参数资料
型号: ICS853016AG
厂商: INTEGRATED DEVICE TECHNOLOGY INC
元件分类: 时钟及定时
英文描述: 853016 SERIES, LOW SKEW CLOCK DRIVER, 1 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO8
封装: 3 X 3 MM, 0.95 MM HEIGHT, MO-187, TSSOP-8
文件页数: 13/14页
文件大小: 410K
代理商: ICS853016AG
IDT / ICS 3.3V, 5V LVPECL FANOUT BUFFER
8
ICS853016AM REV. B
DECEMBER 6, 2007
ICS853016
LOW SKEW, 1-TO2, DIFFERENTIAL-TO-3.3V, 5V LVPECL/ECL FANOUT BUFFER
PRELIMINARY
The clock layout topology shown below is a typical termination
for LVPECL outputs. The two different layouts mentioned are
recommended only as guidelines.
FOUT and nFOUT are low impedance follower outputs that gen-
erate ECL/LVPECL compatible outputs. Therefore, terminating
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 dis-
tortion. 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 design-
ers simulate to guarantee compatibility across all printed circuit
and clock component process variations.
TERMINATION FOR 3.3V LVPECL OUTPUTS
FIGURE 2B. LVPECL OUTPUT TERMINATION
FIGURE 2A. LVPECL OUTPUT TERMINATION
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
TERMINATION FOR 5V LVPECL OUTPUT
This section shows examples of 5V LVPECL output termination.
Figure 3A shows standard termination for 5V LVPECL. The
termination requires matched load of 50
Ω resistors pull down to
Zo = 50 Ohm
R2
50
Zo = 50 Ohm
5V
3V
PECL
+
-
R1
50
5V
PECL
R4
84
5V
Zo = 50 Ohm
R3
84
R2
125
5V
PECL
+
-
Zo = 50 Ohm
R1
125
FIGURE 3A. STANDARD 5V LVPECL OUTPUT TERMINATION
FIGURE 3B. 5V LVPECL OUTPUT TERMINATION EXAMPLE
V
CC
- 2V = 3V at the receiver. Figure 3B shows Thevenin
equivalence of Figure
3A. In actual application where the 3V DC
power supply is not available, this approached is normally used.
相关PDF资料
PDF描述
ICS853016AMLFT 853016 SERIES, LOW SKEW CLOCK DRIVER, 1 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO8
ICS853016AGLF 853016 SERIES, LOW SKEW CLOCK DRIVER, 1 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO8
ICS853016AMLF 853016 SERIES, LOW SKEW CLOCK DRIVER, 1 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO8
ICS853017AMLF 853017 SERIES, LOW SKEW CLOCK DRIVER, 1 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO20
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