DS25CP104ATSQ [NSC]
3.125 Gbps 4x4 LVDS Crosspoint Switch with Transmit Pre-Emphasis and Receive Equalization; 3.125 Gbps的LVDS 4×4交叉点开关与发送预加重和接收均衡型号: | DS25CP104ATSQ |
厂家: | National Semiconductor |
描述: | 3.125 Gbps 4x4 LVDS Crosspoint Switch with Transmit Pre-Emphasis and Receive Equalization |
文件: | 总28页 (文件大小:568K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
May 13, 2009
DS25CP104A / DS25CP114
3.125 Gbps 4x4 LVDS Crosspoint Switch with Transmit
Pre-Emphasis and Receive Equalization
General Description
Features
The DS25CP104A and DS25CP114 are 3.125 Gbps 4x4
LVDS crosspoint switches optimized for high-speed signal
routing and switching over lossy FR-4 printed circuit board
backplanes and balanced cables. Fully differential signal
paths ensure exceptional signal integrity and noise immunity.
The non-blocking architecture allows connections of any input
to any output or outputs. The switch configuration can be ac-
complished via external pins or the System Management Bus
(SMBus) interface.
DC - 3.125 Gbps low jitter, low skew, low power operation
■
■
Pin and SMBus configurable, fully differential, non-
blocking architecture
Pin (two levels) and SMBus (four levels) selectable pre-
emphasis and equalization eliminate ISI jitter
■
Wide Input Common Mode Range enables easy interface
to CML and LVPECL drivers
■
LOS circuitry detects open inputs fault condition
■
On-chip 100Ω input and output termination minimizes
insertion and return losses, reduces component count and
minimizes board space. The DS25CP114 eliminates the
on-chip input termination for added design flexibility.
8 kV ESD on LVDS I/O pins protects adjoining
components
■
The DS25CP104A and DS25CP114 feature four levels (Off,
Low, Medium, High) of transmit pre-emphasis (PE) and four
levels (Off, Low, Medium, High) of receive equalization (EQ)
settable via the SMBus interface. Off and Medium PE levels
and Off and Low EQ levels are settable with the external pins.
In addition, the SMBus circuitry enables the loss of signal
(LOS) monitors that can inform a system of the presence of
an open inputs condition (e.g. disconnected cable).
■
■
Small 6 mm x 6 mm LLP-40 space saving package
Applications
Wide input common mode range allows the switch to accept
signals with LVDS, CML and LVPECL levels; the output levels
are LVDS. A very small package footprint requires a minimal
space on the board while the flow-through pinout allows easy
board layout. On the DS25CP104A each differential input and
output is internally terminated with a 100Ω resistor to lower
return losses, reduce component count and further minimize
board space. For added design flexibility the 100Ω input ter-
minations on the DS25CP114 have been eliminated. This
enables a designer to build custom crosspoint configurations
and distribution circuits that require a limited multidrop sig-
naling topology.
SD/HD/3G HD SDI Routers
■
■
OC-48 / STM-16
InfiniBand and FireWire
■
Typical Application
30073603
© 2009 National Semiconductor Corporation
300736
www.national.com
Device Information
Device
Function
Termination Option
Available Signal
Conditioning
DS25CP104A
DS25CP114
4x4 Crosspoint Switch
4x4 Crosspoint Switch
4 Levels: PE and EQ
4 Levels : PE and EQ
Internal 100Ω for LVDS inputs
None: Requires external
termination
Ordering Information
NSID
Package
Tape & Reel QTY
Package Number
SQA40A
DS25CP104ATSQ
DS25CP104ATSQX
DS25CP114TSQ
DS25CP114TSQX
40 Lead LLP Package
40 Lead LLP Package
40 Lead LLP Package
40 Lead LLP Package
250
2500
250
SQA40A
SQA40A
2500
SQA40A
Block Diagrams
30073601
DS25CP104A
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2
30073611
DS25CP114
3
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Connection Diagram
30073602
DS25CP104A / DS25CP114 Pin Diagram
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4
Pin Descriptions
Pin
Number
Pin Name
I/O, Type
Pin Description
IN0+, IN0- ,
IN1+, IN1-,
IN2+, IN2-,
IN3+, IN3-
1, 2,
4, 5,
6, 7,
9, 10
I, LVDS
Inverting and non-inverting high speed LVDS input pins. These 4
input pairs have a 100 Ohm differential input termination on the
CP104A device. The CP114 eliminates the input termination for
added design flexibility.
OUT0+, OUT0-,
OUT1+, OUT1-,
OUT2+, OUT2-,
OUT3+, OUT3-
29, 28,
27, 26,
24, 23,
22, 21
O, LVDS
Inverting and non-inverting high speed LVDS output pins. Each
output pair has an internal 100 Ohm termination to improve device
return loss characteristics.
EQ0, EQ1,
EQ2, EQ3
40, 39,
11, 12
I, LVCMOS
I, LVCMOS
I, LVCMOS
Receive equalization level select pins. These pins are functional
regardless of the EN_smb pin state.
PE0, PE1,
PE2, PE3
31, 20,
19, 18
Transmit pre-emphasis level select pins. These pins are functional
regardless of the EN_smb pin state.
EN_smb
17
System Management Bus (SMBus) enable pin. The pin has an
internal pull down. When the pin is set to a [1], the device is in the
SMBus mode. All SMBus registers are reset when this pin is
toggled. There is a 20k pulldown device on this pin.
