2.5V or 3.3V, 200-MHz, 14 Output Zero Delay Buffer
CY29775
Cypress Semiconductor Corporation
·
3901 North First Street
·
San Jose
·
CA 95134
·
408-943-2600
Document #: 38-07480 Rev. **
Revised April 28, 2003
775
Features
· Output frequency range: 8.3 MHz to 200 MHz
· Input frequency range: 4.2 MHz to 125 MHz
· 2.5V or 3.3V operation
· Split 2.5V/3.3V outputs
· 14 Clock outputs: Drive up to 28 clock lines
· 1 Feedback clock output
· 2 LVCMOS reference clock inputs
· 150 ps max output-output skew
· PLL bypass mode
· Spread AwareTM
· Output enable/disable
· Industrial temperature range: 40°C to +85°C
· 52-Pin 1.0-mm TQFP package
Description
The CY29775 is a low-voltage high-performance 200-MHz
PLL-based zero delay buffer designed for high-speed clock
distribution applications.
The CY29775 features two reference clock inputs and pro-
vides 14 outputs partitioned in 3 banks of 5, 5, and 4 outputs.
Bank A and Bank B divide the VCO output by 4 or 8 while Bank
C divides by 8 or 12 per SEL(A:C) settings, see Functional
Table. These dividers allow output to input ratios of 6:1, 4:1,
3:1, 2:1, 3:2, 4:3, 1:1, and 2:3. Each LVCMOS compatible out-
put can drive 50
series or parallel terminated transmission
lines. For series terminated transmission lines, each output
can drive one or two traces giving the device an effective
fanout of 1:28.
The PLL is ensured stable given that the VCO is configured to
run between 200 MHz to 500 MHz. This allows a wide range
of output frequencies from 8.3 MHz to 200 MHz. For normal
operation, the external feedback input, FB_IN, is connected to
the feedback output, FB_OUT. The internal VCO is running at
multiples of the input reference clock set by the feedback di-
vider, see Frequency Table.
When PLL_EN is LOW, PLL is bypassed and the reference
clock directly feeds the output dividers. This mode is fully static
and the minimum input clock frequency specification does not
apply.
Block Diagram
Pin Configuration
P L L
20 0 -
5 00M H z
÷
2 /
÷
4
÷
4 /
÷
6 /
÷
8 /
÷
12
Q A 0
Q B 0
Q C 0
F B _O U T
S E L A
V C O _ S E L(1 ,0)
T C LK 0
T C LK _ S E L
F B _IN
S E LB
S E LC
M R #/O E
F B _S E L(1,0)
T C LK 1
÷
2
C L K
S TO P
÷
2 /
÷
4
C L K
S T O P
÷
4 /
÷
6
C L K
S T O P
C LK _ S T P #
Q A 1
Q A 2
Q A 3
Q A 4
Q B 1
Q B 2
Q B 3
Q B 4
Q C 1
Q C 2
Q C 3
P L L_ E N
÷
4
V SS
MR#/OE
CLK_STP#
SELB
SELC
PLL_EN
SELA
TCLK_SEL
TCLK0
TCLK1
V CO_SEL1
V DD
A V DD
V
DDQ
A
QA
0
VSS
QA
1
V
DDQ
A
QA
2
F
B
_
SEL
1
VSS
QA
3
V
DDQ
A
QA
4
AVSS
F
B
_
SEL
0
QB
0
V
DDQ
B
NC
VSS
QC
3
V
DDQ
C
QC
2
VSS
QC
1
V
DDQ
C
QC
0
VSS
VC
O
_
SEL
0
V SS
QB1
V DDQB
QB2
V SS
QB3
V DDQB
QB4
FB_IN
V SS
FB_OUT
V DDFB
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
39
38
37
36
35
34
33
32
31
30
29
28
27
14 15 16 17 18 19 20 21 22 23 24 25 26
52 51 50 49 48 47 46 45 44 43 42 41 40
CY29775
CY29775
Document #: 38-07480 Rev. **
Page 2 of 10
Notes:
1.
PU = Internal pull-up, PD = Internal pull-down
2.
A 0.1-
µ
F bypass capacitor should be placed as close as possible to each positive power pin (<0.2"). If these bypass capacitors are not close to the pins their
high frequency filtering characteristics will be cancelled by the lead inductance of the traces.
3.
AVDD and VDD pins must be connected to a power supply level that is at least equal or higher than that of VDDQA, VDDQB, VDDQC, and VDDFB power supply
pins.
