IDT IDTCSP2510DPG

IDTCSP2510D
3.3V PHASE-LOCK LOOP CLOCK DRIVER
0°C TO 85°C TEMPERATURE RANGE
IDTCSP2510D
3.3V PHASE-LOCK LOOP
CLOCK DRIVER
ZERO DELAY BUFFER
DESCRIPTION:
FEATURES:
The CSP2510D 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 CSP2510D
operates at 3.3V.
One bank of ten outputs provide low-skew, low-jitter copies of CLK.
Output signal duty cycles are adjusted to 50 percent, independent of the duty
cycle at CLK. The outputs can be enabled or disabled via the control G input.
When the G input is high, the outputs switch in phase and frequency with
CLK; when the G input is low, the outputs are disabled to the logic-low state.
Unlike many products containing PLLs, the CSP2510D 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 CSP2510D 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, as well as
following any changes to the PLL reference or feedback signals. The PLL
can be bypassed for the test purposes by strapping AVDD to ground.
The CSP2510D is specified for operation from 0°C to +85°C. This device
is also available (on special order) in Industrial temperature range (-40°C
to +85°C). See ordering information for details.
• Phase-Lock Loop Clock Distribution for Synchronous DRAM
Applications
• Distributes one clock input to one bank of ten outputs
• Output enable bank control
• External feedback (FBIN) pin is used to synchronize the
outputs to the clock input signal
• No external RC network required for PLL loop stability
• Operates at 3.3V VDD
• tpd Phase Error at 166MHz: < ±150ps
• Jitter (peak-to-peak) at 166MHz: < ±75ps @ 166MHz
• Spread Spectrum Compatible
• Operating frequency 50MHz to 175MHz
• Available in 24-Pin TSSOP package
APPLICATIONS:
• SDRAM Modules
• PC Motherboards
• Workstations
FUNCTIONAL BLOCK DIAGRAM
11
G
3
Y0
4
Y1
5
Y2
8
Y3
9
Y4
15
Y5
16
Y6
17
CLK
24
Y7
PLL
20
13
Y8
FBIN
21
AV DD
Y9
23
12
FBOUT
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
0ººC TO 85ººC TEMPERATURE RANGE
OCTOBER 2001
1
c
2001 Integrated Device Technology, Inc.
DSC-5874/2
IDTCSP2510D
3.3V PHASE-LOCK LOOP CLOCK DRIVER
0°C TO 85°C TEMPERATURE RANGE
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS(1)
Symbol
Rating
Max
Unit
VDD
VI(1)
Supply Voltage Range
Input Voltage Range
–0.5 to +4.6
–0.5 to +6.5
V
V
VO(1,2)
Voltage range applied to any
output in the high or low state
–0.5 to VDD + 0.5
V
IIK
(VI <0)
Input clamp current
–50
mA
IOK
(VO <0 or
Terminal Voltage with Respect
to GND (inputs VIH 2.5, VIL 2.5)
±50
mA
Continuous Output Current
±50
mA
±100
mA
– 65 to +150
+150
°C
°C
AGND
1
24
CLK
VDD
2
23
AVDD
Y0
3
22
VDD
Y1
4
21
Y9
Y2
5
20
Y8
GND
6
19
GND
VO > VDD)
IO
GND
7
18
GND
(VO = 0 to VDD)
VDD or GND
Continuous Current
TSTG
TJ
Storage Temperature Range
Junction Temperature
Y3
8
17
Y7
Y4
9
16
Y6
VDD
10
15
Y5
G
11
14
VDD
FBOUT
12
13
FBIN
NOTES:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause
permanent damage to the device. This is a stress rating only and functional operation
of the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability.
2. The input and output negative-voltage ratings may be exceeded if the input and output
clamp-current ratings are observed.
3. The maximum package power dissipation is calculated using a junction temperature
of 150°C and a board trace length of 750 mils.
TSSOP
TOP VIEW
CAPACITANCE
Parameter
CIN
Description
Input Capacitance
Min.
Typ.
Max.
Unit