S00/SCL
S01/SDA
37
36
I, LVCMOS
For EN_smb = [0], these pins select which LVDS input is routed
to the OUT0.
I/O, LVCMOS
In the SMBus mode, when the EN_smb = [1], these pins are
SMBus clock input and data input pins respectively.
S10/ADDR0,
S11/ADDR1
35,
34
I, LVCMOS
I, LVCMOS
I, LVCMOS
I, LVCMOS
For EN_smb = [0], these pins select which LVDS input is routed
to the OUT1.
In the SMBus mode, when the EN_smb = [1], these pins are the
User-Set SMBus Slave Address inputs.
S20/ADDR2,
S21/ADDR3
33,
32
For EN_smb = [0], these pins select which LVDS input is routed
to the OUT2.
In the SMBus mode, when the EN_smb = H, these pins are the
User-Set SMBus Slave Address inputs.
S30, S31
PWDN
13, 14
38
For EN_smb = [0], these pins select which LVDS input is routed
to the OUT3.
In the SMBus mode, when the EN_smb = [1], these pins are non-
functional and should be tied to either logic H or L.
For EN_smb = [0], this is the power down pin. When the PWDN is
set to a [0], the device is in the power down mode. The SMBus
circuitry can still be accessed provided the EN_smb pin is set to a
[1].
In the SMBus mode, the device is powered up by either setting the
PWDN pin to [1] OR by writing a [1] to the Control Register D[7]
bit ( SoftPWDN). The device will be powered down by setting the
PWDN pin to [0] AND by writing a [0] to the Control Register D[7]
bit ( SoftPWDN).
VDD
GND
3, 8,
15,25, 30
Power
Power supply pins.
16, DAP Power
Ground pin and a pad (DAP - die attach pad).
Note: Center DAP connection must be made to GND for optimum electrical and thermal performance.
5
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Absolute Maximum Ratings (Note 4)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Package Thermal Resistance
ꢀθJA
+26.9°C/W
+3.8°C/W
ꢀθJC
ESD Susceptibility
HBM (Note 1)
Supply Voltage
−0.3V to +4V
−0.3V to (VCC + 0.3V)
−0.3V to (VCC + 0.3V)
−0.3V to +4V
LVCMOS Input Voltage
LVCMOS Output Voltage
LVDS Input Voltage
LVDS Differential Input Voltage
(DS25CP104A)
LVDS Differential Input Voltage
(DS25CP114)
LVDS Output Voltage
≥8 kV
≥250V
≥1250V
MM (Note 2)
CDM (Note 3)
Note 1: Human Body Model, applicable std. JESD22-A114C
Note 2: Machine Model, applicable std. JESD22-A115-A
1.0V
Note 3: Field Induced Charge Device Model, applicable std.
JESD22-C101-C
VCC + 0.6V
−0.3V to (VCC + 0.3V)
0V to 1.0V
LVDS Differential Output Voltage
LVDS Output Short Circuit Current
Duration
Junction Temperature
Storage Temperature Range
Lead Temperature Range
Soldering (4 sec.)
Recommended Operating
Conditions
5 ms
+150°C
−65°C to +150°C
Min
3.0
0
Typ
3.3
Max Units
Supply Voltage (VCC
)
3.6
1
V
V
Receiver Differential Input
Voltage (VID)
+260°C
(DS25CP104A only)
Operating Free Air
Temperature (TA)
Maximum Package Power Dissipation at 25°C
SQA Package
−40
+25
+85
3.6
°C
V
4.65W
Derate SQA Package
37.2 mW/°C above +25°C
SMBus (SDA, SCL)
DC Electrical Characteristics
Over recommended operating supply and temperature ranges unless otherwise specified. (Notes 5, 6, 8)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
LVCMOS DC SPECIFICATIONS
VIH
VIL
IIH
High Level Input Voltage
Low Level Input Voltage
High Level Input Current
2.0
VCC
0.8
V
GND
V
VIN = 3.6V
VCC = 3.6V
0
175
0
±10
250
±10
μA
μA
μA
EN_smb pin
40
IIL
Low Level Input Current
VIN = GND
VCC = 3.6V
VCL
VOL
Input Clamp Voltage
ICL = −18 mA, VCC = 0V
IOL= 4 mA SDA pin
−0.9
−1.5
0.4
V
V
Low Level Output Voltage
LVDS INPUT DC SPECIFICATIONS
VID
VTH
VTL
Input Differential Voltage(Note 9)
Differential Input High Threshold
Differential Input Low Threshold
0
1
V
VCM = +0.05V or VCC-0.05V
VID = 100 mV
0
0
+100
mV
mV
−100
0.05
VCC
-
VCMR
IIN
Input Common Mode Voltage Range
Input Current(Note 7)
V
0.05
VIN = +3.6V or 0V
VCC = 3.6V or 0V
±1
±10
μA
CIN
RIN
Input Capacitance
Any LVDS Input Pin to GND
Between IN+ and IN-
1.7
pF
100
Input Termination Resistor(Note 10)
Ω
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6
Symbol
Parameter
Conditions
Min
Typ
Max
Units
LVDS OUTPUT DC SPECIFICATIONS
VOD
Differential Output Voltage
250
-35
350
450
35
mV
mV
V
RL = 100Ω
RL = 100Ω
Change in Magnitude of VOD for Complimentary
Output States
ΔVOD
VOS
Offset Voltage
1.05
-35
1.2
1.375
35
Change in Magnitude of VOS for Complimentary
Output States
ΔVOS
mV
OUT to GND
-35
7
-55
55
mA
mA
pF
Ω
IOS
Output Short Circuit Current (Note 11)
OUT to VCC
COUT
ROUT
Output Capacitance
Any LVDS Output Pin to GND
Between OUT+ and OUT-
1.2
100
Output Termination Resistor
SUPPLY CURRENT
ICC1 Supply Current
ICC2
PWDN = 0
40
50
mA
mA
Supply Current
PWDN = 1
145
175
PE = Off, EQ = Off
Broadcast (1:4) Mode
ICC3
Supply Current
PWDN = 1
157
190
mA
PE = Off, EQ = Off
Quad Buffer (4:4) Mode
Note 4: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur, including inoperability and degradation of device reliability
and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or other conditions beyond those indicated in
the Recommended Operating Conditions is not implied. The Recommended Operating Conditions indicate conditions at which the device is functional and the
device should not be operated beyond such conditions.
