• 10-MHz to 100-/133-MHz operating range, compatible
with CPU and PCI bus frequencies
• Zero input-output propagation delay
• Multiple low-skew outputs
—Output-output skew less than 250 ps
—Device-device skew less than 700 ps
—One input drives five outputs (CY2305)
—One input drives nine outputs, group ed as 4 + 4 + 1
(CY2309)
• Less than 200 ps cycle-cycle jitter, compatible with
Pentium
-based systems
• Te st Mode to bypass phase-locked loop (PLL) (CY2309
only [see “Select Input Decoding” on page 2])
• Available in sp ac e-sa vin g 16-pin 150 -mil SOIC or
4.4-mm TSSOP p ack age s (CY2 309 ), a nd 8-pin , 1 50-m il
SOIC package (CY2305)
• 3.3V operation
• Industrial temperature available
Functional Description
The CY2309 is a low-cost 3.3V zero delay buffer designed to
distribute high-speed clocks and is avail able in a 16-p in SOIC
or TSSOP package. The CY2305 is an 8-pin version of the
CY2309. It accepts one reference input, and drives out five
low-skew clocks. The -1H versions of each device operate at
Block Diagram
PLL
REF
S2
Select Input
Decoding
S1
2309-1
MUX
up to 100-/133-MHz frequencies, and have higher drive than
the -1 devices. All parts have on-chip PLLs which lock to an
input clock on the REF pin. The PLL feedback is on-chip and
is obtained from the CLKOUT pad.
The CY2309 has two banks of four outputs each, which can
be controlled by the Sele ct inputs as shown in the “Select Input
Decoding” table on page 2. If all outp ut clocks are not required,
BankB can be three-stated. The select inputs also allow the
input clock to be directly app lied to the out puts for chip and
system testing purposes.
The CY2305 and CY2309 PLLs enter a power-down mode
when there are no rising ed ges on the R EF input. In this state,
the outputs are three-s tated and the PLL is turned of f, resulting
in less than 12.0 µA of current draw for commercial temperature devices and 25.0 µA for indus trial temperature p arts. The
CY2309 PLL shuts down in one additional case as shown in
the table below.
Multiple CY2305 and CY2309 devices can accept the same
input clock and di stribute it. In this case, the skew betwe en the
outputs of two devices is guaranteed to be less than 700 ps.
All outputs ha ve less than 20 0 ps of cycl e-cycle jitter . The input
to output propagation delay on both devices is guaranteed to
be less than 350 ps, and the output to output skew is
guaranteed to be less than 250 ps.
The CY2305/CY2309 is avai lable in two/thre e diff erent conf igurations, as shown in the ordering information (page 10). The
CY2305-1/CY2309-1 is the base part. The CY2305-1H/
CY2309-1H is the high-dri ve ve rsion of the - 1, and i ts rise a nd
fall times are much faster than the -1s.
Pin Configuration
SOIC/TSSOP
DD
S2
REF
CLK2
CLK1
GND
Top View
1
2
3
4
5
6
7
8
SOIC
Top View
1
2
3
4
16
15
14
13
12
11
10
9
8
7
6
5
CLKOUT
CLKA4
CLKA3
V
DD
GND
CLKB4
CLKB3
S1
CLKOUT
CLK4
V
DD
CLK3
2309-2
2309-3
CLKOUT
CLKA1
CLKA2
CLKA3
CLKA4
CLKB1
CLKB2
CLKB3
CLKB4
REF
CLKA1
CLKA2
V
GND
CLKB1
CLKB2
Cypress Semiconductor Corporation•3901 North First Street•San Jose, CA 95134•408-943-2600
Document #: 38-07140 Rev. *C Revised December 14, 2002
Pin Description for CY2309
PinSignalDescription
DD
[1]
Input reference frequency, 5V-tolerant inp ut
[2]
[2]
Buffered clock output, Bank A
Buffered clock output, Bank A
4. This output is driven and has an internal feedback for the PLL. The load on this output can be adjusted to change the skew between the reference and output.
