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SP3481ENL/TR [EXAR]

Line Driver/Receiver, 1 Driver, BICMOS, PDSO8;
SP3481ENL/TR
型号： SP3481ENL/TR
厂家： EXAR CORPORATION    EXAR CORPORATION
描述：

Line Driver/Receiver, 1 Driver, BICMOS, PDSO8

驱动 信息通信管理 光电二极管 驱动器
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®
SP3481/SP3485  
+3.3V Low Power Half-Duplex RS-485  
Transceivers with 10Mbps Data Rate  
■ RS-485 and RS-422 Transceivers  
■ Operates from a single +3.3V supply  
■ Interoperable with +5.0V logic  
■ Driver/Receiver Enable  
■ Low Power Shutdown Mode (SP3481)  
■ -7V to +12V Common-Mode Input  
Voltage Range  
■ Allows up to 32 transceivers on  
the serial bus  
■ Compatibility with the industry  
standard 75176 pinout  
■ Driver Output Short-Circuit Protection  
Now Available in Lead Free Packaging  
DESCRIPTION  
The SP3481 and the SP3485 are a family of +3.3V low power half-duplex transceivers that  
meet the specifications of the RS-485 and RS-422 serial protocols. These devices are pin-to-  
pin compatible with the Sipex SP481, SP483, and SP485 devices as well as popular industry  
standards. The SP3481 and the SP3485 feature Sipex's BiCMOS process, allowing low power  
operation without sacrificing performance. The SP3481 and SP3485 meet the electrical  
specifications of RS-485 and RS-422 serial protocols up to 10Mbps under load. The SP3481  
is equipped with a low power Shutdown mode.  
RO  
1
2
3
4
R
8 Vcc  
7 B  
RE  
DE  
DI  
6 A  
5 GND  
D
SP3481 and SP3485  
10/15/02  
SP3481/3485 Low Power Half-Duplex RS485 Transceivers  
© Copyright 2002 Sipex Corporation  
ABSOLUTE MAXIMUM RATINGS  
These are stress ratings only and functional operation of the device at  
these ratings or any other above those indicated in the operation sections  
of the specifications below is not implied. Exposure to absolute maximum  
rating conditions for extended periods of time may affect reliability.  
VCC ............................................................................................. +6.0V  
Input Voltages  
Logic ..................................................... -0.3V to +6.0V  
Drivers ................................................... -0.3V to +6.0V  
Receivers ............................................................ ±15V  
Output Voltages  
Drivers .................................................................. ±15V  
Receivers .............................................. -0.3V to +6.0V  
Storage Temperature ................................................ .-65˚C to +150˚C  
Power Dissipation per Package  
8-pin NSOIC (derate 6.90mW/oC above +70oC) ..................... 600mW  
8-pin PDIP (derate 11.8mW/oC above +70oC) ...................... 1000mW  
SPECIFICATIONS  
TAMB = TMIN to TMAX and VCC = +3.3V ± 5% unless otherwise noted.  
PARAMETERS  
MIN.  
TYP.  
