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  ON Semiconductor Electronic Components Datasheet  

NB4L858M Datasheet

Dual Differential Clock/Data 2x2 Crosspoint Switch

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NB4L858M
2.5V/3.3V, 3 GHz Dual
Differential Clock/Data 2x2
Crosspoint Switch with
CML Output and Internal
Termination
Description
The NB4L858M is a high−bandwidth low voltage fully differential
dual 2 x 2 crosspoint switch with CML outputs that is suitable for
applications such as SDH/SONET DWDM and high speed switching
applications. Design technique minimizes jitter accumulation,
crosstalk, and signal skew which make this device ideal for
loop−through and protection channel switching application. Each
2 x 2 crosspoint switch can fan out and/or multiplex up to 3 Gb/s data
and 3 GHz clock signals.
Differential inputs incorporate a pair of internal 50 W termination
resistors in a center−tapped configuration (VTDx Pins) and can accept
LVPECL (Positive ECL) or CML input signal without any external
component. This feature provides transmission line termination
on−chip, at the receiver end, eliminating external components.
Differential 16 mA CML output provides matching internal 50 W
terminations, and 400 mV output swings when externally terminated,
50 W to VCC.
The SELECT inputs are single−ended and can be driven with either
LVCMOS or LVTTL input levels. The device is housed in a low
profile 7 x 7 mm 32−pin LQFP package.
Features
Maximum Input Clock Frequency 3 GHz
Maximum Input Data Frequency 3 Gb/s
350 ps Typical Propagation Delay
80 ps Typical Rise and Fall Times
12 ps Channel to Channel Skew
0.5 ps RMS Jitter
5 ps Deterministic Jitter @ 2.5 Gb/s
Operating Range: VCC = 2.3V to 3.6 V with GND = 0 V
CML Output Level (400 mV Peak−to−Peak Output), Differential
Output
These are Pb−Free Devices
http://onsemi.com
MARKING
DIAGRAM*
LQFP−32
FA SUFFIX
CASE 873A
NB4L
858M
AWLYYWW
32
1
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
G = Pb−Free Package
*For additional marking information, refer to
Application Note AND8002/D.
SELA0
DA0
VTDA0
DA0
50W
50W
SELA1
DA1
VTDA1
DA1
50W
50W
0
QA0
A0
QA0
1
0
QA1
A1
QA1
1
SELB0
0
DB0
VTDB0
DB0
50W
50W
QB0
B0
QB0
1
SELB1
0
DB1
VTDB1
DB1
50W
50W
QB1
B1
QB1
1
Figure 1. Functional Block Diagram
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 8 of this data sheet.
© Semiconductor Components Industries, LLC, 2005
December, 2005 − Rev. 9
1
Publication Order Number:
NB4L858M/D


  ON Semiconductor Electronic Components Datasheet  

NB4L858M Datasheet

Dual Differential Clock/Data 2x2 Crosspoint Switch

No Preview Available !

NB4L858M
GND VCC QA0 QA0 VCC QA1 QA1 VCC
DA0
VTDA0
DA0
SELA1
DA1
VTDA1
DA1
SELA0
24 23 22 21 20 19 18 17
25 16
26 15
27 14
28
LQFP−32
29
13
12
30 11
31 10
32 9
12345678
VCC
QB1
QB1
VCC
QB0
QB0
VCC
GND
DB1 VTDB1 DB1 SELB0 DB0 VTDB0 DB0 SELB1
Figure 1. Pin Configuration (Top View)
Table 1. TRUTH TABLE
SELA0/SELB0
SELA1/SELB1
LL
LH
HL
HH
QA0/QB0
DA0/DB0
DA0/DB0
DA1/DB1
DA1/DB1
QA1/QB1
DA0/DB0
DA1/DB1
DA0/DB0
DA1/DB1
Function
1:2 Fanout or Redundant Distribution
Quad Repeater or Crosspoint Switch
Quad Repeater or Crosspoint Switch
1:2 Fanout or Redundant Distribution
http://onsemi.com
2


Part Number NB4L858M
Description Dual Differential Clock/Data 2x2 Crosspoint Switch
Maker ON Semiconductor
Total Page 10 Pages
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