Note 5: The Electrical Characteristics tables list guaranteed specifications under the listed Recommended Operating Conditions except as otherwise modified
or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and are not guaranteed.
Note 6: Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground except VOD and
ΔVOD
.
Note 7: IIN is applied to both pins of the LVDS input pair at the same time.
Note 8: Typical values represent most likely parametric norms for VCC = +3.3V and TA = +25°C, and at the Recommended Operation Conditions at the time of
product characterization and are not guaranteed.
Note 9: Input Differential Voltage (VID) The DS25CP104A limits input amplitude to 1 volt. The DS25CP114 supports any VID within the supply voltage to GND
range.
Note 10: Input Termination Resistor (RIN) The DS25CP104A provides an integrated 100 ohm input termination for each high speed LVDS pair. The DS25CP114
eliminates this internal termination.
Note 11: Output short circuit current (IOS) is specified as magnitude only, minus sign indicates direction only.
7
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AC Electrical Characteristics
Over recommended operating supply and temperature ranges unless otherwise specified. (Notes 12, 13)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
LVDS OUTPUT AC SPECIFICATIONS (Note 14)
tPLHD
tPHLD
Differential Propagation Delay Low to
High
480
460
650
650
ps
ps
RL = 100Ω
Differential Propagation Delay High to
Low
tSKD1
tSKD2
tSKD3
tLHT
Pulse Skew |tPLHD − tPHLD| , (Note 15)
Channel to Channel Skew , (Note 16)
Part to Part Skew , (Note 17)
Rise Time
20
40
50
80
80
6
100
125
200
150
150
20
ps
ps
ps
ps
ps
RL = 100Ω
tHLT
Fall Time
tON
Power Up Time
Time from PWDN =LH to OUTn active
Time from PWDN =HL to OUTn inactive
μs
ns
ns
tOFF
tSEL
Power Down Time
8
25
Select Time
Time from Sn =LH or HL to new signal
at OUTn
8
12
JITTER PERFORMANCE WITH EQ = Off, PE = Off (Note 14)(Figure 5)
tRJ1
tRJ2
VID = 350 mV
VCM = 1.2V
1.25 GHz
0.5
0.5
1.1
1.1
ps
ps
Random Jitter (RMS Value)
No Test Channels
(Note 18)
1.5625 GHz
2.5 Gbps
Clock (RZ)
tDJ1
tDJ2
VID = 350 mV
VCM = 1.2V
10
22
ps
Deterministic Jitter (Peak to Peak)
No Test Channels
(Note 19)
3.125 Gbps
2.5 Gbps
10
27
ps
K28.5 (NRZ)
VID = 350 mV
VCM = 1.2V
tTJ1
tTJ2
UIP-P
UIP-P
0.07
0.13
0.11
0.16
Total Jitter (Peak to Peak)
No Test Channels
(Note 20)
3.125 Gbps
PRBS-23 (NRZ)
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8
Symbol
Parameter
Conditions
Min
Typ
Max
Units
JITTER PERFORMANCE WITH EQ = Off, PE = Low(Note 14) (Figure 6 Figure 9)
tRJ1A
tRJ2A
VID = 350 mV
VCM = 1.2V
Clock (RZ)
1.25 GHz
0.5
0.5
10
1.1
1.1
22
ps
ps
ps
ps
Random Jitter (RMS Value)
Test Channels A
(Note 18)
1.5625 GHz
2.5 Gbps
tDJ1A
tDJ2A
VID = 350 mV
VCM = 1.2V
K28.5 (NRZ)
Deterministic Jitter (Peak to Peak)
Test Channels A
(Note 19)
3.125 Gbps
10
27
JITTER PERFORMANCE WITH EQ = Off, PE = Medium (Note 14) (Figure 6 Figure 9)
tRJ1B
tRJ2B
VID = 350 mV
VCM = 1.2V
1.25 GHz
0.5
0.5
1.1
1.1
ps
ps
Random Jitter (RMS Value)
Test Channels B
(Note 18)
1.5625 GHz
2.5 Gbps
Clock (RZ)
tDJ1B
tDJ2B
VID = 350 mV
VCM = 1.2V
12
30
ps
Deterministic Jitter (Peak to Peak)
Test Channels B
(Note 19)
3.125 Gbps
2.5 Gbps
12
30
ps
K28.5 (NRZ)
VID = 350 mV
VCM = 1.2V
tTJ1B
tTJ2B
UIP-P
UIP-P
0.08
0.10
0.10
0.15
Total Jitter (Peak to Peak)
Test Channels B
(Note 20)
3.125 Gbps
PRBS-23 (NRZ)
JITTER PERFORMANCE WITH EQ = Off, PE = High (Note 14) (Figures 6, 9)
tRJ1C
tRJ2C
VID = 350 mV
VCM = 1.2V
Clock (RZ)
1.25 GHz
0.5
0.5
30
1.1
1.1
60
ps
ps
ps
ps
