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PDF MAX1480 Data sheet ( Hoja de datos )
| Número de pieza | MAX1480 | |
| Descripción | Complete / Isolated RS-485/RS-422 Data Interface | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-0259; Rev 2a; 2/98
Complete, Isolated RS-485/RS-422
Data Interface
_________________General Description
The MAX1480A/MAX1480B/MAX1480C/MAX1490A/
MAX1490B are complete, electrically isolated, RS-485/
RS-422 data-communications interface solutions in a
hybrid microcircuit. Transceivers, optocouplers, and a
transformer provide a complete interface in a standard
DIP package. A single +5V supply on the logic side pow-
ers both sides of the interface.
The MAX1480B/MAX1480C/MAX1490B feature reduced-
slew-rate drivers that minimize EMI and reduce reflec-
tions caused by improperly terminated cables, allowing
error-free data transmission at data rates up to 250kbps.
The MAX1480A/MAX1490A driver slew rate is not limited,
allowing transmission rates up to 2.5Mbps. The
MAX1480A/B/C are designed for half-duplex communi-
cation, while the MAX1490A/B feature full-duplex com-
munication.
Drivers are short-circuit current limited and protected
against excessive power dissipation by thermal shut-
down circuitry that places the driver outputs into a high-
impedance state. The receiver input has a fail-safe
feature that guarantees a known output (RO low for the
MAX1480A/B/C, RO high for the MAX1490A/B/C) if the
input is open circuit.
The MAX1480A/MAX1480B/MAX1480C/MAX1490A/
MAX1490B typically withstand 1600VRMS (1 minute) or
2000VRMS (1 second). Their isolated outputs meet all
RS-485/RS-422 specifications. The MAX1480A/B/C are
available in a 28-pin DIP package, and the MAX1490A/B
are available in a 24-pin DIP package.
_____________________Selection Table
PART
MAX1480A
MAX1480B
MAX1480C
MAX1490A
MAX1490B
HALF/
FULL
DUPLEX
Half
Half
Half
Full
Full
DATA
RATE
(Mbps)
2.5
0.25
0.25
2.5
0.25
SLEW-
RATE
LIMITED
No
Yes
Yes
No
Yes
DRIVER
ENABLE
TIME
(µs)
0.2
35
0.5
—
—
________________________Applications
Isolated RS-485/RS-422 Data Interface
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
Automatic Test Equipment
HVAC/Building Control Networks
____________________________Features
o Isolated Data Interface, Typically to 1600VRMS
(1 minute)
o Slew-Rate Limited for Errorless Data
Transmission (MAX1480B/MAX1480C/MAX1490B)
o High-Speed, Isolated, 2.5Mbps RS-485/RS-422
Interface (MAX1480A/MAX1490A)
o Full-Duplex Data Communication (MAX1490A/B)
o -7V to +12V Common-Mode Input Voltage Range
with Respect to Isolated Ground
o Single +5V Supply
o Current Limiting and Thermal Shutdown for
Driver Overload Protection
o Standard 0.6" DIP Package:
28-Pin DIP (MAX1480A/B/C)
24-Pin DIP (MAX1490A/B)
_______________Ordering Information
PART†
TEMP. RANGE PIN-PACKAGE
MAX1480ACPI
0°C to +70°C 28 Wide Plastic DIP
MAX1480AEPI -40°C to +85°C 28 Wide Plastic DIP
Ordering Information continued at end of data sheet.
† Data rate for “A” parts is up to 2.5Mbps. Data rate for “B” and
“C” parts is up to 250kbps.
__________________Pin Configurations
TOP VIEW
VCC1 1
VCC2 2
D1 3
D2 4
GND1 5
FS 6
SD 7
VCC3 8
DI 9
VCC4 10
RO 11
GND2 12
24 AC1 MAX1490A/B
23 AC2
22 ISO VCC1
21 ISO RO DRV
20 A
19 B
18 Z
17 Y
16 ISO COM1
15 ISO DI DRV
14 ISO VCC2
13 ISO RO LED
ISOLATION BARRIER
DIP
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
1 page  
Complete, Isolated RS-485/RS-422
Data Interface
__________________________________________Typical Operating Characteristics
(VCC_ = 5V, FS = VCC_, TA = +25°C, unless otherwise noted.)
OUTPUT CURRENT vs.
RECEIVER OUTPUT LOW VOLTAGE
80
MEASURED AT ISO RO DRV
70
60
50
40
30
20
10
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
OUTPUT LOW VOLTAGE (V)
RECEIVER OUTPUT LOW VOLTAGE
vs. TEMPERATURE
0.8
MEASURED AT ISO RO DRV
0.7 IRO = 8mA
0.6
0.5
0.4
0.3
0.2
0.1
0
-40
-20
0 20 40 60 80
TEMPERATURE (°C)
DRIVER OUTPUT CURRENT
vs. DIFFERENTIAL OUTPUT VOLTAGE
80
DI´ = HIGH OR OPEN
70
60
50
40
30
20
10
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
DIFFERENTIAL OUTPUT VOLTAGE (V)
OUTPUT CURRENT vs.
