ics87931i-147 Integrated Device Technology, ics87931i-147 Datasheet

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ics87931i-147

Manufacturer Part Number
ics87931i-147
Description
Low Skew, 1-to-6 Lvcmos/lvttl Clock Multiplier/zero Delay Buffer
Manufacturer
Integrated Device Technology
Datasheet
B
LOW SKEW, 1-TO-6 LVCMOS/LVTTL
CLOCK MULTIPLIER/ZERO DELAY BUFFER
IDT
G
ICS87931I is targeted for high performance clock applications.
Along with a fully integrated PLL, the ICS87931I-147 contains
frequency configurable outputs and an external feedback in-
put for regenerating clocks with “zero delay”.
Selectable clock inputs, CLK1 and differential CLK0, nCLK0
support redundant clock applications. The CLK_SEL input de-
termines which reference clock is used. The output divider val-
ues of Bank A, B and C are controlled by the DIV_SELA,
DIV_SELB and DIV_SELC, respectively.
For test and system debug purposes, the PLL_SEL input al-
lows the PLL to be bypassed. When LOW, the nMR input re-
sets the internal dividers and forces the outputs to the high
impedance state.
The effective fanout of the ICS87931I-147 can be increased to
12 by utilizing the ability of each output to drive two series
terminated transmission lines.
POWER_DN
EXTFB_SEL
HiPerClockS™
DIV_SELC
DIV_SELA
DIV_SELB
CLK_EN0
CLK_EN1
CLK_SEL
IC S
LOCK
PLL_SEL
ENERAL
EXT_FB
nCLK0
/ ICS
CLK1
CLK0
nMR
LVCMOS CLOCK MULTIPLIER/ZERO DELAY BUFFER
Pullup
None
Pullup
Pulldown
Pullup
D
Pullup
Pulldown
Pullup
Pulldown
Pullup
Pulldown
Pullup
Pullup
Pulldown
The ICS87931I-147 is a low voltage, low skew
LVCMOS/LVTTL Clock Multiplier/ Zero Delay
Buffer and a member of the HiPerClock S ™
family of High Performance Clock Solutions from
ICS. With output frequencies up to 240MHz, the
IAGRAM
D
ESCRIPTION
1
0
1
0
POWER-ON RESET
DETECTOR
PHASE
LPF
÷8
VCO
0
1
DISABLE
LOGIC
1
F
• Fully integrated PLL
• Six LVCMOS/LVTTL outputs, 7Ω typical output impedance
• Selectable differential CLK0, nCLK0 or LVCMOS/LVTTL clock
• Maximum output frequency: 240MHz
• VCO range: 220MHz to 480MHz
• External feedback for “zero delay” clock regeneration
• Output skew: 165ps (maximum)
• Cycle-to-cycle jitter: 45ps (maximum)
• 3.3V supply voltage
• -40°C to 85°C ambient operating temperature
• Available in both standard (RoHS 5) and lead-free (RoHS 6)
P
÷2
for redundant clock applications
packages
EATURES
IN
0
1
A
SSIGNMENT
POWER_DN
nCLK0
CLK1
CLK0
GND
nMR
V
DDA
nc
÷2/÷4
÷2/÷4
÷4/÷6
1
2
3
4
5
6
7
8
ICS87931AYI-147 REV. A MARCH 29, 2007
32 31 30 29 28 27 26 25
9 10 11 12 13 14 15 16
7mm x 7mm x 1.4mm
ICS87931I-147
32-Lead LQFP
package body
Y package
Top View
QA0
QA1
QB0
QB1
QC0
QC1
ICS87931I-147
24
23
22
21
20
19
18
17
GND
QB0
QB1
V
EXTFB_SEL
CLK_SEL
PLL_SEL
nc
DDO

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ics87931i-147 Summary of contents

Page 1

... PLL to be bypassed. When LOW, the nMR input re- sets the internal dividers and forces the outputs to the high impedance state. The effective fanout of the ICS87931I-147 can be increased utilizing the ability of each output to drive two series terminated transmission lines. ...

Page 2

... ICS87931I-147 LOW SKEW, 1-TO-6 LVCMOS/LVTTL CLOCK MULTIPLIER/ZERO DELAY BUFFER ABLE IN ESCRIPTIONS ...

Page 3

... ICS87931I-147 LOW SKEW, 1-TO-6 LVCMOS/LVTTL CLOCK MULTIPLIER/ZERO DELAY BUFFER T 3A ABLE ONTROL NPUT UNCTION ...

Page 4

... ICS87931I-147 LOW SKEW, 1-TO-6 LVCMOS/LVTTL CLOCK MULTIPLIER/ZERO DELAY BUFFER VCO VCO/2 POWER_DN QA(÷2) QB(÷4) QC(÷ CLK_EN0 CLK_EN1 QA(÷2) QB(÷4) QC(÷6) CLK_EN0 CLK_EN1 IDT ™ / ICS ™ LVCMOS CLOCK MULTIPLIER/ZERO DELAY BUFFER F 1A. POWER_DN T D IGURE IMING IAGRAM F 1B. CLK_EN T D IGURE ...

