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CDC2509A
3.3-V PHASE-LOCK LOOP CLOCK DRIVER
SCAS603A – APRIL 1998 – REVISED JUNE 1998
AGND
V
CC
1Y0
1Y1
1Y2
GND
GND
1Y3
1Y4
V
CC
1G
PW PACKAGE
(TOP VIEW)
1
24
2
23
3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
CLK
AV
CC
V
CC
2Y0
2Y1
GND
GND
2Y2
2Y3
V
CC
2G
FBIN
D
Spread Spectrum Clock Compatible
D
100 MHz Maximum Frequency
D
Available in Plastic 24-Pin TSSOP
D
Phase-Lock Loop Clock Distribution for
Synchronous DRAM Applications
D
Distributes One Clock Input to One Bank of
Five and One Bank of Four Outputs
D
Separate Output Enable for Each Output
Bank
D
External Feedback (FBIN) Pin Is Used to
Synchronize the Outputs to the Clock Input
D
On-Chip Series Damping Resistors
D
No External RC Network Required
D
Operates at 3.3-V V
CC
FBOUT
description
The CDC2509A is a high-performance, low-skew, low-jitter, phase-lock loop (PLL) clock driver. It uses a PLL
to precisely align, in both frequency and phase, the feedback (FBOUT) output to the clock (CLK) input signal.
It is specifically designed for use with synchronous DRAMs. The CDC2509A operates at 3.3-V VCC and provides
integrated series-damping resistors that make it ideal for driving point-to-point loads.
One bank of five outputs and one bank of four outputs provide nine low-skew , low-jitter copies of CLK. Output
signal duty cycles are adjusted to 50 percent, independent of the duty cycle at CLK. Each bank of outputs can
be enabled or disabled separately via the control (1G and 2G) inputs. When the G inputs are high, the outputs
switch in phase and frequency with CLK; when the G inputs are low, the outputs are disabled to the logic-low
state.
Unlike many products containing PLLs, the CDC2509A does not require external RC networks. The loop filter
for the PLL is included on-chip, minimizing component count, board space, and cost.
Because it is based on PLL circuitry , the CDC2509A requires a stabilization time to achieve phase lock of the
feedback signal to the reference signal. This stabilization time is required, following power up and application
of a fixed-frequency, fixed-phase signal at CLK, and following any changes to the PLL reference or feedback
signals. The PLL can be bypassed for test purposes by strapping AV
to ground.
CC
The CDC2509A is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
1G 2G CLK
X X L L L L
L LHLLH
L HHLHH
H LHHLH
H H H H H H
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
OUTPUTS
1Y
(0:4)2Y(0:3)
FBOUT
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Copyright 1998, Texas Instruments Incorporated
1
CDC2509A
3.3-V PHASE-LOCK LOOP CLOCK DRIVER
SCAS603A – APRIL 1998 – REVISED JUNE 1998
functional block diagram
11
1G
14
2G
21
3
1Y0
4
1Y1
5
1Y2
8
1Y3
9
1Y4
2Y0
CLK
FBIN
AV
CC
24
13
23
PLL
AVAILABLE OPTIONS
PACKAGE
T
A
0°C to 70°C CDC2509APWR
SMALL OUTLINE
(PW)
20
17
16
12
2Y1
2Y2
2Y3
FBOUT
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPE
DESCRIPTION
3.3-V PHASE-LOCK LOOP CLOCK DRIVER
SCAS603A – APRIL 1998 – REVISED JUNE 1998
Terminal Functions
TERMINAL
NAME NO.
Clock input. CLK provides the clock signal to be distributed by the CDC2509A clock driver. CLK is used
to provide the reference signal to the integrated PLL that generates the clock output signals. CLK must
CLK 24 I
FBIN 13 I
1G 11 I
2G 14 I
FBOUT 12 O
1Y (0:4) 3, 4, 5, 8, 9 O
2Y (0:3) 16, 17, 20, 21 O
AV
CC
AGND 1 Ground Analog ground. AGND provides the ground reference for the analog circuitry.
V
CC
GND 6, 7, 18, 19 Ground Ground
23 Power
2, 10, 15, 22 Power Power supply
have a fixed frequency and fixed phase for the PLL to obtain phase lock. Once the circuit is powered
up and a valid CLK signal is applied, a stabilization time is required for the PLL to phase lock the
feedback signal to its reference signal.
Feedback input. FBIN provides the feedback signal to the internal PLL. FBIN must be hard-wired to
FBOUT to complete the PLL. The integrated PLL synchronizes CLK and FBIN so that there is nominally
zero phase error between CLK and FBIN.
Output bank enable. 1G is the output enable for outputs 1Y(0:4). When 1G is low, outputs 1Y(0:4) are
disabled to a logic-low state. When 1G is high, all outputs 1Y(0:4) are enabled and switch at the same
frequency as CLK.
