SP3481EN-L [ROCHESTER]
LINE TRANSCEIVER, PDSO8, LEAD FREE, PLASTIC, SOIC-8;型号: | SP3481EN-L |
厂家: | Rochester Electronics |
描述: | LINE TRANSCEIVER, PDSO8, LEAD FREE, PLASTIC, SOIC-8 驱动 信息通信管理 光电二极管 接口集成电路 驱动器 |
文件: | 总10页 (文件大小:807K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
®
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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