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Электронный компонент: ICS87974AYI

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ICS87974I Final Data Sheet
background image
87974AYI
www.icst.com/products/hiperclocks.html
REV. B MAY 15, 2003
1
Integrated
Circuit
Systems, Inc.
ICS87974I
L
OW
S
KEW
, 1-
TO
-15,
LVCMOS/LVTTL C
LOCK
G
ENERATOR
G
ENERAL
D
ESCRIPTION
The ICS87974I is a low skew, low jitter 1-to-15
LVCMOS/LVTTL Clock Generator/Zero Delay
Buffer and is a member of the HiPerClockS family
of high performance clock solutions from ICS. The
device has a fully integrated PLL and three banks
whose divider ratios can be independently controlled, providing
output frequency relationships of 1:1, 2:1, 3:1, 3:2, 3:2:1. In ad-
dition, the external feedback connection provides for a wide
selection of output-to-input frequency ratios. The CLK0 and CLK1
pins allow for redundant clocking on the input and dynamically
switching the PLL between two clock sources. The ICS87974I
is pin for pin compatible with the MPC974.
Guaranteed low jitter and output skew characteristics make the
ICS87974I ideal for those applications demanding well defined
performance and repeatability.
F
EATURES
Fully integrated PLL
15 single ended 3.3V LVCMOS/LVTTL outputs
2 LVCMOS/LVTTL clock inputs for redundant clock applications
CLK0 and CLK1 accepts the following input levels:
LVCMOS/LVTTL
Output frequency range: 8.33MHz to 125MHz
VCO range: 200MHz to 500MHz
External feedback for "zero delay" clock regeneration
Cycle-to-cycle jitter: 100ps (typical)
Output skew: 350ps (maximum)
3.3V operating supply
-40C to 85C ambient operating temperature
Pin compatible with the MPC974
HiPerClockSTM
,&6
P
IN
A
SSIGNMENT
V
DDOA
QA0
GND
QA1
V
DDOA
QA2
FB_SEL1
GND
QA3
V
DDOA
QA4
GND
FB_SEL0
GND
nMR/OE
CLK_EN
SEL_B
SEL_C
PLL_SEL
SEL_A
CLK_SEL
CLK0
CLK1
nc
V
DD
V
DDA
1
2
3
4
5
6
7
8
9
10
11
12
13
14 15 16 17 18 19 20 21 22 23 24 25 26
39
38
37
36
35
34
33
32
31
30
29
28
27
52 51 50 49 48 47 46 45 44 43 42 41 40
GND
QB1
V
DDOB
QB2
GND
QB3
V
DDOB
QB4
FB_IN
GND
QFB
V
DDOFB
nc
QB0
V
DDOB
nc
GND
QC3
V
DDOC
QC2
GND
QC1
V
DDOC
QC0
GND
VCO_SEL
ICS87974I
52-Lead LQFP
10mm x 10mm x 1.4mm package body
Y package
Top View
background image
87974AYI
www.icst.com/products/hiperclocks.html
REV. B MAY 15, 2003
2
Integrated
Circuit
Systems, Inc.
ICS87974I
L
OW
S
KEW
, 1-
TO
-15,
LVCMOS/LVTTL C
LOCK
G
ENERATOR
QA0:QA4
QB0:QB4
QC0:QC3
QFB
B
LOCK
D
IAGRAM
PLL
2
4
6
2
2
4
SELA
CLK_SEL
CLK0
CLK1
FB_IN
PLL_SEL
VCO_SEL
SELB
SELC
nMR/OE
FB_SEL0
FB_SEL1
CLK_EN
D Q
D Q
D Q
D Q
5
5
4
(Internal Pulldown)
(Internal Pulldown)
(Internal Pulldown)
(Internal Pullup)
(Internal Pullup)
(Internal Pulldown)
(Internal Pulldown)
(Internal Pullup)
(Internal Pullup)
(Internal Pullup)
(Internal Pulldown)
(Internal Pulldown)
(Internal Pulldown)
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
background image
87974AYI
www.icst.com/products/hiperclocks.html
REV. B MAY 15, 2003
3
Integrated
Circuit
Systems, Inc.
ICS87974I
L
OW
S
KEW
, 1-
TO
-15,
LVCMOS/LVTTL C
LOCK
G
ENERATOR
0
1
4
2
PLL
2
D
D
D
D Q
Q
Q
Q
5
5
4
0
1
0
1
CLK_SEL
CLK0
CLK1
FB_IN
SEL_A
PLL_SEL
SEL_C
FB_SEL(0:1)
nMR/OE
QA0:QA4
QB0:QB4
QC0:QC3
QFB
S
IMPLIFIED
B
LOCK
D
IAGRAM
SEL_B
FB_1 FB_0
0
0
4
0
1
6
1
0
8
1
1 12
SEL_C
0
4
1
6
SEL_B
0
2
1
4
SEL_A
0
2
1
4
VCO_SEL
CLK_EN
background image
87974AYI
www.icst.com/products/hiperclocks.html
REV. B MAY 15, 2003
4
Integrated
Circuit
Systems, Inc.
ICS87974I
L
OW
S
KEW
, 1-
TO
-15,
LVCMOS/LVTTL C
LOCK
G
ENERATOR
T
ABLE
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87974AYI
www.icst.com/products/hiperclocks.html
REV. B MAY 15, 2003
5
Integrated
Circuit
Systems, Inc.
ICS87974I
L
OW
S
KEW
, 1-
TO
-15,
LVCMOS/LVTTL C
LOCK
G
ENERATOR
T
ABLE
3A. O
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ABLE
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Q
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Q
3
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Q
:
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Q
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3B. O
PERATING
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V

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