SIPEX SP3485

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
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-topin 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
R
8 Vcc
RE 2
7 B
DE 3
6 A
DI 4
D
5 GND
SP3481 and SP3485
10/15/02
SP3481/3485 Low Power Half-Duplex RS485 Transceivers
1
© 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
SP3481/SP3485 DRIVER
DC Characteristics
Differential Output Voltage
Differential Output Voltage
MIN.
MAX.
UNITS
GND
2
VCC
VCC
Volts
Volts
Unloaded; R = ∞; Figure 1
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
Input High Voltage
Input Low Voltage
Input Current
Driver Short-Circuit Current
VOUT = HIGH
VOUT = LOW
SP3481/SP3485 DRIVER
AC Characteristics
Maximum Data Rate
1.5
VCC
Volts
with load; R = 27Ω; (RS-485); Figure 1
0.2
Volts
R = 27Ω or R = 50Ω; Figure 1
3
0.8
±10
Volts
Volts
Volts
µA
R = 27Ω or R = 50Ω; Figure 1
Applies to DE, DI, RE
Applies to DE, DI, RE
Applies to DE, DI, RE
±250
±250
mA
mA
Driver Input to Output, tPLH
20
40
60
ns
Figures 2 and 8
Driver Input to Output, tPHL
20
40
60
ns
Figures 2 and 8
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 9
Figures 4 and 10
Figures 5 and 10
Figures 5 and 10
Figures 4 and 10
+0.2
Volts
mV
Volts
Volts
2.0
10
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
SP3481/SP3485 RECEIVER
DC Characteristics
Differential Input Threshold
-0.2
Input Hysteresis
Output Voltage High
VCC-0.4
Output Voltage Low
Three-State (High Impedance)
Output Current
Input Resistance
12
Input Current (A, B); VIN = 12V
Input Current (A, B); VIN = -7V
Short-Circuit Current
7
10/15/02
TYP.
Mbps
20
0.4
+1
15
1.0
-0.8
60
µA
kΩ
mA
mA
mA
CONDITIONS
-7V ≤ VO ≤ +12V
-7V ≤ VO ≤ +12V
RE = VCC, DE = VCC
-7V ≤ VCM ≤ +12V
VCM = 0V
VID = +200mV, -1.5mA
VID = -200mV, 2.5mA
0V ≤ VO ≤ VCC; RE = VCC
-7V ≤ VCM ≤ +12V
DE = 0V, VCC = 0V or 3.6V, VIN = 12V
DE = 0V, VCC = 0V or 3.6V, VIN = -7V
0V ≤ VCM ≤ VCC
SP3481/3485 Low Power Half-Duplex RS485 Transceivers
2
© Copyright 2000 Sipex Corporation
SPECIFICATIONS (continued)
TAMB = TMIN to TMAX and VCC = +3.3V ± 5% unless otherwise noted.
PARAMETERS
SP3481/SP3485 RECEIVER
MIN.
TYP.
MAX.
UNITS
AC Characteristics
Maximum Data Rate
Receiver Input to Output, tPLH
10
40
70
100
70
Mbps
ns
ns
RE = 0V, DE = 0V
Figures 6 and 11
TAMB = +25oC, VCC = +3.3V,
Figures 6 and 11
Receiver Input to Output, tPHL
40
70
100
70
ns
ns
Figures 6 and 11
TAMB = +25oC, VCC = +3.3V,
Figures 6 and 11
ns
tRSKEW = tRPHL - tRPLH, Figures 6 and 11
Differential Receiver Skew
Receiver Enable to
Output Low
Receiver Enable to
Output High
Receiver Disable from Low
Receiver Disable from High
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
POWER REQUIREMENTS
Supply Current
SP3481/3485
No Load
SP3481
Shutdown Mode
10/15/02
4
50
CONDITIONS
35
60
ns
Figures 7 and 12; S1 closed, S2 open
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
75
200
ns
RE = 3.3V, DE = 0V
65
150
ns
Figures 4 and 10
65
150
ns
Figures 5 and 10
50
200
ns
Figures 7 and 12; S2 closed, S1 open
50
200
ns
Figures 7 and 12; S1 closed, S2 open
1000
800
2000
1500
µA
µA
RE, DI = 0V or VCC; DE = VCC
RE = 0V, DI = 0V or VCC; DE = 0V
10
µA
DE = 0V, RE=VCC
SP3481/3485 Low Power Half-Duplex RS485 Transceivers
3
© Copyright 2002 Sipex Corporation
PIN FUNCTION
R
8
VCC
RE 2
7
B
DE 3
6
A
5
GND
RO 1
Pin 1 – RO – Receiver Output.
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
DI 4
SP485
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, a logic HIGH on RE (pin 2) will disable
the receiver.
Drivers
The receivers of the SP3481 and SP3485 operate
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
The SP3481 is equipped with a Shutdown mode.
