be sure to load outputs equally. For further information on using CY2304, refer to the application note
AN1234 “CY2308: Zero Delay Buffer.”
Notes
1. Weak pull down.
2. Weak pull down on all outputs.
Document #: 38-07247 Rev. *E
Page 2 of 9
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CY2304
Maximum Ratings
Supply Voltage to Ground Potential.................–0.5V to +7.0V
Storage Temperature ..................................–65°C to +150°C
DC Input Voltage (Except Ref) ...............–0.5V to VDD + 0.5V
Junction Temperature ..................................................150°C
DC Input Voltage REF.............................................–0.5 to 7V
Static Discharge Voltage
(per MIL-STD-883, Method 3015) .............................> 2000V
Operating Conditions for CY2304SC-X Commercial Temperature Devices
Parameter
Description
Min
Max
Unit
3.0
3.6
V
0
70
°C
VDD
Supply Voltage
TA
Operating Temperature (Ambient Temperature)
CL
Load Capacitance (below 100 MHz)
–
30
pF
Load Capacitance (from 100 MHz to 133 MHz)
–
15
pF
CIN
Input Capacitance[3]
–
7
pF
tPU
Power up time for all VDDs to reach minimum specified voltage (power
ramps must be monotonic)
0.05
50
ms
Electrical Characteristics for CY2304SC-X Commercial Temperature Devices
Parameter
Description
Test Conditions
Min
Max
Unit
VIL
Input LOW Voltage
–
0.8
V
VIH
Input HIGH Voltage
2.0
–
V
IIL
Input LOW Current
VIN = 0V
–
50.0
μA
IIH
Input HIGH Current
VIN = VDD
–
100.0
μA
Output LOW
Voltage[4]
IOL = 8 mA (–1, –2)
–
0.4
V
Output HIGH
Voltage[4]
IOH = –8 mA (–1, –2)
2.4
–
V
VOL
VOH
IDD (PD mode) Power down Supply Current REF = 0 MHz
–
25.0
μA
IDD
Unloaded outputs, 100 MHz REF, Select
inputs at VDD or GND
–
45.0
mA
Unloaded outputs, 66 MHz REF (–1,–2)
–
32.0
mA
Unloaded outputs, 33 MHz REF (–1,–2)
–
18.0
mA
Supply Current
Switching Characteristics for CY2304SC-X Commercial Temperature Devices
Parameter[5]
Name
Test Conditions
Min
Typ.
Max
Unit
t1
Output Frequency
30 pF load, all devices
10
–
100
MHz
t1
Output Frequency
15 pF load, –1, –2 devices
10
–
133.3
MHz
40.0
50.0
60.0
%
Cycle[4]
= t2 ÷ t1
tDC
Duty
(–1,–2)
t3
Rise Time[4]
(–1, –2)
Measured between 0.8V and 2.0V,
30 pF load
–
–
2.20
ns
t3
Rise Time[4]
(–1, –2)
Measured between 0.8V and 2.0V,
15 pF load
–
–
1.50
ns
t4
Fall Time[4]
(–1, –2)
Measured between 0.8V and 2.0V,
30 pF load
–
–
2.20
ns
Measured at 1.4V,
FOUT = 66.66 MHz, 30 pF load
Notes
3. Applies to both REF clock and FBK.
4. Parameter is guaranteed by design and characterization. Not 100% tested in production.
5. All parameters are specified with loaded output.
Document #: 38-07247 Rev. *E
Page 3 of 9
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CY2304
Switching Characteristics for CY2304SC-X Commercial Temperature Devices (continued)
Parameter[5]
Name
[4]
Test Conditions
Min
Typ.