Random Jitter (RMS Value)
Test Channels C
(Note 18)
1.5625 GHz
2.5 Gbps
tDJ1C
tDJ2C
VID = 350 mV
VCM = 1.2V
K28.5 (NRZ)
Deterministic Jitter (Peak to Peak)
Test Channels C
(Note 19)
3.125 Gbps
30
65
9
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Symbol
Parameter
Conditions
Min
Typ
Max
Units
JITTER PERFORMANCE WITH PE = Off, EQ = Low (Note 14) (Figure 7 Figure 9)
tRJ1D
tRJ2D
VID = 350 mV
VCM = 1.2V
1.25 GHz
0.5
0.5
1.1
1.1
ps
ps
Random Jitter (RMS Value)
Test Channels D
(Note 18)
1.5625 GHz
2.5 Gbps
Clock (RZ)
tDJ1D
tDJ2D
VID = 350 mV
VCM = 1.2V
20
40
ps
Deterministic Jitter (Peak to Peak)
Test Channels D
(Note 19)
3.125 Gbps
2.5 Gbps
20
40
ps
K28.5 (NRZ)
VID = 350 mV
VCM = 1.2V
tTJ1D
tTJ2D
UIP-P
UIP-P
0.08
0.09
0.15
0.20
Total Jitter (Peak to Peak)
Test Channels D
(Note 20)
3.125 Gbps
PRBS-23 (NRZ)
JITTER PERFORMANCE WITH PE = Off, EQ = Medium (Note 14) (Figures 7, 9)
tRJ1E
tRJ2E
VID = 350 mV
VCM = 1.2V
Clock (RZ)
1.25 GHz
1.5625 GHz
2.5 Gbps
0.5
0.5
35
1.1
1.1
60
ps
ps
ps
Random Jitter (RMS Value)
Test Channels E
(Note 18)
tDJ1E
tDJ2E
Residual Deterministic Jitter (Peak to
Peak)
Test Channels E
(Note 19)
VID = 350 mV
VCM = 1.2V
K28.5 (NRZ)
3.125 Gbps
28
55
ps
JITTER PERFORMANCE WITH PE = Off, EQ = High (Note 14) (Figures 7, 9)
tRJ1F
tRJ2F
VID = 350 mV
VCM = 1.2V
Clock (RZ)
1.25 GHz
1.5625 GHz
2.5 Gbps
1.3
1.4
30
1.8
2.4
75
ps
ps
ps
Random Jitter (RMS Value)
Test Channels F
(Note 18)
tDJ1F
tDJ2F
Residual Deterministic Jitter (Peak to
Peak)
Test Channels F
(Note 19)
VID = 350 mV
VCM = 1.2V
K28.5 (NRZ)
3.125 Gbps
35
90
ps
JITTER PERFORMANCE WITH PE = Medium, EQ = Low (Note 14) (Figures 7, 9)
tRJ1G
tRJ2G
Random Jitter (RMS Value)
Input Test Channels D
Output Test Channels B
(Note 18)
VID = 350 mV
VCM = 1.2V
Clock (RZ)
1.25 GHz
0.5
0.5
25
1.1
1.1
ps
ps
ps
ps
1.5625 GHz
2.5 Gbps
tDJ1G
tDJ2G
Deterministic Jitter (Peak to Peak)
Input Test Channels D
Output Test Channels B
(Note 19)
VID = 350 mV
VCM = 1.2V
3.125 Gbps
20
K28.5 (NRZ)
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10
Symbol
Parameter
Conditions
Min
Typ
Max
Units
SMBus AC SPECIFICATIONS
fSMB
tBUF
SMBus Operating Frequency
10
100
kHz
Bus free time between Stop and Start
Conditions
4.7
μs
tHD:SDA
Hold time after (Repeated) Start
Condition. After this period, the first clock
is generated.
4.0
μs
tSU:SDA
tSU:SDO
tHD:DAT
tSU:DAT
tTIMEOUT
tLOW
Repeated Start Condition setup time.
Stop Condition setup time
Data hold time
4.7
4.0
300
250
25
μs
μs
ns
ns
ms
μs
μs
Data setup time
Detect clock low timeout
Clock low period
35
4.7
4.0
tHIGH
Clock high period
50
tPOR
Time in which a device must be
operational after power-on reset
500
ms
Note 12: The Electrical Characteristics tables list guaranteed specifications under the listed Recommended Operating Conditions except as otherwise modified
or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and are not guaranteed.
Note 13: Typical values represent most likely parametric norms for VCC = +3.3V and TA = +25°C, and at the Recommended Operation Conditions at the time of
product characterization and are not guaranteed.
Note 14: Specification is guaranteed by characterization and is not tested in production.
Note 15: tSKD1, |tPLHD − tPHLD|, Pulse Skew, is the magnitude difference in differential propagation delay time between the positive going edge and the negative
going edge of the same channel.
Note 16: tSKD2, Channel to Channel Skew, is the difference in propagation delay (tPLHD or tPHLD) among all output channels in Broadcast mode (any one input to
all outputs).