MAX. UNITS CONDITIONS  
SP3481/SP3485 DRIVER  
DC Characteristics  
Differential Output Voltage  
Differential Output Voltage  
GND  
2
VCC  
VCC  
Volts Unloaded; R = ∞; Figure 1  
Volts with load; R = 50Ω; (RS-422); Figure 1  
Differential Output Voltage  
Change in Magnitude of Driver  
Differential Output Voltage for  
Complimentary States  
Driver Common-Mode  
Output Voltage  
1.5  
VCC  
Volts with load; R = 27Ω; (RS-485); Figure 1  
0.2  
3
Volts R = 27Ω or R = 50Ω; Figure 1  
Volts R = 27Ω or R = 50Ω; Figure 1  
Volts Applies to DE, DI, RE  
Volts Applies to DE, DI, RE  
Input High Voltage  
Input Low Voltage  
2.0  
0.8  
Input Current  
±10  
µA  
Applies to DE, DI, RE  
Driver Short-Circuit Current  
VOUT = HIGH  
VOUT = LOW  
±250  
±250  
mA -7V ≤ VO ≤ +12V  
mA -7V ≤ VO ≤ +12V  
SP3481/SP3485 DRIVER  
AC Characteristics  
Maximum Data Rate  
10  
20  
20  
Mbps RE = VCC, DE = VCC  
Driver Input to Output, tPLH  
Driver Input to Output, tPHL  
40  
40  
60  
60  
ns  
ns  
Figures 2 and 8  
Figures 2 and 8  
Differential Driver Skew  
Driver Rise or Fall Time  
Driver Enable to Output High  
Driver Enable to Output Low  
Driver Disable Time from Low  
Driver Disable Time from High  
2
5
52  
60  
40  
60  
10  
20  
120  
120  
120  
120  
ns  
ns  
ns  
ns  
ns  
ns  
tDO1 - tDO2 Figures 2 and 9  
From 10% to 90% ; Figures 3 and  
Figures 4 and 10  
Figures 5 and 10  
Figures 5 and 10  
9
Figures 4 and 10  
SP3481/SP3485 RECEIVER  
DC Characteristics  
Differential Input Threshold  
Input Hysteresis  
Output Voltage High  
Output Voltage Low  
Three-State (High Impedance)  
Output Current  
-0.2  
+0.2  
Volts -7V ≤ VCM ≤ +12V  
mV VCM = 0V  
Volts VID = +200mV, -1.5mA  
Volts VID = -200mV, 2.5mA  
20  
15  
VCC-0.4  
0.4  
+1  
µA  
kΩ  
0V ≤ VO ≤ VCC; RE = VCC  
-7V ≤ VCM ≤ +12V  
Input Resistance  
12  
7
Input Current (A, B); VIN = 12V  
Input Current (A, B); VIN = -7V  
Short-Circuit Current  
1.0  
-0.8  
60  
mA  
mA  
mA  
DE = 0V, VCC = 0V or 3.6V, VIN = 12V  
DE = 0V, VCC = 0V or 3.6V, VIN = -7V  
0V ≤ VCM ≤ VCC  
10/15/02  
SP3481/3485 Low Power Half-Duplex RS485 Transceivers  
© Copyright 2000 Sipex Corporation  
2
SPECIFICATIONS (continued)  
TAMB = TMIN to TMAX and VCC = +3.3V ± 5% unless otherwise noted.  
PARAMETERS  
MIN.  
TYP.  
MAX. UNITS CONDITIONS  
SP3481/SP3485 RECEIVER  
AC Characteristics  
Maximum Data Rate  
Receiver Input to Output, tPLH  
10  
40  
Mbps  
ns  
ns  
RE = 0V, DE = 0V  
Figures 6 and 11  
70  
70  
100  
70  
TAMB = +25oC, VCC = +3.3V,  
Figures 6 and 11  
Receiver Input to Output, tPHL  
40  
100  
70  
ns  
ns  
Figures 6 and 11  
TAMB = +25oC, VCC = +3.3V,  
Figures 6 and 11  
Differential Receiver Skew  
Receiver Enable to  
Output Low  
4
ns  
ns  
tRSKEW = tRPHL - tRPLH, Figures 6 and 11  
Figures 7 and 12; S1 closed, S2 open  
35  
60  
Receiver Enable to  
Output High  
Receiver Disable from Low  
Receiver Disable from High  
35  
35  
35  
60  
60  
60  
ns  
ns  
ns  
Figures 7 and 12; S2 closed, S1 open  
Figures 7 and 12; S1 closed, S2 open  
Figures 7 and 12; S2 closed, S1 open  
SP3481 Shutdown Timing  
Time to Shutdown  
Driver Enable from Shutdown  
to Output High  
Driver Enable from Shutdown  
to Output Low  
Receiver Enable from  
Shutdown to Output High  
Receiver Enable from  
Shutdown to Output Low  
50  
75  
65  
65  
50  
50  
200  
150  
150  
200  
200  
ns  
ns  
ns  
ns  
ns  
RE = 3.3V, DE = 0V  
Figures 4 and 10  
Figures 5 and 10  
Figures 7 and 12; S2 closed, S1 open  
Figures 7 and 12; S1 closed, S2 open  
POWER REQUIREMENTS  
Supply Current  
SP3481/3485  
No Load  
1000  
800  
2000  
1500  
µA  
µA  
RE, DI = 0V or VCC; DE = VCC  
RE = 0V, DI = 0V or VCC; DE = 0V  
SP3481  
Shutdown Mode  
10  
µA  
DE = 0V, RE=VCC  
10/15/02  
SP3481/3485 Low Power Half-Duplex RS485 Transceivers  
© Copyright 2002 Sipex Corporation  
3
PIN FUNCTION  
Pin 1 – RO – Receiver Output.  
