MAX3640UCM+T [MAXIM]
Cross Point Switch, 1 Func, 8 Channel, PQFP48, 7 X 7 X 1.40 MM, TQFP-48;
| 型号： | MAX3640UCM+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Cross Point Switch, 1 Func, 8 Channel, PQFP48, 7 X 7 X 1.40 MM, TQFP-48 开关 |
| 文件： | 总12页 (文件大小：329K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-4800; Rev 0; 3/00
3.3V, 622Mbps LVDS,
Dual 4:2 Crosspoint Switch
General Description
Features
The MAX3640 is a dual-path crosspoint switch for use
at OC-12 data rates. The MAX3640 can be used to
receive and transmit 622Mbps low-voltage differential
signals (LVDS) across a backplane with minimum jitter
accumulation. Each path incorporates input buffers,
multiplexers, a crosspoint switch, and output drivers.
The four output channels have a redundant set of out-
puts for test or fanning purposes. The device offers sig-
nal-path redundancy for critical data streams.
ꢀ Single +3.3V Supply
ꢀ 257mW Power Consumption (four output
channels enabled)
ꢀ 2.8ps
Output Random Jitter
RMS
ꢀ 42ps Output Deterministic Jitter
ꢀ Power-Down Feature for Deselected Outputs
ꢀ 110ps Channel-to-Channel Skew
ꢀ 240ps Output Edge Speed
The MAX3640 has a unique power-saving feature.
When a set of four output channels has been de-select-
ed, the output drivers are powered down to reduce
power consumption by 165mW. The fully differential
architecture ensures low crosstalk, jitter accumulation,
and signal skew.
ꢀ LVDS Inputs/Outputs
ꢀ LVDS Output 3-State Enable
The MAX3640 is available in a 48-pin TQFP package
and operates from a +3.3V supply over the 0°C to
+85°C temperature range.
Ordering Information
Applications
SONET/SDH Backplanes
High-Speed Parallel Links
Digital Cross-Connects
System Interconnects
ATM Switch Cores
PART
TEMP. RANGE
PIN-PACKAGE
MAX3640UCM
0°C to +85°C
48 TQFP
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
SONET
SOURCE A
MAX3869
MAX3640
CROSSPOINT
SWITCH
LASER DRIVER
MAX3831
4-CHANNEL
INTERCONNECT
MUX/DEMUX
OPTICAL
2.5Gbps
TRANSCEIVER
SONET
SOURCE B
622Mbps
622Mbps
MAX3866
TIA AND LA
MAX3876
CDR
PARALLEL DATA
OUTPUT
________________________________________________________________ Maxim Integrated Products
1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
3.3V, 622Mbps LVDS,
Dual 4:2 Crosspoint Switch
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V ................................................-0.5V to 5.0V
Operating Temperature Range...............................0°C to +85°C
Storage Temperature Range............................ -55°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
CC
Input Voltage (LVDS, TTL)..........................-0.5V to (V
Output Voltage (LVDS)...............................-0.5V to (V
+ 0.5V)
+ 0.5V)
CC
CC
Continuous Power Dissipation (T = +85°C)
A
48-Pin TQFP (derate 12.5mW/°C) .................................813mW
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
CC
unless otherwise noted.)
