SP481REP-L [SIPEX]
Line Transceiver, 1 Func, 1 Driver, 1 Rcvr, BICMOS, PDIP8, LEAD FREE, PLASTIC, MS-001BA, DIP-8;
| 型号： | SP481REP-L |
| 厂家： | 
SIPEX CORPORATION |
| 描述： | Line Transceiver, 1 Func, 1 Driver, 1 Rcvr, BICMOS, PDIP8, LEAD FREE, PLASTIC, MS-001BA, DIP-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9页 (文件大小：73K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
SP481R/SP485R
1/10th Unit Load RS-485Transceiver
FEATURES
■ Allows Over 400 Transceivers On A
Transmission Line (1/10th Unit Load)
■ High Impedance on Receiver Inputs
(RIN = 150kΩ typical)
■ Half-Duplex Configuration Consistent
With Industry Standard Pinout
■ –7V to +12V Common Mode Input
Voltage Range
■ Includes Shutdown Mode (ICC < 10µA)
(For SP481R Only)
■ Low Power Consumption (250mW)
■ Separate Driver and Receiver Enable
Now Available in Lead Free Packaging
DESCRIPTION
The SP481R and SP485R are pin-to-pin equivalent with our existing SP485 product and contain
enhancements such as higher ESD tolerance and high receiver input impedance. The higher
receiver input impedance allows for connecting over 400 transceivers on a single transmission
line without degrading the RS-485 driver signal. Each device is packaged in an 8-pin plastic DIP
or8-pinnarrowSOICpackage. The SP481Roffersashutdownfeatureviatheenablepinswhich
will reduce the supply current (ICC) below 0.5µA typical.
TYPICAL APPLICATION CIRCUIT
RO
RE
DE
DI
1
2
3
4
8
7
6
5
V
B
A
R
CC
D
GND
SP485
Top View
Date: 6/21/04
SP485R RS-485 Serial Transceiver
© Copyright 2004 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...........................................................................+7V
StorageTemperature..........................-65˚Cto+150˚C
Power Dissipation
Package Derating:
8-pin Plastic DIP
øJA....................................................62°C/W
8-pin Plastic N-SOIC
øJA....................................................62°C/W
8-pin Plastic DIP...........................1000mW
8-pinPlasticN-SOIC.......................1000mW
ELECTRICAL CHARACTERISTICS
Typically 25°C @ Vcc = +5V unless otherwise noted.
MIN.
TYP.
MAX.
UNITS
CONDITIONS
LOGIC INPUTS
VIL
VIH
0.8
Volts
Volts
2.0
LOGIC OUTPUTS
VOL
VOH
0.4
0.8
Volts
Volts
IOUT= -3.2mA
IOUT= 1.0mA
2.4
RS-485 DRIVER
DC Characteristics
TTL Input Levels
VIL
Volts
Volts
VIH
2.0
1.5
28.0
5
Outputs
Open Circuit Voltage
Differential Output
Balance
6.0
5.0
±0.2
3.0
Volts
Volts
Volts
Volts
mA
RL=54Ω, CL=50pF
|VT| - |VT|
Common-Mode Output
Output Current
Short Circuit Current
AC Characteristics
Maximum Data Rate
Output Transition Time
Propagation Delay
tPHL
RL=54Ω
Terminated in –7V to +12V
±250
mA
Mbps
ns
RL=54Ω
30
Rise/fall time, 10%–90%
See Figures 3 and 5
RDIFF=54Ω, CL1=CL2=100pF
RDIFF=54Ω, CL1=CL2=100pF
see Figure 3 and 5,
60
60
5
100
100
15
ns
ns
ns
tPLH
Driver Output Skew
tSKEW = | tDPLH - tDPHL
|
RS-485 RECEIVER
DC Characteristics
TTL Output Levels
VOL
0.4
Volts
Volts
µA
VOH
2.4
Tri-State Output Current
Inputs
±1
0.4V≤VOUT ≤2.4V; RE = VCC
Common Mode Range
Receiver Sensitivity
Input Impedance
–7.0
120
+12.0
±0.2
Volts
Volts
kΩ
–7V ≤ VCM ≤ +12V
–7V ≤ VCM ≤ +12V
150
Date: 6/21/04
SP485R RS-485 Serial Transceiver
© Copyright 2004 Sipex Corporation
2
ELECTRICAL CHARACTERISTICS
Typically 25°C @ Vcc = +5V unless otherwise noted.
