DS90C401 [NSC]
Dual Low Voltage Differential Signaling (LVDS) Driver; 双通道低电压差分信号（ LVDS ）驱动器
| 型号： | DS90C401 |
| 厂家： | 
National Semiconductor |
| 描述： | Dual Low Voltage Differential Signaling (LVDS) Driver |
| 文件： | 总11页 (文件大小：648K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
August 2005
DS90C401
Dual Low Voltage Differential Signaling (LVDS) Driver
General Description
Features
n Ultra low power dissipation
n Operates above 155.5 Mbps
n Standard TIA/EIA-644
The DS90C401 is a dual driver device optimized for high
data rate and low power applications. This device along with
the DS90C402 provides a pair chip solution for a dual high
speed point-to-point interface. The DS90C401 is a current
mode driver allowing power dissipation to remain low even at
high frequency. In addition, the short circuit fault current is
also minimized. The device is in a 8 lead small outline
package. The differential driver outputs provides low EMI
with its low output swings typically 340 mV.
n 8 Lead SOIC Package saves space
n Low Differential Output Swing typical 340 mV
Connection Diagram
10001301
Order Number DS90C401M
See NS Package Number M08A
Functional Diagram
10001302
© 2005 National Semiconductor Corporation
DS100013
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Absolute Maximum Ratings (Note 1)
Maximum Junction
Temperature
+150˚C
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
ESD Rating
(HBM, 1.5 kΩ, 100 pF)
(EIAJ, 0 Ω, 200 pF)
≥ 3,500V
≥ 250V
Supply Voltage (VCC
Input Voltage (DIN
)
−0.3V to +6V
−0.3V to (VCC + 0.3V)
−0.3V to (VCC + 0.3V)
)
Output Voltage (DOUT+, DOUT−
)
Recommended Operating
Conditions
Short Circuit Duration
(DOUT+, DOUT−
)
Continuous
Min
Typ
Max
Units
@
Maximum Package Power Dissipation +25˚C
M Package
Supply Voltage (VCC
Operating Free Air
Temperature (TA)
)
+4.5
+5.0
+5.5
V
1068 mW
Derate M Package
8.5 mW/˚C above +25˚C
−65˚C to +150˚C
−40
+25
+85
˚C
Storage Temperature Range
Lead Temperature Range
Soldering (4 sec.)
+260˚C
Electrical Characteristics
Over supply voltage and operating temperature ranges, unless otherwise specified. (Notes 2, 3)
Symbol
VOD1
Parameter
Differential Output Voltage
Change in Magnitude of VOD1 for
Complementary Output States
Offset Voltage
Conditions
Pin
Min
Typ
340
4
Max
450
35
Units
mV
RL = 100Ω (Figure 1)
DOUT−
,
250
DOUT+
∆VOD1
|mV|
VOS
1.125
1.25
5
1.375
25
V
∆VOS
Change in Magnitude of VOS for
Complementary Output States
Output Voltage High
|mV|
VOH
VOL
IOS
VIH
VIL
II
RL = 100Ω
1.41
1.07
−3.5
1.60
V
V
Output Voltage Low
0.90
Output Short Circuit Current
Input Voltage High
VOUT = 0V (Note 8)
−5.0
VCC
0.8
mA
V
DIN
2.0
GND
−10
Input Voltage Low
V
Input Current
VIN = VCC, GND, 2.5V or 0.4V
ICL = −18 mA
1
−0.8
1.7
3.5
8
+10
µA
V
VCL
ICC
Input Clamp Voltage
−1.5
No Load Supply Current
DIN = VCC or GND
VCC
3.0
5.5
mA
mA
mA
DIN = 2.5V or 0.4V
ICCL
Loaded Supply Current
RL = 100Ω All Channels
VIN = VCC or GND (all inputs)
14.0
Switching Characteristics
VCC = +5.0V 10%, TA = −40˚C to +85˚C (Notes 3, 4, 5, 6, 9)
Symbol
tPHLD
tPLHD
tSKD
Parameter
Conditions
Min
Typ
Max
3.5
3.5
900
1.0
3.0
2.0
2.0
Units
ns
Differential Propagation Delay High to Low
Differential Propagation Delay Low to High
RL = 100Ω, CL = 5 pF
(Figure 2 and Figure 3)
0.5
0.5
0
2.0
2.1
80
ns
Differential Skew |tPHLD – tPLHD
|
ps
tSK1
Channel-to-Channel Skew (Note 4)
Chip to Chip Skew (Note 5)
Rise Time
0
0.3
ns
tSK2
ns
tTLH
0.35
0.35
ns
tTHL
Fall Time
ns
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2
Parameter Measurement Information
10001304
FIGURE 1. Driver VOD and VOS Test Circuit
10001305
FIGURE 2. Driver Propagation Delay and Transition Time Test Circuit
10001306
FIGURE 3. Driver Propagation Delay and Transition Time Waveforms
Typical Application
10001309
FIGURE 4. Point-to-Point Application
3
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current mode requires (as discussed above) that a resistive
termination be employed to terminate the signal and to com-
plete the loop as shown in Figure 4. AC or unterminated
configurations are not allowed. The 3.4 mA loop current will
develop a differential voltage of 340 mV across the 100Ω
termination resistor which the receiver detects with a 240 mV
minimum differential noise margin neglecting resistive line
losses (driven signal minus receiver threshold (340 mV –
100 mV = 240 mV)). The signal is centered around +1.2V
(Driver Offset, VOS) with respect to ground as shown in
Figure 5. Note that the steady-state voltage (VSS) peak-to-
peak swing is twice the differential voltage (VOD) and is
typically 680 mV.
