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ICS8431CM-11T Datasheet

  • ICS8431CM-11T

  • 255MHZ, LOW JITTER, LVPECL FREQUENCY SYNTHESIZER

  • 13頁

  • ICS

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Integrated
Circuit
Systems, Inc.
ICS8431-11
255MH
Z
, L
OW
J
ITTER
,
LVPECL F
REQUENCY
S
YNTHESIZER
F
EATURES
鈥?/div>
Fully integrated PLL
鈥?/div>
Differential 3.3V LVPECL output
鈥?/div>
Programmable PLL loop divider for generating a variety of
output frequencies.
鈥?/div>
Crystal oscillator interface
鈥?/div>
Spread Spectrum Clocking (SSC) fixed at 1/2% modulation
for environments requiring ultra low EMI
鈥?/div>
Typical RMS cycle-to-cycle jitter 2.6 ps
鈥?/div>
LVTTL / LVCMOS control inputs
鈥?/div>
PLL bypass modes supporting in-circuit testing and on-chip
functional block characterization
鈥?/div>
3.3V supply voltage
鈥?/div>
28 lead SOIC
鈥?/div>
0擄C to 85擄C ambient operating temperature
G
ENERAL
D
ESCRIPTION
The ICS8431-11 is a general purpose clock
frequency synthesizer for IA64/32 application and
HiPerClockS鈩?/div>
a member of the HiPerClockS鈩?family of High
Performance Clock Solutions from ICS. The VCO
operates at a frequency range of 190MHz to
510MHz providing an output frequency range of 95MHz to
255MHz. The output frequency can be programmed using the
parallel interface, M0 thru M8, to the configuration logic.
Spread spectrum clocking is programmed via the control
inputs SSC_CTL0 and SSC_CTL1.
,&6
Programmable features of the ICS8431-11 support four
operational modes. The four modes are spread spectrum
clocking (SSC), non-spread spectrum clock and two test
modes which are controlled by the SSC_CTL[1:0] pins. Un-
like other synthesizers, the ICS8431-11 can immediately
change spread-spectrum operation without having to reset
the device.
In SSC mode, the output clock is modulated in order to
achieve a reduction in EMI. In one of the PLL bypass test
modes, the PLL is disconnected as the source to the
differential output allowing an external source to be
connnected to the TEST_I/O pin. This is useful for in-
circuit testing and allows the differential output to be driven
at a lower frequency throughout the system clock tree. In the
other PLL bypass mode, the oscillator divider is used as the
source to both the M and the Fout divide by 2. This is useful
for characterizing the oscillator and internal dividers.
B
LOCK
D
IAGRAM
XTAL1
OSC
XTAL2
梅
16
P
IN
A
SSIGNMENT
M0
M1
M2
M3
M4
M5
M6
M7
M8
SSC_CTL0
SSC_CTL1
VEE
TEST_I/O
VDD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
nP_LOAD
VDDI
XTAL2
XTAL1
nc
nc
VDDA
VEE
MR
nc
VDDO
FOUT
nFOUT
VEE
PHASE
DETECTOR
PLL
VCO
梅
M
梅
2
FOUT
nFOUT
ICS8431-11
TEST_I/O
M0:M8
Configuration
Logic
SSC
Control
Logic
28-Lead SOIC
M Package
Top View
nP_LOAD
ICS8431CM-11
SSC_CTL0 SSC_CTL1
www.icst.com/products/hiperclocks.html
1
REV. A JULY 11, 2001

ICS8431CM-11T相關(guān)型號PDF文件下載

  • 型號
    版本
    描述
    廠商
    下載
  • 英文版
    LOW SKEW, 1-TO-2 LVCMOS / LVTTL FANOUT BUFFER
    ICS
  • 英文版
    LOW SKEW, 1-TO-2 LVCMOS / LVTTL FANOUT BUFFER
    ICST [Inte...
  • 英文版
    LOW SKEW, 1-TO-4 LVCMOS / LVTTL FANOUT BUFFER
    ICSI
  • 英文版
    LOW SKEW, 1-TO-4 LVCMOS / LVTTL FANOUT BUFFER
    ICST [Inte...
  • 英文版
    LOW SKEW, 1-TO-4, MULTIPLEXED DIFFERENTIAL/ LVCMOS-TO-LVCMOS...
    ICS
  • 英文版
    LOW SKEW, 1-TO-4, MULTIPLEXED DIFFERENTIAL/ LVCMOS-TO-LVCMOS...
    ICST [Inte...
  • 英文版
    LOW SKEW, 1-TO-12 LVCMOS / LVTTL FANOUT BUFFER
    ICSI
  • 英文版
    LOW SKEW, 1-TO-12 LVCMOS / LVTTL FANOUT BUFFER
    ICST [Inte...
  • 英文版
    LOW SKEW, 1-TO-16, LVCMOS / LVTTL FANOUT BUFFER W/1.2V LVCMO...
    ICST [Inte...
  • 英文版
    Low Skew 1-to-16 Fanout Buffer
    ICS
  • 英文版
    Low Skew 1-to-16 Fanout Buffer
    ICST [Inte...
  • 英文版
    LOW SKEW, 1-TO-24 DIFFERENTIAL-TO-LVCMOS FANOUT BUFFER
    ICS
  • 英文版
    LOW SKEW, 1-TO-24 DIFFERENTIAL-TO-LVCMOS FANOUT BUFFER
    ICST [Inte...
  • 英文版
    350MHZ, CRYSTAL-TO-LVCMOS / LVTTL FREQUENCY SYNTHESIZER
    ICS
  • 英文版
    350MHZ, CRYSTAL-TO-LVCMOS / LVTTL FREQUENCY SYNTHESIZER
    ICST [Integrate...
  • 英文版
    700MHZ, CRYSTAL OSCILLATOR-TO-DIFFERENTIAL LVDS FREQUENCY SY...
    ICSI
  • 英文版
    700MHZ, CRYSTAL OSCILLATOR-TO-DIFFERENTIAL LVDS FREQUENCY SY...
    ICST [Integrate...
  • 英文版
    Low Skew 1-to-16 Differential Current Mode Fanout Buffer
    ICS
  • 英文版
    Low Skew 1-to-16 Differential Current Mode Fanout Buffer
    ICST [Integrate...
  • 英文版
    LOW SKEW, 1-TO-16 DIFFERENTIAL-TO-LVDS CLOCK DISTRIBUTION CH...
    ICS

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