[4]
Output SourcePLL Shutdown
Document #: 38-07140 Rev. *CPage 2 of 13
CY2305
CY2309
REF. Input to CLKA/CLKB Delay vs. Loading Difference between CLKOUT and CLKA/CLKB Pins
Zero Delay and Skew Control
All outputs should be uniformly loaded to achieve Zero Delay
between the input and output. Since the CLKOUT pin is the
internal feedback to the PLL , its relativ e loading can adj ust the
input-output delay. This is shown in the above graph.
For applications requiring zero input-output delay, all outputs,
including CLKOUT, must be equally loaded. Even if CLKOUT
is not used, it must have a capacitive load, equal to that on
other outputs, for obtaining zero input-output delay. If input to
output delay adjustmen ts are required, use the above graph to
calculate lo ading differences between the CLKOUT pin and
other outputs.
For zero output-output skew, be sure to load all outputs
equally. For further information refer to the application note
entitled “CY2305 and CY2309 as PCI and SDRAM Buffers.”
Document #: 38-07140 Rev. *CPage 3 of 13
Maximum Ratings
CY2305
CY2309
Supply Voltage to Ground Potential...............–0.5V to +7.0V
DC Input Voltage (Except REF) ............–0.5V to VDD + 0.5V
DC Input Voltage REF.........................................–0.5V to 7V
Storage Temperature .................................–65°C to +150°C
Operating Conditions for CY2305SC-XX and CY2309SC-XX Commercial Temperature Devices
ParameterDescriptionMin.Max.Unit
V
DD
T
A
C
L
C
L
C
IN
Supply Voltage3.03.6V
Operating Temperature (Ambient Temperature)070°C
Load Capacitance, below 100 MHz30pF
Load Capacitance, from 100 MHz to 133 MHz10pF
Input Capacitance7pF
Power-up time for all VDD's to reach minimum specified voltage
t
PU
(power ramps must be monotonic)0.0550ms
Electrical Characteristics for CY2305SC-XX and CY2309SC-XX Commercial Temperature Devices
ParameterDescriptionTest ConditionsMin.Max.Unit
[6]
DD
[5]
[5]
= 0V50.0µA
IN
[6]
[6]
DD
IOL = 8 mA (–1)
I
12 mA (–1H)
OH =
IOH = –8 mA (–1)
I
= –12 mA (–1H)
OL
2.0V
2.4V
0.8V
100.0µA
0.4V
32.0mA
SEL inputs at V
10-pF load
1
Measured at 1.4V, F
DD
10
10
= 66.67 MHz40.050.060.0%
out
100
133.33
[7]
MHz
MHz
Measured between 0.8V and 2.0V2.50ns
Measured between 0.8V and 2.0V2.50ns
[6]
All outputs equally loaded250ps
Measured at VDD/20±350ps
[6]
Measured at VDD/2. Measured in PLL
[6]
Bypass Mode, CY2309 device only.
[6]
Measured at VDD/2 on the CLKOUT pins
158.7ns
0700ps
of devices
Measured at 66 .67 MHz, load ed outp uts200ps
Stable power supply, valid clock
1.0ms
presented on REF pin
/2.
V
IL
V
IH
I
IL
I
IH
V
OL
V
OH
(PD mode)Power Down Supply CurrentREF = 0 MHz12.0µA
I
DD
I
DD
Input LOW Voltage
Input HIGH Voltage
Input LOW CurrentV
Input HIGH CurrentVIN = V
Output LOW Voltage
Output HIGH Voltage
Supply CurrentUnloaded outputs at 66.67 MHz,
Switching Characteristics for CY2305SC-1and CY2309SC-1 Commercial Temperature Devices
ParameterNameTest ConditionsMin.Typ.Max.Unit
t1Output Frequency30-pF load
[6]
Duty Cycle
t3Rise Time
t
4
t
5
t
6A
t
6B
t
7
t
J
t
LOCK
Notes:
