ICS87946AYI-01T IDT, Integrated Device Technology Inc, ICS87946AYI-01T Datasheet

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ICS87946AYI-01T

Manufacturer Part Number
ICS87946AYI-01T
Description
Manufacturer
IDT, Integrated Device Technology Inc
Type
Clock Dividerr
Datasheet

Specifications of ICS87946AYI-01T

Number Of Clock Inputs
1
Mode Of Operation
Differential
Output Logic Level
LVCMOS/LVTTL
Operating Supply Voltage (min)
3.135V
Operating Supply Voltage (typ)
3.3V
Operating Supply Voltage (max)
3.465V
Package Type
LQFP
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
32
Lead Free Status / RoHS Status
Not Compliant
General Description
series or parallel terminated transmission lines. The effective fanout
can be increased from 10 to 20 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 ICS87946I-01 is characterized at 3.3V core/3.3V output and
3.3V core/2.5V output. Guaranteed bank, output and part-to-part
skew characteristics make the ICS87946I-01 ideal for those clock
distribution applications demanding well defined performance and
repeatability.
ICS87946AYI-01 REVISION B NOVEMBER 10, 2009
HiPerClockS™
ICS
Block Diagram
DIV_SELA
DIV_SELB
DIV_SELC
MR/nOE
nPCLK
PCLK
Pulldown
Pulldown
Pullup
Pullup
Pulldown
Pulldown
Pulldown
Pulldown
The ICS87946I-01 is a low skew, ÷1, ÷2 Clock
Generator. The ICS87946I-01 has one LVPECL clock
input pair. The PCLK/nPCLK pair can accept LVPECL,
CML, or SSTL input levels. The low impedance
LVCMOS/LVTTL outputs are designed to drive 50Ω
Low Skew,
Clock Generator
÷2
÷1
0
1
0
1
0
0
1
1
÷1, ÷2
3
3
4
QA0:QA2
QB0:QB2
QC0:QC3
LVPECL-To-LVCMOS/LVTTL
1
Features
Ten single ended LVCMOS/LVTTL outputs,
7Ω typical output impedance
LVPECL clock input pair
PCLK/nPCLK supports the following input levels:
LVPECL, CML, SSTL
Maximum input frequency: 250MHz
Output skew: 120ps (maximum)
Part-to-part skew: 700ps (maximum)
Multiple frequency skew: 320ps (maximum)
Additive phase jitter, RMS: 0.19ps (typical)
3.3V core, 3.3V or 2.5V output supply modes-40°C to 85°C
ambient operating temperature
Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
Pin Assignment
DIV_SELA
DIV_SELB
DIV_SELC
nPCLK
PCLK
7mm x 7mm x 1.45mm package body
GND
V
nc
DD
1
2
3
4
5
6
7
8
32 31 30 29 28 27 26 25
9
10 11 12 13 14 15 16
32-Lead LQFP
ICS87946I-01
Y Package
Top View
©2009 Integrated Device Technology, Inc.
ICS87946I-01
24
23
22
21
20
19
18
17
GND
QB0
V
GND
QB2
V
V
QB1
DDB
DDB
DDC

Related parts for ICS87946AYI-01T

ICS87946AYI-01T Summary of contents

Page 1

... Pullup nPCLK ÷2 Pulldown DIV_SELA Pulldown DIV_SELB Pulldown DIV_SELC Pulldown MR/nOE ICS87946AYI-01 REVISION B NOVEMBER 10, 2009 LVPECL-To-LVCMOS/LVTTL ÷1, ÷2 Features • Ten single ended LVCMOS/LVTTL outputs, 7Ω typical output impedance • LVPECL clock input pair • PCLK/nPCLK supports the following input levels: LVPECL, CML, SSTL • ...

Page 2

... C Power Dissipation Capacitance PD R Input Pullup Resistor PULLUP R Input Pulldown Resistor PULLDOWN R Output Impedance OUT ICS87946AYI-01 REVISION B NOVEMBER 10, 2009 Type Description Unused No connect. Power Power supply pin. Input Pulldown Non-inverting differential LVPECL clock input. Input Pullup Inverting differential LVPECL clock input. ...

Page 3

... Parameter V Positive Supply Voltage Output Supply Voltage DDA, DDB, DDC I Power Supply Current Output Supply Current DDA, DDB, DDC ICS87946AYI-01 REVISION B NOVEMBER 10, 2009 LOW SKEW, ÷1, ÷2 LVPECL-TO-LVCMOS/LVTTL CLOCK GENERATOR DIV_SELC QA0:QA2 X X High-Impedance X X fIN fIN Active 1 X Active X 0 Active ...

Page 4

... Input High Current IH nPCLK PCLK I Input Low Current IL nPCLK V Peak-to-Peak Voltage PP V Common Mode Input Voltage; NOTE 1 CMR NOTE 1: Common mode input voltage is defined as V ICS87946AYI-01 REVISION B NOVEMBER 10, 2009 = 3.3V ± 5 DDA Test Conditions = -40°C to 85°C A Test Conditions V = 3.465V 3.465V ...