(V
= +3.0V to 3.6V, LVDS differential load = 100Ω 1ꢀ, T = 0°C to +85°C. Typical values are at V
= +3.3V, T = +25°C,
CC A
A
PARAMETER
SYMBOL
CONDITIONS
Eight outputs enabled
Four outputs enabled
MIN
TYP
130
78
MAX
UNITS
175
Supply Current
I
mA
CC
LVDS INPUTS AND OUTPUTS
Input Voltage Range
V
0
2400
100
mV
mV
mV
Ω
IN
Differential Input Threshold
Threshold Hysteresis
V
IDTH
HYST
-100
V
90
Differential Input Impedance
Input Common-Mode Current
Output Voltage High
R
85
100
245
115
1.475
400
25
IN
I
LVDS input, V = 1.2V
OS
µA
V
OS
V
Figure 1
Figure 1
Figure 1
OH
Output Voltage Low
V
0.925
250
V
OL
Output Voltage Swing
|V
OD
|
mV
Change in Magnitude of
Differential Output for
Complementary States
|∆V
|
mV
mV
mV
OD
Offset Output Voltage
V
Figure 1
1.125
1.275
25
OS
Change in Magnitude of
Output Offset Voltage for
Complementary States
|∆V
|
OS
ENA, ENB = GND
1
MΩ
Ω
Differential Output Impedance
ENA, ENB = V
80
120
12
CC
Output Current
Shorted together
mA
TTL INPUTS
Input Voltage High
Input Voltage Low
Input Current High
Input Current Low
V
2.0
V
V
IH
V
0.8
IL
I
V
V
= 2.0V
= 0.8V
-250
-550
µA
µA
IH
IH
IL
I
IL
2
_______________________________________________________________________________________
3.3V, 622Mbps LVDS,
Dual 4:2 Crosspoint Switch
AC ELECTRICAL CHARACTERISTICS
CC
unless otherwise noted.) (Note 1)
(V
= +3.0V to 3.6V, LVDS differential load = 100Ω 1ꢀ, T = 0°C to +85°C. Typical values are at V
= +3.3V, T = +25°C,
CC A
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
622
240
2.8
42
MAX
UNITS
Mbps
ps
Parallel Input/Output Data Rate
Output Rise/Fall Time
t , t
r
20ꢀ to 80ꢀ
(Note 2)
150
350
4
f
Output Random Jitter
RJ
DJ
ps
RMS
Output Deterministic Jitter
LVDS Output Differential Skew
200
50
ps
ps
t
t
24
SKEW1
LVDS Output Channel-to-
Channel Skew
110
ps
SKEW2
LVDS Output Enable Time
LVDS Output Disable Time
266
66
ns
ns
LVDS Propagation Delay from
Input to Output
t
2.5
ns
D
Note 1: AC characteristics are guaranteed by design and characterization.
Note 2: Deterministic jitter (DJ) is the arithmetic sum of pattern-dependent jitter and pulse-width distortion. DJ is measured while
applying 100mVp-p noise (f ≤ 2MHz) to the power supply.
V
OH
125mV MIN
200mV MAX
250mV MIN
400mV MAX
LVDS+
SINGLE ENDED
V
= 1.2V ±±5mV
OS
V
OL
V
OH
250mV MIN
400mV MAX
V
OS
= 1.2V ±±5mV
125mV MIN
200mV MAX
LVDS-
SINGLE ENDED
V
OL
V
OD
250mV MIN
400mV MAX
500mV MIN
800mV MAX
0
(LVDS+) - (LVDS-)
DIFFERENTIAL OUTPUT
VOLTAGE
Figure 1. LVDS Output Levels
_______________________________________________________________________________________
3
3.3V, 622Mbps LVDS,
Dual 4:2 Crosspoint Switch
Typical Operating Characteristics
(V
= +3.3V, T = +25°C, unless otherwise noted.)