MIN.
TYP.
MAX.
UNITS
CONDITIONS
AC Characteristics
Maximum Data Rate
Propagation Delay
tPHL
1
Mbps
See Figures 3 and 7
1200
1200
ns
ns
ns
RDIFF=54Ω, CL1=CL2=100pF
RDIFF=54Ω, CL1=CL2=100pF
| tPLH – tPHL |; RDIFF=54Ω,
CL1=CL2=100pF, see Figures 3 and 7
tPLH
Differential Receiver Skew
60
SHUTDOWN TIMING (SP481R)
Time to Shutdown
RS-485 Driver
50
600
ns
RE = VCC, DE = 0V
Enable Time
See Figures 4 and 6
CL=15pF, S1 Closed
CL=15pF, S2 Closed
See Figures 4 and 6
CL=15pF, S1 Closed
CL=15pF, S2 Closed
Enable to Low
Enable to High
Disable Time
Disable From Low
Disable From High
RS-485 Receiver
Enable Time
Enable to Low
Enable to High
Disable Time
40
40
500
500
ns
ns
40
40
500
500
ns
ns
See Figures 2 and 8
CL=15pF, S1 Closed
CL=15pF, S2 Closed
See Figures 2 and 8
CL=15pF, S1 Closed
CL=15pF, S2 Closed
40
40
500
500
ns
ns
Disable From Low
Disable From High
40
40
500
500
ns
ns
POWER REQUIREMENTS
Supply Voltage VCC
Supply Current ICC
No Load
No Load
Supply Current in Shutdown
+4.75
+5.25
Volts
300
500
0.5
500
900
10
µA
µA
µA
RE = VCC or 0V, DE = 0V
RE = VCC or 0V, DE = VCC
RE = VCC, DE = OV
ENVIRONMENTAL
Operating Temperature
Commercial (..C..)
Industrial (..E..)
0
–40
–65
+70
+85
+150
°C
°C
°C
Storage Temperature
RECEIVER INPUT GRAPH
SP485R Reciever
Standard SP485R Reciever
+1.0mA
+100µA
-7V
-3V
-7V
-3V
+12V
+6V
+12V
+6V
-60µA
-0.6 mA
1/10 Unit Load
1 Unit Load
Maximum Input Current
versus voltage.
Maximum Input Current
versus voltage.
(Shaded region)
(Shaded region)
Date: 6/21/04
SP485R RS-485 Serial Transceiver
© Copyright 2004 Sipex Corporation
3
TEST CIRCUITS
A
1kΩ
Test Point
Receiver
Output
R
R
V
CC
S
S
1
2
C
1kΩ
V
RL
OD
V
OC
B
Figure 1. Driver DC Test Load Circuit
Figure 2. Receiver Timing Test Load Circuit
C
C
L1
V
CC
A
B
S
1
A
B
DI
R
L
500Ω
RO
Output
Under
Test
L2
C
L
15pF
S
2
Figure 4. Driver Timing Test Load #2 Circuit
Figure 3. Driver/Receiver Timing Test Circuit
SWITCHING WAVEFORMS
f = 1MHz; t < 10ns; t < 10ns
R
F
+3V
DI
1.5V
1.5V
0V
t
t
t
PLLHH
PLLHH
PHHLL
B
1/2V
1/2V
O
O
DDRIVER
OUTPUT
V
O
A
+
t
t
DPPHHLL
DPLH
DDIFFERENTIAL
OUTPUT
V
V
O
0V
–
V
– V
O
A
B
t
t
F
R
t
= | t
- t
|
SKKEEWW
DPLH DPHL
Figure 5. Driver Propagation Delays
Date: 6/21/04
SP485R RS-485 Serial Transceiver
© Copyright 2004 Sipex Corporation
4
f = 1MHz; t < 10ns; t < 10ns
R
F
+3V
0V
1.5V
1.5V
DE
t
t
LZ
ZL
5V
2.3V
A, B
Output normally LOW
Output normally HIGH
0.5V
0.5V
V
OL
V
OH
A, B
2.3V
0V
t
t
HZ
ZH
Figure 6. Driver Enable and Disable Times
f = 1MHz; t < 10ns; t < 10ns
R
F
+
–
V
V
0D2
0V
0V
A – B
INPUT
0D2
V
OH
1.5V
1.5V
RECEIVER OUT
OUTPUT
V
OL
t
t
PLH
PHL
t
= | t
- t
|
SKEW
PHL PLH
Figure 7. Receiver Propagation Delays
+3V
RE
0V
1.5V
1.5V
f = 1MHz; tR < 10ns; tF < 10ns
tZL
tLZ
5V
RECEIVER OUT
VIL
1.5V
Output normally LOW