5. REF input has a threshold voltage of V
6. Parameter is guaranteed by design and characterization. Not 100% tested in production.
7. All parameters specified with loaded outputs.
Fall Time
Output to Output Skew
Delay, REF Rising Edge to
CLKOUT Rising Edge
Delay, REF Rising Edge to
CLKOUT Rising Edge
Device to Device Skew
Cycle to Cycle Jitter
PLL Lock Time
= t2 ÷ t
[6]
[6]
[6]
Document #: 38-07140 Rev. *CPage 4 of 13
CY2305
CY2309
Switching Characteristics for CY2305SC- 1H and CY2309SC-1H Commercial Temper ature Devices
ParameterNameDescriptionMin.Typ.Max.Unit
t1Output Frequency30-pF load
10-pF load
[6]
Duty Cycle
Duty Cycle
t3Rise Time
t
4
t
5
t
6A
t
6B
t
7
t
8
t
J
t
LOCK
Fall Time
Output to Output Skew
Delay, REF Rising Edge to
CLKOUT Rising Edge
Delay, REF Rising Edge to
CLKOUT Rising Edge
Device to Device Skew
Output Slew Rate
Cycle to Cycle Jitter
PLL Lock Time
[6]
[6]
= t2 ÷ t
[6]
= t2 ÷ t
1
1
[6]
[6]
[6]
Measured at 1.4V, F
Measured at 1.4V, F
Measured between 0.8V and 2.0V1.50ns
Measured between 0.8V and 2.0V1.50ns
[6]
All outputs equally loaded250ps
Measured at VDD/20±350ps
[6]
Measured at VDD/2. Measured in PLL
[6]
Bypass Mode, CY2309 device only.
[6]
Measured at VDD/2 on the CLKOUT pins
of devices
Measured between 0.8V an d 2.0V using
Test Circuit #2
Measured at 66 .67 MHz, load ed outp uts200ps
Stable power supply, valid clock
presented on REF pin
= 66.67 MHz40.050.060.0%
out
<50.0 MHz45.050.055.0%
out
10
10
100
133.33
MHz
MHz
158.7ns
0700ps
1V/ns
1.0ms
Operating Conditions for CY2305SI-XX and CY2309SI-XX Industrial Temperature Devices
ParameterDescriptionMin.Max.Unit
V
DD
T
A
C
L
C
L
C
IN
Supply V ol t age3.03.6V
Operating Temperature (Ambient Temperature)–4085°C
Load Capacitance, below 100 MHz30pF
Load Capacitance, from 100 MHz to 133 MHz10pF
Input Capacitance7pF
[7]
Electrical Characteristics for CY230 5SI-XX and CY2309SI-XX Industrial Temperature Devices
ParameterDescriptionTest ConditionsMin.Max.Unit
V
IL
V
IH
I
IL
I
IH
V
OL
V
OH
Input LOW Voltage
Input HIGH Vo lt a ge
Input LOW CurrentV
Input HIGH CurrentVIN = V
Output LOW Voltage
Output HIGH Voltage
IDD (PD mode)Power Down Supply CurrentREF = 0 MHz25.0µA
I
DD
Supply CurrentUnloaded outputs at 66.67 MHz , SEL inputs at
Switching Characteristics for CY2305SI-1and CY2309SI-1 Industrial Temperature Devices
ParameterNameTest ConditionsMin.Typ.Max.Unit
t1Output Frequency30-pF load
[6]
[6]
[6]
= t2 ÷ t
Duty Cycle
t3Rise Time
t
4
Fall Time
[5]
[5]
= 0V50.0µA
IN
[6]
[6]
DD
IOL = 8 mA (-1)
=12 mA (-1H)
I
OH
IOH = –8 mA (-1)
= –12 mA (-1H)
I
OL
2.0V
2.4V
0.8V
100.0µA
0.4V
35.0mA
V
DD
[7]
10
10-pF load
1
Measured at 1.4V, F
= 66.67 MHz40.050.060.0%
out
10
100
133.33
MHz
MHz
Measured between 0.8V and 2.0V2.50ns
Measured between 0.8V and 2.0V2.50ns
Document #: 38-07140 Rev. *CPage 5 of 13
CY2305
CY2309
Switching Characteristics for CY2305SI-1and CY2309SI-1 Industrial Temperature Devices
[7]
ParameterNameTest ConditionsMin.Typ.Max.Unit
[6]
[6]
[6]
All outputs equally loaded250ps
Measured at VDD/20±350ps
Measured at VDD/2. Measured in
158.7ns
PLL Bypass Mode, CY2309 de vice
t
5
t
6A
t
6B
Output to Output Skew
Delay, REF Rising Edge to
CLKOUT Rising Edge
Delay, REF Rising Edge to
CLKOUT Rising Edge
only.