CC
A
DIFFERENTIAL OUTPUT VOLTAGE
SUPPLY CURRENT vs. TEMPERATURE
vs. TEMPERATURE
150
640
140
130
630
620
610
600
590
580
570
560
8 OUTPUTS ENABLED
4 OUTPUTS ENABLED
120
110
100
90
80
±0
60
50
0
10 20 30 40 50 60 ±0 80
TEMPERATURE (°C)
0
20
40
60
80
TEMPERATURE (°C)
622Mbps EYE DIAGRAM
1.25Gbps EYE DIAGRAM
13
13
INPUT = 2 - 1 PRBS
INPUT = 2 - 1 PRBS
CONTAINS 100 ZEROS
CONTAINS 100 ZEROS
100mV/div
100mV/div
200ps/div
100ps/div
4
_______________________________________________________________________________________
3.3V, 622Mbps LVDS,
Dual 4:2 Crosspoint Switch
Pin Description
PIN
NAME
FUNCTION
1, 12, 25, 36,
41
V
Positive Supply Voltage
CC
2, 11, 26, 35
3, 5, 45, 47
GND
Supply Ground
DIA3+, DIA4+, DIA1+,
DIA2+
Positive LVDS, Channel-A Data Input
DIA3-, DIA4-, DIA1-,
DIA2-
4, 6, 46, 48
7, 9, 13, 15
Negative LVDS, Channel-A Data Input
Positive LVDS, Channel-B Data Input
DIB1+, DIB2+, DIB3+,
DIB4+
DIB1-, DIB2-, DIB3-,
DIB4-
8, 10, 14, 16
17–20
Negative LVDS, Channel-B Data Input
Crosspoint Switch Select, TTL Input. (Table 1)
Negative LVDS, Channel-B Data Output
SEL1–SEL4
DOB4-, DOB3-, DOB2-,
DOB1-
21, 23, 27, 29
DOB4+, DOB3+,
DOB2+, DOB1+
22, 24, 28, 30
Positive LVDS, Channel-B Data Output
Negative LVDS, Channel-A Data Output
Positive LVDS, Channel-A Data Output
DOA4-, DOA3-, DOA2-,
DOA1-
31, 33, 37, 39
DOA4+, DOA3+,
DOA2+, DOA1+
32, 34, 38, 40
Channel-B Output Enable, TTL Input. ENB = high enables DOB1−DOB4.
ENB = low powers down DOB1−DOB4 and sets them to a high-impedance state.
42
43
44
ENB
ENA
Channel-A Output Enable, TTL Input. ENA = high enables DOA1−DOA4.
ENA = low powers down DOA1−DOA4 and sets them to a high-impedance state.
Input Select Pin, TTL Input. Connect to logic high (or V ) to select DIA1−DIA4.
CC
IN_SEL
Connect to logic low (or GND) to select DIB1−DIB4.
LVDS Inputs and Outputs
Detailed Description
The MAX3640 features LVDS inputs and outputs for
interfacing with high-speed digital circuitry. The LVDS
standard is based on the IEEE 1596.3 LVDS specifica-
tion. This technology uses 500mV to 800mV differential
low-voltage swings to achieve fast transition times, low
power dissipation, and improved noise immunity.
Figure 2 shows the MAX3640’s architecture. It consists
of two data paths; each data path begins with four dif-
ferential input buffers. The IN_SEL pin selects whether
the A or B channels are passed to the 2x2 crosspoint
switch that follows. The SEL_ pins control the routing of
the crosspoint switch. Each crosspoint switch output
drives a pair of LVDS output drivers. This provides a
redundant set of outputs that can be used for fan-out
or test purposes. Each set of outputs, DOA_ and
DOB_, is enabled or disabled by the ENA and ENB
pins. See Table 1 for routing controls.
For proper operation, the data outputs require 100Ω dif-
ferential termination between the inverting and nonin-
verting pins. Do not terminate these outputs to ground.
See Figure 1 for LVDS output voltage specifications.
The data inputs are internally terminated with 100Ω dif-
ferential and therefore do not require external termina-
tion.