Output normally HIGH
0.5V
VIH
0.5V
tHZ
RECEIVER OUT
0V
1.5V
tZH
Figure 8. Receiver Enable and Disable Times
Date: 6/21/04
SP485R RS-485 Serial Transceiver
© Copyright 2004 Sipex Corporation
5
GENERAL DESCRIPTION
with the two 125Ω cable termination resistors
on each end.
The SP485R is a low power RS-485 differential
transceiver. Similar to the SP485, the SP485R
contains a half-duplex driver and receiver with
tri-state control. However, the SP485R is in-
tended for increased connections on a single bus
compared to the orignal RS-485 specification.
The receiver contains a enable pin (RE) which
enables the receiver when a logic LOW is
asserted. A logic HIGH will tri-state the
receiver output and the inputs will maintain
at least 120kΩ impedance. The receiver can
operate to at least 1Mbps.
The RS-485 standard is ideal for multi-drop
applications where one bus can contain many
drivers and/or receivers. The RS-485 standard
implementation allows up to 32 transceivers to
be connected on to the data bus. RS-485 is also
specified for driving higher speeds over long
cable lengths of up to 4,000 feet. The SP485R
and SP481R exceed the standard b allowing up
to 400 receivers to share a bus.
The receiver also contains a fail-safe feature
which outputs a logic HIGH when the inputs are
open as in a disconnected cable.
SHUTDOWN MODE
The SP481R includes a shutdown function to
reduce power consumption. The shutdown is
activated by simultaneously applying a logic
LOW to DE and a logic HIGH to RE. While in
the shutdown mode, the power supply current is
typically less than 1µA. The driver outputs are
disabled and are at a high impedance state
determined by the receiver input impedance
which should be at least 120kΩ. The receiver
output is at also at high impedance during
shutdow. Output leakage current when the
receiver is disabled is under 1µA.
DRIVERS
The driver output complies with the RS-485
electrical characteristics as specified by the
standard. Theoutputswingsfrom0VtoVCC and
maintains greater than +1.5V with a 54Ω load
attached between the two outputs. In adhering
to the RS-485 specification, the driver outputs
inherently comply with the RS-422 standard.
With a load of 100Ω between the two outputs,
the driver can sustain at least +2.0V.
The driver contains an enable pin (DE) which
tri-states the output when DE is a logic LOW.
The outputs during the tri-stated condition are
at a high impedance (>100kΩ). A logic HIGH
enables the driver for normal operation. The
driver can operate to at least 5Mbps
.
RECEIVERS
The SP485R receiver has differential inputs
with an input sensitivity of lower than ±200mV.
As mentioned above, the RS-485 specification
allows up to 32 transceivers on a the same bus.
