External feedback (FBIN) pin is used to synchronize the
outputs to the clock input signal
No external RC network required for PLL loop stability
Configurable 2.5V or 3.3V LVTTL outputs
t
PD
Phase Error at 100MHz to 166MHz: ±150ps
Jitter (peak-to-peak) at 133MHz and 166MHz: ±75ps
Spread spectrum compatible
Operating Frequency:
−
Std: 25MHz to 140MHz
−
A: 25MHz to 167MHz
Available in TSSOP package
IDT5V2528/A
•
DESCRIPTION:
The IDT5V2528 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.
The IDT5V2528 inputs, PLL core, Y
0
, Y
1
, and FB
OUT
buffers operate from
the 3.3V V
DD
and AV
DD
power supply pins.
One bank of ten outputs provide low-skew, low-jitter copies of CLK. Of
the ten outputs, up to seven may be configured for 2.5V or 3.3V LVTTL
outputs. The number of 2.5V outputs is controlled by 3-level input signals
G_Ctrl and T_Ctrl, and by connecting the appropriate V
DDQ
pins to 2.5V or
3.3V. The 3-level input signals may be hard-wired to high-mid-low levels.
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 G_Ctrl input.
When the G_Ctrl input is mid or high, the outputs switch in phase and
frequency with CLK; when the G_Ctrl is low, all outputs (except FB
OUT
) are
disabled to the logic-low state.
Unlike many products containing PLLs, the IDT5V2528 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 IDT5V2528 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 test purposes by strapping AV
DD
to ground.
FUNCTIONAL BLOCK DIAGRAM
28
G_Ctrl
1
3
TY0, V
DDQ
pin 4
26
T_Ctrl
TY1, V
DDQ
pin 25
24
TY2, V
DDQ
pin 25
MODE
SELECT
17
TY3, V
DDQ
pin 15
16
TY4, V
DDQ
pin 15
13
TY5, V
DDQ
pin 11
12
TY6, V
DDQ
pin 11
CLK
6
PLL
10
TY7, V
DDQ
pin 11
20
Y0, V
DD
pin 21
19
FBIN
7
AV
DD
5
22
Y1, V
DD
pin 21
FBOUT, V
DD
pin 21
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
c
2002
Integrated Device Technology, Inc.
OCTOBER 2008
DSC 5971/12
IDT5V2528/A
2.5 / 3.3V PHASE-LOCK LOOP CLOCK DRIVER
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
T_Ctrl
GND
TY0
V
DDQ
AV
DD
CLK
FBIN
AGND
GND
TY7
V
DDQ
TY6
TY5
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
G_Ctrl
GND
TY1
V
DDQ
TY2
GND
FBOUT
V
DD
Y0
Y1
GND
TY3
TY4
V
DDQ
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
DD,
V
DDQ,
AV
DD
V
I (2)
V
O(2)
I
IK
(V
I
< 0)
I
OK
(V
O
< 0 or V
O
> V
DD
)
I
O
(V
O
= 0 to V
DD
)
V
DD
or GND
T
STG
T
J
Continuous Current
Storage Temperature Range
Junction Temperature
±200
–65 to +150
+150
mA
°C
°C
Continuous Output Current
±50
mA
Rating
Supply Voltage Range
Input Voltage Range
Voltage Range applied to any
output in the HIGH or LOW state
Input Clamp Current
Output Clamp Current
Max.
–0.5 to +4.6
–0.5 to +5.5
–0.5 to
V
DD
+0.5
–50
±50
mA
mA
Unit
V
V
V
TSSOP
TOP VIEW
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.
CAPACITANCE
(1)
Symbol
C
IN
C
O
C
L
Description
Input Capacitance
V
I
= V
DD
or GND
Output Capacitance
V
I
= V
DD
or GND
Load Capacitance
2.5V outputs
Min
Typ.
5
6
20
30
Max.
Unit
pF
pF
pF
—
—
—
—
—
—
—
—
3.3V outputs
NOTE:
1. Unused inputs must be held HIGH or LOW to prevent them from floating.
RECOMMENDED OPERATING RANGE
Symbol
V
DD,
AV
DD (1)
V
DDQ (1)
T
A
Description
Power Supply Voltage
Power Supply Voltage
Ambient Operating Temperature
2.5V Outputs
3.3V Outputs
Min.
3
2.3
3
–40
Typ.
3.3
2.5
3.3
+25
Max.
3.6
2.7
3.6
+85
Unit
V
V
°C
NOTE:
1. All power supplies should operate in tandem. If V
DD
or V
DDQ
is at a maximum, then V
DDQ
or V
DD
(respectively) should be at maximum, and vice-versa.
2
IDT5V2528/A
2.5 / 3.3V PHASE-LOCK LOOP CLOCK DRIVER
INDUSTRIAL TEMPERATURE RANGE
PIN DESCRIPTION
Terminal
Name
CLK
(1)
FBIN
G_Ctrl
(2)
No.
6
7
28
Type
I
I
3-level
Description
Clock input
Feedback input
3-level input for 2.5V / 3.3V Output Select/ Output bank enable. When G_Ctrl is LOW, all outputs except FBOUT are disabled
to a logic-LOW state. When G_Ctrl is MID or HIGH, all outputs are enabled and switch at the same frequency as CLK (see
OUTPUT SELECTION table).