Note 17: tSKD3, Part to Part Skew, is defined as the difference between the same signal path of any two devices running at the same VCC and within 5°C of each
other within the operating temperature range.
Note 18: Measured on a clock edge with a histogram and an acummulation of 1500 histogram hits. Input stimulus jitter is subtracted geometrically.
Note 19: Tested with a combination of the 1100000101 (K28.5+ character) and 0011111010 (K28.5- character) patterns. Input stimulus jitter is subtracted
algebraically.
Note 20: Measured on an eye diagram with a histogram and an acummulation of 3500 histogram hits. Input stimulus jitter is subtracted.
11
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DC Test Circuits
30073620
FIGURE 1. Differential Driver DC Test Circuit
AC Test Circuits and Timing Diagrams
30073621
FIGURE 2. Differential Driver AC Test Circuit
Note: DS25CP114 requires external 100Ω input termination.
30073622
FIGURE 3. Propagation Delay Timing Diagram
30073623
FIGURE 4. LVDS Output Transition Times
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Pre-Emphasis and Equalization Test Circuits
30073629
FIGURE 5. Jitter Performance Test Circuit
Note: DS25CP114 requires external 100Ω input termination.
30073627
FIGURE 6. Pre-Emphasis Performance Test Circuit
Note: DS25CP114 requires external 100Ω input termination.
30073626
FIGURE 7. Equalization Performance Test Circuit
Note: DS25CP114 requires external 100Ω input termination.
13
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30073630
FIGURE 8. Pre-Emphasis and Equalization Performance Test Circuit
Note: DS25CP114 requires external 100Ω input termination.
30073628
FIGURE 9. Test Channel Block Diagram
Test Channel Loss Characteristics
The test channel was fabricated with Polyclad PCL-FR-370-Laminate/PCL-FRP-370 Prepreg materials (Dielectric constant of 3.7
and Loss Tangent of 0.02). The edge coupled differential striplines have the following geometries: Trace Width (W) = 5 mils, Gap
(S) = 5 mils, Height (B) = 16 mils.
Test Channel
Length
(inches)
Insertion Loss (dB)
1000 MHz 1250 MHz
-2.0 -2.4
500 MHz
-1.2
750 MHz
-1.7
1500 MHz
-2.7
1560 MHz
-2.8
A
B
C
D
E
F
10
20
30
15
30
60
-2.6
-3.5
-4.1
-7.0
-2.7
-5.6
-12.4
-4.8
-8.2
-3.2
-6.6
-14.5
-5.5
-5.6
-4.3
-5.7
-9.4
-9.7
-1.6
-2.2
-3.7
-3.8
-3.4
-4.5
-7.7
-7.9
-7.8
-10.3
-16.6
-17.0
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14
S10, S11, S21 and S21 pins become the User-Set SMBus
Slave Address input pins (ADDR0, 1, 2 and 3) while the S30
and S31 pins become non-functional (tieing these two pins to
either H or L is recommended if the device will function only
in the SMBus mode).
Functional Description
The DS25CP104A and DS25CP114 are 3.125 Gbps 4x4
LVDS digital crosspoint switch optimized for high-speed sig-
nal routing and switching over lossy FR-4 printed circuit board
backplanes and balanced cables. The DS25CP104A and
DS25CP114 operate in two modes: Pin Mode
(EN_smb = 0) and SMBus Mode (EN_smb = 1).
In the SMBus Mode, the PE and EQ select pins as well as the
PWDN pin remain functional. How these pins function in each
mode is explained in the following sections.
When in the Pin Mode, the switch is fully configurable with
external pins. This is possible with two input select pins per
output (e.g. S00 and S01 pins for OUT0). There is also one
transmit pre-emphasis (PE) level select pin per output for
switching the PE levels between Medium and Off settings and
one receive equalization (EQ) level select pin per input for
switching the EQ levels between Low and Off settings.
OPERATION IN PIN MODE
Power Up
In the Pin Mode, when the power is applied to the device
power suppy pins, the DS25CP104A/DS25CP114 enters the
Power Up mode when the PWDN pin is set to logic H. When
in the Power Down mode (PWDN pin is set to logic L), all
circuitry is shut down except the minimum required circuitry
for the LOS and SMBus Slave operation.
In the Pin Mode, feedback from the LOS (Loss Of Signal)
monitor circuitry is not available (there is not an LOS output
pin).
When in the SMBus Mode, the full switch configuration, four
levels of transmit pre-emphasis (Off, Low, Medium and High),
four levels of receive equalization (Off, Low, Medium and
High) and SoftPWDN can be programmed via the SMBus in-
terface. In addition, by using the SMBus interface, a user can
obtain the feedback from the built-in LOS circuitry which de-
tects an open inputs fault condition.
Switch Configuration
In the Pin Mode, the DS25CP104A/DS25CP114 operates as
a fully pin-configurable crosspoint switch. The following truth
tables illustrate how the swich can be configured with external
pins.
In the SMBus Mode, the S00 and S01 pins become SMBus
clock (SCL) input and data (SDA) input pins respectively; the
Switch Configuration Truth Tables
TABLE 1. Input Select Pins Configuration for the Output OUT0
S01
0
S00
0
INPUT SELECTED
IN0
IN1
IN2
IN3
0
1
1
0
1
1
TABLE 2. Input Select Pins Configuration for the Output OUT1
S11
0
S10
0
INPUT SELECTED
IN0
IN1
IN2
IN3
0
1
1
0
1
1
15
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TABLE 3. Input Select Pins Configuration for the Output OUT2
S21
0
S20
0
INPUT SELECTED
IN0
IN1
IN2
IN3
0
1
1
0
1
1
TABLE 4. Input Select Pins Configuration for the Output OUT3
S31
0
S30
0
INPUT SELECTED
IN0
IN1
IN2
IN3
0
1
1
0
1
1
Setting Pre-Emphasis Levels
Medium or Off level. The following is the transmit pre-empha-
sis truth table.