Max
Unit
Measured between 0.8V and 2.0V,
15 pF load
–
–
1.50
ns
t4
Fall Time
(–1, –2)
t5
Output-to-Output Skew on
same Bank (–1,–2)[4]
All outputs equally loaded
–
–
200
ps
Output Bank A to Output
Bank B Skew (–1)
All outputs equally loaded
–
–
200
ps
Output Bank A to Output
Bank B Skew (–2)
All outputs equally loaded
–
–
400
ps
t6
Skew, REF Rising Edge to
FBK Rising Edge[4]
Measured at VDD/2
–
0
±250
ps
t7
Device-to-Device Skew[4]
Measured at VDD/2 on the FBK pins of
devices
–
0
500
ps
tJ
Cycle-to-Cycle Jitter[4]
(–1)
Measured at 66.67 MHz, loaded outputs,
15 pF load
–
90
175
ps
Measured at 66.67 MHz, loaded outputs,
30 pF load
–
–
200
ps
Measured at 133.3 MHz, loaded outputs,
15 pF load
–
–
100
ps
Measured at 66.67 MHz, loaded outputs 30
pF load
–
–
400
ps
Measured at 66.67 MHz, loaded outputs 15
pF load
–
–
375
ps
Stable power supply, valid clocks
presented on REF and FBK pins
–
–
1.0
ms
Cycle-to-Cycle Jitter[4]
(–2)
tJ
tLOCK
PLL Lock Time[4]
Operating Conditions for CY2304SI-X Industrial Temperature Devices
Min
Max
Unit
VDD
Parameter
Supply Voltage
3.0
3.6
V
TA
Operating Temperature (Ambient Temperature)
–40
85
°C
CL
Load Capacitance (below 100 MHz)
–
30
pF
Load Capacitance (from 100 MHz to 133 MHz)
–
15
pF
Input Capacitance
–
7
pF
Min
Max
Unit
–
0.8
V
CIN
Description
Electrical Characteristics for CY2304SI-X Industrial Temperature Devices
Parameter
Description
Test Conditions
VIL
Input LOW Voltage
VIH
Input HIGH Voltage
2.0
–
V
IIL
Input LOW Current
VIN = 0V
–
50.0
μA
IIH
Input HIGH Current
VIN = VDD
–
100.0
μA
VOL
Output LOW Voltage[4]
IOL = 8 mA (–1, –2)
–
0.4
V
VOH
Voltage[4]
2.4
–
V
Output HIGH
Document #: 38-07247 Rev. *E
IOH = –8 mA (–1, –2)
Page 4 of 9
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CY2304
Electrical Characteristics for CY2304SI-X Industrial Temperature Devices (continued)
Parameter
Description
Test Conditions
Min
Max
Unit
IDD (PD mode) Power down Supply Current REF = 0 MHz
–
25.0
μA
IDD
Unloaded outputs, 100 MHz, Select inputs
at VDD or GND
–
45.0
mA
Unloaded outputs, 66 MHz REF (–1, –2)
–
35.0
mA
Unloaded outputs, 33 MHz REF (–1, –2)
–
20.0
mA
Supply Current
Switching Characteristics for CY2304SI-X Industrial Temperature Devices
Parameter[5]
Name
Test Conditions
Min
Typ.
Max
Unit
t1
Output Frequency
30 pF load, All devices
10
100
MHz
t1
Output Frequency
15 pF load, All devices
10
133.3
MHz
Cycle[4]
tDC
Duty
(–1,–2)
t3
Rise Time[4]
(–1, –2)
t3
= t2 ÷ t1
40.0
50.0
60.0
%
Measured between 0.8V and 2.0V,
30 pF load
–
–
2.50
ns
Rise Time[4]
(–1, –2)
Measured between 0.8V and 2.0V,
15 pF load
–
–
1.50
ns
t4
Fall Time[4]
(–1, –2)
Measured between 0.8V and 2.0V,
30 pF load
–
–
2.50
ns
t4
Fall Time[4]
(–1, –2)
Measured between 0.8V and 2.0V,
15 pF load
–
–
1.50
ns
t5
Output-to-Output Skew on
same Bank (–1,–2)[4]
All outputs equally loaded
–
–
200
ps
Output Bank A to Output
Bank B Skew (–1)
All outputs equally loaded
–
–
200
ps
Output Bank A to Output
Bank B Skew (–2)
All outputs equally loaded
–
–
400
ps
t6
Skew, REF Rising Edge to
FBK Rising Edge[4]
Measured at VDD/2
–
0
±250
ps
t7
Device-to-Device Skew[4]
Measured at VDD/2 on the FBK pins of
devices
–
0
500
ps
tJ
Cycle-to-Cycle Jitter[4]
(–1)
Measured at 66.67 MHz, loaded outputs,
15 pF load
–
–
180
ps
Measured at 66.67 MHz, loaded outputs,
30 pF load
–
–
200
ps
Measured at 133.3 MHz, loaded outputs,
15 pF load
–
–
100
ps
Measured at 66.67 MHz, loaded outputs,
30 pF load
–
–
400
ps
Measured at 66.67 MHz, loaded outputs,
15 pF load
–
–
380
ps