5

pF

6

pF

30

pF
VI = VDD or GND
CO
Output Capacitance
VO = VDD or GND
CL
Load Capacitance
NOTE:
1. Unused inputs must be held HIGH or LOW to prevent them from floating.
RECOMMENDED OPERATING CONDITIONS
Symbol
VDD, AVDD
TA
Min.
Max.
Unit
Power Supply Voltage
Description
3
3.6
V
Operating Free-Air Temperature
0
+85
°C
2
IDTCSP2510D
3.3V PHASE-LOCK LOOP CLOCK DRIVER
0°C TO 85°C TEMPERATURE RANGE
PIN DESCRIPTION
Terminal
Name
No.
Type
Description
CLK
24
I
Clock input. CLK provides the clock signal to be distributed by the CSP2510D clock driver. CLK is used to provide the reference signal
to the integrated PLL that generates the clock output signals. CLK must 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.
FBIN
13
I
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.
G
11
I
Output bank enable. G is the output enable for outputs Y(0:9). When G is low, outputs Y(0:9) are disabled to a logic-low state. When
G is high, all outputs Y(0:9) are enabled and switch at the same frequency as CLK.
FBOUT
12
O
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.
Y (0:9)
3, 4, 5, 8, 9,
O
15, 16, 17,
Clock outputs. These outputs provide low-skew copies of CLK. Output bank Y(0:9) is enabled via the G input. These outputs can be
disabled to a logic-low state by de-asserting the G control input.
20, 21
AVDD
23
Power
Analog power supply. AVDD provides the power reference for the analog circuitry. In addition, AVDD can be used to bypass the PLL
for test purposes. When AVDD is strapped to ground, PLL is bypassed and CLK is buffered directly to the device outputs.
AGND
1
Ground
Analog ground. AGND provides the ground reference for the analog circuitry.
VDD
2, 10, 14, 22 Power
Power supply
GND
6, 7, 18, 19 Ground
Ground
STATIC FUNCTION TABLE (AVDD = 0V)
Inputs
DYNAMIC FUNCTION TABLE (AVDD = 3.3V)
Outputs
Inputs
Outputs
G
CLK
Y (0:9)
FBOUT
G
L
L
L
L
X
L
L
L
L
H
L
H
L
running
L
running in
H
H
H
H
H
L
L
L
L
H
L
H
H
running
running
running
H
running
running in
running in
phase with CLK
phase with CLK
H
H
H
H
CLK
Y (0:9)
FBOUT
phase with CLK
3
IDTCSP2510D
3.3V PHASE-LOCK LOOP CLOCK DRIVER
0°C TO 85°C TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING FREE-AIR TEMPERATURE RANGE(1)
Symbol
Description
Test Conditions
VDD
Min.
VIK
Input Clamp Voltage
II = -18mA
3V
VIH
Input HIGH Level
VIL
Input LOW Level
VOH
HIGH Level Output Voltage
VOL
LOW Level Output Voltage
(2)
Typ.
Max.
Unit


– 1.2
V

2


V



0.8
V
IOH = -100µA
Min. to Max.
VDD – 0.2


IOH = -12mA
3V
2.1


IOH = -6mA
3V
2.4


IOL = 100µA
Min. to Max.


0.2
IOL = 12mA
3V


0.8
V
V
3V


0.55
Input Current
VI = VDD or GND
3.6V


±5
µA
IDD
Supply Current
VI = VDD or GND, AVDD = GND,
3.6V


10
µA
∆IDD
Change in Supply Current
One input at VDD - 0.6V, other inputs at VDD or GND
3.3V to 3.6V


500
µA
CPD
Power Dissipation Capacitance
3.6V

10
14
pF
AVDD = 3.3V

10

mA
IOL = 6mA
II
IO = 0, Outputs: LOW or HIGH
(3)
IDDA
AVDD Power Supply Current
NOTES:
1. For Industrial devices, operating free-air temperature = -40°C to +85°C.
2. For conditions shown as Min. or Max., use the appropriate value specified under recommended operating conditions.
3. For IDD of AVDD, see TYPICAL CHARACTERISTICS.
TIMING REQUIREMENTS OVER OPERATING RANGE OF SUPPLY VOLTAGE AND
OPERATING FREE-AIR TEMPERATURE(1)
Min.
Clock frequency
fCLOCK
Max.
Unit
MHz
50
175
Input clock duty cycle
40%
60%
Stabilization time(2)

1
ms
NOTES:
1. For Industrial devices, operating free-air temperature = -40°C to +85°C.
2. 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.
4
IDTCSP2510D
3.3V PHASE-LOCK LOOP CLOCK DRIVER
0°C TO 85°C TEMPERATURE RANGE
SWITCHING CHARACTERISTICS OVER OPERATING RANGE OF SUPPLY
VOLTAGE AND OPERATING FREE-AIR TEMPERATURE, CL = 30pF(1)
VDD = 3.3V ± 0.3V
Parameter
(2)
tPHASE error
From (Input)
To (Output)
Min.
Typ.
Max.
Unit
100MHz < CLK↑ < 166MHz
FBIN↑
– 150