The DS25CP104A/DS25CP114 has one PE level select pin
per output for setting the transmit pre-emphasis to either
TABLE 5. Transmit Pre-Emphasis Truth Table
OUTPUT OUTn, n = {0, 1, 2, 3}
Pre-Emphasis Control Pin (PEn) State
Pre-Emphasis Level
0
1
Off
Medium
Transmit Pre-emphasis Level Selection for an Output OUTn
Setting Equalization Levels
The DS25CP104A/DS25CP114 has one EQ level select pin
per input for setting the receive equalization to either Low or
Off level. The following is the receive equalization truth table.
TABLE 6. Receive Equalization Truth Table
INPUT INn, n = {0, 1, 2, 3}
Equalization Control Pin (EQn) State
Equalization Level
0
1
Off
Low
Receive Equalization Level Selection for an Input INn
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16
OPERATION IN SMBUS MODE
nificant bits of the slave address are hard wired inside the
DS25CP104A/DS25CP114 and are “101”. The four least sig-
nificant bits of the address are assigned to pins ADDR3-
ADDR0 and are set by connecting these pins to GND for a
low (0) or to VCC for a high (1). The complete slave address
is shown in the following table:
The DS25CP104A/DS25CP114 operates as a slave on the
System Management Bus (SMBus) when the EN_smb pin is
set to a high (1). Under these conditions, the SCL pin is a clock
input while the SDA pin is a serial data input pin.
Device Address
Based on the SMBus 2.0 specification, the DS25CP104A/
DS25CP114 has a 7-bit slave address. The three most sig-
TABLE 7. Slave Address
1
0
1
ADDR3
ADDR2
ADDR1
ADDR0
LSB
MSB
This slave address configuration allows up to sixteen
DS25CP104A/DS25CP114 devices on a single SMBus bus.
2) The Device (Slave) drives an ACK bit (“0”).
3) The Host drives the 8-bit Register Address.
4) The Device drives an ACK bit (“0”).
5) The Host drives the 8-bit data byte.
6) The Device drives an ACK bit “0”.
Transfer of Data via the SMBus
During normal operation the data on SDA must be stable dur-
ing the time when SCK is high.
7) The Host drives a STOP condition.
There are three unique states for the SMBus:
The WRITE transaction is completed, the bus goes Idle and
communication with other SMBus devices may now occur.
START: A HIGH to LOW transition on SDA while SCK is high
indicates a message START condition.
STOP: A LOW to HIGH transition on SDA while SCK is high
indicates a message STOP condition.
Reading From a Register
To read a register, the following protocol is used (see SMBus
2.0 specification):
IDLE: If SCK and SDA are both high for a time exceeding
tBUF from the last detected STOP condition or if they are high
for a total exceeding the maximum specification for tHIGH
then the bus will transfer to the IDLE state.
1) The Host drives a START condition, the 7-bit SMBus ad-
dress, and a “0” indicating a WRITE.
2) The Device (Slave) drives an ACK bit (“0”).
3) The Host drives the 8-bit Register Address.
4) The Device drives an ACK bit (“0”).
SMBus Transactions
A transaction begins with the host placing the DS25CP104A
SMBus into the START condition, then a byte (8 bits) is trans-
ferred, MSB first, followed by a ninth ACK bit. ACK bits are ‘0’
to signify an ACK, or ‘1’ to signify NACK, after this the host
holds the SCL line low, and waits for the receiver to raise the
SDA line as an ACKnowledge that the byte has been re-
ceived.
5) The Host drives a START condition.
6) The Host drives the 7-bit SMBus Address, and a “1” indi-
cating a READ.
7) The Device drives an ACK bit “0”.
8) The Device drives the 8-bit data value (register contents).
9) The Host drives a NACK bit “1” indicating end of READ
transfer.
Writing to a Register
To write a register, the following protocol is used (see SMBus
2.0 specification):
10) The Host drives a STOP condition.
The READ transaction is completed, the bus goes Idle and
communication with other SMBus devices may now occur.
1) The Host drives a START condition, the 7-bit SMBus ad-
dress, and a “0” indicating a WRITE.
17
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Register Descriptions
There are five data registers in the DS25CP104A/DS25CP114 accessible via the SMBus interface.
TABLE 8. SMBus Data Registers
Address
(hex)
Name
Access
Description
0
1
2
3
4
Switch Configuration
PE Level Select
EQ Level Select
Control
R/W
R/W
R/W
R/W
RO
Switch Configuration Register
Transmit Pre-emphasis Level Select Register
Receive Equalization Level Select Register
Powerdown, LOS Enable and Pin Control Register
Loss Of Signal (LOS) Reporting Register
LOS
30073610
FIGURE 10. Registers Block Diagram
SWITCH CONFIGURATION REGISTER
The Switch Configuration register is utilized to configure the switch. The following two tables show the Switch Configuration Register
mapping and associated truth table.
