参数资料
型号: ICS581G-01
元件分类: 时钟及定时
英文描述: 581 SERIES, PLL BASED CLOCK DRIVER, 4 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO16
封装: 4.40 MM, 0.65 MM PITCH, MO-153, TSSOP-16
文件页数: 3/9页
文件大小: 167K
代理商: ICS581G-01
Zero Delay Glitch-Free Clock Multiplexer
MDS 581-01/02 H
3
Revision 050206
Integrated Circuit Systems, Inc.
525 Race Street, San Jose, CA 95126 tel (408) 297-1201 www.icst.com
ICS581-01/02
Pin Descriptions
Device Operation
The ICS581-01 and ICS581-02 are very similar.
Following is a description of the operation of the
ICS581-01 and the differences of the ICS581-02.
The ICS581-01 is a PLL-based, zero delay, clock
multiplexer. The device consists of an input multiplexer
controlled by SELA that selects between two clock
inputs. The output of the mux drives the reference input
of a phase locked loop. The other input to the PLL
comes from a feedback input pin called FBIN. The
output of the PLL drives four low skew outputs. These
chip outputs are therefore buffered versions of the
selected input clock with zero delay and 50/50 duty
cycle.
For correct operation, one of the clock outputs must be
connected to FBIN. In this datasheet, CLK4 is shown
as the feedback, but any one of the four clock outputs
can be used. If output termination resistors are used,
the feedback should be connected before the resistor. It
is a property of the PLL used on this chip that it will
align rising edges on FBIN and either INA or INB
(depending on SELA). Since FBIN is connected to a
clock output, this means that the outputs appear to
align with the input with zero delay.
When the input select (SELA) is changed, the output
clock will change frequency and/or phase until it lines
up with the new input clock. This occurs in a smooth,
gradual manner without any short pulses or glitches
and will typically take a few tens of microseconds.
The part must be configured to operate in the correct
frequency range. The table on page two gives the
recommended range.
The four low skew outputs are controlled by two output
enable pins that allow either one, three, or four
simultaneous outputs. If both OE pins are low, the PLL
is powered down.
Pin
Number
Pin
Name
Pin
Type
Pin Description
1
S0
Input
Select 0 for frequency range. See table. Internal pull-up.
2
S1
Input
Select 1 for frequency range. See table. Internal pull-up.
3
VDD
Power
Power Supply. Connect to +3.3 V or +5 V.
4
INA
Input
Input Clock A.
5
INB
Input
Input Clock B.
6
GND
Power
Connect to ground.
7
FBIN
Input
Feedback input. Connect to a clock output.
8
OE0
Input
Output enable 0. See table. Internal pull-up.
9
OE1
Input
Output enable 1. See table. Internal pull-up.
10
GND
Power
Connect to ground.
11
CLK4
Output
Low skew clock output.
12
CLK3
Output
Low skew clock output.
13
CLK2
Output
Low skew clock output.
14
CLK1
Output
Low skew clock output.
15
VDD
Power
Power Supply. Connect to +3.3 V or +5 V.
16 (-01)
SELA
Input
Mux select. Selects INA when high. Internal pull-up.
16 (-02)
DIV
Input
Timeout select. See table. Internal pull-up.
相关PDF资料
PDF描述
ICS581G-02 581 SERIES, PLL BASED CLOCK DRIVER, 4 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO16
ICS581G-01ILF 581 SERIES, PLL BASED CLOCK DRIVER, 4 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO16
ICS581G-02I 581 SERIES, PLL BASED CLOCK DRIVER, 4 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO16
ICS601M-02IT 170 MHz, OTHER CLOCK GENERATOR, PDSO16
ICS650R-01ILF 80 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO20
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