Page 5

... Output Rise/Fall Time R F odc Output Duty Cycle t Output Enable Time; NOTE Output Disable Time; NOTE 6 DIS For NOTES, please see Table 5A above. ICS87946AYI-01 REVISION B NOVEMBER 10, 2009 = 3.3V ± 5 DDA DDB DDC Test Conditions ƒ ≤ 250MHz Measured on rising edge at V Measured on rising edge at V ...

Page 6

... Often the noise floor of the equipment is higher than the noise floor of the device. This ICS87946AYI-01 REVISION B NOVEMBER 10, 2009 LOW SKEW, ÷1, ÷2 LVPECL-TO-LVCMOS/LVTTL CLOCK GENERATOR of the power in the 1Hz band to the power in the fundamental. When the required offset is specified, the phase noise is called a dBc value, which simply means dBm at a specified offset from the fundamental ...

Page 7

... Cross Points PP PCLK GND Differential Input Level V DDx 2 QX0:QXx V DDx 2 QX0:QXx tsk(b) Where X = Bank Bank Skew ICS87946AYI-01 REVISION B NOVEMBER 10, 2009 LOW SKEW, ÷1, ÷2 LVPECL-TO-LVCMOS/LVTTL CLOCK GENERATOR 2.05V¬±5 SCOPE LVCMOS 3.3V/2.5V Output Load AC Test Circuit Qx V CMR Qy Output Skew ...

Page 8

... Part 2 V DDO Qy 2 tsk(pp) Part-to-Part Skew 80% QAx, 20% QBx, QCx t R Output Rise/Fall Time ICS87946AYI-01 REVISION B NOVEMBER 10, 2009 LOW SKEW, ÷1, ÷2 LVPECL-TO-LVCMOS/LVTTL CLOCK GENERATOR nPCLK PCLK QAx, QBx, QCx Propagation Delay QAx, QBx, QCx 80% 20 Output Duty Cycle/Pulse Width/Period 8 V DDx ...

Page 9

... For example, if the input clock swing is only 2.5V and V = 3.3V, V_REF should be 1.25V and R2/ 0.609. ICS87946AYI-01 REVISION B NOVEMBER 10, 2009 LOW SKEW, ÷1, ÷2 LVPECL-TO-LVCMOS/LVTTL CLOCK GENERATOR Outputs: LVCMOS Outputs All unused LVCMOS output can be left floating. There should be no trace attached ...

Page 10

... SSTL R1 120 Figure 2E. PCLK/nPCLK Input Driven by an SSTL Driver ICS87946AYI-01 REVISION B NOVEMBER 10, 2009 The input interfaces suggested here are examples only. If the driver and is from another vendor, use their termination recommendation. PP Please consult with the vendor of the driver component to confirm the driver termination requirements ...

Page 11

... Multi-Layer PCB, JEDEC Standard Test Boards NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs. Transistor Count The transistor count for ICS87946I-01 is: 1204 ICS87946AYI-01 REVISION B NOVEMBER 10, 2009 LOW SKEW, ÷1, ÷2 LVPECL-TO-LVCMOS/LVTTL CLOCK GENERATOR θ vs. Air Flow ...

Page 12

... Basic D2 & E2 5.60 Ref. e 0.80 Basic L 0.45 0.60 θ 0° ccc Reference Document: JEDEC Publication 95, MS-026 ICS87946AYI-01 REVISION B NOVEMBER 10, 2009 LOW SKEW, ÷1, ÷2 LVPECL-TO-LVCMOS/LVTTL CLOCK GENERATOR Maximum 1.60 0.15 1.45 0.45 0.20 0.75 7° 0.10 12 ©2009 Integrated Device Technology, Inc. ...

Page 13

... IDT. IDT reserves the right to change any circuitry or specifications without notice. IDT does not authorize or warrant any IDT product for use in life support devices or critical medical instruments. ICS87946AYI-01 REVISION B NOVEMBER 10, 2009 LOW SKEW, ÷1, ÷2 LVPECL-TO-LVCMOS/LVTTL CLOCK GENERATOR Package ...

Page 14

... ICS87946AYI-01 REVISION B NOVEMBER 10, 2009 Description of Change Features section added Additive Phase Jitter and Lead-Free bullets AC Characteristics Tables - added Additive Phase Jitter row. Added Additive Phase Jitter section. Application Section - added Recommendations for Unused Input and Output Pins. Ordering Information Table - added lead-free Part/Order Number and Note. ...

Page 15

ICS87946I-01 6024 Silver Creek Valley Road Sales 800-345-7015 (inside USA) San Jose, California 95138 +408-284-8200 (outside USA) Fax: 408-284-2775 www.IDT.com/go/contactIDT DISCLAIMER Integrated Device Technology, Inc. (IDT) and its subsidiaries reserve the right to modify the products and/or specifications described herein ...

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