Bit
Default
00
Bit Name
Access
R/W
Description
D[1:0]
D[3:2]
D[5:4]
D[7:6]
Input Select 0
Input Select 1
Input Select 2
Input Select 3
Selects which input is routed to the OUT0.
Selects which input is routed to the OUT1.
Selects which input is routed to the OUT2.
Selects which input is routed to the OUT3.
00
R/W
00
R/W
00
R/W
TABLE 9. Switch Configuration Register Truth Table
Input Routed to the OUT0
D1
0
D0
0
IN0
IN1
IN2
IN3
0
1
1
0
1
1
The truth tables for the OUT1, OUT2, and OUT3 outputs are identical to this table.
The switch configuration logic has a SmartPWDN circuitry which automatically optimizes the device's power consumption based
on the switch configuration (i.e. It places unused I/O blocks and other unused circuitry in the power down state).
www.national.com
18
PE LEVEL SELECT REGISTER
The PE Level Select register selects the pre-emphasis level for each of the outputs. The following two tables show the register
mapping and associated truth table.
Bit
Default
00
Bit Name
Access
R/W
Description
D[1:0]
D[3:2]
D[5:4]
D[7:6]
PE Level Select 0
PE Level Select 1
PE Level Select 2
PE Level Select 3
Sets pre-emphasis level on the OUT0.
Sets pre-emphasis level on the OUT1.
Sets pre-emphasis level on the OUT2.
Sets pre-emphasis level on the OUT3.
00
R/W
00
R/W
00
R/W
TABLE 10. PE Level Select Register Truth Table
Pre-Emphasis Level for the OUT0
D1
0
D0
0
Off
Low
0
1
1
0
Medium
High
1
1
NOTE: The truth tables for the OUT1, OUT2, and OUT3 outputs are identical to this table.
EQ LEVEL SELECT REGISTER
The EQ Level Select register selects the equalization level for each of the inputs. The following two tables show the register mapping
and associated truth table.
Bit
Default
00
Bit Name
Access
R/W
Description
D[1:0]
D[3:2]
D[5:4]
D[7:6]
EQ Level Select 0
EQ Level Select 1
EQ Level Select 2
EQ Level Select 3
Sets equalization level on the IN0.
Sets equalization level on the IN1.
Sets equalization level on the IN2.
Sets equalization level on the IN3.
00
R/W
00
R/W
00
R/W
TABLE 11. EQ Level Select Register Truth Table
Equalization Level for the IN0
D1
0
D0
0
Off
Low
0
1
1
0
Medium
High
1
1
NOTE: The truth tables for the IN1, IN2, and IN3 outputs are identical to this table.
19
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CONTROL REGISTER
The Control register enables SoftPWDN control, individual output power down (PWDNn) control, LOS Circuitry Enable control, PE
Level Select Enable control and EQ Level Select Enable control via the SMBus. The following table shows the register mapping.
Bit
Default
Bit Name
Access Description
D[3:0]
1111
PWDNn
R/W
R/W
R/W
R/W
Writing a [0] to the bit D[n] will power down the output OUTn
when either the PWDN pin OR the Control Register bit D[7]
(SoftPWDN) is set to a high [1].
D[4]
D[5]
D[6]
0
0
0
Ignore_External_EQ
Ignore_External_PE
EN_LOS
Writing a [1] to the bit D[4] will ignore the state of the external
EQ pins and will allow setting the EQ levels via the SMBus
interface.
Writing a [1] to the bit D[5] will ignore the state of the external
PE pins and will allow setting the PE levels via the SMBus
interface.
Writing a [1] to the bit D[6] will enable the LOS circuitry and
receivers on all four inputs. The SmartPWDN circuitry will not
disable any of the inputs nor any supporting LOS circuitry
depending on the switch configuration.
D[7]
0
SoftPWDN
R/W
Writing a [0] to the bit D[7] will place the device into the power
down mode. This pin is ORed together with the PWDN pin.
TABLE 12. Power Modes Truth Table
PWDNn Power Mode
PWDN
SoftPWDN
0
0
x
Power Down Mode. In this mode, all circuitry is shut down except the
minimum required circuitry for the LOS and SMBus Slave operation. The
SMBus circuitry allows enabling the LOS circuitry and receivers on all inputs
in this mode by setting the EN_LOS bit to a [1].
0
1
1
1
0
1
x
x
x
Power Up Mode. In this mode, the SmartPWDN circuitry will automatically
power down any unused I/O and logic blocks and other supporting circuitry
depending on the switch configuration.
An output will be enabled only when the SmartPWDN circuitry indicates that
that particular output is needed for the particular switch configuration and
the respective PWDNn bit has logic high [1].
An input will be enabled when the SmartPWDN circuitry indicates that that
particular input is needed for the particular switch configuration or the
EN_LOS bit is set to a [1].
LOS REGISTER
The LOS register reports an open inputs fault condition for each of the inputs. The following table shows the register mapping.
Bit
Default
Bit Name
Access Description
D[0]
0
LOS0
RO
RO
RO
RO
RO
Reading a [0] from the bit D[0] indicates an open inputs fault condition on
the IN0. A [1] indicates presence of a valid signal.
D[1]
D[2]
0
LOS1
Reading a [0] from the bit D[1] indicates an open inputs fault condition on
the IN1. A [1] indicates presence of a valid signal.
0
LOS2
Reading a [0] from the bit D[2] indicates an open inputs fault condition on
the IN2. A [1] indicates presence of a valid signal.