The SP485R allows over 400 transceivers on
the same bus due to the high input impedance of
at least 120kΩ. This higher capacity allows
more components to be attached to the same
bus without degrading the signal quality. The
drivers are still able to drive an equivalent 54Ω
from the 320 transceivers with an input
impedance of at least 120kΩ in parallel along
Date: 6/21/04
SP485R RS-485 Serial Transceiver
© Copyright 2004 Sipex Corporation
6
PACKAGE: 8 PIN PDIP
N
1
E
INDEX
AREA
E
E1
2
3
N/2
c
eA
eB
A1
D
e
A
A2
D1
L
b2
b
b3
8 PIN PDIP
JEDEC MS-001
(BA) Variation
Dimensions in inches
MIN NOM MAX
A
-
-
.210
-
.015
-
A1
A2
b
.115
.130 .195
.022
b
.014 .018
b2
b3
.045
.030
.060 .070
.039 .045
c
c
D
.008
.355
.005
.010
.365
-
.014
.400
-
D1
E
.325
.280
.310
.250
.300
8 PIN PDIP
E1
e
.240
.100 BSC
.300 BSC
-
eA
-
eB
L
.430
.115
.130 .150
Date: 6/21/04
SP485R RS-485 Serial Transceiver
© Copyright 2004 Sipex Corporation
7
PACKAGE: 8 PIN NSOIC
D
e
E/2
E1
E
E1/2
SEE VIEW C
1
b
INDEX AREA
(D/2 X E1/2)
Ø1
A
TOP VIEW
Gauge Plane
L2
Ø
Ø1
Seating Plane
L
L1
VIEW C
A2
A
SEATING PLANE
A1
SIDE VIEW
b
WITH PLATING
DIMENSIONS
Minimum/Maximum
(mm)
8 Pin NSOIC
(JEDEC MS-012,
AA - VARIATION)
COMMON HEIGHT DIMENSION
SYMBOL
MIN NOM MAX
c
1.75
0.25
1.65
0.51
0.25
A
1.35
-
-
-
-
-
A1
A2
b
0.10
1.25
0.31
c
0.17
BASE METAL
D
E
E1
e
4.90 BSC
6.00 BSC
3.90 BSC
1.27 BSC
CONTACT AREA
L
0.40
-
1.27
L1
L2
1.04 REF
0.25 BSC
0º
5º
-
-
8º
Ø
Ø1
PACKAGE:
8 PIN NSOIC
15º
Date: 6/21/04
SP485R RS-485 Serial Transceiver
© Copyright 2004 Sipex Corporation
8
ORDERING INFORMATION
Part Number
Temperature Range
Package Types
SP481RCP ........................................................................ 0°C to +70°C ................................................................................................ 8 Pin PDIP
SP481RCN ........................................................................ 0°C to +70°C ............................................................................................. 8 Pin NSOIC
SP481RCN/TR .................................................................. 0°C to +70°C ............................................................................................. 8 Pin NSOIC
SP481REP ..................................................................... -40°C to +85°C ................................................................................................ 8 Pin PDIP
SP481REN ..................................................................... -40°C to +85°C ............................................................................................. 8 Pin NSOIC
SP481REN/TR ............................................................... -40°C to +85°C ............................................................................................. 8 Pin NSOIC
SP485RCP ........................................................................ 0°C to +70°C ................................................................................................ 8 Pin PDIP
SP485RCN ........................................................................ 0°C to +70°C ................................................................................................ 8 Pin NOIC
SP485RCN/TR .................................................................. 0°C to +70°C ................................................................................................ 8 Pin NOIC
SP485REP ..................................................................... -40°C to +85°C ................................................................................................ 8 Pin PDIP
SP485REN ..................................................................... -40°C to +85°C ................................................................................................ 8 Pin NOIC
SP485REN/TR ............................................................... -40°C to +85°C ................................................................................................ 8 Pin NOIC
Available in lead free packaging. To order add “-L” suffix to part number.
Example: SP485REN/TR = standard; SP485REN-L/TR = lead free
/TR = Tape and Reel
Pack quantity is 2,500 for NSOIC.
REVISION HISTORY
DATE
REVISION
DESCRIPTION
6/21/04
A
Added extended temp range and tape and reel part numbers. Updated
packaging specs.
Corporation
ANALOG EXCELLENCE
Sipex Corporation
Headquarters and
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
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 herein; neither does it convey any license under its patent rights nor the rights of others.
Date: 6/21/04
SP485R RS-485 Serial Transceiver
© Copyright 2004 Sipex Corporation
9
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