MAX3840_07 [MAXIM]
+3.3V, 2.7Gbps Dual 2 ✕ 2 Crosspoint Switch; + 3.3V ， 2.7Gbps的双通道2 ✕ 2交叉点开关
| 型号： | MAX3840_07 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | +3.3V, 2.7Gbps Dual 2 ✕ 2 Crosspoint Switch |
| 文件： | 总8页 (文件大小：121K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1854; Rev 5; 9/07
✕
+3.3V, 2.7Gbps Dual 2 2 Crosspoint Switch
General Description
Features
✕
The MAX3840 is a dual 2 2 asynchronous crosspoint
✕ Single +3.3V Supply
switch for SDH/SONET DWDM and other high-speed
data switching applications where serial data stream
loop-through and protection channel switching are
required. It is ideal for OC-48 systems with forward
error correction. A high-bandwidth, fully differential sig-
nal path minimizes jitter accumulation, crosstalk, and
✕ 460mW Power Consumption
✕ 2ps
✕ 7ps
Random Jitter
RMS
Deterministic Jitter
P-P
✕ Power-Down Feature for Deselected Outputs
✕ CML Inputs/Outputs
✕
signal skew. Each 2 2 crosspoint switch can fan out
and/or multiplex up to 2.7Gbps data and 2.7GHz clock
signals. All inputs and outputs are current mode logic
(CML) compatible and easily adaptable to interface
with an AC-coupled LVPECL signal. When not used,
each CML output stage can be powered down with an
enable control to conserve power. The typical power
consumption is 460mW with all outputs enabled.
✕ 6ps Channel-to-Channel Skew
✕ 100ps Output Edge Speed
✕
✕ 5mm 5mm 32 QFN or Thin QFN Package
The MAX3840 is compatible with the MAX3876
2.5Gbps clock and data recovery (CDR) circuit.
Ordering Information
The MAX3840 is available in a 32-pin exposed-pad
✕
QFN package (5mm 5mm footprint) and operates
PIN-
PACKAGE
PKG
CODE
PART
TEMP RANGE
from a +3.3V supply over a temperature range of -40°C
to +85°C.
MAX3840ETJ+ -40°C to +85°C
MAX3840EGJ -40°C to +85°C
+Denotes a lead-free package.
32 TQFN
32 QFN
T3255-3
G3255-1
________________________Applications
SDH/SONET and DWDM Transport Systems
Add-Drop Multiplexers
ATM Switch Cores
WDM Cross-Connects
Pin Configurations appear at end of data sheet.
High-Speed Backplanes
Typical Application Circuit
VCC = +3.3V
MAX3869
DATA
MAX3866
TIA AND LA
MAX3876
CDR
LASER
DRIVER
CLOCK
MAX3840
CROSSPOINT
SWITCH
MAX3869
LASER
DATA
MAX3866
TIA AND LA
MAX3876
CDR
DRIVER
CLOCK
Z
= 50Ω TRANSMISSION LINE
O
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
✕
+3.3V, 2.7Gbps Dual 2 2 Crosspoint Switch
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
.............................................-0.5V to +5.0V
32-Pin QFN
CC
Input Voltage (CML) .........................(VCC - 1.0) to (V
TTL Control Input Voltage...........................-0.5V to (V
Output Currents (CML) .......................................................22mA
+ 0.5V)
+ 0.5V)
(derate 21.3mW/°C above +85°C).................................1.38W
Operating Temperature Range ...........................-40°C to +85°C
Operating Junction Temperature Range...........-55°C to +150°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
CC
CC
Continuous Power Dissipation (T = +85°C)
A
32-Pin TQFN
(derate 21.3mW/°C above +85°C).................................1.38W
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(V
= +3.0V to +3.6V, T = -40°C to +85°C. Typical values are at V
= +3.3V, T = +25°C, unless otherwise noted.)
