ICS8732-01
L
OW
V
OLTAGE
, L
OW
S
KEW
3.3V LVPECL C
LOCK
G
ENERATOR
G
ENERAL
D
ESCRIPTION
The ICS8732-01 is a low voltage, low skew,
3.3V LVPECL Clock Generator. The ICS8732-01 has two
selectable clock inputs. The CLK0, nCLK0 pair can accept
most standard differential input levels. The single ended
clock input accepts LVCMOS or LVTTL input levels. The
ICS8732-01 has a fully integrated PLL along with frequency
configurable outputs. An external feedbackinput and
outputs regenerate clocks with “zero delay”.
The ICS8732-01 has multiple divide select pins for each
bank of outputs along with 3 independent feedback divide
select pins allowing the ICS8732-01 to function both as a
frequency multiplier and divider. The PLL_SEL input can
be usedto bypass the PLL for test and system debug
purposes.In bypass mode, the input clock is routed around
the PLLand into the internal output dividers.
Features
•
Ten differential 3.3V LVPECL outputs
•
Selectable differential CLK0, nCLK0 or
LVCMOS/LVTTL CLK1 inputs
•
CLK0, nCLK0 supports the following input types:
LVPECL, LVDS, LVHSTL, SSTL, HCSL
•
CLK1 accepts the following input levels:
LVCMOS or LVTTL
•
Maximum output frequency: 350MHz
•
VCO range: 250MHz to 700MHz
•
External feedback for “zero delay” clock regeneration
with configurable frequencies
•
Cycle-to-cycle jitter: CLK0, nCLK0, 50ps (maximum)
CLK1, 80ps (maximum)
•
Output skew: 150ps (maximum)
•
Static phase offset: -150ps to 150ps
•
Lead-Free package fully RoHS compliant
B
LOCK
D
IAGRAM
CLK_SEL
CLK0
nCLK0
CLK1
FB_IN
nFB_IN
P
IN
A
SSIGNMENT
FBDIV_SEL2
FBDIV_SEL1
FBDIV_SEL0
nFB_IN
nQFB0
nQFB1
FB_IN
QFB0
QFB1
V
CCO
V
CC
V
EE
V
EE
0
1
0
PLL
1
÷2 ÷4 ÷6 ÷8
÷2 ÷4 ÷8 ÷12
÷4 ÷6 ÷8 ÷10
÷8 ÷12 ÷16 ÷20
QA0
nQA0
QA1
nQA1
QA2
nQA2
QA3
nQA3
QB0
nQB0
QB1
nQB1
QB2
nQB2
QB3
nQB3
QFB0
nQFB0
QFB1
nQFB1
V
CCO
QA0
nQA0
QA1
nQA1
V
EE
PLL_SEL
V
CCO
QA2
nQA2
QA3
nQA3
V
EE
1
2
3
4
5
6
7
8
9
52 51 50 49 48 47 46 45 44 43 42 41 40
39
38
37
36
35
34
V
CCO
nQB3
QB3
nQB2
QB2
V
EE
MR
V
CCO
nQB1
QB1
nQB0
QB0
V
EE
PLL_SEL
DIV_SELA0
DIV_SELA1
DIV_SELB0
DIV_SELB1
FBDIV_SEL0
FBDIV_SEL1
FBDIV_SEL2
ICS8732-01
33
32
31
30
29
28
10
11
12
13
27
14 15 16 17 18 19 20 21 22 23 24 25 26
DIV_SELA1
DIV_SELA0
V
CC
V
EE
CLK1
nCLK0
CLK0
CLK_SEL
V
CCA
nc
DIV_SELB1
DIV_SELB0
V
CC
MR
52-Lead LQFP
10mm x 10mm x 1.4mm package body
Y package
Top View
8732AY-01
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1
REV. E JULY 31, 2010
ICS8732-01
L
OW
V
OLTAGE
, L
OW
S
KEW
3.3V LVPECL C
LOCK
G
ENERATOR
T
ABLE
1. P
IN
D
ESCRIPTIONS
Number
1, 8, 32,
39, 40
2, 3,
4, 5
6,
13, 17,
27, 34,
45, 52
7
9, 10,
11, 12
14
15
16, 26,
46
18
19
20
21
22
23
24
25
28, 29,
30, 31
33
35, 36,
37, 38
41, 42,
43, 44
47
48
49
50
51
Name
V
CCO
QA0, nQA0,
QA1, nQA1
V
EE
Type
Power
Output
Description
Output supply pins.
Differential output pair. LVPECL interface levels.
Power
Negative supply pins.
Selects between the PLL and reference clock as the input to the dividers.
When LOW, selects reference clock. When HIGH, selects PLL.
