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PDF MAX3480B Data sheet ( Hoja de datos )
| Número de pieza | MAX3480B | |
| Descripción | RS-485/RS-422 Data Interface | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-0453; Rev 0; 1/96
Complete, Isolated, 3.3V
RS-485/RS-422 Data Interface
_______________General Description
The MAX3480A/MAX3480B are electrically isolated
RS-485/RS-422 data-communications interfaces.
Transceivers, optocouplers, and a transformer are all
included in one low-cost, 28-pin DIP package. A single
+3.3V supply on the logic side powers both sides of the
interface.
The MAX3480B features reduced-slew-rate drivers that
minimize EMI and reduce reflections caused by
improperly terminated cables, allowing error-free data
transmission at data rates up to 250kbps. The
MAX3480A’s driver slew rate is not limited, allowing
transmission rates up to 2.5Mbps.
These devices typically draw 180mA of quiescent sup-
ply current. The MAX3480B provides a low-power shut-
down mode in which it consumes only 0.2µA.
Drivers are short-circuit current limited and are protect-
ed against excessive power dissipation by thermal
shutdown circuitry that places the driver outputs into a
high-impedance state. The receiver input has a fail-safe
feature that guarantees a logic-high output if the input
is open circuit.
The MAX3480A/MAX3480B typically withstand 1600VRMS
(1 minute) or 2000VRMS (1 second). Their isolated inputs
and outputs meet RS-485/RS-422 specifications.
________________________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
______________Ordering Information
PART
MAX3480ACPI
MAX3480AEPI
MAX3480BCPI
MAX3480BEPI
TEMP. RANGE PIN-PACKAGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
28 Plastic DIP
28 Plastic DIP
28 Plastic DIP
28 Plastic DIP
DATA
RATE
(kbps)
2500
2500
250
250
____________________________Features
o Isolated Data Interface to 1600VRMS (1 minute)
o Slew-Rate-Limited Data Transmission (MAX3480B)
o High-Speed, Isolated, 2.5Mbps RS-485 Interface
(MAX3480A)
o -7V to +12V Common-Mode Input Voltage Range
with Respect to Isolated Ground
o Single +3.3V Supply
o Current Limiting and Thermal Shutdown for
Driver Overload Protection
o Standard 28-Pin DIP Package
__________________Pin Configuration
TOP VIEW
VCC1 1
VCC2 2
D1 3
D2 4
GND1 5
FS 6
MAX845
SD 7
VCC3 8
DI 9
VCC4 10
DE 11
GND2 12
RO 13
VCC5 14
MAX3480A/B
MAX485
MAX487
28 AC1
27 AC2
26 ISO VCC1
25 B
24 ISO RO DRV
23 A
22 ISO DI IN
21 ISO DE IN
20 ISO COM1
19 ISO DI DRV
18 ISO VCC2
17 ISO DE DRV
16 ISO COM2
15 ISO RO LED
ISOLATION BARRIER
DIP
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
1 page  
Complete, Isolated, 3.3V
RS-485/RS-422 Data Interface
__________________________________________Typical Operating Characteristics
(VCC_ = 3.3V, TA = +25°C, unless otherwise noted.)
DRIVER DIFFERENTIAL OUTPUT VOLTAGE
vs. TEMPERATURE
3.0
DI´ = HIGH OR OPEN
2.9 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
TEMPERATURE (°C)
80
OUTPUT CURRENT
vs. DRIVER OUTPUT HIGH VOLTAGE
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-6 -4 -2 0 2 4
OUTPUT HIGH VOLTAGE (V)
6
OUTPUT CURRENT
vs. DRIVER OUTPUT LOW VOLTAGE
180
160
140
120
100
80
60
40
20
0
0
2 4 6 8 10
OUTPUT LOW VOLTAGE (V)
12
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
TEMPERATURE (°C)
80
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
TEMPERATURE (°C)
80
OUTPUT CURRENT
vs. RECEIVER OUTPUT LOW VOLTAGE
80
MEASURED AT ISO RO DRV
70
60
50
40
30
20
10
0
0
1.0 2.0 3.0 4.0
OUTPUT LOW VOLTAGE (V)
5.0
OUTPUT CURRENT
vs. RECEIVER OUTPUT HIGH VOLTAGE
-30
MEASURED AT ISO RO DRV
-25
-20
-15
-10
-5
0
0
1.0 2.0 3.0 4.0
OUTPUT HIGH VOLTAGE (V)
5.0
_______________________________________________________________________________________ 5
5 Page 
Complete, Isolated, 3.3V
RS-485/RS-422 Data Interface
_________________________________________________________________Test Circuits
A
VOD
B
R
R VOC
ISOLATION BARRIER
3.3V
DE´
A
´DI D VID
B
ISOLATION BARRIER
3.3V
CL1
RDIFF
CL2
A
R
B
R3
RO
Figure 3. Driver DC Test Load
Figure 4. Driver/Receiver Timing Test Circuit
OUTPUT
UNDER TEST
500Ω
CL
ISO VCC1,
S1 ISO VCC2
S2
Figure 5. Driver Timing Test Load
_______________________________________________________Switching Waveforms
VCC_ - 0.4V
´ VCC_ - 0.4V
DI 2
0V
B
A
VDIFF
VO
0V
-VO
VO
1/2 VO
10%
tR
VCC_ - 0.4V
2
tPLH tPHL
1/2 VO
VDIFF = VA - VB
90%
90%
tF
tSKEW = | tPLH - tPHL |
10%
Figure 6. Driver Propagation Delays and Transition Times
VCC_ - 0.4V
´ VCC_ - 0.4V
DE 2
0V
A, B
VOL
A, B
0V
VCC_ - 0.4V
2
tZL tLZ
2.3V OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
2.3V
tZH tHZ
VOL + 0.5V
VOH - 0.5V
Figure 7. Driver Enable and Disable Times
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAX3480B.PDF ] | |
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