_______________________________________________________________________________________
5
3.3V, 622Mbps LVDS,
Dual 4:2 Crosspoint Switch
2x2 CROSSPOINT
SWITCH
MAX3640
DIA1+
DOA1+
DOA1-
1
0
DIA1-
DIB1+
DOB1+
1
0
DIB1-
DIA2+
DOB1-
SEL1
DOA2+
DOA2-
1
0
DIA2-
DIB2+
DOB2+
DOB2-
SEL2
1
0
DIB2-
2x2 CROSSPOINT
SWITCH
DIA3+
DIA3-
DOA3+
DOA3-
1
0
0
1
DIB3+
DIB3-
DOB3+
DOB3-
SEL3
DIA4+
DIA4-
DOA4+
DOA4-
1
0
0
1
DIB4+
DIB4-
DOB4+
DOB4-
SEL4
IN_SEL
ENA
ENB
Figure 2. Functional Diagram
6
_______________________________________________________________________________________
3.3V, 622Mbps LVDS,
Dual 4:2 Crosspoint Switch
Table 1. Output Routing
ROUTING CONTROLS
OUTPUT SIGNALS
IN_SEL
SEL1
SEL2
Signal at DOA1/DOB1
Signal at DOA2/DOB2
0
0
0
0
1
DIB1
DIB1
0
DIB1
DIB2
0
1
0
DIB2
DIB1
0
1
1
DIB2
DIB2
1
0
0
DIA1
DIA1
1
0
1
DIA1
DIA2
1
1
0
DIA2
DIA1
1
1
1
DIA2
DIA2
IN_SEL
SEL3
0
SEL4
0
Signal at DOA3/DOB3
Signal at DOA4/DOB4
0
0
0
0
1
1
1
DIB3
DIB3
DIB4
DIB4
DIA3
DIA3
DIA4
DIB3
DIB4
DIB3
DIB4
DIA3
DIA4
DIA3
0
1
1
0
1
1
0
0
0
1
1
0
1
1
1
DIA4
DIA4
Note: Disabling the outputs by using ENA or ENB will drive the DOA_ or DOB_ data outputs to a high-impedance state.
+3.3V
182Ω
48Ω
48Ω
Z = 50Ω
o
LVPECL
DRIVER
MAX3640
Z = 50Ω
o
48Ω
182Ω
48Ω
+3.3V
Figure 3. LVPECL to LVDS Interface
_______________________________________________________________________________________
7
3.3V, 622Mbps LVDS,
Dual 4:2 Crosspoint Switch
Layout Techniques
Applications Information
For best performance, use good high-frequency layout
techniques. Filter voltage supplies, and keep ground
connections short. Use multiple vias where possible.
Also, use controlled-impedance transmission lines to
interface with the MAX3640 data inputs and outputs.
Interfacing LVPECL Outputs to
MAX3640 LVDS Inputs
To DC-couple between LVPECL and LVDS, use the
resistor network shown in Figure 3. Note that the
LVPECL output is optimized for a 50Ω load to V
- 2V,
CC
Interface Models
Figure 4 shows the interface model for the LVDS
inputs, while Figure 5 shows the model for the LVDS
outputs.
so an equivalent network is used. Also, the network
attenuation should be such that the LVPECL output sig-
nal after attenuation is well within the LVDS input range.
Note that the LVDS input impedance is a true 100Ω
between the inputs. The differential impedance does
not contribute to the DC termination impedance, but
does contribute to the AC termination impedance. This
means that AC and DC impedance will always be dif-
ferent.
V
CC
V
25k
CC
MAX3640
1.5k
DIA1+
5k
50Ω
50Ω
V
CC
DIA1-
1.5k
Figure 4. LVDS Input Model
8
_______________________________________________________________________________________
3.3V, 622Mbps LVDS,
Dual 4:2 Crosspoint Switch
Chip Information
V
CC
TRANSISTOR COUNT: 2453
V
CC
DOA1+
DOA1-
45Ω
45Ω
V
CC
MAX3640
Figure 5. LVDS Output Model
Pin Configuration
V
V
1
2
36
35
34
33
32
31
30
29
28
27
26
25
CC
CC
GND
GND
DIA3+
DIA3-
DIA4+
DIA4-
DIB1+
DIB1-
DIB2+
DIB2-
GND
DOA3+
DOA3-
DOA4+
DOA4-
DOB1+
DOB1-
DOB2+
DOB2-
GND
3
4
5
6
MAX3640
7
8
9
10
11
12
V
V
CC
CC
_______________________________________________________________________________________
9
3.3V, 622Mbps LVDS,
Dual 4:2 Crosspoint Switch
Package Information
10 ______________________________________________________________________________________
3.3V, 622Mbps LVDS,
Dual 4:2 Crosspoint Switch
NOTES
______________________________________________________________________________________ 11
3.3V, 622Mbps LVDS,
Dual 4:2 Crosspoint Switch
NOTES
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.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2000 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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