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Burr-Brown Corporation

ISO485 Datasheet Preview

ISO485 Datasheet

Isolated RS-485 DIFFERENTIAL BUS TRANSCEIVER

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® ISO485
ISO485
Isolated RS-485
DIFFERENTIAL BUS TRANSCEIVER
FEATURES
q RS-485 AND RS-422 COMPATIBLE
q 100% TESTED FOR HIGH-VOLTAGE
BREAKDOWN
q RATED 1500Vrms
q SINGLE-WIDE 24-PIN PLASTIC DIP
q EASY TO USE
q LOW POWER: 180mW typ at 5Mbit/s
APPLICATIONS
q MULTIPOINT DATA TRANSMISSION
ON LONG BUS LINES IN NOISY
ENVIRONMENTS
RE
2
R
1
3 VSA
DESCRIPTION
The ISO485 differential, isolated bus transceiver uses
Burr-Brown’s capacitively coupled isolation technol-
ogy to provide high-speed, low cost bus isolation.
The ISO485 is designed for bi-directional data com-
munication on multipoint bus transmission lines and
meets EIA Standard RS-485 as well as EIA Standard
RS-422A requirements.
The ISO485 uses high voltage 0.4pF capacitors in-
stead of the LED and photodetector which are used in
equivalent optocoupler solutions. As a consequence
the part count of the isolated RS-485 channel is
reduced from multiple optocoupler channels, an RS-
485 transceiver chip and supporting circuitry to one
ISO485. The capacitors in the ISO485 provide a high
voltage barrier, 1500Vrms and greatly reduce current
spikes on the power line.
The ISO485 combines a 3-state differential line driver
and a differential-input line receiver both of which
operate from a single 5V power supply. The driver
differential outputs and the receiver differential input/
output bus ports are designed to offer minimum load-
ing to the bus whenever the driver is disabled or
VS = 0V.
15 VSB
A 12
B 13
D
24
DE
23
GND
A
22
11 14
GND
B
TRUTH TABLE
RS-485
DE RE
BUS
00
01
RX
HIGH Z
1 0 HIGH Z
11
TX
International Airport Industrial Park • Mailing Address: PO Box 11400 • Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706
Tel: (520) 746-1111 • Twx: 910-952-1111 • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1994 Burr-Brown Corporation
PDS-1280C
Printed in U.S.A. May, 1995




Burr-Brown Corporation

ISO485 Datasheet Preview

ISO485 Datasheet

Isolated RS-485 DIFFERENTIAL BUS TRANSCEIVER

No Preview Available !

SPECIFICATIONS
At TA = +25°C, VS = 5V, unless otherwise specified.
PARAMETER
DRIVER DC CHARACTERISTICS
Input Voltage
High MIN
Low MAX
Input Current
High-Level
Low-Level
Output Voltage
Differential Output Voltage
Change In Magnitude of Differential
Output Voltage
Common-Mode Output Voltage
Change in Magnitude of Common-Mode
Output Voltage
Output Current
Short-Circuit Output Current (1 sec max)
DRIVER SWITCHING CHARACTERISTICS
Propagation Delay Time,
Low-to-High Level Output
Propagation Delay Time,
High-to-Low Level Output
Input to Output Propagation Delay Skew
Output Rise Time
Output Fall Time
RECEIVER DC CHARACTERISTICS
Differential-Input-Threshold Voltage
High
Low
Hysteresis
High-Level Output Voltage
Low-Level Output Voltage
High-Impedance-State Output Current
Line Input Current
Enable-Input Current
High
Low
Input Resistance
Short-Circuit Output Current
RECEIVER SWITCHING CHARACTERISTICS
Propagation Delay Time,
Low-to-High Level Output
High-to-Low Level Output
Input to Output Propagation Delay Skew
Output Rise Time
Output Fall Time
TRANSCEIVER SPECIFICATIONS
Maximum Data Rate
Propagation Delay Driver to Receiver
Driver Output Enable Time
Driver Output Disable Time
Propagation Delay Receiver to Driver
Receiver Output Enable Time
Receiver Output Disable Time
CONDITION
VIN = 2.4V
VIN = 0.4V
IOUT = 0
IOA – IOB = 0
RLOAD = 100
RLOAD = 54
RLOAD = 54or 100
RLOAD = 54or 100
RLOAD = 54or 100
VOUT = 7V, output disabled
VOUT = –7V, output disabled
VOUT = –7V
VOUT = 0V
VOUT = VS
VOUT = 12V
RLOAD = 54
RLOAD = 54
RLOAD = 54
RLOAD = 54
RLOAD = 54
VOUT = 2.7V, IOUT = –0.4mA
VOUT = 0.5V, IOUT = 8mA
VID = 200mV, IOH = 400µA
VID = 200mV, IOL = 8mA
VOUT = 1.4V
VIN = 12V, other output = 0V
VIN = –7V, other output = 0V
VIH = 2.7V
VIL = 0.4V
1 sec max
VID = –1.5V to 1.5V, CL = 15pF
VID = –1.5V to 1.5V, CL = 15pF
RL = 54
RL = 54
RL = 110
RL = 110
CL = 15pF
CL = 15pF
MIN
0.8
0
1.5
2
1.5
–0.2
2.4
12
20
ISO485P
TYP
2.5
2.5
–250
–150
250
250
10
10
10
70
0.7
–0.6
40
35
30
10
8
8
35
75
155
185
13
110
120
MAX
2
±1
±1
5
5
5
5
±0.5
3
±0.2
1
–0.8
60
60
0.2
0.4
±1
1
1
60
60
200
280
180
185
UNITS
V
V
µA
µA
V
V
V
V
V
V
V
mA
mA
mA
mA
mA
mA
ns
ns
ns
ns
ns
V
V
mV
V
V
µA
mA
mA
µA
µA
k
mA
ns
ns
ns
ns
ns
Mbits/s
ns
ns
ns
ns
ns
ns
®
ISO485
2


Part Number ISO485
Description Isolated RS-485 DIFFERENTIAL BUS TRANSCEIVER
Maker Burr-Brown Corporation
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ISO485 Datasheet PDF






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