MAX13442EASA+ Maxim Integrated Products, MAX13442EASA+ Datasheet

IC TXRX RS485 HALF DUPLEX 8-SOIC

MAX13442EASA+

Manufacturer Part Number
MAX13442EASA+
Description
IC TXRX RS485 HALF DUPLEX 8-SOIC
Manufacturer
Maxim Integrated Products
Type
Transceiverr
Datasheet

Specifications of MAX13442EASA+

Number Of Drivers/receivers
1/1
Protocol
RS422, RS485
Voltage - Supply
4.75 V ~ 5.25 V
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX13442E/MAX13444E are fault-protected RS-485
and J1708 transceivers that feature ±80V protection from
signal faults on communication bus lines. The
MAX13442E/MAX13444E feature a reduced slew-rate dri-
ver that minimizes EMI and reflections, allowing error-free
transmission up to 250kbps. The MAX13443E driver can
transmit up to 10Mbps. The high-speed MAX13443E
RS-485 tranceiver features ±60V protection from signal
faults on communication bus lines. These transceivers fea-
ture foldback current limit. Each device contains one dif-
ferential line driver with three-state output and one
differential line receiver with three-state input. The 1/4-unit-
load receiver input impedance allows up to 128 trans-
ceivers on a single bus. The devices operate from a 5V
supply. True fail-safe inputs guarantee a logic-high receiv-
er output when the receiver inputs are open, shorted, or
connected to an idle data line.
Hot-swap circuitry eliminates false transitions on the
data bus during circuit initialization or connection to a
live backplane. Short-circuit current-limiting and ther-
mal-shutdown circuitry protect the driver against exces-
sive power dissipation, and on-chip ±15kV ESD
protection eliminates costly external protection devices.
The MAX13442E/MAX13443E/MAX13444E are avail-
able in an 8-pin SO package and are specified over the
automotive temperature range.
RS-422/RS-485
Communications
Truck and Trailer
Applications
Industrial Networks
19-3898; Rev 3; 3/11
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX13442E
MAX13443E
MAX13444E
Pin Configurations and Typical Operating Circuits continued at end of data sheet.
PART
±15kV ESD-Protected, ±80V Fault-Protected,
TOP VIEW
RS-485
RS-485
J1708
TYPE
________________________________________________________________ Maxim Integrated Products
RO
RE
DE
DI
1
2
3
4
DATA RATE
+
General Description
(Mbps)
D
0.25
0.25
R
10
Fail-Safe RS-485/J1708 Transceivers
SO
Telecommunications
Systems
Automotive Applications
HVAC Controls
Applications
PROTECTION
8
7
6
5
Pin Configurations and Typical Operating Circuits
V
B
A
GND
FAULT
CC
±80
±60
±80
(V)
RO
DE
RE
DI
1
2
3
4
+
LOW-POWER
SHUTDOWN
D
R
SO
Yes
Yes
Yes
♦ ±15kV ESD Protection
♦ ±80V Fault Protection (±60V MAX13443E)
♦ Guaranteed 10Mbps Data Rate (MAX13443E)
♦ Hot-Swappable for Telecom Applications
♦ True Fail-Safe Receiver Inputs
♦ Enhanced Slew-Rate-Limiting Facilitates
♦ Allow Up to 128 Transceivers on the Bus
♦ -7V to +12V Common-Mode Input Range
♦ ±6mA FoldBack Current Limit
♦ Industry-Standard Pinout
+ Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
T = Tape and reel.
MAX13442EASA+
MAX13443EASA+
MAX13444EASA/V+T
7
6
8
5
Error-Free Data Transmission
(MAX13442E/MAX13444E)
B
A
V
GND
RECEIVER/DRIVER
CC
R
T
PART
ENABLE
Yes
Yes
Yes
MAX13442E
MAX13443E
Ordering Information
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
R
TEMP RANGE
T
TRANSCEIVERS
B
A
ON BUS
128
128
128
Selector Guide
R
D
RE
DE
PIN-PACKAGE
8 SO
8 SO
8 SO
Features
DI
RO
Yes (only RE)
HOT SWAP
Yes
Yes
1

Related parts for MAX13442EASA+

MAX13442EASA+ Summary of contents

Page 1

... Error-Free Data Transmission (MAX13442E/MAX13444E) ♦ Allow Up to 128 Transceivers on the Bus ♦ -7V to +12V Common-Mode Input Range ♦ ±6mA FoldBack Current Limit ♦ Industry-Standard Pinout PART MAX13442EASA+ MAX13443EASA+ MAX13444EASA/V+T Applications + Denotes a lead(Pb)-free/RoHS-compliant package. /V denotes an automotive qualified part Tape and reel. ...

Page 2

ESD-Protected, ±80V Fault-Protected, Fail-Safe RS-485/J1708 Transceivers ABSOLUTE MAXIMUM RATINGS (Voltages referenced to GND.) V ........................................................................................+7V CC RE, DE, DE, DI, TXD ...................................-0. (Note 1) (MAX13442E/MAX13444E) ............................±80V A, B (Note 1) (MAX13443E) .................................................±60V RO ..............................................................-0.3V to ...