Applications Information
LVDS drivers and receivers are intended to be primarily used
in an uncomplicated point-to-point configuration as is shown
in Figure 4. This configuration provides a clean signaling
environment for the quick edge rates of the drivers. The
receiver is connected to the driver through a balanced media
which may be a standard twisted pair cable, a parallel pair
cable, or simply PCB traces. Typically, the characteristic
impedance of the media is in the range of 100Ω. A termina-
tion resistor of 100Ω should be selected to match the media,
and is located as close to the receiver input pins as possible.
The termination resistor converts the current sourced by the
driver into a voltage that is detected by the receiver. Other
configurations are possible such as a multi-receiver configu-
ration, but the effects of a mid-stream connector(s), cable
stub(s), and other impedance discontinuities as well as
ground shifting, noise margin limits, and total termination
loading must be taken into account.
The current mode driver provides substantial benefits over
voltage mode drivers, such as an RS-422 driver. Its quies-
cent current remains relatively flat versus switching fre-
quency. Whereas the RS-422 voltage mode driver increases
exponentially in most case between 20 MHz–50 MHz. This
is due to the overlap current that flows between the rails of
the device when the internal gates switch. Whereas the
current mode driver switches a fixed current between its
output without any substantial overlap current. This is similar
to some ECL and PECL devices, but without the heavy static
ICC requirements of the ECL/PECL designs. LVDS requires
The DS90C401 differential line driver is a balanced current
source design. A current mode driver, generally speaking
has a high output impedance and supplies a constant cur-
rent for a range of loads (a voltage mode driver on the other
hand supplies a constant voltage for a range of loads).
Current is switched through the load in one direction to
produce a logic state and in the other direction to produce
the other logic state. The typical output current is mere 3.4
mA, a minimum of 2.5 mA, and a maximum of 4.5 mA. The
>
80% less current than similar PECL devices. AC specifi-
cations for the driver are a tenfold improvement over other
existing RS-422 drivers.
10001310
FIGURE 5. Driver Output Levels
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4
Note 3: All typicals are given for: V
= +5.0V, T = +25˚C.
A
CC
Pin Descriptions
Note 4: Channel-to-Channel Skew is defined as the difference between the
propagation delay of the channel and the other channels in the same chip
with an event on the inputs.
TABLE 1. Device Pin Descriptions
Note 5: Chip to Chip Skew is defined as the difference between the mini-
mum and maximum specified differential propagation delays.
Pin No.
4, 8
3, 7
2, 6
5
Name
Description
Note 6: Generator waveform for all tests unless otherwise specified: f = 1
MHz, Z = 50Ω, t ≤ 6 ns, and t ≤ 6 ns.
DIN
TTL/CMOS driver input pins
O
r
f
DOUT+ Non-inverting driver output pin
DOUT− Inverting driver output pin
GND Ground pin
Note 7: ESD Ratings:
HBM (1.5 kΩ, 100 pF) ≥ 3,500V
EIAJ (0Ω, 200 pF) ≥ 250V
Note 8: Output short circuit current (I ) is specified as magnitude only,
OS
1
VCC
Positive power supply pin,
+5.0V 10%
minus sign indicates direction only.
Note 9: C includes probe and jig capacitance.
L
Truth Table
Ordering Information
DIN
L
DOUT+
DOUT−
Operating
Temperature
−40˚C to +85˚C
Package Type/
Number
Order Number
L
H
X
H
L
H
SOP/M08A
DS90C401M
>
DIN 0.8V and
X
Note 1: “Absolute Maximum Ratings” are those values beyond which the
safety of the device cannot be guaranteed. They are not meant to imply that
the devices should be operated at these limits. The table of “Electrical
Characteristics” specifies conditions of device operation.
<
DIN 2.0V
H = Logic high level
L = Logic low level
X = Indeterminant state
Note 2: Current into device pins is defined as positive. Current out of device
pins is defined as negative. All voltages are referenced to ground except:
V
and ∆V
.
OD1
OD1
Typical Performance Characteristics
Power Supply Current
vs Power Supply Voltage
Power Supply Current
vs Temperature
10001311
10001312
5
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Typical Performance Characteristics (Continued)
Power Supply Current
vs Power Supply Voltage
Power Supply Current
vs Temperature
10001313
10001314
Output Short Circuit Current
vs Power Supply Voltage
Differential Output Voltage
vs Power Supply Voltage
10001317
10001316
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6
Typical Performance Characteristics (Continued)
Differential Output Voltage
vs Ambient Temperature
Output Voltage High vs
Power Supply Voltage
10001318
10001319
Output Voltage High vs
Ambient Temperature
Output Voltage Low vs
Power Supply Voltage
10001320
10001321
7
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Typical Performance Characteristics (Continued)
Output Voltage Low vs
Ambient Temperature
Offset Voltage vs
Power Supply Voltage
10001322
10001323
Offset Voltage vs
Ambient Temperature
Power Supply Current
vs Frequency
10001324
10001325
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8
Typical Performance Characteristics (Continued)
Differential Output Voltage
vs Load Resistor
Differential Propagation Delay
vs Power Supply Voltage
10001327
10001328
Differential Propagation Delay
vs Ambient Temperature
Differential Skew vs
Power Supply Voltage
10001330
10001329
9
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Typical Performance Characteristics (Continued)
Differential Skew vs
Ambient Temperature
Differential Transition Time
vs Power Supply Voltage
10001331
10001332
Differential Transition Time
vs Ambient Temperature
10001333
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10
Physical Dimensions inches (millimeters) unless otherwise noted
8-Lead (0.150" Wide) Molded Small Outline Package, JEDEC
Order Number DS90C401M
NS Package Number M08A
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves
the right at any time without notice to change said circuitry and specifications.
For the most current product information visit us at www.national.com.
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