ICST ICS97U877AKLF 1.8v wide range frequency clock driver Datasheet

ICS97U877AHLF/AKLF
Integrated
Circuit
Systems, Inc.
Advance Information
1.8V Wide Range Frequency Clock Driver
Recommended Application:
• DDR2 Memory Modules / Zero Delay Board Fan Out
• Provides complete DDR DIMM logic solution with
ICSSSTU32864
Pin Configuration
1
2
3
4
5
6
A
B
C
Product Description/Features:
• Low skew, low jitter PLL clock driver
• 1 to 10 differential clock distribution (SSTL_18)
• Feedback pins for input to output synchronization
• Spread Spectrum tolerant inputs
• Auto PD when input signal is at a certain logic state
D
E
F
G
H
J
K
Switching Characteristics:
• Period jitter: 40ps
• Half-period jitter: 60ps
• CYCLE - CYCLE jitter 40ps
• OUTPUT - OUTPUT skew: 40ps
97U877AHLF 52-Ball BGA
A
B
C
D
E
F
G
H
J
K
1
CLKT1
CLKC1
CLKC2
CLKT2
CLK_INT
CLK_INC
AGND
AVDD
CLKT3
CLKC3
2
CLKT0
GND
GND
VDDQ
VDDQ
VDDQ
VDDQ
GND
GND
CLKC4
CLKT0
OE
LD* or OE
CLKC0
LD*, OS or OE
CLKT1
4
CLKC5
GND
NB
VDDQ
NB
NB
VDDQ
NB
GND
CLKT9
40
Powerdown
Control and
Test Logic
OS
AVDD
CLKC1
CLKT2
LD*
PLL bypass
CLKC2
CLKT3
CLKC3
CLKT4
CLKC4
CLKT5
CLKC5
CLK_INT
CLKT6
CLK_INC
5
CLKT5
GND
GND
OS
VDDQ
OE
VDDQ
GND
GND
CLKC9
6
CLKT6
CLKC6
CLKC7
CLKT7
FB_INT
FB_INC
FB_OUTC
FB_OUTT
CLKT8
CLKC8
CLKC1
CLKT1
CLKT0
CLKC0
VDDQ
CLKC5
CLKT5
CLKT6
CLKC6
VDDQ
Block Diagram
3
CLKC0
GND
NB
VDDQ
NB
NB
VDDQ
NB
GND
CLKT4
VDDQ
CLKC2
CLKT2
CLK_INT
CLK_INC
VDDQ
AGND
AVDD
VDDQ
GND
31
30
1
ICS97U877AKLF
10
21
CLKC7
CLKT7
VDDQ
FB_INT
FB_INC
FB_OUTC
FB_OUTT
VDDQ
OE
OS
10K-100k
PLL
GND
FB_INT
FB_INC
* The Logic Detect (LD) powers down the device when a
logic low is applied to both CLK_INT and CLK_INC.
CLKT7
11
CLKC7
CLKT3
CLKC3
CLKC4
CLKT4
VDDQ
CLKT9
CLKC9
CLKC8
CLKT8
VDDQ
CLKC6
CLKT8
CLKC8
CLKT9
CLKC9
20
40-Pin MLF
FB_OUTT
FB_OUTC
0792—12/18/03
ADVANCE INFORMATION documents contain information on products in the formative or design phase development. Characteristic data and other specifications are design goals.
ICS reserves the right to change or discontinue these products without notice. Third party brands and names are the property of their respective owners.