150
ps



tPHASE error – jitter(3)
CLK↑ = 166MHz
FBIN↑
– 50
tSK(o) (4)
Any Y (166MHz)
Any Y

Jitter (cycle-cycle)
CLK = 166MHz
Any Y or FBOUT
– 75
CLK = 166MHz
Any Y or FBOUT
45
tR
Any Y or FBOUT
0.8
tF
Any Y or FBOUT
0.8
50
ps
150
ps
75
ps
55
%
2.1
ns
2.5
ns
(peak-to-peak)
Duty cycle reference (5)
NOTES:
1. For Industrial devices, operating free-air temperature = -40°C to +85°C. See PARAMETER MEASUREMENT INFORMATION.
2. The specifications for parameters in this table are applicable only after any appropriate stabilization time has elapsed.
3. Phase error does not include jitter.
4. The tSK(O) specification is only valid for equal loading of all outputs.
5. See TYPICAL CHARACTERISTICS.
5
IDTCSP2510D
3.3V PHASE-LOCK LOOP CLOCK DRIVER
0°C TO 85°C TEMPERATURE RANGE
PARAMETER MEASUREMENT INFORMATION(1)
From Output
Under Test
3V
50% V DD
0V
Input
CL =
30pF (2)
500 Ω
tPHASE
ER ROR
2V
Output
or
FBIN
50% V DD
0.4V
tR
tF
CLK
CLK
C L = 30pF (2)
F BIN
CF
tP HASE
ERROR
Y
CSP2510D
500 Ω
on each
Y output
FBOUT
F BOUT
Any Y
t SK(o)
PCB TRACE
Any Y
Any Y
tS K(o)
Phase ERROR and Skew Calculations (3,4)
NOTES:
1. All inputs pulses are supplied by generators having the following characteristics: PRR ≤ 100MHz ZO = 50Ω, tR ≤ 1.2 ns, tF≤ 1.2 ns.
2. CL includes probe and jig capacitance.
3. The outputs are measured one at a time with one transition per measurement.
4. Phase error measurements require equal loading at outputs Y and FBOUT. CF = CL – CFBIN – CPCBTRACE; CFBIN ≅ 6pF.
6
0.4V
V OL
Load Circuit and Voltage Waveforms
FBIN
V OH
2V
IDTCSP2510D
3.3V PHASE-LOCK LOOP CLOCK DRIVER
0°C TO 85°C TEMPERATURE RANGE
TYPICAL CHARACTERISTICS
Phase Error vs Clock Frequency
AVDD and VDD = 3.3V
Ta = 25C
200
150
100
Time (ps)
50
0
50
66
100
133
166
175
-50
-100
-150
-200
Clock Frequency (MHz)
Analog Supply Current vs Clock Frequency
AVDD and VDD = 3.3V
Ta = 25C
16
14
Analog Current (mA)
12
10
8
6
4
2
0
50
66
100
133
Clock Frequency (MHz)
7
166
175
IDTCSP2510D
3.3V PHASE-LOCK LOOP CLOCK DRIVER
0°C TO 85°C TEMPERATURE RANGE
TYPICAL CHARACTERISTICS (CONT.)
Output Duty Cycle vs Clock Frequency
AVDD and V DD = 3.3V
Ta = 25C
55
54
53
Duty Cycle (%)
52
51
50
49
48
47
46
45
50
66
100
133
166
175
Clock Frequency (MHz)
Jitter vs Clock Frequency
AVDD and V DD = 3.3V
Ta = 25C
140
120
Jitter (ps)
100
80
60
Peak-to-Peak
40
20
Cycle-to-Cycle
0
50
66
100
133
Clock Frequency (MHz)
8
166
175
IDTCSP2510D
3.3V PHASE-LOCK LOOP CLOCK DRIVER
0°C TO 85°C TEMPERATURE RANGE
ORDERING INFORMATION
IDTCSP XXXXX
Device Type
XX
Package
X
Process
CORPORATE HEADQUARTERS
2975 Stender Way
Santa Clara, CA 95054
Blank
I
0°C to +85°C (Standard)
-40°C to +85°C (Industrial)
PG
Thin Shrink Small Outline Package
2510D
Phase-Lock Loop Clock Driver
for SALES:
800-345-7015 or 408-727-6116
fax: 408-492-8674
www.idt.com
9
for Tech Support:
[email protected]
(408) 654-6459