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87949AYILFT

Description
clock generators & support products 10 lvcmos out buffer/divider
Categorysemiconductor    Other integrated circuit (IC)   
File Size216KB,13 Pages
ManufacturerIDT (Integrated Device Technology, Inc.)
Websitehttp://www.idt.com/
Environmental Compliance  
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87949AYILFT Overview

clock generators & support products 10 lvcmos out buffer/divider

87949AYILFT Parametric

Parameter NameAttribute value
ManufactureIDT (Integrated Device Technology)
Product CategoryClock Generators & Support Products
RoHSYes
Package / CaseTQFP-52
PackagingReel
Factory Pack Quantity500
L
OW
S
KEW
,
÷1, ÷2
C
LOCK
G
ENERATOR
G
ENERAL
D
ESCRIPTION
The ICS87949I is a low skew, ÷1, ÷2 Clock Generator.
The ICS87949I has selectable single ended clock or
LVPECL clock inputs. The single ended clock input
accepts LVCMOS or LVTTL input levels. The PCLK, nPCLK
pair can accept LVPECL, CML, or SSTL input levels. The
low impedance LVCMOS outputs are designed to drive 50Ω
series or parallel terminated transmission lines.The
effective fanout can be increased from 15 to 30 by utilizing
the ability of the outputs to drive two series terminated lines.
The divide select inputs, DIV_SELx, control the output
frequency of each bank. The outputs can be utilized in the
÷1, ÷2 or a combination of ÷1 and ÷2 modes. The master
reset input, MR/nOE, resets the internal frequency dividers
and also controls the active and high impedance states of
all outputs.
The ICS87949I is characterized at 3.3V core/3.3V output.
Guaranteed output and part-to-part skew characteristics make
the ICS87949I ideal for those clock distribution applications
demanding well defined performance and repeatability.
ICS87949I
F
EATURES
• Fifteen single ended LVCMOS outputs,
7Ω typical output impedance
• Selectable LVCMOS or LVPECL clock inputs
• CLK0 and CLK1 can accept the following input levels:
LVCMOS and LVTTL
• PCLK, nPCLK supports the following input types:
LVPECL, CML, SSTL
• Maximum output frequency: 160MHz
• Output skew: 350ps (maximum)
• Part-to-part skew: 2.75ns (maximum)
• 3.3V supply voltage
• -40°C to 85°C ambient operating temperature
• Available in both standard and lead-free RoHS compliant
packages
B
LOCK
D
IAGRAM
CLK_SEL
CLK0
CLK1
PCLK
nPCLK
PCLK_SEL
1
DIV_SELA
0
QB0:QB2
1
DIV_SELB
0
QC0:QC3
1
DIV_SELC
0
QD0:QD5
1
DIV_SELD
MR/nOE
0
0
1
1
÷1
÷2
R
0
QA0:QA1
P
IN
A
SSIGNMENT
GND
GND
GND
GND
V
DDB
V
DDA
V
DDB
QA0
QA1
QB0
QB1
QB2
nc
MR/nOE
CLK_SEL
V
DD
CLK0
CLK1
PCLK
nPCLK
PCLK_SEL
DIV_SELA
DIV_SELB
DIV_SELC
DIV_SELD
GND
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
nc
GND
QC0
V
DDC
QC1
GND
QC2
V
DDC
QC3
GND
GND
QD5
nc
ICS87949I
33
32
31
30
29
28
10
11
12
13
27
14 15 16 17 18 19 20 21 22 23 24 25 26
nc
GND
QD0
V
DDD
QD1
GND
QD2
V
DDD
QD3
GND
QD4
V
DDD
nc
52-Lead LQFP
10mm x 10mm x 1.4mm package body
Y Package
Top View
87949AYI
www.idt.com
1
REV. C AUGUST 5, 2010

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Description clock generators & support products 10 lvcmos out buffer/divider clock generators & support products 10 lvcmos out buffer/divider
Manufacture IDT (Integrated Device Technology) IDT (Integrated Device Technology)
Product Category Clock Generators & Support Products Clock Generators & Support Products
RoHS Yes Yes
Package / Case TQFP-52 TQFP-52
Packaging Reel Tray
Factory Pack Quantity 500 160
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