ICS97U877AHLF/AKLF
Advance Information
Pin Descriptions
Te r m i n a l
Name
Electrical
Characteristics
Description
AGND
Analog Ground
Ground
AVDD
A n a l o g p ow e r
1.8 V nominal
CLK_INT
Clock input with a (10K-100K Ohm) pulldown resistor
Differential input
CLK_INC
Complentar y clock input with a (10K-100K Ohm) pulldown resistor
Differential input
FB_INT
Feedback clock input
Differential input
FB_INC
Complementary feedback clock input
Differential input
FB_OUTT
Feedback clock output
Differential output
FB_OUTC
Complementary feedback clock output
Differential output
OE
Output Enable (Asynchronous)
LVCMOS input
OS
Output Select (tied to GND or VDDQ)
LVCMOS input
GND
Ground
Ground
VDDQ
Logic and output power
1.8V nominal
CLKT[0:9]
Clock outputs
Differential outputs
CLKC[0:9]
Complementary clock outputs
Differential outputs
NB
No ball
The PLL clock buffer, ICS97U877, is designed for a VDDQ of 1.8 V, a AVDD of 1.8 V and differential data input and output
levels. Package options include a plastic 52-ball VFBGA and a 40-pin MLF.
ICS97U877 is a zero delay buffer that distributes a differential clock input pair (CLK_INT, CLK_INC) to ten differential
pair of clock outputs (CLKT[0:9], CLKC[0:9]) and one differential pair feedback clock outputs (FB_OUTT, FBOUTC).
The clock outputs are controlled by the input clocks (CLK_INT, CLK_INC), the feedback clocks (FB_INT, FB_INC), the
LVCMOS program pins (OE, OS) and the Analog Power input (AVDD). When OE is low, the outputs (except FB_OUTT/
FB_OUTC) are disabled while the internal PLL continues to maintain its locked-in frequency. OS (Output Select) is a
program pin that must be tied to GND or VDDQ. When OS is high, OE will function as described above. When OS is low,
OE has no effect on CLKT7/CLKC7 (they are free running in addition to FB_OUTT/FB_OUTC). When AVDD is grounded,
the PLL is turned off and bypassed for test purposes.
When both clock signals (CLK_INT, CLK_INC) are logic low, the device will enter a low power mode. An input logic
detection circuit on the differential inputs, independent from the input buffers, will detect the logic low level and perform
a low power state where all outputs, the feedback and the PLL are OFF. When the inputs transition from both being logic
low to being differential signals, the PLL will be turned back on, the inputs and outputs will be enabled and the PLL
will obtain phase lock between the feedback clock pair (FB_INT, FB_INC) and the input clock pair (CLK_INT, CLK_INC)
within the specified stabilization time tSTAB.
The PLL in ICS97U877 clock driver uses the input clocks (CLK_INT, CLK_INC) and the feedback clocks (FB_INT,
FB_INC) to provide high-performance, low-skew, low-jitter output differential clocks (CLKT[0:9], CLKC[0:9]). ICS97U877
is also able to track Spread Spectrum Clocking (SSC) for reduced EMI.
ICS97U877 is characterized for operation from 0°C to 70°C.
0792—12/18/03
2
ICS97U877AHLF/AKLF
Advance Information
Function Table
Inputs
Outputs
PLL
AVDD
OE
OS
CLK_INT
CLK_INT
CLKT
CLKC
FB_OUTT
FB_OUTC
GND
H
X
L
H
L
H
L
H
Bypassed/Off
GND
H
X
H
L
H
L
H
L
Bypassed/Off
GND
L
H
L
H
*L(Z)
*L(Z)
L
H
Bypassed/Off
GND
L
L
H
L
*L(Z),
CLKT7
active
*L(Z),
CLKC7
active
H
L
Bypassed/Off
1.8V(nom)
L
H
L
H
*L(Z)
*L(Z)
L
H
On
1.8V(nom)
L
L
H
L
*L(Z),
CLKT7
active
*L(Z),
CLKC7
active
H
L
On
1.8V(nom)
H
X
L
H
L
H
L
H
On
1.8V(nom)
H
X
H
L
H
L
H
L
On
1.8V(nom)
X
X
L
L
*L(Z)
*L(Z)
*L(Z)
*L(Z)
Off
1.8V(nom)
X
X
H
H
Reser ved
*L(Z) means the outputs are disabled to a low stated meeting the IODL limit.