LVCMOS / LVTTL interface levels.
Differential output pairs. LVPECL interface levels.
Determines output divider valued in Table 3.
LVCMOS / LVTTL interface levels.
Determines output divider valued in Table 3.
Pulldown
LVCMOS / LVTTL interface levels.
Pulldown
Core supply pins.
Pulldown LVCMOS / LVTTL reference clock input.
Pullup
Inver ting differential clock input.
Pulldown Non-inver ting differential clock input.
Clock select input. When LOW, selects CLK0, nCLK0.
Pulldown
When HIGH, selects CLK1. LVCMOS / LVTTL interface levels.
Analog supply pin.
No connect.
Determines output divider valued in Table 3.
Pulldown
LVCMOS / LVTTL interface levels.
Determines output divider valued in Table 3.
Pulldown
LVCMOS / LVTTL interface levels.
Differential output pairs. LVPECL interface levels.
Active High Master Reset. When logic HIGH, the internal dividers
are reset causing the true outputs Qx to go low and the inver ted outputs
Pulldown
nQx to go high. When LOW, the internal dividers and the outputs are
enabled. LVCMOS / LVTTL interface levels.
Differential output pairs. LVPECL interface levels.
Differential feedback output pairs. LVPECL interface levels.
Feedback input to phase detector for regenerating clocks
with "zero delay".
Feedback input to phase detector for regenerating clocks
Pullup
with "zero delay".
Selects divide value for differential feedback output pairs.
Pulldown
LVCMOS / LVTTL interface levels.
Selects divide value for differential feedback output pairs.
Pulldown
LVCMOS / LVTTL interface levels.
Selects divide value for differential feedback output pairs.
Pulldown
LVCMOS / LVTTL interface levels.
Pulldown
PLL_SEL
QA2, nQA2,
QA3, nQA3
DIV_SELA1
DIV_SELA0
V
CC
CLK1
nCLK0
CLK0
CLK_SEL
V
CCA
nc
DIV_SELB1
DIV_SELB0
QB0, nQB0,
QB1, nQB1
MR
QB2, nQB2,
QB3, nQB3
QFB1, nQFB1,
QFB0, nQFB0
FB_IN
nFB_IN
FBDIV_SEL0
FBDIV_SEL1
FBDIV_SEL2
Input
Output
Input
Input
Power
Input
Input
Input
Input
Power
Unused
Input
Input
Output
Pullup
Input
Output
Output
Input
Input
Input
Input
Input
NOTE:
Pullup
and
Pulldown
refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
8732AY-01
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2
REV. E JULY 31, 2010
ICS8732-01
L
OW
V
OLTAGE
, L
OW
S
KEW
3.3V LVPECL C
LOCK
G
ENERATOR
T
ABLE
2. P
IN
C
HARACTERISTICS
Symbol
C
IN
R
PULLUP
R
PULLDOWN
Parameter
Input Capacitance
Input Pullup Resistor
Input Pulldown Resistor
Test Conditions
Minimum
Typical
4
51
51
Maximum
Units
pF
kΩ
kΩ
T
ABLE
3A. C
ONTROL
I
NPUT
F
UNCTION
T
ABLE
Inputs
MR
1
0
0
0
0
0
0
0
0
PLL_SEL
X
1
1
1
1
0
0
0
0
DIV_SELA1
X
0
0
1
1
0
0
1
1
FOR
QA0:QA3 O
UTPUTS
Outputs
QA0:QA3, nQA0:nQA3
Low
fVCO/2
fVCO/4
fVCO/6
fVCO/8
fREF_CLK/2
fREF_CLK/4
fREF_CLK/6
fREF_CLK/8
DIV_SELA0
X
0
1
0
1
0
1
0
1
T
ABLE
3B. C
ONTROL
I
NPUT
F
UNCTION
T
ABLE
Inputs
MR
1
0
0
0
0
0
0
0
0
PLL_SEL
X
1
1
1
1
0
0
0
0
DIV_SELB1
X
0
0
1
1
0
0
1
1
FOR
QB0:QB3 O
UTPUTS
Outputs
QB0:QB3, nQB0:nQB3
Low
fVCO/2
fVCO/4
fVCO/8
fVCO/12
fREF_CLK/2
fREF_CLK/4
fREF_CLK/8
fREF_CLK/12
DIV_SELB0
X
0
1
0
1
0
1
0
1
8732AY-01
www.idt.com
3
REV. E JULY 31, 2010
ICS8732-01
L
OW
V
OLTAGE
, L
OW
S