T_Ctrl
(2)
FBOUT
TY
(7:0)
Y
(1:0)
AV
DD(3)
AGND
V
DD
V
DDQ
GND
1
22
3, 10, 12, 13,
16, 17, 24, 26
19, 20
5
8
21
4, 11, 15, 25
2, 9, 14, 18
23, 27
NOTES:
1. 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 of 1ms
is required for the PLL to phase lock the feedback signal to the reference signal.
2. 3-level inputs will float to MID logic level if left unconnected.
3. AV
DD
can be used to bypass the PLL for test purposes. When AV
DD
is strapped to ground, PLL is bypassed and CLK is buffered directly to the outputs.
3-level
O
O
O
Power
Ground
Power
Power
Ground
3-level input for 2.5V / 3.3V Output Select (see OUTPUT SELECTION table)
Feedback output
2.5V or 3.3V Clock outputs. 1, 2, 3, 5, or 7 of these outputs may be selected as 2.5V outputs (see OUTPUT SELECTION table).
3.3V Clock Outputs
3.3V Analog power supply. AV
DD
provides the power reference for the analog circuitry.
Analog ground. AGND provides the ground reference for the analog circuitry.
3.3V Power supply
2.5V or 3.3V Power supply for TY outputs
Ground
STATIC FUNCTION TABLE
(A
VDD
= 0V)
(1)
G_Ctrl
L
L
Inputs
T_Ctrl
X
X
CLK
L
H
H
L
running
TY
(7:0)
L
L
H
L
running
Outputs
Y
(1:0)
L
L
H
L
running
FBOUT
L
H
H
L
running
OUTPUT SELECTION
G_Ctrl
M
M
M
H
H
H
T_Ctrl
L
M
H
L
M
H
TY
(7:0)
TY
0
(2.5V)
TY
1
- TY
7
(3.3V)
TY
1,
TY
2
(2.5V)
TY
0,
TY
3
- TY
7
(3.3V)
TY
0
- TY
2
(2.5V)
TY
3
- TY
7
(3.3V)
TY
0
- TY
4
(2.5V)
TY
5
- TY
7
(3.3V)
TY
1
- TY
7
(2.5V)
TY
0
(3.3V)
TY
o
- TY
7
(3.3V)
V
DDQ
Configuration
Pin 4 (2.5V)
Pins 11, 15, 25 (3.3V)
Pin 25 (2.5V)
Pins 4, 11, 15 (3.3V)
Pins 4, 25 (2.5V)
Pins 11, 15 (3.3V)
Pins 4, 15, 25 (2.5V)
Pin 11 (3.3V)
Pins 11, 15, 25 (2.5V)
Pin 4 (3.3V)
Pins 4, 11, 15, 25 (3.3V)
see
OUTPUT SELECTION
table
NOTE:
1. AV
DD
should be powered up along with V
DD
, before setting AV
DD
to ground, to put the
control pins in a valid state.
DYNAMIC FUNCTION TABLE
(A
VDD
= 3.3V)
Inputs
G_Ctrl
T_Ctrl
L
X
L
X
see OUTPUT
SELECTION table
CLK
L
H
L
H
TY
(7:0)
L
L
L
H
Outputs
Y
(1:0)
L
L
L
H
FBOUT
L
H
L
H
3
IDT5V2528/A
2.5 / 3.3V PHASE-LOCK LOOP CLOCK DRIVER
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Symbol
V
IK
V
IH
V
IL
V
IHH
V
IMM
V
ILL
V
OH
V
OH
V
OL
V
OL
I
3
Parameter
Input Clamp Voltage
Input HIGH Level
Input LOW Level
Input HIGH Voltage Level
(2)
Input MID Voltage Level
(2)
Input LOW Voltage Level
(2)
Output HIGH Voltage Level
(3.3V Outputs)
Output HIGH Voltage Level
(2.5V Outputs)
Output LOW Voltage Level
(3.3V Outputs)
Output LOW Voltage Level
(2.5V Outputs)
3-Level Input DC Current
(G_Ctrl, T_Ctrl)
Input Current
Test Conditions
I
I
= -18mA
CLK, FBIN
CLK, FBIN
3-Level Inputs Only
3-Level Inputs Only
3-Level Inputs Only
I
OH
= -100μA
I
OH
= -12mA
I
OH
= -100μA
I
OH
= -12mA
I
OL
= 100μA
I
OL
= 12mA
I
OL
= 100μA
I
OL
= 12mA
V
IN
= V
DD
V
IN
= V
DD
/2
V
IN
= GND
V
I
= V
DD
or GND
Min.
2
V
DD
- 0.6
V
DD
/2 - 0.3
V
DD
- 0.2
2.4
V
DD
- 0.1
2
Typ.