Page 3

ESD-Protected, ±80V Fault-Protected, Fail-Safe RS-485/J1708 Transceivers DC ELECTRICAL CHARACTERISTICS (continued +4.75V to +5.25V MIN PARAMETER SYMBOL RECEIVER Input Current Receiver-Differential Threshold Voltage Receiver-Input Hysteresis RECEIVER LOGIC Output-High Voltage Output-Low Voltage ...

Page 4

ESD-Protected, ±80V Fault-Protected, Fail-Safe RS-485/J1708 Transceivers PROTECTION SPECIFICATIONS (V = +4.75V to +5.25V MIN PARAMETER SYMBOL Overvoltage Protection ESD Protection SWITCHING CHARACTERISTICS (MAX13442E/MAX13444E +4.75V to +5.25V ...

Page 5

ESD-Protected, ±80V Fault-Protected, Fail-Safe RS-485/J1708 Transceivers SWITCHING CHARACTERISTICS (MAX13443E +4.75V to +5.25V MIN PARAMETER Driver Propagation Delay Driver Differential Propagation Delay Driver Differential Output Transition Time Driver Output Skew Differential ...

Page 6

ESD-Protected, ±80V Fault-Protected, Fail-Safe RS-485/J1708 Transceivers (V = +5V +25°C, unless otherwise noted NO-LOAD SUPPLY CURRENT vs. TEMPERATURE 6 DRIVER AND RECEIVER ENABLED 5 4 DRIVER DISABLED, 3 RECEIVER ENABLED 2 1 MAX13443E 0 -40 ...

Page 7

ESD-Protected, ±80V Fault-Protected, Fail-Safe RS-485/J1708 Transceivers (V = +5V +25°C, unless otherwise noted DRIVER OUTPUT CURRENT vs. DIFFERENTIAL OUTPUT VOLTAGE 100 R = 54Ω MAX13442E DI = GND ...

Page 8

ESD-Protected, ±80V Fault-Protected, Fail-Safe RS-485/J1708 Transceivers Figure 1. Driver V and Figure 2. Receiver V and GENERATOR B (NOTE 5) 50Ω Figure ...

Page 9

ESD-Protected, ±80V Fault-Protected, Fail-Safe RS-485/J1708 Transceivers 50pF L (NOTE 6) GENERATOR (NOTE 5) 50Ω Figure 5. Driver Enable and Disable Times ...

Page 10

ESD-Protected, ±80V Fault-Protected, Fail-Safe RS-485/J1708 Transceivers S3 +1.5V -1.5V GENERATOR (NOTE 5) RE 1.5V t RPZH t RPSH t RPWAKE RO 1.5V RE 1.5V t RPHZ RO 0.5V Figure 8. Receiver Enable and Disable Times Note 5: The input ...

Page 11

ESD-Protected, ±80V Fault-Protected, Fail-Safe RS-485/J1708 Transceivers PIN MAX13442E MAX13444E MAX13443E — 4 — — 3 — 4 ______________________________________________________________________________________ NAME Receiver Output. If the receiver is enabled ...

Page 12

ESD-Protected, ±80V Fault-Protected, Fail-Safe RS-485/J1708 Transceivers Table 1. MAX13442E/MAX13443E (RS-485/RS-422) TRANSMITTING INPUTS Don’t care. Table 2. ...

Page 13

ESD-Protected, ±80V Fault-Protected, Fail-Safe RS-485/J1708 Transceivers Detailed Description The MAX13442E/MAX13443E/MAX13444E fault-protect- ed transceivers for RS-485/RS-422 and J1708 communi- cation contain one driver and one receiver. These devices feature fail-safe circuitry, which guarantees a logic-high receiver output when the receiver ...

Page 14

ESD-Protected, ±80V Fault-Protected, Fail-Safe RS-485/J1708 Transceivers Hot-Swap Capability Inserting circuit boards into a hot, or powered, back- plane may cause voltage transients on DE, RE, and receiver inputs A and B that can lead to data errors. For example, ...

Page 15

ESD-Protected, ±80V Fault-Protected, Fail-Safe RS-485/J1708 Transceivers Applications Information 128 Transceivers on the Bus The MAX13442E/MAX13443E/MAX13444E transceivers 1/4-unit-load receiver input impedance (48kΩ) allows up to 128 transceivers connected in parallel on one communication line. Connect any combination of these devices, ...

Page 16

ESD-Protected, ±80V Fault-Protected, Fail-Safe RS-485/J1708 Transceivers J1708 Applications The MAX13444E is designed for J1708 applications. To configure the MAX13444E, connect DE and RE to GND. Connect the signal to be transmitted to TXD. Terminate the bus with the load ...

Page 17

ESD-Protected, ±80V Fault-Protected, Fail-Safe RS-485/J1708 Transceivers TXD X B MAX13444E Figure 14. J1708 Application Circuit (See Tables 2 and 4) Pin Configurations and Typical Operating Circuits (continued ...

Page 18

... 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. 18 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2011 Maxim Integrated Products ...

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