RO  
RE  
DE  
DI  
1
2
3
4
8
7
6
5
V
B
A
R
CC  
Pin 2 – RE – Receiver Output Enable Active LOW.  
Pin 3 – DE – Driver Output Enable Active HIGH.  
Pin 4 – DI – Driver Input.  
Pin 5 – GND – Ground Connection.  
D
GND  
Pin 6 – A – Driver Output/Receiver Input  
Non-inverting.  
Top View  
Pin 7 – B – Driver Output/Receiver Input Inverting.  
Pin 8 – VCC  
SP3481/SP3485  
Pinout (Top View)  
DESCRIPTION  
Receivers  
The SP3481 and the SP3485 are 2 members  
in the family of +3.3V low power half-duplex  
transceivers that meet the specifications of the  
RS-485 and RS-422 serial protocols. These  
devices are pin-to-pin compatible with the Sipex  
SP481, SP483, and SP485 devices as well as  
popular industry standards. The SP3481 and  
the SP3485 feature Sipex's BiCMOS process  
allowing low power operation without sacrificing  
performance.  
The SP3481 and SP3485 receivers have  
differential inputs with an input sensitivity as  
low as ±200mV. Input impedance of the  
receivers is typically 15kΩ (12kΩ minimum).  
A wide common mode range of -7V to +12V  
allows for large ground potential differences  
between systems. The receivers of the SP3481  
and SP3485 have a tri-state enable control pin.  
A logic LOW on RE (pin 2) will enable the  
receiver, alogicHIGHonRE(pin2)willdisable  
the receiver.  
Drivers  
ThereceiversoftheSP3481andSP3485operate  
up to 10Mbps. The receiver for each of the three  
devices is equipped with fail-safe. Fail-safe  
guarantees that the receiver output will be in a  
HIGH state when the input is left unconnected.  
The driver outputs of the SP3481 and SP3485  
are differential outputs meeting the RS-485 and  
RS-422 standards. The typical voltage output  
swing with no load will be 0 Volts to +3.3 Volts.  
With a load of 54Ω across the differential  
outputs, the drivers maintain greater than  
1.5V voltage levels. The drivers of the SP3481  
and SP3485 have an enable control line which  
is active HIGH. A logic HIGH on DE (pin 3)  
will enable the differential driver outputs.  
A logic LOW on DE (pin 3) will tri-state the  
driver outputs.  
Shutdown Mode for the SP3481  
TheSP3481 isequippedwithaShutdownmode.  
To enable the Shutdown state, both the driver  
and receiver must be disabled simultaneously.  
A logic LOW on DE (pin 3) and a logic HIGH on  
RE (pin 2) will put the SP3481 into Shutdown  
mode. In Shutdown, supply current will drop to  
typical 1µA, 10µA maximum.  
The tranceivers in the SP3481 and SP3485  
operate up to 10Mbps. The 250mA ISC  
maximum limit on the driver output allows  
the SP3481 and the SP3485 to withstand an  
infinite short circuit over the -7.0V to +12.0V  
common mode range without catastrophic  
damage to the IC.  