(1)
Unit
V
V
0.8
V
V
V
DD
/2 + 0.3 V
0.6
V
V
Max
- 1.2
HIGH Level
MID Level
LOW Level
–50
–200
0.2
0.4
0.1
0.4
+200
+50
±5
V
V
V
μA
μA
I
I
NOTES:
1. For conditions shown as Min or Max, use the appropriate value specified under recommended operating conditions.
2. These inputs are normally wired to V
DD
, GND, or left floating. Internal termination resistors bias floating inputs to V
DD
/2. If these inputs are switched, the function and timing of
the outputs may be glitched, and the PLL may require an additional t
LOCK
time before all datasheet limits are achieved.
POWER SUPPLY CHARACTERISTICS
Symbol
I
DDPD
I
DDA
I
DD
I
DDD
Parameter
Power Down Supply Current
AV
DD
Supply Current
Dynamic Power Supply Current
Dynamic Power Supply
Current per Output
Test Conditions
V
DD
= 3.6, V
DDQ
= 2.7V / 3.3V, AV
DD
= 0V
V
DD
= AV
DD
= 3.6V, V
DDQ
= 2.7V / 3.3V, CLK = 0 or V
DD
V
DD
= AV
DD
= 3.6V, V
DDQ
= 2.7V / 3.3V, C
L
= 0pF
V
DD
= AV
DD
= V
DDQ
= 3.6V
C
L
= 30pF, CLK = 100MHz
V
DD
= AV
DD
= 3.6V, V
DDQ
= 2.7V
C
L
= 20pF, CLK = 100MHz
Typ.
(1)
8
3.5
500
15
12
Max
40
10
—
—
—
Unit
μA
mA
μA/MHz
mA
NOTE:
1. For nominal voltage and temperature.
4
IDT5V2528/A
2.5 / 3.3V PHASE-LOCK LOOP CLOCK DRIVER
INDUSTRIAL TEMPERATURE RANGE
INPUT TIMING REQUIREMENTS OVER OPERATING RANGE
5V2528
Min
f
CLOCK
t
LOCK
Clock frequency
Input clock duty cycle
Stabilization time
(1)
25
40%
Max
140
60%
1
Min
25
40%
5V2528A
Max
167
60%
1
ms
Units
MHz
NOTE:
1.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.
SWITCHING CHARACTERISTICS OVER OPERATING RANGE - 5V2528
(1)
Symbol
t
PHASE
error
t
PHASE
error - jitter
(3)
t
SK
1(0)
(4)
t
SK
2(0)
(4)
t
SK
3(0)
(4,5)
t
J
t
R
t
F
t
R
t
F
Parameter
(2)
Phase Error from Rising Edge CLK to Rising Edge FBIN (100MHz-133MHz)
Phase Error minus Jitter from Rising Edge CLK to Rising Edge FBIN (133MHz)
Output Skew between 3.3V Outputs
Output Skew between 2.5V Outputs
Output Skew between 2.5V and 3.3V Outputs
Cycle-to-Cycle Output Jitter (Peak-to-Peak) at 133MHz
Duty Cycle
Output Rise Time for 3.3V Outputs (20% to 80%)
Output Fall Time for 3.3V Outputs (20% to 80%)
Output Rise Time for 2.5V Outputs (20% to 80%)
Output Fall Time for 2.5V Outputs (20% to 80%)
Min.
–
150
–
50
—
—
—
–
75
45
0.8
0.8
0.5
0.5
Typ.
—
—
—
—
—
—
—
—
—
—
—
Max.
150
50
150
150
200
75
55
2.1
2.1
1.5
1.5
Unit
ps
ps
ps
ps
ps
ps
%
ns
ns
ns
ns
SWITCHING CHARACTERISTICS OVER OPERATING RANGE - 5V2528A
(1)
Symbol
t
PHASE
error
t
PHASE
error - jitter
(3)
t
SK
1(0)
(4)
t
SK
2(0)
(4)
t
SK
3(0)
(4,5)
t
J
t
R
t
F
t
R
t
F
Parameter
(2)
Phase Error from Rising Edge CLK to Rising Edge FBIN (100MHz-166MHz)
Phase Error minus Jitter from Rising Edge CLK to Rising Edge FBIN (166MHz)
Output Skew between 3.3V Outputs
Output Skew between 2.5V Outputs
Output Skew between 2.5V and 3.3V Outputs 25MHz to 133MHz
133MHz to 166MHz
Cycle-to-Cycle Output Jitter (Peak-to-Peak) at 166MHz
Duty Cycle
Output Rise Time for 3.3V Outputs (20% to 80%)
Output Fall Time for 3.3V Outputs (20% to 80%)
Output Rise Time for 2.5V Outputs (20% to 80%)
Output Fall Time for 2.5V Outputs (20% to 80%)
Min.
–
150
–
50
—
—
—
—
–
75
45
0.8
0.8
0.5
0.5
Typ.
—
—
—
—
—
—
—
—
—
—
—
—
Max.
150
50
150
150
200
250
75
55
2.1
2.1
1.5
1.5
Unit
ps
ps
ps
ps
ps
ps
%
ns
ns
ns
ns
NOTES:
1. All parameters are measured with the following load conditions: 30pF || 500Ω for 3.3V outputs and 20pF || 500Ω for 2.5V outputs.
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. All skew parameters are only valid for equal loading of all outputs.
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