Pin Description
[1]
Pin
Name
I/O
Type
Description
9
TCLK0
I, PD
LVCMOS
LVCMOS/LVTTL reference clock input
10
TCLK1
I, PU
LVCMOS
LVCMOS/LVTTL reference clock input
16, 18, 21,
23, 25
QA(4:0)
O
LVCMOS
Clock output bank A
32, 34, 36,
38, 40
QB(4:0)
O
LVCMOS
Clock output bank B
44, 46, 48,
50
QC(3:0)
O
LVCMOS
Clock output bank C
29
FB_OUT
O
LVCMOS
Feedback clock output. Connect to FB_IN for normal operation.
31
FB_IN
I, PU
LVCMOS
Feedback clock input. Connect to FB_OUT for normal operation.
This input should be at the same voltage rail as input reference clock.
See Table 1.
2
MR#/OE
I, PU
LVCMOS
Output enable/disable input. See Table 2.
3
CLK_STP#
I, PU
LVCMOS
Clock stop enable/disable input. See Table 2.
6
PLL_EN
I, PU
LVCMOS
PLL enable/disable input. See Table 2.
8
TCLK_SEL
I, PD
LVCMOS
Reference select input. See Table 2.
11, 52
VCO_SEL(1,0)
I, PD
LVCMOS
VCO divider select input. See Tables 2, 3 and 4.
7, 4, 5
SEL(A:C)
I, PD
LVCMOS
Frequency select input, Bank (A:C). See Table 3.
20, 14
FB_SEL(1,0)
I, PD
LVCMOS
Feedback dividers select inputs. See Table 4.
17, 22, 26
VDDQA
Supply
VDD
2.5V or 3.3V Power supply for bank A output clocks
[2,3]
33, 37, 41
VDDQB
Supply
VDD
2.5V or 3.3V Power supply for bank B output clocks
[2,3]
45, 49
VDDQC
Supply
VDD
2.5V or 3.3V Power supply for bank C output clocks
[2,3]
28
VDDFB
Supply
VDD
2.5V or 3.3V Power supply for feedback output clock
[2,3]
13
AVDD
Supply
VDD
2.5V or 3.3V Power supply for PLL
[2,3]
12
VDD
Supply
VDD
2.5V or 3.3V Power supply for core and inputs
[2,3]
15
AVSS
Supply
Ground
Analog Ground
1, 19, 24,
30, 35, 39,
43, 47, 51
VSS
Supply
Ground
Common Ground
27, 42
NC
No Connection
CY29775
Document #: 38-07480 Rev. **
Page 3 of 10
Table 1. Frequency Table
Feedback Output
Divider
VCO
Input Frequency Range
(AVDD = 3.3V)
Input Frequency Range
(AVDD = 2.5V)
÷
8
Input Clock * 8
25 MHz to 62.5 MHz
25 MHz to 50 MHz
÷
12
Input Clock * 12
16.6 MHz to 41.6 MHz
16.6 MHz to 33.3 MHz
÷
16
Input Clock * 16
12.5 MHz to 31.25 MHz
12.5 MHz to 25 MHz
÷
24
Input Clock * 24
8.3 MHz to 20.8 MHz
8.3 MHz to 16.6 MHz
÷
32
Input Clock * 32
6.25 MHz to 15.625 MHz
6.25 MHz to 12.5 MHz
÷
48
Input Clock * 48
4.2 MHz to 10.4 MHz
4.2 MHz to 8.3 MHz
÷
4
Input Clock * 4
50 MHz to 125 MHz
50 MHz to 100 MHz
÷
6
Input Clock * 6
33.3 MHz to 83.3 MHz
33.3 MHz to 66.6 MHz
÷
8
Input Clock * 8
25 MHz to 62.5 MHz
25 MHz to 50 MHz
÷
12
Input Clock * 12
16.6 MHz to 41.6 MHz
16.6 MHz to 33.3 MHz
Table 2. Function Table (configuration controls)
Control
Default
0
1
TCLK_SEL
0
TCLK0
TCLK1
VCO_SEL0
0
VCO
÷
2 (mid input frequency range)
VCO
÷
4 (low input frequency range)
VCO_SEL1
0
Gated by VCO_SEL0
VCO (high input frequency range)
PLL_EN
1
Bypass mode, PLL disabled. The input clock
connects to the output dividers
PLL enabled. The VCO output
connects to the output dividers
MR#/OE
1
Outputs disabled (three-state) and reset of the
device. During reset/output disable the PLL feedback
loop is open and the VCO running at its minimum
frequency. The device is reset by the internal
power-on reset (POR) circuitry during power-up.
Outputs enabled
CLK_STP#
1
QA, QB, and QC outputs disabled in LOW state.
FB_OUT is not affected by CLK_STP#.