0792—12/18/03
3
ICS97U877AHLF/AKLF
Advance Information
Absolute Maximum Ratings
Supply Voltage (VDDQ & AVDD) . . . . . . . . .
Logic Inputs . . . . . . . . . . . . . . . . . . . . . . . . .
Ambient Operating Temperature . . . . . . . . . .
Storage Temperature . . . . . . . . . . . . . . . . . . .
-0.5V to 2.5V
GND - 0.5V to VDDQ + 0.5V
0°C to +70°C
-65°C to +150°C
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These
ratings are stress specifications only and functional operation of the device at these or any other conditions above those
listed in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions
for extended periods may affect product reliability.
Electrical Characteristics - Input/Supply/Common Output Parameters
TA = 0 - 70°C; Supply Voltage AVDDQ, VDDQ = 1.8 V +/- 0.1V (unless otherwise stated)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
Input High Current
V I = VDDQ or GND
I IH
(CLK_INT, CLK_INC)
Input Low Current (OE,
I IL
V I = VDDQ or GND
OS, FB_INT, FB_INC)
Output Disabled Low
I ODL
OE = L, VODL = 100mV
100
Current
Operating Supply
I DD1.8 CL = 0pf @ 270MHz
Current
I DDLD
CL = 0pf
Input Clamp Voltage
VIK
V DDQ = 1.7V Iin = -18mA
I OH = -100 μA
High-level output
VDDQ - 0.2
VOH
voltage
I OH = -9 mA
1.1
1.45
I OL=100 μA
0.25
Low-level output voltage
VOL
I OL=9 mA
1
CIN
V I = GND or VDDQ
2
Input Capacitance
COUT
V OUT = GND or V DDQ
2
Output Capacitance1
1
Guaranteed by design, not 100% tested in production.
0792—12/18/03
4
MAX
UNITS
±250
µA
±10
µA
µA
300
500
-1.2
0.10
0.6
3
3
mA
µA
V
V
V
V
V
pF
pF
ICS97U877AHLF/AKLF
Advance Information
Recommended Operating Condition (see note1)
TA = 0 - 70°C; Supply Voltage AVDD, VDDQ = 1.8 V +/- 0.1V (unless otherwise stated)
PARAMETER
Supply Voltage
Low level input voltage
High level input voltage
DC input signal voltage
(note 2)
Differential input signal
voltage (note 3)
Output differential crossvoltage (note 4)
Input differential crossvoltage (note 4)
High level output current
Low level output current
Operating free-air
temperature
SYMBOL
VDDQ, AVDD
VIL
VIH
CONDITIONS
MIN
1.7
CLK_INT, CLK_INC, FB_INC,
FB_INT
OE, OS
CLK_INT, CLK_INC, FB_INC,
0.65 x VDDQ
FB_INT
OE, OS
0.65 x VDDQ
VIN
TYP
1.8
MAX
1.9
UNITS
V
0.35 x V DDQ
V
0.35 x VDDQ
V
V
V
-0.3
VDDQ + 0.3
V
0.3
VDDQ + 0.4
V
0.6
VDDQ + 0.4
V
VOX
V DDQ/2 - 0.10
V DDQ/2 + 0.10
V
VIX
V DDQ/2 - 0.15 VDD/2 VDDQ2 + 0.15
V
VID
DC - CLK_INT, CLK_INC,
FB_INC, FB_INT
AC - CLK_INT, CLK_INC,
FB_INC, FB_INT
IOH
IOL
TA
0
Notes:
1. Unused inputs must be held high or low to prevent them from floating.
2. DC input signal voltage specifies the allowable DC execution of differential input.
3. Differential inputs signal voltages specifies the differential voltage [VTR-VCP]
required for switching, where VTR is the true input level and VCP is the
complementary input level.
4. Differential cross-point voltage is expected to track variations of VDDQ and is the
voltage at which the differential signal must be crossing.