Output bank enable. 2G is the output enable for outputs 2Y(0:3). When 2G is low, outputs 2Y(0:3) are
disabled to a logic low state. When 2G is high, all outputs 2Y(0:3) are enabled and switch at the same
frequency as CLK.
Feedback output. FBOUT is dedicated for external feedback. It switches at the same frequency as CLK.
When externally wired to FBIN, FBOUT completes the feedback loop of the PLL. FBOUT has and
integrated 25-Ω series-damping resistor .
Clock outputs. These outputs provide low-skew copies of CLK. Output bank 1Y(0:4) is enabled via the
1G input. These outputs can be disabled to a logic-low state by deasserting the 1G control input. Each
output has an integrated 25-Ω series-damping resistor.
Clock outputs. These outputs provide low-skew copies of CLK. Output bank 2Y(0:3) is enabled via the
2G input. These outputs can be disabled to a logic-low state by deasserting the 2G control input. Each
output has an integrated 25-Ω series-damping resistor.
Analog power supply . AVCC provides the power reference for the analog circuitry. In addition, A VCC can
be used to bypass the PLL for test purposes. When AVCC is strapped to ground, PLL is bypassed and
CLK is buffered directly to the device outputs.
CDC2509A
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
3
CDC2509A
3.3-V PHASE-LOCK LOOP CLOCK DRIVER
SCAS603A – APRIL 1998 – REVISED JUNE 1998
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, AV
Supply voltage range, VCC –0.5 V to 4.6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, VI (see Note 2) –0.5 V to 6.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the high or low state,
VO (see Notes 2 and 3) –0.5 V to VCC + 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, I
IK
Output clamp current, I
Continuous output current, I
Continuous current through each VCC or GND ±100 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum power dissipation at TA = 55°C (in still air) (see Note 4) 0.7 W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. AVCC must not exceed VCC.
2. The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.
3. This value is limited to 4.6 V maximum.
4. The maximum package power dissipation is calculated using a junction temperature of 150°C and a board trace length of 750 mils.
For more information, refer to the
Book
, literature number SCBD002.
(see Note 1) AVCC < VCC +0.7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CC
(V
< 0) –50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I
(V
OK
< 0 or VO > VCC) ±50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O
(V
= 0 to VCC) ±50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O
O
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
stg
Package Thermal Considerations
application note in the
ABT Advanced BiCMOS T echnology Data
recommended operating conditions (see Note 5)
MIN MAX UNIT
VCC, AVCCSupply voltage 3 3.6 V
V
IH
V
IL
V
I
I
OH
I
OL
T
A
NOTE 5: Unused inputs must be held high or low to prevent them from floating.
High-level input voltage 2 V
Low-level input voltage 0.8 V
Input voltage 0 V
High-level output current –12 mA
Low-level output current 12 mA
Operating free-air temperature 0 70 °C
CC
V
†
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
(INPUT)/CONDITION
(OUTPUT)
CDC2509A
3.3-V PHASE-LOCK LOOP CLOCK DRIVER
SCAS603A – APRIL 1998 – REVISED JUNE 1998
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER TEST CONDITIONS VCC, AV
V
IK
V
OH
V
OL
I
I
§
I
CC
∆I
CC
C
i
C
‡
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
§
For ICC of AVCC, see Figure 5.
o
II = –18 mA 3 V –1.2 V
IOH = –100 µA MIN to MAX VCC–0.2
IOH = –12 mA 3 V 2.1
IOH = –6 mA 3 V 2.4
IOL = 100 µA MIN to MAX 0.2
IOL = 12 mA 3 V 0.8
IOL = 6 mA 3 V 0.55
VI = VCC or GND 3.6 V ±5 µA
VI = VCC or GND, IO = 0, Outputs: low or high 3.6 V 10 µA
One input at VCC – 0.6 V, Other inputs at VCC or GND 3.3 V to 3.6 V 500 µA
VI = VCC or GND 3.3 V 4 pF
VO = VCC or GND 3.3 V 6 pF
CC
MIN TYP‡MAX UNIT
V
V
timing requirements over recommended ranges of supply voltage and operating free-air
temperature
MIN MAX UNIT
f
clk
†
Time required for the integrated PLL circuit to obtain phase lock of its feedback signal to its reference signal. For phase lock to be obtained, a
fixed-frequency , fixed-phase reference signal must be present at CLK. Until phase lock is obtained, the specifications for propagation delay, skew ,
and jitter parameters given in the switching characteristics table are not applicable. This parameter does not apply for input modulation under
SSC application.