Outputs enabled
Table 3. Function Table (Bank A, B, and C)
VCO_SEL1
VCO_SEL0
SELA
QA(4:0)
SELB
QB(4:0)
SELC
QC(3:0)
0
0
0
÷
4
0
÷
4
0
÷
8
0
0
1
÷
8
1
÷
8
1
÷
12
0
1
0
÷
8
0
÷
8
0
÷
16
0
1
1
÷
16
1
÷
16
1
÷
24
1
x
0
÷
2
0
÷
2
0
÷
4
1
x
1
÷
4
1
÷
4
1
÷
6
CY29775
Document #: 38-07480 Rev. **
Page 4 of 10
Table 4. Function Table (FB_OUT)
VCO_SEL1
VCO_SEL0
FB_SEL1
FB_SEL0
FB_OUT
0
0
0
0
÷
8
0
0
0
1
÷
16
0
0
1
0
÷
12
0
0
1
1
÷
24
0
1
0
0
÷
16
0
1
0
1
÷
32
0
1
1
0
÷
24
0
1
1
1
÷
48
1
x
0
0
÷
4
1
x
0
1
÷
8
1
x
1
0
÷
6
1
x
1
1
÷
12
Absolute Maximum Conditions
Parameter
Description
Condition
Min.
Max.
Unit
V
DD
DC Supply Voltage
0.3
5.5
V
V
DD
DC Operating Voltage
Functional
2.375
3.465
V
V
IN
DC Input Voltage
Relative to V
SS
0.3
V
DD
+ 0.3
V
V
OUT
DC Output Voltage
Relative to V
SS
0.3
V
DD
+ 0.3
V
V
TT
Output termination Voltage
V
DD
÷
2
V
LU
Latch Up Immunity
Functional
200
mA
R
PS
Power Supply Ripple
Ripple Frequency < 100 kHz
150
mVp-p
T
S
Temperature, Storage
Non Functional
65
+150
°C
T
A
Temperature, Operating Ambient
Functional
40
+85
°C
T
J
Temperature, Junction
Functional
150
°C
Ø
JC
Dissipation, Junction to Case
Functional
23
°C/W
Ø
JA
Dissipation, Junction to Ambient
Functional
55
°C/W
ESD
H
ESD Protection (Human Body Model)
2000
Volts
FIT
Failure in Time
Manufacturing test
10
ppm
CY29775
Document #: 38-07480 Rev. **
Page 5 of 10
Notes:
4.
Driving one 50
parallel terminated transmission line to a termination voltage of V
TT
. Alternatively, each output drives up to two 50
series terminated trans-
mission lines.
5.
Inputs have pull-up or pull-down resistors that affect the input current.
DC Electrical Specifications
(V
DD
= 3.3V ± 5%, T
A
= 40°C to +85°C)
Parameter
Description
Condition
Min.
Typ.
Max.
Unit
V
IL
Input Voltage, Low
LVCMOS
0.8
V
V
IH
Input Voltage, High
LVCMOS
2.0
V
DD
+0.3
V
V
OL
Output Voltage, Low
[4]
I
OL
= 24 mA
0.55
V
I
OL
= 12 mA
0.30
V
OH
Output Voltage, High
[4]
I
OH
= 24 mA
2.4
V
I
IL
Input Current, Low
[5]
V
IL
= V
SS
100
µ
A
I
IH
Input Current, High
[5]
V
IL
= V
DD
100
µ
A
I
DDA
PLL Supply Current
A
VDD
only
5
10
mA
I
DDQ
Quiescent Supply Current
All V
DD
pins except A
VDD
1
mA
I
DD
Dynamic Supply Current
Outputs loaded @ 100 MHz
225
mA
Outputs loaded @ 200 MHz
290
C
IN
Input Pin Capacitance
4
pF
Z
OUT
Output Impedance
12
15
18
DC Electrical Specifications
(V
DD
= 2.5V ± 5%, T
A
= 40°C to +85°C)
Parameter
Description
Condition
Min.
Typ.
Max.
Unit
V
IL
Input Voltage, Low
LVCMOS
0.7
V
V
IH
Input Voltage, High
LVCMOS
1.7
V
DD
+0.3
V
V
OL
Output Voltage, Low
[4]
I
OL
= 15 mA
0.6
V
V
OH
Output Voltage, High
[4]
I
OH
= 15 mA
1.8
V
I
IL
Input Current, Low
[5]
V
IL
= V
SS
100
µ
A
I
IH
Input Current, High
[5]
V
IL
= V
DD
100
µ
A
I
DDA
PLL Supply Current
A
VDD
only
5
10
mA
I
DDQ
Quiescent Supply Current
All V
DD
pins except A
VDD
1
mA
I
DD
Dynamic Supply Current
Outputs loaded @ 100 MHz
135
mA
Outputs loaded @ 200 MHz
160
C
IN
Input Pin Capacitance
4
pF
Z
OUT
Output Impedance
14
18
22
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