CC A
CC
A
MIN
TYP
MAX
PARAMETER
Supply Current
SYMBOL
CONDITIONS
All outputs enabled
UNITS
140
190
I
mA
CC
CML INPUT AND OUTPUT SPECIFICATIONS
CML Differential Output Swing
640
85
800
100
1000
115
R = 50Ω to V (Figure 2)
mV
P-P
L
CC
Differential Output Impedance
Ω
CML Output Common-Mode
Voltage
R = 50Ω to V
V
- 0.2
CC
V
V
L
CC
CML Single-Ended Input
Voltage Range
V
V
- 0.8
V
CC
+ 0.5
IS
CC
CML Differential Input Voltage
Swing
300
2000
57.5
mV
P-P
CML Single-Ended Input
Impedance
42.5
2.0
50
Ω
TTL SPECIFICATIONS
TTL Input High Voltage
TTL Input Low Voltage
TTL Input High Current
TTL Input Low Current
V
V
IH
V
0.8
+10
V
IL
I
-10
-10
µA
µA
IH
I
+10
IL
2
_______________________________________________________________________________________
✕
+3.3V, 2.7Gbps Dual 2 2 Crosspoint Switch
AC ELECTRICAL CHARACTERISTICS
(V
= +3.0V to +3.6V, T = -40°C to +85°C. Typical values are at V
= +3.3V, T = +25°C, unless otherwise noted.) (Note 1)
CC A
CC
A
MIN
TYP
MAX
PARAMETER
SYMBOL
CONDITIONS
UNITS
CML Input and Output Data
Rate
2.7
Gbps
CML Input and Output Clock
Rate
2.7
GHz
ps
CML Output Rise and Fall Time
CML Output Random Jitter
t , t
20% to 80%
(Note 2)
100
2
136
r
f
RJ
DJ
ps
RMS
CML Output Deterministic Jitter
CML Output Differential Skew
(Note 3)
7
20
25
ps
P-P
t
t
Any differential pair
7
ps
skew1
CML Output Channel-to-
Channel Skew
Any two outputs
15
40
ps
ps
skew2
Propagation Delay from Input-
to-Output
t
d
185
CML Differential Output Swing
for 2.7Gbps Input Data
R = 50Ω to V
(Note 4)
L
CC
CC
600
520
mV
P-P
P-P
CML Differential Output Swing
for 2.7GHz Input Clock
R = 50Ω to V
L
mV
(Note 5)
Note 1: AC characteristics are guaranteed by design and characterization.
Note 2: Measured with 100mV noise (f ≤ 2MHz) on the power supply.
P-P
Note 3: Deterministic jitter (DJ) is the arithmetic sum of pattern-dependent jitter and pulse-width distortion.
Note 4: Measured with 300mV
Note 5: Measured with 300mV
differential 1010... data pattern driving the inputs.
differential clock at 2.7GHz driving the inputs.
P-P
P-P
_______________________________________________________________________________________
3
✕
+3.3V, 2.7Gbps Dual 2 2 Crosspoint Switch
Typical Operating Characteristics
(V
= +3.3V, T = +25°C, unless otherwise noted.)
A
CC
SUPPLY CURRENT vs. TEMPERATURE
CML DIFFERENTIAL VOLTAGE
160
800
750
700
650
600
550
500
450
400
350
300
4 OUTPUTS ENABLED
140
3 OUTPUTS ENABLED
120
2 OUTPUTS ENABLED
100
1 OUTPUT ENABLED
80
0 OUTPUTS ENABLED
60
40
20
0
250
200
-50 -30 -10
10
50
70
90
-50 -30 -10
10
50
70
90
30
30
TEMPERATURE (°C)
TEMPERATURE (°C)
CHANNEL-TO-CHANNEL SKEW
vs. TEMPERATURE
2.7Gbps EYE DIAGRAM
20
18
16
14
12
10
8
23
INPUT = 2 - 1PRBS
CHANNEL B
6
4
2
CHANNEL A
0
-50 -30 -10
10
30
50
70
90
54ps/div
TEMPERATURE (°C)
4
_______________________________________________________________________________________
✕
+3.3V, 2.7Gbps Dual 2 2 Crosspoint Switch
Pin Description
PIN
NAME
FUNCTION
1
ENB1
Channel B1 Output Enable, TTL Input. A TTL low input powers down B1 output stage.
2
DIB1+
DIB1-
ENB0
SELB0
DIB0+
DIB0-
SELB1
GND
Channel B1 Positive Signal Input, CML
3
Channel B1 Negative Signal Input, CML
4
Channel B0 Output Enable, TTL Input. A TTL low input powers down B0 output stage.
Channel B0 Output Select, TTL Input. See Table 1.
Channel B0 Positive Signal Input, CML
5
6
7
Channel B0 Negative Signal Input, CML
8
Channel B1 Output Select, TTL Input. See Table 1.
Supply Ground
9, 24
10, 13, 16, 17,
20, 23
V
Positive Supply
CC
11
12
14
15
18
19
21
22
25
26
27
28
29
30
31
32
DOB0-
DOB0+
DOB1-
DOB1+
DOA1-
DOA1+
DOA0-
DOA0+
SELA1
DIA0+
DIA0-
Channel B0 Negative Output, CML
Channel B0 Positive Output, CML
Channel B1 Negative Output, CML
Channel B1 Positive Output, CML
Channel A1 Negative Output, CML
Channel A1 Positive Output, CML
Channel A0 Negative Output, CML
Channel A0 Positive Output, CML
Channel A1 Output Select, TTL Input. See Table 1.
Channel A0 Positive Signal Input, CML
Channel A0 Negative Signal Input, CML
SELA0
ENA0
Channel A0 Output Select, TTL Input. See Table 1.
Channel A0 Output Enable, TTL Input. A TTL low input powers down A0 output stage.
Channel A1 Positive Signal Input, CML
DIA1+
DIA1-
Channel A1 Negative Signal Input, CML
ENA1
Channel A1 Output Enable, TTL Input. A TTL low input powers down A1 output stage.
Ground. The exposed pad must be soldered to the circuit board ground for proper
electrical and thermal operation.