10/15/02  
SP3481/3485 Low Power Half-Duplex RS485 Transceivers  
© Copyright 2000 Sipex Corporation  
4
VDM  
R
R
RL = 27Ω  
S1  
D
OUT  
VOD  
D
GENERATOR  
(NOTE 1)  
50Ω  
CL  
= 15pF  
(NOTE 2)  
VOC  
VCC  
VCC  
V
OH + VOL  
VOM  
=
1.5V  
2
Figure 1. Driver DC Test Load Circuit  
Figure 2. Driver Propagation Delay Test Circuit  
S1  
D
OUT  
RL = 110Ω  
CL  
RL =  
60Ω  
OUT  
D
C
L
= 50pF  
(NOTE 2)  
GENERATOR  
(NOTE 1)  
GENERATOR  
(NOTE 1)  
50Ω  
50Ω  
VCC  
CL = 15pF (NOTE 2)  
V
OH + VOL  
VOM  
=
1.5V  
2
Figure 4. Driver Enable and Disable Timing Circuit,  
Output HIGH  
Figure 3. Driver Differential Output Delay and Transition  
Time Circuit  
VCC  
OUT  
R
L
= 110Ω  
VID  
R
S1  
GENERATOR  
(NOTE 1)  
50Ω  
0V OR 3V  
D
OUT  
C
L
= 15pF  
(NOTE 2)  
C
L
= 50pF  
(NOTE 2)  
GENERATOR  
(NOTE 1)  
50Ω  
1.5V  
0V  
V
OM = VCC  
2
Figure 6. Receiver Propagation Delay Test Circuit  
Figure 5. Driver Enable and Disable Timing Circuit,  
Output LOW  
S1  
S3  
1.5V  
VCC  
1k  
-1.5V  
VID  
R
S2  
CL = 15pF  
(NOTE 2)  
GENERATOR  
(NOTE 1)  
50Ω  
Figure 7. Receiver Enable and Disable Timing Circuit  
INPUTS  
OUTPUTS  
INPUTS  
OUTPUTS  
LINE  
RE DE DI CONDITION  
RE  
DE  
0
A - B  
+0.2V  
R
1
B
0
A
1
0
0
0
1
X
X
X
1
1
0
1
0
No Fault  
No Fault  
X
0
-0.2V  
0
1
0
0
Inputs Open  
X
1
X
Z
Z
0
Z
Table 1. Transmit Function Truth Table  
Table 2. Receive Function Truth Table  
10/15/02  
SP3481/3485 Low Power Half-Duplex RS485 Transceivers  
© Copyright 2002 Sipex Corporation  
5
3V  
0V  
1.5V  
1.5V  
INPUT  
3V  
0V  
IN  
1.5V  
1.5V  
t
PLH  
t
PHL  
V
OH  
VOM  
VOM  
Y OUTPUT  
t
DO1  
t
DO2  
V
OL  
2.0V  
t
PHL  
t
PLH  
90%  
90%  
VOH  
50%  
10%  
50%  
10%  
OUT  
Z OUTPUT  
V
OM  
VOM  
-2.0V  
VOL  
t
TD  
t
TD  
V
OM  
=
OH + VOL  
2
≈ 1.5V  
V
Figure 8. Driver Propagation Delay Waveforms  
Figure 9. Driver Differential Output Delay and Transition  
Time Waveforms  
3V  
1.5V  
1.5V  
DE  
0V  
3V  
t
PHZ  
t
PZH  
INPUT  
1.5V  
1.5V  
V
OH  
0.25V  
0.25V  
0V  
OUTPUT  
HIGH  
V
OM  
t
RPLH  
t
RPHL  
0V  
V
CC  
V
OM  
OUTPUT  
V
OM  
t
PZL  
t
PLZ  
V
CC  
0V  
OUTPUT  
LOW  
V
OM  
V
2
CC  
V
OM  
=
VOL  
V
OH + VOL  
2
≈ 1.5V  
V
OM  
=
Figure 10. Driver Enable and Disable Timing Waveforms  
Figure 11. Receiver Propagation Delay Waveforms  
S1 is open  
S2 is closed  
S3 = 1.5V  
S1 is closed  
S2 is open  
S3 = -1.5V  
3V  
3V  
1.5V  
1.5V  
1.5V  
1.5V  
RE  
RE  
0V  
0V  
t
t
PRZL  
PRSL  
t
PRZH  
PRSH  
t
PRHZ  
t
PRLZ  
t
V
CC  
V
OH  
10%  
1.5V  
OUTPUT  
OUTPUT  
1.5V  
10%  
V
OL  
0V  
Figure 12. Receiver Enable and Disable Waveforms  
NOTE 1: The input pulse is supplied by a generator with the following characteristics:  
PRR=250KHz, 50% duty cycle, tr < 6.0ns, Z0=50Ω.  
NOTE 2: CL includes probe and stray capacitance.  