[6]
[6]
Measured at VDD/2 on the CLKOUT
pins of devices
Measured at 66.67 MHz, loaded
outputs
Stable power supply, valid clock
presented on REF pin
0700ps
200ps
1.0ms
t
7
t
J
t
LOCK
Device to Device Skew
Cycle to Cycle Jitter
PLL Lock Time
[6]
Switching Characteristics for CY2305SI-1H and CY2309SI-1H Industri al Temperature Devices
ParameterNameDescriptionMin.Typ.Max.Unit
t
1
t
3
t
4
t
5
t
6A
t
6B
t
7
t
8
t
J
t
LOCK
Output Frequency30-pF load
10-pF load
[6]
[6]
[6]
= t2 ÷ t
[6]
= t2 ÷ t
1
1
Measured at 1.4V , F
Measured at 1.4V, F
Measured between 0.8V and 2.0V1.50ns
Measured between 0.8V and 2.0V1.50ns
[6]
All outputs equally loa ded250ps
Measured at VDD/20±350ps
[6]
Measured at VDD/2. Measured in
[6]
PLL Bypass Mode, CY2309 dev ice
Duty Cycle
Duty Cycle
Rise Time
Fall Time
Output to Output Skew
Delay, REF Rising Edge to
CLKOUT Rising Edge
Delay, REF Rising Edge to
CLKOUT Rising Edge
only.
Device to Device Skew
[6]
Measured at VDD/2 on the CLKOUT
pins of devices
Output Slew Rate
[6]
Measured between 0.8V and 2.0V
using Test Circuit #2
Cycle to Cycle Jitter
[6]
Measured at 66.67 MHz, loaded
outputs
PLL Lock Time
[6]
Stable power supply, valid clock
presented on REF pin
10
10
= 66.67 MHz40.050.060.0%
out
< 50.0 MHz45.050.055.0%
out
100
133.33
158.7ns
0700ps
1V/ns
200ps
1.0ms
MHz
MHz
[7]
Switching Waveforms
Duty Cycle Timing
t
1
t
2
1.4V1.4V1.4V
Document #: 38-07140 Rev. *CPage 6 of 13
Switching Waveforms (continued)
All Outputs Rise/Fall Time
CY2305
CY2309
OUTPUT
2.0V2.0V
0.8V
t
3
Output-Output Skew
OUTPUT
OUTPUT
1.4V
t
5
1.4V
Input-Output Propagation Delay
/2
V
INPUT
OUTPUT
DD
t
VDD/2
6
0.8V
3.3V
0V
t
4
Device-Device Skew
CLKOUT, Device 1
CLKOUT, Device 2
VDD/2
t
7
V
/2
DD
Document #: 38-07140 Rev. *CPage 7 of 13
CY2305
Duty Cy cle Vs VDD
(for 30 pF Loads over Frequency - 3.3V, 25C)
40
42
44
46
48
50
52
54
56
58
60
33.13.23.33.43.53.6
VDD (V)
Duty Cycle (%)
33 MHz
66 MHz
100 MHz
Duty Cycle Vs Frequency
(for 30 pF L oads over Temperat u re - 3. 3V)
40
42
44
46
48
50
52
54
56
58
60
20406080100120140
Frequency (MHz)
Duty Cycle (%)
-40C
0C
25C
70C
85C
IDD vs Nu mber of Load ed Outputs
(for 30 pF Loads over Frequency - 3.3V, 25C)
0
20
40
60
80
100
120
140
0123456789
# of Loaded Outputs
IDD (mA)
33 MHz
66 MHz
100 MHz
CY2309
Typical Duty Cycle
[8]
and IDD Trends
[9]