Page 5

... ICS87931I-147 LOW SKEW, 1-TO-6 LVCMOS/LVTTL CLOCK MULTIPLIER/ZERO DELAY BUFFER BSOLUTE AXIMUM ATINGS Supply Voltage Inputs, V -0. Outputs, V -0. Package Thermal Impedance, θ JA Storage Temperature, T -65°C to 150°C STG T 5A ABLE OWER UPPLY HARACTERISTICS ...

Page 6

... ICS87931I-147 LOW SKEW, 1-TO-6 LVCMOS/LVTTL CLOCK MULTIPLIER/ZERO DELAY BUFFER T 6. PLL ABLE NPUT EFERENCE HARACTERISTICS ...

Page 7

... ICS87931I-147 LOW SKEW, 1-TO-6 LVCMOS/LVTTL CLOCK MULTIPLIER/ZERO DELAY BUFFER P ARAMETER 1.65V±5% V DDA, V DDO LVCMOS GND GND = -1.165V±5% 3. UTPUT OAD EST IRCUIT V DDO DDO 2 Qy tsk( UTPUT KEW 2V 0.8V Clock t Outputs UTPUT ISE ALL IME V QAx, QBx, QCx ...

Page 8

... ICS87931I-147 LOW SKEW, 1-TO-6 LVCMOS/LVTTL CLOCK MULTIPLIER/ZERO DELAY BUFFER IRING THE IFFERENTIAL NPUT TO Figure 2 shows how the differential input can be wired to accept single ended levels. The reference voltage V_REF = V generated by the bias resistors R1, R2 and C1. This bias circuit should be located as close as possible to the input pin. The ratio ...

Page 9

... ICS87931I-147 LOW SKEW, 1-TO-6 LVCMOS/LVTTL CLOCK MULTIPLIER/ZERO DELAY BUFFER IFFERENTIAL LOCK NPUT NTERFACE The CLK /nCLK accepts LVDS, LVPECL, LVHSTL, SSTL, HCSL and other differential signals. The signals must meet the V V input requirements. Figures show interface examples CMR for the HiPerClockS CLK/nCLK input driven by the most common driver types ...

Page 10

... VDDA POWER_DN 3 POWER_DN 4 CLK1 5 nMR EXTFB_SEL 6 CLK0 CLK_SEL 7 nCLK0 PLL_SEL 8 GND R8 R9 ICS87931I ICS87931I-147 50 50 R10 50 (U1-13) VDD=3. Space (i.e. not intstalled) F 4A. ICS87931I-147 S IGURE CHEMATIC 10 pin as possible. DDA VDD VDD 24 GND QB0 QB1 21 VDDO ...

Page 11

... Make sure no other signal traces are routed between the clock trace pair. • The series termination resistors should be located as close to the driver pins as possible. 50 Ohm Trace Pin Ohm Trace F 4B. PCB IGURE OARD AYOUT OR 11 GND VCC VIA Other signals C2 ICS87931I-147 ICS87931AYI-147 REV. A MARCH 29, 2007 ...

Page 12

... F T ABLE VS IR LOW ABLE FOR JA Multi-Layer PCB, JEDEC Standard Test Boards T C RANSISTOR OUNT The transistor count for ICS87931I-147 is: 2942 Pin compatible with MPC931, MPC9331 IDT ™ / ICS ™ LVCMOS CLOCK MULTIPLIER/ZERO DELAY BUFFER R I ELIABILITY NFORMATION 32 L LQFP EAD θ ...

Page 13

... ICS87931I-147 LOW SKEW, 1-TO-6 LVCMOS/LVTTL CLOCK MULTIPLIER/ZERO DELAY BUFFER ACKAGE UTLINE UFFIX FOR ABLE Reference Document: JEDEC Publication 95, MS-026 IDT ™ / ICS ™ LVCMOS CLOCK MULTIPLIER/ZERO DELAY BUFFER LQFP EAD D ACKAGE IMENSIONS ...

Page 14

... ICS87931I-147 LOW SKEW, 1-TO-6 LVCMOS/LVTTL CLOCK MULTIPLIER/ZERO DELAY BUFFER T 10 ABLE RDERING NFORMATION ...

Page 15

... ICS87931I-147 LOW SKEW, 1-TO-6 LVCMOS/LVTTL CLOCK MULTIPLIER/ZERO DELAY BUFFER Innovate with IDT and accelerate your future networks. Contact: www.IDT.com For Sales 800-345-7015 408-284-8200 Fax: 408-284-2775 Corporate Headquarters Integrated Device Technology, Inc. 6024 Silver Creek Valley Road San Jose, CA 95138 United States 800 345 7015 +408 284 8200 (outside U.S.) © ...

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