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NB4N840M Datasheet

3.3V 3.2Gb/s Dual Differential Clock/Data 2 x 2 Crosspoint Switch

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NB4N840M
3.3V 3.2Gb/s Dual
Differential Clock/Data 2 x 2
Crosspoint Switch with
CML Output and Internal
Termination
Description
The NB4N840M is a high−bandwidth fully differential dual
2 x 2 crosspoint switch with CML inputs/outputs that is suitable for
applications such as SDH/SONET, DWDM, Gigabit Ethernet and
high speed switching. Fully differential design techniques are used to
minimize jitter accumulation, crosstalk, and signal skew, which make
this device ideal for loop−through and protection channel switching
applications.
Internally terminated differential CML inputs accept AC−coupled
LVPECL (Positive ECL) or direct coupled CML signals. By providing
internal 50 W input and output termination resistor, the need for
external components is eliminated and interface reflections are
minimized. Differential 16 mA CML outputs provide matching
internal 50 W terminations, and 400 mV output swings when
externally terminated, 50 W to VCC.
Single−ended LVCMOS/LVTTL SEL inputs control the routing of
the signals through the crosspoint switch which makes this device
configurable as 1:2 fan−out, repeater or 2 x 2 crosspoint switch. The
device is housed in a low profile 5 x 5 mm 32−pin QFN package.
Features
Plug−in compatible to the MAX3840 and SY55859L
Maximum Input Clock Frequency 2.7 GHz
Maximum Input Data Frequency 3.2 Gb/s
225 ps Typical Propagation Delay
80 ps Typical Rise and Fall Times
7 ps Channel to Channel Skew
430 mW Power Consumption
< 0.5 ps RMS Jitter
7 ps Peak−to−Peak Data Dependent Jitter
Power Saving Feature with Disabled Outputs
Operating Range: VCC = 3.0 V to 3.6 V with VEE = 0 V
CML Output Level (400 mV Peak−to−Peak Output), Differential
Output
These are Pb−Free Devices
http://onsemi.com
MARKING
DIAGRAM
1 32
QFN32
MN SUFFIX
CASE 488AM
1
NB4N
840M
ALYWG
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G = Pb−Free Package
DA0
DA0
CML
DA1
DA1
CML
DB0
DB0
CML
0
CML
1
0
CML
1
0
CML
1
QA0
QA0
ENA0
SELA0
QA1
QA1
ENA1
SELA1
QB0
QB0
ENB0
SELB0
DB1
DB1
CML
0
CML
1
QB1
QB1
ENB1
SELB1
Figure 1. Functional Block Diagram
ORDERING INFORMATION
See detailed ordering and shipping information on page 8 of
this data sheet.
© Semiconductor Components Industries, LLC, 2014
August, 2014 − Rev. 5
1
Publication Order Number:
NB4N840M/D


  ON Semiconductor Electronic Components Datasheet  

NB4N840M Datasheet

3.3V 3.2Gb/s Dual Differential Clock/Data 2 x 2 Crosspoint Switch

No Preview Available !

NB4N840M
Table 1. TRUTH TABLE
SELA0/SELB0 SELA1/SELB1
LL
LH
HL
HH
XX
ENA0/ENA1 ENB0/ENB1
QA0/QB0
QA1/QB1
Function
HH
DA0/DB0
DA0/DB0
1:2 Fanout
HH
DA0/DB0
DA1/DB1
Quad Repeater
HH
DA1/DB1
DA0/DB0
Crosspoint Switch
HH
DA1/DB1
DA1/DB1
1:2 Fanout
L L Disable/Power Down Disable/Power Down No output (@ VCC)
ENB1 1
32 31 30 29 28 27
26 25
24 GND
DB1 2
23 VCC
DB1 3
22 QA0
ENB0 4
SELB0 5
DB0 6
NB4N840M
21 QA0
20 VCC
19 QA1
DB0 7
18 QA1
SELB1 8
17 VCC
9 10 11 12 13 14 15 16
Figure 2. Pin Configuration (Top View)
http://onsemi.com
2


Part Number NB4N840M
Description 3.3V 3.2Gb/s Dual Differential Clock/Data 2 x 2 Crosspoint Switch
Maker ON Semiconductor
Total Page 9 Pages
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