EP
Exposed Pad
_______________________________________________________________________________________
5
✕
+3.3V, 2.7Gbps Dual 2 2 Crosspoint Switch
Table 1. Output Routing
ROUTING CONTROLS
OUTPUT CONTROLS
OUTPUT SIGNALS
SELA0/SELB0
SELA1/SELB1 ENA0/ENA1 ENB0/ENB1
Signal at DOA0/DOB0
Signal at DOA1/DOB1
DIA0/DIB0
0
0
1
1
X
0
1
0
1
X
1
1
1
1
0
1
1
1
1
0
DIA0/DIB0
DIA0/DIB0
DIA1/DIB1
DIA1/DIB1
Power Down
DIA1/DIB1
DIA0/DIB0
DIA1/DIB1
Power Down
DIA0+
DIA0-
CML+
CML
DOA0+
0
1
CML
DOA0-
ENA0
SELA0
500mV
MAX
320mV MIN
DOA1+
0
1
CML
DIA1+
DIA1-
CML
CML
DOA1-
ENA1
CML-
SELA1
DIB0+
DIB0-
DOB0+
0
1
CML
CML
DOB0-
ENB0
640mV
MIN
SELB0
1000mV
MAX
DOB1+
0
1
DIB1+
DIB1-
(CML+) - (CML-)
CML
DOB1-
ENB1
SELB1
Figure 1. Functional Block Diagram
Figure 2. CML Output Levels
CML Inputs and Outputs
_______________ Detailed Description
CML is used to simplify high-speed interfacing. On-
chip input and output terminations minimize the number
of external components required while improving signal
integrity. The CML output signal swing is small, result-
ing in lower power consumption. The internal 50Ω input
and output terminations minimize reflections and elimi-
nate the need for external terminations.
The block diagram in Figure 1 shows the MAX3840
architecture. The SELA_ and SELB_ pins control the rout-
ing of the signals through the crosspoint switch. Each
output of the crosspoint switch drives a CML output dri-
ver. Each of the outputs, DOA_ and DOB_, is enabled or
disabled by the respective ENA_ and ENB_ pins.
6
_______________________________________________________________________________________
✕
+3.3V, 2.7Gbps Dual 2 2 Crosspoint Switch
Layout Techniques
Applications Information
For best performance, use good high-frequency layout
Interfacing PECL Inputs and
Outputs to the MAX3840
For information on interfacing with CML, refer to Maxim
Application Note HFAN-01.0, Introduction to LVDS,
PECL, and CML.
techniques, filter V
supplies, and keep ground con-
CC
nections short. Use multiple vias where possible. Also,
use controlled-impedance transmission lines to inter-
face with the MAX3840 data inputs and outputs.
___________________ Interface Models
Figure 3 shows the interface model for the CML inputs,
and Figure 4 shows the model for CML outputs.
V
CC
MAX3840
V
CC
V
CC
50Ω
50Ω
50Ω
DIA0+
DOA0-
DOA0+
V
CC
50Ω
DIA0-
MAX3840
Figure 4. CML Output Model
Figure 3. CML Input Model
_______________________________________________________________________________________
7
✕
+3.3V, 2.7Gbps Dual 2 2 Crosspoint Switch
Pin Configurations
TOP VIEW
TOP VIEW
24 23 22 21 20 19 18 17
ENB1
DIB1+
DIB1-
ENB0
1
2
3
4
5
6
7
8
24 GND
23
V
16
CC
SELA1 25
V
CC
DIA0+ 26
DIA0- 27
SELA0 28
15 DOB1+
14 DOB1-
22 DOA0+
21 DOA0-
V
CC
13
MAX3840
SELB0
DIB0+
DIB0-
SELB1
20
V
CC
MAX3840
ENA0 29
DIA1+ 30
DIA1- 31
ENA1 32
12 DOB0+
11 DOB0-
19 DOA1+
18 DOA1-
V
10
9
CC
17
V
CC
GND
1
2
3
4
5
6
7
8
QFN
THIN QFN
NOTE: THE EXPOSED PAD MUST BE SOLDERED
TO THE SUPPLY GROUND.
NOTE: THE EXPOSED PAD MUST BE SOLDERED
TO THE SUPPLY GROUND.
Package Information
Chip Information
For the latest package outline information, go to
TRANSISTOR COUNT: 1200
PROCESS: Bipolar (SiGe)
www.maxim-ic.com/packages.
PACKAGE TYPE
32 QFN
DOCUMENT NO.
21-0091
32 TQFN
21-0140
Revision History
Rev 1; 11/01: Corrected specification.
Rev 2; 5/03:
Rev 3; 5/05:
Added package code (page 1); updated package drawing (page 10).
Added lead-free package (pages 1, 2, 8, 11, 12).
Rev 4; 12/05: Changed input voltage swing from 1.5V
(max) to 2.0V
(max).
P-P
P-P
Rev 5; 9/07:
Added two AC amplitude specifications to increase test coverage for 2.5Gbps and 2.7GHz
clock inputs (page 3); removed package drawings and added package table (page 8).
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2007 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
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