参数资料
型号: ICS8535BKI-01LFT
元件分类: 时钟及定时
英文描述: 8535 SERIES, LOW SKEW CLOCK DRIVER, 4 TRUE OUTPUT(S), 4 INVERTED OUTPUT(S), QCC20
封装: ROHS COMPLIANT, 4 X 4 MM, 0.95 MM HEIGHT, MO-220, VFQFN-20
文件页数: 13/14页
文件大小: 194K
代理商: ICS8535BKI-01LFT
8535BGI-01
www.icst.com/products/hiperclocks.html
REV. A MARCH 21, 2006
8
Integrated
Circuit
Systems, Inc.
ICS8535BI-01
LOW SKEW, 1-TO-4
LVCMOS/LVTTL-TO-3.3V LVPECL FANOUT BUFFER
PRELIMINARY
APPLICATION INFORMATION
V
CC - 2V
50
Ω
50
Ω
RTT
Z
o = 50Ω
Z
o = 50Ω
FOUT
FIN
RTT =
Z
o
1
((V
OH + VOL) / (VCC – 2)) – 2
3.3V
125
Ω
125
Ω
84
Ω
84
Ω
Z
o = 50Ω
Z
o = 50Ω
FOUT
FIN
The clock layout topology shown below is a typical termina-
tion for LVPECL outputs. The two different layouts mentioned
are recommended only as guidelines.
FOUT and nFOUT are low impedance follower outputs that
generate ECL/LVPECL compatible outputs. Therefore, termi-
nating resistors (DC current path to ground) or current sources
must be used for functionality. These outputs are designed to
drive 50
Ω transmission lines. Matched impedance techniques
should be used to maximize operating frequency and minimize
signal distortion. Figures 2A and 2B show two different layouts
which are recommended only as guidelines. Other suitable
clock layouts may exist and it would be recommended that the
board designers simulate to guarantee compatibility across all
printed circuit and clock component process variations.
FIGURE 2B. LVPECL OUTPUT TERMINATION
FIGURE 2A. LVPECL OUTPUT TERMINATION
TERMINATION FOR LVPECL OUTPUTS
INPUTS:
CLK INPUT:
For applications not requiring the use of a clock input, it can
be left floating. Though not required, but for additional
protection, a 1k
Ω resistor can be tied from the CLK input to
ground.
LVCMOS CONTROL PINS:
All control pins have internal pull-ups or pull-downs; additional
resistance is not required but can be added for additional
protection. A 1k
Ω resistor can be used.
RECOMMENDATIONS FOR UNUSED INPUT AND OUTPUT PINS
OUTPUTS:
LVPECL OUTPUT
All unused LVPECL outputs can be left floating. We
recommend that there is no trace attached. Both sides of the
differential output pair should either be left floating or
terminated.
相关PDF资料
PDF描述
ICS8536AGI-33LFT 266 MHz, OTHER CLOCK GENERATOR, PDSO20
ICS8536CGI-33T 266 MHz, OTHER CLOCK GENERATOR, PDSO20
ICS8536CGI-33LF 266 MHz, OTHER CLOCK GENERATOR, PDSO20
ICS8537AY-01LFT 8537 SERIES, LOW SKEW CLOCK DRIVER, 2 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP48
ICS8537AY-01T 8537 SERIES, LOW SKEW CLOCK DRIVER, 2 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP48
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