RECEIVER OUTPUT HIGH VOLTAGE
-30
MEASURED AT ISO RO DRV
-25
-20
-15
-10
-5
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
OUTPUT HIGH VOLTAGE (V)
OUTPUT CURRENT vs.
DRIVER OUTPUT LOW VOLTAGE
180
160
140
120
100
80
60
40
20
0
0 1 2 3 4 5 6 7 8 9 10 11 12
OUTPUT LOW VOLTAGE (V)
DRIVER DIFFERENTIAL OUTPUT VOLTAGE
vs. TEMPERATURE
3.0
2.9
DI´ = HIGH OR OPEN
RL = 54Ω
2.8
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2.0
-40 -20
0 20 40 60 80
TEMPERATURE (°C)
RECEIVER OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
5.00
MEASURED AT ISO RO DRV
4.75 IRO = 8mA
4.50
4.25
4.00
3.75
3.50
3.25
3.00
-40
-20
0 20 40 60 80
TEMPERATURE (°C)
OUTPUT CURRENT vs.
DRIVER OUTPUT HIGH VOLTAGE
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6
OUTPUT HIGH VOLTAGE (V)
MAX1480B/MAX1480C/MAX1490B
SHUTDOWN CURRENT vs. TEMPERATURE
0.40
SD = VCC_, DI´ = VCC_
0.35 DE´ (MAX1480B/C ONLY) = VCC_
0.30 MEASURED AT VCC1 AND VCC2
0.25
0.20
0.15
0.10
0.05
0
-40
-20
0 20 40 60 80
TEMPERATURE (°C)
_______________________________________________________________________________________ 5
5 Page 
Complete, Isolated RS-485/RS-422
Data Interface
VCC3
Q
FS
OSC
1.07MHz/
T F/F
1.45MHz
Q
MAX845
D1
N
D2
N
SD GND1
ISO DI IN
ISO DE IN
ISO RO DRV
ISO VCC1
MAX1480A: MAX1487
MAX1480B: MAX487
MAX1480C: MAX487
B
D
A
R
RE
VIN
5V
C1
22µF
C2
0.1µF
74HC86
OR EQUIVALENT
DI DRIVER INPUT
DI´
DE DRIVER ENABLE
DE´
RECEIVER OUTPUT
R1
R2
R3
RO
ISO COM1
VCC1 1
VCC2 2
D1 3
D2 4
GND1 5
FS 6
SD 7
VCC3 8
DI 9
VCC4 10
DE 11
GND2 12
RO 13
VCC5
14
MAX1480A/B/C
28 AC1 (MAKE NO CONNECTION)
MAX845
MAX1487
MAX487
27 AC2 (MAKE NO CONNECTION)
26 ISO VCC1
B
25
24 ISO RO DRV
23 A
22 ISO DI IN
R6
21 ISO DE IN
20 ISO COM1
R4
19 ISO DI DRV
18 ISO VCC2
R5
17 ISO DE DRV
16 ISO COM2
15 ISO RO LED
EXTERNAL RS-485/RS-422 WIRING
TERMINATING RESISTOR
(ONE RESISTOR ON EACH END)
TWISTED PAIR
TO OTHER TRANSCEIVERS
B
SHIELD (OPTIONAL)
A TWISTED PAIR
TO OTHER TRANSCEIVERS
SH
SHIELD (OPTIONAL)
RL
RL
R7
100Ω
NOTE: RESISTOR R7 PROTECTS
THE MAX1480A/B/C FROM TRANSIENT
CURRENTS BETWEEN SHIELD AND
TRANSMISSION LINES.
LOGIC GROUND ISOLATION BARRIER
ISOLATED COMMON
Table 1. Pull-Up and LED Drive Resistors
PART
MAX1480A
MAX1480B
MAX1480C
R1 (Ω)
200
200
200
R2 (Ω)
200
510
200
R3 (Ω)
1000
3000
3000
R4 (Ω)
4300
2200
3000
R5 (Ω)
1000
3000
3000
R6 (Ω)
200
200
200
Figure 1. MAX1480A/MAX1480B/MAX1480C Detailed Block Diagram and Typical Application Circuit
The MAX1480A/MAX1480B/MAX1480C/MAX1490A/
MAX1490B typically withstand 1600VRMS (1 minute) or
2000VRMS (1 second). The logic inputs can be driven
from TTL/CMOS-logic with a series resistor, and the
received data output can directly drive TTL or CMOS-
logic families with only resistive pull-up.
Low-Power Shutdown Mode
The SD pin shuts down the oscillator on the internal power
driver. With the primary side in shutdown, no power is
transferred across the isolation barrier. The DI and DE
optocouplers, however, still consume current if the drive
signals on the non-isolated side are low. Therefore, leave
DI´ and DE´ high or floating when in shutdown mode.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet MAX1480.PDF ] | |
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