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ICS8725YT Datasheet

  • ICS8725YT

  • DIFFERENTIAL-TO-LVHSTL ZERO DELAY BUFFER

  • 7頁(yè)

  • ICS

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PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS8725
1-
TO
-5
D
IFFERENTIAL
-
TO
-LVHSTL Z
ERO
D
ELAY
B
UFFER
F
EATURES
鈥?/div>
Fully integrated PLL
鈥?/div>
5 LVHSTL outputs each with the ability to drive 50鈩?to
ground
鈥?/div>
Voh (max) = 1.2V
鈥?/div>
31.25MHz to 500MHz output frequency range
鈥?/div>
Spread Smart鈩?for regenerating spread spectrum clocks
鈥?/div>
Differential reference clock inputs accept any differential
input signal
鈥⒙?/div>
Differential reference clock inputs will accept single ended
input signal with one of the inputs biased with a resistor
network
鈥?/div>
31.25MHz to 622MHz input frequency range
鈥?/div>
LVCMOS / LVTTL control inputs
鈥?/div>
3.3V core, 1.8V output operating supply voltage
鈥?/div>
32 lead low-profile QFP (LQFP), 7mm x 7mm x 1.4mm
package body, 0.8mm package lead pitch
鈥?/div>
0擄C to 70擄C ambient operating temperature
鈥?/div>
Industrial temperature version available upon request
G
ENERAL
D
ESCRIPTION
The ICS8725 is a high performance LVHSTL
zero delay buffer and a member of the
HiPerClockS鈩?/div>
HiPerClockS鈩?family of High Performance
Clocks Solutions from ICS. The VCO operates
at a frequency range of 250MHz to 500MHz.
Utilizing one of the outputs as feedback to the PLL output
frequencies up to 500MHz can be regenerated with zero
delay with respect to the input. Dual reference clock inputs
support redundant clock or multiple reference applications.
,&6
B
LOCK
D
IAGRAM
P
IN
A
SSIGNMENT
PLL_SEL
VDDO
VDDA
VDDi
VEE
VEE
nQ4
Q4
DIV_SEL0
DIV_SEL1
Q0
nQ0
Q1
nQ1
Q2
nQ2
Q3
nQ3
Q4
nQ4
DIV_SEL0
DIV_SEL1
REF_CLK1
nREF_CLK1
REF_CLK2
nREF_CLK2
REF_SEL
MR
1
2
3
4
5
6
7
8
32 31 30 29 28 27 26 25
24
23
22
VDDO
Q3
nQ3
Q2
nQ2
Q1
nQ1
VDDO
REF_CLK1
nREF_CLK1
REF_CLK2
nREF_CLK2
REF_SEL
REF_DIV
FB_IN
nFB_IN
PLL_SEL
MR
0
1
梅8
0
1
PLL
0
1
梅1
梅2
梅4
梅8
ICS8725
21
20
19
18
17
9 10 11 12 13 14 15 16
VDDI
nFB_IN
FB_IN
REF_DIV
VEE
nQ0
Q0
VDDO
32-Lead LQFP
Y Package
Top View
The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on initial
product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice.
8725
www.icst.com/products/hiperclocks.html
1
REV. A MARCH 5, 2001

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