for CY2305-1 and CY2309-1
(for 15 pF Loads over Frequency - 3.3V, 25C)
60
58
56
54
52
50
48
Duty Cycle (% )
46
44
42
40
33.13.23.33.43.53.6
(for 15 pF L o ads over Temperatur e - 3.3V)
60
58
56
54
52
50
48
Duty Cycle (%)
46
44
42
40
20406080100120140
Duty Cycle Vs VDD
33 MHz
66 MHz
100 MHz
133 MHz
VDD (V)
Duty Cycle Vs F r equency
-40C
0C
25C
70C
85C
Frequency (MHz)
Notes:
8. Duty Cycle is taken from typical chip measured at 1.4V.
9. I
data is calculated from I
DD
Voltage (V); f = frequency (Hz)).
Document #: 38-07140 Rev. *CPage 8 of 13
DD
= I
CORE
+ nCVf, where I
IDD vs Number of Loaded Outputs
(for 15 pF Loads over Frequency - 3.3V, 25C)
140
120
100
80
60
IDD (mA)
40
20
0
0123456789
# of Loade d Outpu ts
is the unloaded current. (n = # of outputs; C = Capacitance load per output (F); V = Supply
CORE
33 MHz
66 MHz
100 MHz
CY2305
Duty Cy cle Vs VD D
(for 30 pF Loads ove r Frequency - 3.3V, 25C)
40
42
44
46
48
50
52
54
56
58
60
33.13.23.33.43.53.6
VDD (V)
Duty Cycle (%)
33 MHz
66 MHz
100 MHz
Duty Cycle Vs Frequency
(for 30 pF Loads over Temperature - 3.3V)
40
42
44
46
48
50
52
54
56
58
60
20406080100120140
Frequency (MHz)
Duty Cycle (%)
-40C
0C
25C
70C
85C
IDD vs Number of Loaded Outputs
(for 30 pF Loads over Frequency - 3.3V, 25C)
0
20
40
60
80
100
120
140
160
0123456789
# of Loaded Outputs
IDD (mA)
33 MHz
66 MHz
100 MHz
CY2309
Typical Duty Cycle
[8]
and IDD Trends
[9]
for CY2305-1H and CY2309-1H
(for 15 pF Loads over Frequency - 3.3V, 25C)
60
58
56
54
52
50
48
Duty Cycle (%)
46
44
42
40
33.13.23.33.43.53.6
(for 15 pF Loads over Temperature - 3.3V)
60
58
56
54
52
50
48
Duty Cycle (%)
46
44
42
40
20406080100120140
Duty Cycle Vs VDD
33 M Hz
66 M Hz
100 MHz
133 MHz
VDD (V)
Duty Cycle Vs Frequency
-40C
0C
25C
70C
85C
Frequency (MHz)
Document #: 38-07140 Rev. *CPage 9 of 13
IDD vs Number of Loaded Outputs
(for 15 pF Loads over Frequency - 3.3V, 25C)
160
140
120
100
80
IDD (mA)
60
40
20
0
0123456789
# of Loaded Outputs
33 MHz
66 MHz
100 MHz
Test Circuits
CY2305
CY2309
Test Circuit # 2
V
DD
OUTPUTS
V
DD
GND
(output slew rate) on -1H devices
8
GND
1 kΩ
1 kΩ
0.1 µF
0.1 µF
Test Circuit # 1
V
DD
OUTPUTS
V
DD
GND
GND
CLK
out
C
0.1 µF
LOAD
0.1 µF
For parameter t
Ordering Information
Ordering CodePackage TypeOperating Range
CY2305SC-18-pin 150-mil SOICCommercial