Stable power supply, valid clocks
presented on REF and FBK pins
–
–
1.0
ms
tJ
tLOCK
Cycle-to-Cycle Jitter[4]
(–2)
PLL Lock Time[4]
Document #: 38-07247 Rev. *E
Measured at 1.4V, FOUT = 66.66 MHz,
30 pF load
Page 5 of 9
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CY2304
Switching Waveforms
Figure 2. Duty Cycle Timing
t1
t2
1.4V
1.4V
1.4V
Figure 3. All Outputs Rise/Fall Time
OUTPUT
2.0V
0.8V
2.0V
0.8V
3.3V
0V
t4
t3
Figure 4. Output-Output Skew
OUTPUT
1.4V
1.4V
OUTPUT
t5
Figure 5. Input-Output Skew
INPUT
VDD/2
VDD/2
FBK
t6
Figure 6. Device-Device Skew
VDD/2
FBK, Device 1
VDD/2
FBK, Device 2
t7
Document #: 38-07247 Rev. *E
Page 6 of 9
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CY2304
Figure 7. Test Circuit # 1
VDD
0.1 μF
OUTPUTS
CLK OUT
C LOAD
V DD
0.1 μF
GND
GND
Test circuit for all parameters except t8
Ordering Information
Ordering Code
CY2304SC–1
[6]
Package Type
8-pin 150-mil SOIC
Operating Range
Commercial
CY2304SC–1T[6]
8-pin 150-mil SOIC - Tape and Reel
Commercial
CY2304SI–1[6]
8-pin 150-mil SOIC
Industrial
CY2304SI–1T[6]
8-pin 150-mil SOIC- Tape and Reel
Industrial
CY2304SC–2[6]
8-pin 150-mil SOIC
Commercial
CY2304SC–2T[6]
8-pin 150-mil SOIC- Tape and Reel
Commercial
CY2304SXC–1
8-pin 150-mil SOIC
Commercial
CY2304SXC–1T
8-pin 150-mil SOIC - Tape and Reel
Commercial
CY2304SXI–1
8-pin 150-mil SOIC
Industrial
CY2304SXI–1T
8-pin 150-mil SOIC- Tape and Reel
Industrial
CY2304SXC–2
8-pin 150-mil SOIC
Commercial
CY2304SXC–2T
8-pin 150-mil SOIC- Tape and Reel
Commercial
CY2304SXI–2
8-pin 150-mil SOIC
Industrial
CY2304SXI–2T
8-pin 150-mil SOIC- Tape and Reel
Industrial
Pb-Free
Note
6. Not recommended for new designs.
Document #: 38-07247 Rev. *E
Page 7 of 9
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CY2304
Package Drawing and Dimensions
FigureS08
8. 8-Pin (150-Mil) SOIC S8
8 Lead (150 Mil) SOIC
PIN 1 ID
4
1
1. DIMENSIONS IN INCHES[MM] MIN.
MAX.
2. PIN 1 ID IS OPTIONAL,
ROUND ON SINGLE LEADFRAME
RECTANGULAR ON MATRIX LEADFRAME
0.150[3.810]
0.157[3.987]
3. REFERENCE JEDEC MS-012
0.230[5.842]
0.244[6.197]
4. PACKAGE WEIGHT 0.07gms
PART #
S08.15 STANDARD PKG.
5
SZ08.15 LEAD FREE PKG.
8
0.189[4.800]
0.196[4.978]
0.010[0.254]
0.016[0.406]
SEATING PLANE
X 45°
0.061[1.549]
0.068[1.727]
0.004[0.102]
0.050[1.270]
BSC
0.004[0.102]
0.0098[0.249]
0.0138[0.350]
0.0192[0.487]
Document #: 38-07247 Rev. *E
0°~8°
0.016[0.406]
0.035[0.889]
0.0075[0.190]
0.0098[0.249]
51-85066-*C
Page 8 of 9
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CY2304
Document History Page
Document Title: CY2304 3.3V Zero Delay Buffer
Document Number: 38-07247
REV.
ECN
Orig. of
Change
Submission
Date
**
110512
SZV
12/11/01
Description of Change
Change from Spec number: 38-01010 to 38-07247
*A
112294
CKN
03/04/02
On Pin Configuration Diagram (p.1), swapped CLKA2 and CLKA1
*B
113934
CKN
05/01/02
Added Operating Conditions for CY2304SI-X Industrial Temperature
Devices, p. 4
*C
121851
RBI
12/14/02
Power up requirements added to Operating Conditions Information
*D
308436
RGL
01/26/05
Added Lead-free Devices
*E
2542331
AESA
09/18/08
Updated template. Added Note “Not recommended for new designs.”
Removed part number CY2304SI-2 and CY2304SI-2T.
Changed Lead-Free to Pb-Free.
Changed IDD (PD mode) from 12.0 to 25.0 μA.
Deleted Duty Cycle parameters for FOUT < 50.0 MHz for commercial and
industrial devices.
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Document #: 38-07247 Rev. *E
Revised September 18, 2008
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