0792—12/18/03
5
-9
9
mA
mA
70
°C
ICS97U877AHLF/AKLF
Advance Information
Timing Requirements
TA = 0 - 70°C Supply Voltage AVDD, VDDQ = 1.8 V +/- 0.1V (unless otherwise stated)
CONDITIONS
PARAMETER
SYMBOL
MIN
MAX
UNITS
Max clock frequency
freqop
1.8V+0.1V @ 25°C
95
370
MHz
Application Frequency
Range
freqApp
1.8V+0.1V @ 25°C
160
350
MHz
Input clock duty cycle
dtin
40
60
%
15
µs
CLK stabilization
TSTAB
Switching Characteristics1
TA = 0 - 70°C Supply Voltage AVDD, VDDQ = 1.8 V +/- 0.1V (unless otherwise stated)
PARAMETER
Output enable time
Output disable time
Period jitter
Half-period jitter
Input slew rate
Output clock slew rate
Cycle-to-cycle period jitter
Dynamic Phase Offset
Static Phase Offset
Output to Output Skew
SSC modulation frequency
SSC clock input frequency
deviation
PLL Loop bandwidth (-3 dB
from unity gain)
SYMBOL
ten
tdis
t jit (per)
t jit(hper)
SLr1(i)
CONDITION
OE to any output
OE to any output
Input Clock
Output Enable (OE), (OS)
SLr1(o)
t jit(cc+)
t jit(cc-)
t ( )dyn
t SPO2
t skew
MIN
30.00
3
40
-40
20
50
40
33
UNITS
ns
ns
ps
ps
v/ns
v/ns
v/ns
ps
ps
ps
ps
ps
kHz
0.00
-0.50
%
-30
-60
1
0.5
1.5
0
0
-20
-50
2.0
Notes:
1. Switching characteristics guaranteed for application frequency range.
2. Static phase offset shifted by design.
0792—12/18/03
6
TYP
4.73
5.82
2.5
2.5
0
MAX
8
8
30
60
4
MHz
ICS97U877AHLF/AKLF
Advance Information
Parameter Measurement Information
VDD
V(CLKC)
V(CLKC)
ICS97U877
GND
Figure 1. IBIS Model Output Load
VDD/2
C = 10 pF - GND
ICS97U877
R = 10Ω
Z = 60Ω
SCOPE
Z = 50Ω
Z = 2.97"
R = 1MΩ
V(TT) C = 1 pF
Z = 120Ω
R = 10Ω
Z = 60Ω
Z = 50Ω
Z = 2.97"
R = 1MΩ
V(TT) C = 1 pF
C = 10 pF
Note: VTT = GND
GND
-VDD/2
Figure 2. Output Load Test Circuit
YX, FB_OUTC
YX, FB_OUTT
tc(n)
tc(n+1)
tjit(cc) = tc(n) ± tc(n+1)
Figure 3. Cycle-to-Cycle Jitter
0792—12/18/03
7
ICS97U877AHLF/AKLF
Advance Information
Parameter Measurement Information
CLK_INC
CLK_INT
FB_INC
FB_INT
t( ) n
n=N
t( ) n
1
t( )=
N
(N is a large number of samples)
Figure 4. Static Phase Offset
YX#
YX
YX, FB_OUTC
YX, FB_OUTT
t(skew)
Figure 5. Output Skew
YX, FB_OUTC
YX, FB_OUTT
tC(n)
YX, FB_OUTC
YX, FB_OUTT
1
fO
t(jit_per) = tc(n) - 1
fO
Figure 6. Period Jitter
0792—12/18/03
8
t ( ) n+1
ICS97U877AHLF/AKLF
Advance Information
Parameter Measurement Information
YX, FB_OUTC
YX, FB_OUTT
t jit(hper_n+1)
t jit(hper_n)
1
fo
tjit(hper) = t jit(hper_n)
-
1
2xfO
Figure 7. Half-Period Jitter
80%
80%
VID, VOD
Clock Inputs
and Outputs
20%
20%
tslr
tslf
Figure 8. Input and Output Slew Rates
0792—12/18/03
9
ICS97U877AHLF/AKLF
Advance Information
CK
CK
FBIN
FBIN
t(
t(
)
SSC OFF
SSC ON
t(
)
SSC OFF
SSC ON
t(
)dyn
t(
)dyn
t(
)dyn
Figure 9. Dynamic Phase Offset
50% VDDQ
OE
t en
Y
50% VDDQ
Y
Y/ Y
OE
50% VDDQ
t dis
Y
50 % VDDQ
Y
Figure 10. Time delay between OE and Clock Output (Y, Y)
0792—12/18/03
10
)dyn
ICS97U877AHLF/AKLF
Advance Information
Figure 11. AVDD Filtering
- Place the 2200pF capacitor close to the PLL.
