NB100LVEP224
2.5V/3.3V 1:24 Differential
ECL/PECL Clock Driver with
Clock Select and Output
Enable
The NB100LVEP224 is a low skew 1-to-24 differential clock
driver, designed with clock distribution in mind, accepting two clock
sources into an input multiplexer. The part is designed for use in low
voltage applications which require a large number of outputs to drive
precisely aligned low skew signals to their destination. The two clock
inputs are differential ECL/PECL and they are selected by the
CLK_SEL pin. To avoid generation of a runt clock pulse when the
device is enabled/disabled, the Output Enable (OE) is synchronous
ensuring the outputs will only be enabled/disabled when they are
already in LOW state (See Figure 4).
The NB100LVEP224 guarantees low output-to-output skew. The
optimal design, layout, and processing minimize skew within a device
and from lot to lot. In any differential output, the same bias and
termination scheme is required. Unused output pairs should be left
unterminated (open) to 鈥渞educe power and switching noise as much as
possible.鈥?Any unused single line of a differential pair should be
terminated the same as the used line to maintain balanced loads on the
differential driver outputs. The wide VIHCMR specification allows
both pair of CLOCK inputs to accept LVDS levels.
The NB100LVEP224, as with most other ECL devices, can be
operated from a positive V
CC
supply in LVPECL mode. This allows
the LVEP224 to be used for high performance clock distribution in
+3.3 V or +2.5 V systems. Single-ended CLK input operation is
limited to a V
CC
鈮?/div>
3.0 V in LVPECL mode, or V
EE
鈮?/div>
-3.0 V in NECL
mode. In a PECL environment, series or Thevenin line terminations
are typically used as they require no additional power supplies. For
more information on PECL terminations, designers should refer to
Application Note AND8020/D.
http://onsemi.com
MARKING
DIAGRAM*
64
1
64
1
NB100
LVEP224
AWLYYWW
64-LEAD LQFP
CASE 848G
THERMALLY ENHANCED
FA SUFFIX
A
WL
YY
WW
= Assembly Location
= Wafer Lot
= Year
= Work Week
*For additional information, see Application Note
AND8002/D
ORDERING INFORMATION
Device
NB100LVEP224FA
Package
LQFP-64
Shipping
160 Units/Tray
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
NB100LVEP224FAR2 LQFP-64 1500/Tape & Reel
20 ps Typical Output-to-Output Skew
75 ps Typical Device-to- Device Skew
Maximum Frequency > 1 GHz
650 ps Typical Propagation Delay
LVPECL Mode Operating Range:
V
CC
= 2.375 V to 3.8 V with V
EE
= 0 V
鈥?/div>
NECL Mode Operating Range:
V
CC
= 0 V with V
EE
= -2.375 V to -3.8 V
鈥?/div>
Internal Input Pulldown Resistors
鈥?/div>
Q Output will Default Low with Inputs Open or at V
EE
鈥?/div>
Thermally Enhanced 64-Lead LQFP
鈥?/div>
CLOCK Inputs are LVDS-Compatible; Requires External 100
W
LVDS Termination Resistor
漏
Semiconductor Components Industries, LLC, 2003
1
June, 2003 - Rev. 4
Publication Order Number:
NB100LVEP224/D
next
NB100LVEP224FA 產(chǎn)品屬性
ON Semiconductor
時鐘驅(qū)動器及分配
ECL
+/- 3.8 V
+/- 2.375 V
+ 85 C
LQFP-64 Exposed Pad
Tray
1 GHz
- 40 C
SMD/SMT
2:1
2
160
ECL, LVDS, PECL
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