87974I PDF даташит
Спецификация 87974I изготовлена «IDT» и имеет функцию, называемую «LVCMOS/LVTTL Clock Generator». |
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Детали детали
Номер произв | 87974I |
Описание | LVCMOS/LVTTL Clock Generator |
Производители | IDT |
логотип |
16 Pages
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Low Skew, 1-to-15,
LVCMOS/LVTTL Clock Generator
87974I
Data Sheet
GENERAL DESCRIPTION
The 87974I is a low skew, low jitter 1-to-15 LVCMOS/
LVTTL Clock Generator/Zero Delay Buffer. 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
addition, 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 dynam-
ically switching the PLL between two clock sources.
Guaranteed low jitter and output skew characteristics make
the 87974I ideal for those applications demanding well defined
performance and repeatability.
FEATURES
• Fully integrated PLL
• Fifteen single ended 3.3V LVCMOS/LVTTL outputs
• Two LVCMOS/LVTTL clock inputs for redundant clock applica-
tions
• 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
• -40°C to 85°C ambient operating temperature
• Available in lead-free RoHS-compliant package
PIN ASSIGNMENT
52-Lead LQFP
10mm x 10mm x 1.4mm package body
Y package
Top View
©2016 Integrated Device Technology, Inc
1
Revision E January 26, 2016
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BLOCK DIAGRAM
87974I Data Sheet
©2016 Integrated Device Technology, Inc
2
Revision E January 26, 2016
No Preview Available ! |
87974I Data Sheet
SIMPLIFIED BLOCK DIAGRAM
CLK_SEL
CLK0
CLK1
FB_IN
CLK_EN
SEL_A
VCO_SEL
0
1 PLL
PLL_SEL
SEL_B
SEL_C
FB_SEL(0:1)
nMR/OE
2
0
÷2 0
SEL_A
0 ÷2
DQ
1
÷4 1
1 ÷4
5 QA0:QA4
SEL_B
0 ÷2
1 ÷4
DQ
5
QB0:QB4
SEL_C
0 ÷4
1 ÷6
DQ
4
QC0:QC3
FB_0 FB_1
0 0 ÷4
0 1 ÷6
1 0 ÷8
1 1 ÷12
DQ
QFB
©2016 Integrated Device Technology, Inc
3
Revision E January 26, 2016
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Номер в каталоге | Описание | Производители |
87974I | LVCMOS/LVTTL Clock Generator | IDT |
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