- Use a wide trace for the PLL analog power & ground. Connect PLL & caps to AGND trace & connect trace to one
GND via (farthest from PLL).
- Recommended bead: Fair-Rite P/N 2506036017Y0 or equivalent (0.8 Ohm DC max, 600 Ohms @ 100 MHz).
0792—12/18/03
11
ICS97U877AHLF/AKLF
Advance Information
C
Seating
Plane
A1
Numeric Designations
for Horizontal Grid
b
REF
T
4 3 2 1
A
B
C
D
Alpha Designations
for Vertical Grid
(Letters I, O, Q & S
not used)
D
d TYP
D1
- e - TYP
TOP VIEW
E
c
REF
h
TYP
- e - TYP
E1
0.12 C
ALL DIMENSIONS IN MILLIMETERS
D
E
16.00 Bsc
13.50 Bsc
7.00 Bsc
5.50 Bsc
5.50 Bsc
4.50 Bsc
T
Min/Max
1.30/1.50
1.30/1.50
0.86/1.00
----- BALL GRID ----HORIZ
VERT
e
0.80 Bsc
0.80 Bsc
0.65 Bsc
6
6
6
19
16
10
Max.
TOTAL
114
96
60
d
Min/Max
0.40/0.50
0.40/0.50
0.35/0.45
h
Min/Max
0.31/0.41
0.25/0.41
0.15/0.21
D1
E1
14.40 Bsc
12.00 Bsc
5.85 Bsc
4.00 Bsc
4.00 Bsc
3.25 Bsc
Note: Ball grid total indicates maximum ball count for package. Lesser quantity may be used.
* Source Ref.: JEDEC Publication 95,
MO-205*, MO-225**
10-0055
Ordering Information
ICS97U877yHT
Example:
ICS XXXX y H - T
Designation for tape and reel packaging
Package Type
H = BGA
Revision Designator (will not correlate with datasheet revision)
Device Type
Prefix
ICS = Standard Device
0792—12/18/03
12
REF. DIMENSIONS
b
c
0.80
0.75
0.575
0.75
0.75
0.625
*
*
**
ICS97U877AHLF/AKLF
Advance Information
Symbol
40-Pin MLF
Common Dimensions
A
-
0.85
A1
0.00
0.01
0.05
A2
-
0.65
0.80
A3
0.20 REF
D
6.00 BSC
D1
5.75 BSC
E
6.00 BSC
E1
5.75 BSC
Q
0.90
12
P
0.24
0.42
0.60
R
0.13
0.17
0.23
Pitch Varation D
e
0.50 BSC
N
40
Nd
10
Ne
Ordering Information
ICS97U877yKT
10
L
0.30
0.40
0.50
b
0.18
0.23
0.30
Q
0.00
0.20
0.45
D2
2.75
2.90
3.05
E2
2.75
2.90
3.05
Example:
ICS XXXX y K - T
Designation for tape and reel packaging
Package Type
K = MLF
Revision Designator (will not correlate with datasheet revision)
Device Type
Prefix
ICS = Standard Device
0792—12/18/03
13