MAX3480BEPI Maxim Integrated Products, MAX3480BEPI Datasheet

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MAX3480BEPI

Manufacturer Part Number
MAX3480BEPI
Description
Manufacturer
Maxim Integrated Products
Datasheet

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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 1600V
(1 minute) or 2000V
and outputs meet RS-485/RS-422 specifications.
________________________Applications
19-0453; Rev 0; 1/96
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
_______________General Description
______________Ordering Information
MAX3480ACPI
MAX3480AEPI
MAX3480BCPI
MAX3480BEPI
PART
Isolated RS-485/RS-422 Data Interface
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
Automatic Test Equipment
HVAC/Building Control Networks
TEMP. RANGE PIN-PACKAGE
-40°C to +85°C
-40°C to +85°C
________________________________________________________________ Maxim Integrated Products
0°C to +70°C
0°C to +70°C
RMS
(1 second). Their isolated inputs
28 Plastic DIP
28 Plastic DIP
28 Plastic DIP
28 Plastic DIP
RS-485/RS-422 Data Interface
DATA
(kbps)
RATE
2500
2500
250
250
RMS
Complete, Isolated, 3.3V
____________________________Features
__________________Pin Configuration
Isolated Data Interface to 1600V
Slew-Rate-Limited Data Transmission (MAX3480B)
High-Speed, Isolated, 2.5Mbps RS-485 Interface
(MAX3480A)
-7V to +12V Common-Mode Input Voltage Range
with Respect to Isolated Ground
Single +3.3V Supply
Current Limiting and Thermal Shutdown for
Driver Overload Protection
Standard 28-Pin DIP Package
TOP VIEW
GND1
GND2
V
V
V
V
V
CC2
CC3
CC4
CC5
CC1
SD
RO
D1
D2
DE
FS
DI
10
11
12
13
14
1
2
3
4
5
6
7
8
9
MAX845
ISOLATION BARRIER
DIP
MAX485
MAX487
RMS
28
27
25
23
22
18
17
26
24
21
20
19
16
15
AC1
AC2
ISO V
B
ISO RO DRV
A
ISO DE IN
ISO COM1
ISO DI DRV
ISO DE DRV
ISO COM2
ISO RO LED
ISO DI IN
ISO V
(1 minute)
MAX3480A/B
CC1
CC2
1

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MAX3480BEPI Summary of contents

Page 1

... Plastic DIP MAX3480AEPI -40°C to +85°C 28 Plastic DIP MAX3480BCPI 0°C to +70°C 28 Plastic DIP MAX3480BEPI -40°C to +85°C 28 Plastic DIP ________________________________________________________________ Maxim Integrated Products For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 Complete, Isolated, 3.3V RS-485/RS-422 Data Interface ...

Page 2

Complete, Isolated, 3.3V RS-485/RS-422 Data Interface ABSOLUTE MAXIMUM RATINGS With Respect to GND: Supply Voltage ( CC1, CC2, CC4, CC5 Supply Voltage (V ) ..........................................-0.3V to +7V CC3 Control Input Voltage (SD, FS) ................-0. Receiver ...

Page 3

ELECTRICAL CHARACTERISTICS (continued 3.0V to 3.6V 0V CC1 CC2 CC4 CC5 3.3V and T CC CC1 ...

Page 4

Complete, Isolated, 3.3V RS-485/RS-422 Data Interface SWITCHING CHARACTERISTICS—MAX3480B ( 3.0V to 3.6V 0V CC1 CC2 CC4 CC5 ...

Page 5

Operating Characteristics (V = 3.3V +25°C, unless otherwise noted.) CC_ A DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs. TEMPERATURE 3.0 ´ HIGH OR OPEN 2 2.8 2.7 2.6 2.5 2.4 2.3 2.2 2.1 ...

Page 6

Complete, Isolated, 3.3V RS-485/RS-422 Data Interface ____________________________Typical Operating Characteristics (continued 3.3V +25°C, unless otherwise noted.) CC_ A MAX3480A DRIVER INPUT (AB) AND RECEIVER OUTPUT (RO) ´ DE INPUT, 2V/div A 2V/div B RO, 74HC240, DI, 2V/div ...

Page 7

Description PIN NAME PINS ON THE NON-ISOLATED SIDE 1 V Logic-Side (non-isolated side) +3.3V Supply Voltage Input. Connect to pins 2, 10, and 14. CC1 2 V Logic-Side (non-isolated side) +3.3V Supply Voltage Input. Connect to pins 1, 10, ...

Page 8

Complete, Isolated, 3.3V RS-485/RS-422 Data Interface _________________________________________________Pin Description (continued) PIN NAME PINS ON THE ISOLATED RS-485/RS-422 SIDE ISO RO Isolated Receiver-Output LED Anode (input > 200mV, ISO RO LED will be high < B ...

Page 9

Description The MAX3480A/MAX3480B are electrically isolated, RS-485/RS-422 data-communications interface solu- tions. Transceivers, optocouplers, a power driver, and a transformer are in one standard 28-pin DIP package. Signals and power are internally transported across the isolation barrier (Figure 1). Power ...

Page 10

Complete, Isolated, 3.3V RS-485/RS-422 Data Interface shutdown circuitry that puts 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 driver outputs are enabled ...

Page 11

Circuits Figure 3. Driver DC Test Load Figure 5. Driver Timing Test Load _______________________________________________________Switching Waveforms 0. 0.4V CC ´ PLH B V ...

Page 12

Complete, Isolated, 3.3V RS-485/RS-422 Data Interface __Switching Waveforms (continued 1.5V V OUTPUT OL t PHL INPUT ID Figure 8. Receiver Propagation Delays ____________________Function Tables Table 2. Transmitting INPUTS ...

Page 13

Information The MAX3480A/MAX3480B are designed for bidirection- al data communications on multipoint bus-transmission lines. Figure 9 shows a typical network application cir- cuit. To minimize reflections, terminate the line at both ends with its characteristic impedance, and keep stub ...

Page 14

Complete, Isolated, 3.3V RS-485/RS-422 Data Interface 3. 0.1µF 22µF 6V BOOSTED V+ C3 0.01 F 74HC240 130 DRIVER INPUT 2 ...

Page 15

Table 4. Maxim’s Isolated RS-485 Product Family No. OF PART Tx/Rx MAX1480A 1/1 MAX1480B 1/1 MAX1490A 1/1 MAX1490B 1/1 MAX3480A 1/1 MAX3480B 1/1 ________________________________________________________Package Information ______________________________________________________________________________________ Complete, Isolated, 3.3V RS-485/RS-422 Data Interface ...

Page 16

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 16 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 1996 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products ...

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