CY2305SC-1T8-pin 150-mil SOIC–Tape and ReelCommercial
CY2305SI-18-pin 150-mil SOICIndustrial
CY2305SI-1T8-pin 150-mil SOIC–Tape and ReelIndustrial
CY2305SC-1H8-pin 150-mil SOICCommercial
CY2305SC-1HT8-pin 150-mil SOIC–Tape and ReelCommercial
CY2305SI-1H8-pin 150-mil SOICIndustrial
CY2305SI-1HT8-pin 150-mil SOIC–Tape and ReelIndustrial
CY2305ZC-18-pin 150-mil TSSOPCommercial
CY2305ZC-1T8-pin 150-mil TSSOP–Tape and ReelCommercial
CY2309SC-116-pin 150-mil SOICCommercial
CY2309SC-1T16-pin 150-mil SOIC–Tape and ReelCommercial
CY2309SI-116-pin 150-mil SOICIndustrial
CY2309SI-1T16-pi n 150-mil SOIC–Tape and ReelIndustrial
CY2309SC-1H16-pin 150-mil SOICCommercial
CY2309SC-1HT16-pin 150-mil SOIC–Tape and ReelCommercial
CY2309SI-1H16-pin 150-mil SOICIndustrial
CY2309SI-1HT16-pin 150-mil SOIC–Tape and ReelIndustrial
CY2309ZC-1H16-pin 4.4-mm TSSOPCommercial
CY2309ZC-1HT16-pin 4.4-mm TSSOP–Tape and ReelCommercial
CY2309ZI-1H16-pin 4.4-mm TSSO PIndustrial
CY2309ZI-1HT16-pin 4.4-mm TSSO P–Tape and ReelIndustrial
10 pF
Document #: 38-07140 Rev. *CPage 10 of 13
Package Diagrams
CY2305
CY2309
8-lead (150-Mil) SOIC S8
16-lead (150-Mil) Molded SOIC S16
51-85066-A
51-85068-A
Document #: 38-07140 Rev. *CP age 11 of 13
Package Diagrams (continued)
16-lead Thin Shrunk Small Outline Package (4.40 MM Body) Z16
CY2305
CY2309
51-85091-**
Pentium is a regi ste red trad em ark of Inte l C o rpora tion. All product an d c om p an y nam es m enti on ed in this document may b e th e
trademark s of their respective hol ders.
**11024910/19/01SZVChange from Spec number: 38-00530 to 38-07140
*A11111703/01/02CKNAdded t6B row to the Switching Characteristics Table; also added the letter
*B11762510/21/02HWTAdded eight-pin TSSOP packages (CY2305ZC-1 and CY2305ZC-1T) to the
*C12182812/14/02RBIPower up requirements added to Operating Conditions Information
Orig. of
ChangeDescription of Change
“A” to the t6A row
Corrected the table title from CY2305SC-IH and CY2309SC-IH to
CY2305SI-IH and CY2309SI-IH
ordering information table.
Added the Tape and Reel option to all the existing packages:
CY2305SC-1T, CY2305SI-1T, CY2305SC-1HT, CY2305SI-1HT,
CY2305ZC-1T, CY2309SC-1T, CY2309SI-1T, CY2309SC-1HT,
CY2309SI-1HT, CY2309ZC-1HT, CY2309ZI-1HT
Document #: 38-07140 Rev. *CPage 13 of 13
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