10/15/02  
SP3481/3485 Low Power Half-Duplex RS485 Transceivers  
© Copyright 2000 Sipex Corporation  
6
PACKAGE: PLASTIC  
DUAL–IN–LINE  
(NARROW)  
E1  
E
D1 = 0.005" min.  
(0.127 min.)  
A1 = 0.015" min.  
(0.381min.)  
D
A = 0.210" max.  
(5.334 max).  
C
A2  
Ø
L
B1  
B
e
= 0.300 BSC  
(7.620 BSC)  
e = 0.100 BSC  
(2.540 BSC)  
A
ALTERNATE  
END PINS  
(BOTH ENDS)  
DIMENSIONS (Inches)  
Minimum/Maximum  
(mm)  
8–PIN  
0.115/0.195  
(2.921/4.953)  
A2  
0.014/0.022  
(0.356/0.559)  
B
0.045/0.070  
B1  
C
(1.143/1.778)  
0.008/0.014  
(0.203/0.356)  
0.355/0.400  
(9.017/10.160)  
D
0.300/0.325  
(7.620/8.255)  
E
0.240/0.280  
E1  
L
(6.096/7.112)  
0.115/0.150  
(2.921/3.810)  
0°/ 15°  
(0°/15°)  
Ø
10/15/02  
SP3481/3485 Low Power Half-Duplex RS485 Transceivers  
© Copyright 2002 Sipex Corporation  
7
PACKAGE: PLASTIC  
SMALL OUTLINE (SOIC)  
(NARROW)  
E
H
h x 45°  
D
A
Ø
A1  
L
e
B
DIMENSIONS (Inches)  
Minimum/Maximum  
(mm)  
8–PIN  
A
A1  
B
D
E
0.053/0.069  
(1.346/1.748)  
0.004/0.010  
(0.102/0.249  
0.014/0.019  
(0.35/0.49)  
0.189/0.197  
(4.80/5.00)  
0.150/0.157  
(3.802/3.988)  
e
0.050 BSC  
(1.270 BSC)  
H
h
0.228/0.244  
(5.801/6.198)  
0.010/0.020  
(0.254/0.498)  
L
0.016/0.050  
(0.406/1.270)  
Ø
0°/8°  
(0°/8°)  
10/15/02  
SP3481/3485 Low Power Half-Duplex RS485 Transceivers  
© Copyright 2000 Sipex Corporation  
8
ORDERING INFORMATION  
Model  
Temperature Range  
Package  
SP3481CN .................................................................................... 0˚C to +70˚C ............................................................................ 8-pin Narrow SOIC  
SP3481CP .................................................................................... 0˚C to +70˚C ................................................................................ 8-pin Plastic DIP  
SP3481EN .................................................................................. .-40˚C to +85˚C .......................................................................... 8-pin Narrow SOIC  
SP3481EP ................................................................................... -40˚C to +85˚C .............................................................................. 8-pin Plastic DIP  
SP3485CN .................................................................................... 0˚C to +70˚C ............................................................................ 8-pin Narrow SOIC  
SP3485CP .................................................................................... 0˚C to +70˚C ................................................................................ 8-pin Plastic DIP  
SP3485EN ................................................................................... -40˚C to +85˚C .......................................................................... 8-pin Narrow SOIC  
SP3485EP ................................................................................... -40˚C to +85˚C .............................................................................. 8-pin Plastic DIP  
Please consult the factory for pricing and availability on a Tape-On-Reel option.  
Available in lead free packaging. To order, add "-L" suffix to the part number.  
Example: SP3481CN = standard; SP3481CN -L = lead free.  
Co rp o ra tio n  
SIGNAL PROCESSING EXCELLENCE  
Sipex Corporation  
Headquarters and  
Sales Office  
233 South Hillview Drive  
Milpitas, CA 95035  
TEL: (408) 934-7500  
FAX: (408) 935-7600  
Sales Office  
22 Linnell Circle  
Billerica, MA 01821  
TEL: (978) 667-8700  
FAX: (978) 670-9001  
e-mail: sales@sipex.com  
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the  
application or use of any product or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others.  
10/15/02  
SP3481/3485 Low Power Half-Duplex RS485 Transceivers  
© Copyright 2002 Sipex Corporation  
9

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