MAX3157CAI+T Maxim Integrated Products, MAX3157CAI+T Datasheet

TXRX RS485 HIGH CMRR 28SSOP

MAX3157CAI+T

Manufacturer Part Number
MAX3157CAI+T
Description
TXRX RS485 HIGH CMRR 28SSOP
Manufacturer
Maxim Integrated Products
Type
Transceiverr
Datasheet
1.MAX3157CAI.pdf (13 pages)

Specifications of MAX3157CAI+T

Number Of Drivers/receivers
1/1
Protocol
RS422, RS485
Voltage - Supply
4.75 V ~ 5.25 V
Mounting Type
Surface Mount
Package / Case
28-SSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX3157 is a high CMRR RS-485/RS-422 data-com-
munications interface providing ±50V isolation in a
hybrid microcircuit. A single +5V supply on the logic side
powers both sides of the interface, with external ±50V
capacitors transferring power from the logic side to the
isolated side. Each MAX3157 contains one transmitter
and one receiver and is guaranteed to operate at data
rates up to 250kbps. Drivers are short-circuit current lim-
ited and protected against excessive power dissipation
by thermal shutdown circuitry that places the driver out-
puts into a high-impedance state. The receiver input has
a fail-safe feature that guarantees a logic high receiver
output if the inputs are open, shorted, or connected to a
terminated transmission line with all drivers disabled.
The MAX3157 typically draws 25mA of supply current
when unloaded or when fully loaded with the driver dis-
abled. Supply current drops to 25µA when the device is
placed in shutdown mode. The device is pin selectable
between half- and full-duplex mode and also features
independently programmable receiver and transmitter
output phase through separate pins. The MAX3157 is a
low-cost replacement for opto-isolated transceivers. For
fully isolated RS-485/RS-422 transceivers, refer to the
MAX1480 family data sheet.
19-1778; Rev 3; 11/01
________________________Applications
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Industrial Controls
Level Translators
Telecommunications
Local Area Networks
0.1µF
V
CC
________________________________________________________________ Maxim Integrated Products
MICRO
General Description
TXP
RXP
DE
DI
RE
RO
GND
H/F
C1LO
V
CC
C1
0.047µF
C1HI C2LO C2HI
MAX3157
High CMRR RS-485 Transceiver
C2
0.047µF
ISOCOM
ISOV
CC
YR
ZR
AR
BR
A
B
Y
Z
10nF
C4
o ±50V Isolated Data Interface
o +5V Single Supply
o Low-Cost Replacement for Opto-Isolated
o True Fail-Safe Receiver While Maintaining
o Pin-Selectable Full/Half-Duplex Operation
o Phase Controls to Correct for Twisted-Pair
o 25µA Low-Power Shutdown Mode
o Thermal Shutdown for Driver Overload Protection
o 28-Pin SSOP Package
o Slew Rate Limited Reduced EMI
Pin Configurations appear at end of data sheet.
MAX3157CAI
MAX3157EAI
MAX3157CPI
MAX3157EPI
Transceivers
EIA/TIA-485 Compliance
Reversal
PART
C3
1µF
with ±50V Isolation
RG
GND OFFSET
RT = 100Ω
±50V
Typical Operating Circuit
-40°C to +85°C
-40°C to +85°C
TEMP. RANGE
Ordering Information
0°C to +70°C
0°C to +70°C
REMOTE GND
RS-485
NODE
PIN-PACKAGE
28 SSOP
28 SSOP
28 PDIP
28 PDIP
Features
1

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MAX3157CAI+T Summary of contents

Page 1

... RXP MICRO GND C1LO ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. High CMRR RS-485 Transceiver o ±50V Isolated Data Interface o +5V Single Supply o Low-Cost Replacement for Opto-Isolated Transceivers o True Fail-Safe Receiver While Maintaining ...

Page 2

High CMRR RS-485 Transceiver with ±50V Isolation ABSOLUTE MAXIMUM RATINGS All voltages referenced to GND unless otherwise noted. Supply Voltage (V ).............................................................+7V CC Cable Ground (ISOCOM) ....................................................±75V Isolated Supply ISOVCC Relative to Cable Ground (ISOCOM) ............................................................................+7V Digital Input, Output Voltage ...

Page 3

ELECTRICAL CHARACTERISTICS (continued +5V ±5 ISOCOM 0.047µ 1µ Typical values are +5V and PARAMETER ...

Page 4

High CMRR RS-485 Transceiver with ±50V Isolation SWITCHING CHARACTERISTICS (continued +5V ±5 ISOCOM 0.047µ 1µF. Typical values are PARAMETER ...

Page 5

ISOCOM 0.047µ 1µ 10nF SUPPLY CURRENT vs. TEMPERATURE 160 140 120 R = 54Ω L 100 ...

Page 6

High CMRR RS-485 Transceiver with ±50V Isolation (V = +5V ISOCOM 0.047µ 1µ 10nF DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs. TEMPERATURE 1.98 R ...

Page 7

ISOCOM 0.047µ 1µ 10nF POWER-UP DELAY (V ISOCOM 0 +50V 100µs/div Figure 1. ...

Page 8

High CMRR RS-485 Transceiver with ±50V Isolation DPLH DPHL 1 ( (Z) DIFF DIFF 90 ...

Page 9

PIN NAME SSOP PDIP Receiver Output. When RE is low and > -50mV, RO will be high ≤ -200mV will be low. RE Receiver Output Enable. Drive RE low ...

Page 10

High CMRR RS-485 Transceiver with ±50V Isolation Detailed Description The MAX3157 is a high CMRR RS-485/RS-422 data- communications interface providing ±50V isolation in a hybrid microcircuit. A single +5V supply on the logic side powers both sides of the interface, ...

Page 11

DI TXP RXP V CC OSC GND and amplitude are also determined by the resistance between the remote ground and the ISOCOM pin. The receiver input resistors will cause the isolated common voltage the ...

Page 12

High CMRR RS-485 Transceiver with ±50V Isolation TOP VIEW C1LO 5 MAX3157 N.C. 6 N.C. 7 C1HI 8 ISOVCC ISOCOM 14 28 SSOP ...

Page 13

... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13 © 2001 Maxim Integrated Products High CMRR RS-485 Transceiver with ± ...

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