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 I SC
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
4
© Copyright 2000 Sipex Corporation
VDM
R
RL = 27Ω
S1
VOD
D
D
GENERATOR
(NOTE 1)
R
VOC
VCC
OUT
50Ω
CL = 15pF
(NOTE 2)
VCC
VOM = VOH + VOL
2
Figure 1. Driver DC Test Load Circuit
1.5V
Figure 2. Driver Propagation Delay Test Circuit
S1
D
CL
RL =
60Ω
D
GENERATOR
(NOTE 1)
OUT
OUT
RL = 110Ω
CL = 50pF
(NOTE 2)
GENERATOR
(NOTE 1)
50Ω
VCC
50Ω
CL = 15pF (NOTE 2)
VOM = VOH + VOL
2
1.5V
Figure 4. Driver Enable and Disable Timing Circuit,
Output HIGH
Figure 3. Driver Differential Output Delay and Transition
Time Circuit
VCC
RL = 110Ω
VID
S1
0V OR 3V
D
GENERATOR
(NOTE 1)
OUT
R
OUT
50Ω
CL = 15pF
(NOTE 2)
CL = 50pF
(NOTE 2)
GENERATOR
(NOTE 1)
50Ω
1.5V
VOM = VCC
2
0V
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
RE
X
X
X
DE
1
1
0
OUTPUTS
LINE
DI CONDITION
1
No Fault
0
No Fault
X
X
B
0
1
Z
INPUTS
RE
DE
0
0
0
0
0
0
1
0
A
1
0
Z
Table 1. Transmit Function Truth Table
10/15/02
OUTPUTS
A-B
R
+0.2V
1
-0.2V
0
Inputs Open
1
X
Z
Table 2. Receive Function Truth Table
SP3481/3485 Low Power Half-Duplex RS485 Transceivers
5
© Copyright 2002 Sipex Corporation
3V
1.5V
1.5V
INPUT
3V
0V
VOH
tPLH
IN
tPHL
1.5V
1.5V
0V
VOM
VOM
Y OUTPUT
tDO1
tDO2
VOL
tPHL
tPLH
VOH
Z OUTPUT
2.0V
90%
OUT
VOM
VOM
90%
50%
10%
50%
10%
-2.0V
VOL
tTD
tTD
VOM = VOH + VOL ≈ 1.5V
2
Figure 8. Driver Propagation Delay Waveforms
Figure 9. Driver Differential Output Delay and Transition
Time Waveforms
3V
1.5V
1.5V
DE
0V
VOH
OUTPUT
HIGH
3V
tPHZ
tPZH
INPUT
0.25V
VOM
0V
VCC
1.5V
1.5V
tRPLH
tRPHL
0V
VCC
tPZL
OUTPUT
LOW
OUTPUT
tPLZ
VOM
VOM = VCC
2
0.25V
VOL
VOM
VOM
0V
VOM = VOH + VOL ≈ 1.5V
2
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
RE
0V
0V
tPRHZ
VOH
OUTPUT
1.5V
1.5V
RE
tPRZH
tPRSH
tPRLZ
tPRZL
tPRSL
VCC
10%
1.5V
1.5V
OUTPUT
VOL
0V
10%
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
6
© Copyright 2000 Sipex Corporation
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
e = 0.100 BSC
(2.540 BSC)
B1
B
Ø
L
eA = 0.300 BSC
(7.620 BSC)
ALTERNATE
END PINS
(BOTH ENDS)
DIMENSIONS (Inches)
Minimum/Maximum
(mm)
10/15/02
8–PIN
A2
0.115/0.195
(2.921/4.953)
B
0.014/0.022
(0.356/0.559)
B1
0.045/0.070
(1.143/1.778)
C
0.008/0.014
(0.203/0.356)
D
0.355/0.400
(9.017/10.160)
E
0.300/0.325
(7.620/8.255)
E1
0.240/0.280
(6.096/7.112)
L
0.115/0.150
(2.921/3.810)
Ø
0°/ 15°
(0°/15°)
SP3481/3485 Low Power Half-Duplex RS485 Transceivers
7
© Copyright 2002 Sipex Corporation
PACKAGE: PLASTIC
SMALL OUTLINE (SOIC)
(NARROW)
E
H
h x 45°
D
A
Ø
e
B
A1
L
DIMENSIONS (Inches)
Minimum/Maximum
(mm)
10/15/02
8–PIN
A
0.053/0.069
(1.346/1.748)
A1
0.004/0.010
(0.102/0.249
B
0.014/0.019
(0.35/0.49)
D
0.189/0.197
(4.80/5.00)
E
0.150/0.157
(3.802/3.988)
e
0.050 BSC
(1.270 BSC)
H
0.228/0.244
(5.801/6.198)
h
0.010/0.020
(0.254/0.498)
L
0.016/0.050
(0.406/1.270)
Ø
0°/8°
(0°/8°)
SP3481/3485 Low Power Half-Duplex RS485 Transceivers
8
© Copyright 2000 Sipex Corporation
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.
Corporation
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: [email protected]
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
9
© Copyright 2002 Sipex Corporation