KEW
3.3V LVPECL C
LOCK
G
ENERATOR
T
ABLE
3C. C
ONTROL
I
NPUT
F
UNCTION
T
ABLE
Inputs
MR
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
PLL_SEL
X
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
FBDIV_SEL2
X
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
FBDIV_SEL1
X
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
FBDIV_SEL0
X
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
FOR
QFB0, QFB1
Outputs
QFB0, QFB1
nQFB0, nQFB1
Low
fVCO/4
fVCO/6
fVCO/8
fVCO/10
fVCO/8
fVCO/12
fVCO/16
fVCO/20
fREF_CLK/4
fREF_CLK/6
fREF_CLK/8
fREF_CLK/10
fREF_CLK/8
fREF_CLK/12
fREF_CLK/16
fREF_CLK/20
T
ABLE
4A. Q
X
O
UTPUT
F
REQUENCY W
/FB_IN = QFB0
OR
QFB1
fVCO
CLK1 (MHz)
Minimum
62.5
41.67
31.25
25
31.25
20.83
15.62
Maximum
175
(NOTE 2)
116.67
87.5
70
87.5
58.33
43.75
35
Inputs
FB_IN
QFB
QFB
QFB
QFB
QFB
QFB
QFB
FBDIV_SEL2
0
0
0
0
1
1
1
FBDIV_SEL1
0
0
1
1
0
0
1
FBDIV_SEL0
0
1
0
1
0
1
0
Output Divider Mode
÷4
÷6
÷8
÷
10
÷8
÷
12
÷
16
(NOTE 1)
fREF_CLK x 4
fREF_CLK x 6
fREF_CLK x 8
fREF_CLK x 10
fREF_CLK x 8
fREF_CLK x 12
fREF_CLK x 16
fREF_CLK x 20
QFB
1
1
1
12.5
÷
20
NOTE 1: VCO frequency range is 250MHz to 700MHz.
NOTE 2: The maximum input frequency that the phase detector can accept is 175MHz.
8732AY-01
www.idt.com
4
REV. E JULY 31, 2010
ICS8732-01
L
OW
V
OLTAGE
, L
OW
S
KEW
3.3V LVPECL C
LOCK
G
ENERATOR
A
BSOLUTE
M
AXIMUM
R
ATINGS
Supply Voltage, V
CC
Inputs, V
I
Outputs, I
O
Continuous Current
Surge Current
Package Thermal Impedance,
θ
JA
Storage Temperature, T
STG
4.6V
-0.5V to V
CC
+ 0.5 V
50mA
100mA
42.3°C/W (0 lfpm)
-65°C to 150°C
NOTE: Stresses beyond those listed under Absolute
Maximum Ratings may cause permanent damage to the
device. These ratings are stress specifications only. Functional
operation of product at these conditions or any conditions be-
yond those listed in the
DC Characteristics
or
AC Character-
istics
is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect product reliability.
T
ABLE
5A. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
CC
= V
CCA
= V
CCO
= 3.3V±5%, T
A
= 0°C
TO
70°C
Symbol Parameter
V
CC
V
CCA
V
CCO
I
CC
I
CCA
Core Supply Voltage
Analog Supply Voltage
Output Supply Voltage
Power Supply Current
Analog Supply Current
Test Conditions
Minimum
3.135
3.135
3.135
Typical
3.3
3.3
3.3
Maximum
3.465
3.465
3.465
165
15
Units
V
V
V
mA
mA
T
ABLE
5B. LVCMOS/LVTTL DC C
HARACTERISTICS
,
V
CC
= V
CCA
= V
CCO
= 3.3V±5%, T
A
= 0°C
TO
70°C
Symbol Parameter
V
IH
Input High Voltage
CLK1
CLK_SEL, PLL_SEL,
DIV_SELAx, DIV_SELBx,
FBDIV_SELx, MR
CLK1
CLK_SEL, PLL_SEL,
DIV_SELAx, DIV_SELBx,
FBDIV_SELx, MR
CLK_SEL, MR, CLK1
DIV_SELAx, DIV_SELBx,
FBDIV_SELx
PLL_SEL
CLK_SEL, MR, CLK1
DIV_SELAx, DIV_SELBx,
FBDIV_SELx
PLL_SEL
Test Conditions
Minimum
2
2
-0.3
-0.3
Typical
Maximum
V
CC
+ 0.3
V
CC
+ 0.3
1.3
0.8
Units
V
V
V
V
V
IL
Input Low Voltage
I
IH
Input High Current
V
CC
= V
IN
= 3.465V
V
CC
= V
IN
= 3.465V
V
CC
= 3.465V,
V
IN
= 0V
V
CC
= 3.465V,
V
IN
= 0V
-5
-150
150
5
µA
µA
µA
µA
I
IL
Input Low Current
8732AY-01
www.idt.com
5
REV. E JULY 31, 2010
嵌入式系统
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