Clock frequency 80 100 MHz
Input clock duty cycle 40% 60%
Stabilization time
†
1 ms
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, C
PARAMETER
t
phase error
(see Note 7, Figure 3)
t
phase error
(see Note 8)
t
sk(o)
Jitter
(see Figure 4)
Duty cycle F(clkin > 80 MHz) Any Y or FBOUT 45% 55%
t
r
t
f
‡
These parameters are not production tested.
§
The t
NOTES: 6. The specifications for parameters in this table are applicable only after any appropriate stabilization time has elapsed.
, reference
, – jitter
§
(pk-pk)
specification is only valid for equal loading of all outputs.
sk(o)
7. This is considered as static phase error.
8. Phase error does not include jitter. The total phase error is –900 ps to –200 ps for the 5% VCC range.
= 30 pF (see Note 6 and Figures 1 and 2)
L
FROM
80 MHz < CLKIN↑ ≤ 100 MHz FBIN↑ –700 –300 ps
CLKIN↑ = 100 MHz FBIN↑ –750 –350 –540 ps
Any Y or FBOUT Any Y or FBOUT 200 ps
Clkin = 100 MHz Any Y or FBOUT –150 150 ps
TO
Any Y or FBOUT 1.3 1.9 0.8 2.1 ns
Any Y or FBOUT 1.7 2.5 1.2 2.7 ns
‡
VCC, AVCC = 3.3 V
± 0.165 V
MIN TYP MAX MIN TYP MAX
VCC, AVCC = 3.3 V
± 0.3 V
UNIT
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
5
CDC2509A
3.3-V PHASE-LOCK LOOP CLOCK DRIVER
SCAS603A – APRIL 1998 – REVISED JUNE 1998
PARAMETER MEASUREMENT INFORMATION
From Output
Under Test
500
30 pF
W
Input
Output
3 V
50% V
CC
t
pd
t
r
0.4 V
2 V
50% V
CC
2 V
t
f
0.4 V
0 V
V
V
OH
OL
LOAD CIRCUIT FOR OUTPUTS
NOTES: A. CL includes probe and jig capacitance.
B. All input pulses are supplied by generators having the following characteristics: PRR ≤ 100 MHz, ZO = 50 Ω, tr ≤ 1.2 ns, tf≤ 1.2 ns.
C. The outputs are measured one at a time with one transition per measurement.
Figure 1. Load Circuit and Voltage Waveforms
CLKIN
FBIN
t
phase error
FBOUT
Any Y
t
sk(o)
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
Any Y
Any Y
t
sk(o)
Figure 2. Phase Error and Skew Calculations
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
CDC2509A
3.3-V PHASE-LOCK LOOP CLOCK DRIVER
SCAS603A – APRIL 1998 – REVISED JUNE 1998
TYPICAL CHARACTERISTICS
STATIC PHASE ERROR
–300
–350
–400
–450
–500
–550
–600
Static Phase Error – ps
–650
–700
–750
AVCC, VCC = 3.3 V
TA = 25°C
60 70 80 90 120110100
f
clk
vs
CLOCK FREQUENCY
– Clock Frequency – MHz
Figure 3
14
AVCC, VCC = 3.3 V
TA = 25°C
12
550
500
450
400
350
300
250
Jitter (Peak-to-Peak) – ps
200
150
130
100
60 70 80 90 120110100
ANALOG SUPPLY CURRENT
vs
CLOCK FREQUENCY
JITTER (PEAK-TO-PEAK)
vs
CLOCK FREQUENCY
AVCC, VCC = 3.3 V
RL = 500 Ω
CL = 30 pF
TA = 25°C
All Outputs Switching
f
– Clock Frequency – MHz
clk
Figure 4
130
10
8
6
4
– Analog Supply Current – mA
CC
2
AI
0
30 50 70 90 110
f
– Clock Frequency – MHz
clk
Figure 5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
130
7
CDC2509A
3.3-V PHASE-LOCK LOOP CLOCK DRIVER
SCAS603A – APRIL 1998 – REVISED JUNE 1998
MECHANICAL INFORMATION
PW (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE
14 PIN SHOWN
0,65
14
1
1,20 MAX
A
7
0,05 MIN
0,30
0,19
8
4,50
4,30
6,60
6,20
M
0,10
Seating Plane
0,10
0,15 NOM
Gage Plane
0,25
0°–8°
0,75
0,50
PINS **
DIM
A MAX
A MIN
NOTES: A. All linear dimensions are in millimeters.
B. This drawing is subject to change without notice.
C. Body dimensions do not include mold flash or protrusion not to exceed 0,15.
D. Falls within JEDEC MO-153
8
3,10
2,90
14
5,10
4,90
16
5,10
20
6,60
6,404,90
24
7,90
7,70
28
9,80
9,60
4040064/E 08/96
8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
IMPORTANT NOTICE
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any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. T esting and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty . Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
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In order to minimize risks associated with the customer’s applications, adequate design and operating
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Copyright 1998, Texas Instruments Incorporated
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