D[3]
0
LOS3
Reading a [0] from the bit D[3] indicates an open inputs fault condition on
the IN3. A [1] indicates presence of a valid signal.
D[7:4]
0000
Reserved
Reserved for future use. Returns undefined value when read.
www.national.com
20
INPUT INTERFACING
ommended that SMT resistors sized 0402 or smaller be used
and the mounting distance to the DS25CP114 pins kept under
200 mils.
The DS25CP104A/DS25CP114 accepts differential signals
and allows simple AC or DC coupling. With a wide common
mode range, the DS25CP104A/DS25CP114 can be DC-cou-
pled with all common differential drivers (i.e. LVPECL, LVDS,
CML). The following three figures illustrate typical DC-cou-
pled interface to common differential drivers.
When using the DS25CP114 in a limited multi-drop topology,
any transmission line stubs should be kept very short to min-
imize any negative effects on signal quality. A single termi-
nation resistor or resistor network that matches the differential
line impedance should be used. If DS25CP114 input pairs
from two separate devices are to be connected to a single
differential output, it is recommended that the DS25CP114
devices are mounted directly opposite of each other. One on
top of the PCB and the other directly under the first on the
bottom of the PCB, this keeps the distance between inputs
equal to the PCB thickness.
The DS25CP104A inputs are internally terminated with a
100Ω resistor for optimal device performance, reduced com-
ponent count, and minimum board space. External input ter-
minations on the DS25CP114 need to be placed as close as
possible to the device inputs to achieve equivalent AC per-
formance. When all four inputs are utilized it may be neces-
sary to alternate between the top and bottom layers to achieve
the minimum device input to termination distance. It is rec-
Typical LVDS Driver DC-Coupled Interface to DS25CP104A Inpu3t0073631
30073632
Typical CML Driver DC-Coupled Interface to DS25CP104A Input
30073633
Typical LVPECL Driver DC-Coupled Interface to DS25CP104A Input
Note: DS25CP114 requires external 100Ω input termination.
21
www.national.com
OUTPUT INTERFACING
impedance inputs. While most differential receivers have a
common mode input range that can accomodate LVDS com-
pliant signals, it is recommended to check respective
receiver's data sheet prior to implementing the suggested in-
terface implementation.
The DS25CP104A/DS25CP114 outputs signals that are com-
pliant to the LVDS standard. Its outputs can be DC-coupled
to most common differential receivers. The following figure
illustrates typical DC-coupled interface to common differential
receivers and assumes that the receivers have high
30073634
Typical Output DC-Coupled Interface to an LVDS, CML or LVPECL Receiver
www.national.com
22
Typical Performance Characteristics
30073650
30073652
Total Jitter as a Function of Data Rate
Residual Jitter as a Function of Data Rate, FR4 Stripline
Length and EQ Level
30073651
30073653
Residual Jitter as a Function of Data Rate, FR4 Stripline
Residual Jitter as a Function of Data Rate, FR4 Stripline
Length and EQ Level
Length and EQ Level
30073654
30073656
Residual Jitter as a Function of Data Rate, FR4 Stripline
Residual Jitter as a Function of Data Rate, FR4 Stripline
Length and PE Level
Length and PE Level
23
www.national.com
30073657
30073655
Supply Current as a Function of Data Rate and PE Level
Residual Jitter as a Function of Data Rate, FR4 Stripline
Length and PE Level
www.national.com
24
Typical Performance
30073662
30073663
A 2.5 Gbps NRZ PRBS-23 without PE
After 30" Differential FR-4 Stripline
H: 75 ps / DIV, V: 100 mV / DIV
A 3.125 Gbps NRZ PRBS-23 without PE
After 30" Differential FR-4 Stripline
H: 50 ps / DIV, V: 100 mV / DIV
30073660
A 2.5 Gbps NRZ PRBS-23 with High PE
After 2" Differential FR-4 Microstrip
H: 75 ps / DIV, V: 100 mV / DIV
A 3.125 Gbps NRZ PRBS-23 with 3H00i7g36h61PE
After 2" Differential FR-4 Microstrip
H: 50 ps / DIV, V: 100 mV / DIV
30073664
A 2.5 Gbps NRZ PRBS-23 with High PE
After 30" Differential FR-4 Stripline
H: 75 ps / DIV, V: 100 mV / DIV
A 3.125 Gbps NRZ PRBS-23 with 3H00i7g36h65PE
After 30" Differential FR-4 Stripline
H: 50 ps / DIV, V: 100 mV / DIV
25
www.national.com
30073667
30073666
A 3.125 Gbps NRZ PRBS-23 without EQ
After 60" Differential FR-4 Stripline
H: 50 ps / DIV, V: 100 mV / DIV
A 2.5 Gbps NRZ PRBS-23 without EQ
After 60" Differential FR-4 Stripline
H: 75 ps / DIV, V: 100 mV / DIV
30073669
30073668
A 3.125 Gbps NRZ PRBS-23 with High EQ
A 2.5 Gbps NRZ PRBS-23 with High EQ
After 60" Differential FR-4 Stripline
H: 75 ps / DIV, V: 100 mV / DIV
After 60" Differential FR-4 Stripline
H: 50 ps / DIV, V: 100 mV / DIV
www.national.com
26
Physical Dimensions inches (millimeters) unless otherwise noted
Order Number DS25CP104ATSQ
Order Number DS25CP114TSQ
NS Package Number SQA40A
(See AN-1187 for PCB Design and Assembly Recommendations)
27
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Notes
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