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PDF MAX13444E Data sheet ( Hoja de datos )
| Número de pieza | MAX13444E | |
| Descripción | (MAX13442E - MAX13444E) Fail-Safe RS-485/J1708 Transceivers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-3898; Rev 3; 3/11
±15kV ESD-Protected, ±80V Fault-Protected,
Fail-Safe RS-485/J1708 Transceivers
General Description
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.
Applications
RS-422/RS-485
Communications
Telecommunications
Systems
Truck and Trailer
Applications
Industrial Networks
Automotive Applications
HVAC Controls
Features
♦ ±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
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
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX13442EASA+
-40°C to +125°C 8 SO
MAX13443EASA+
-40°C to +125°C 8 SO
MAX13444EASA/V+T -40°C to +125°C 8 SO
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
T = Tape and reel.
Selector Guide
PART
TYPE
DATA RATE
(Mbps)
FAULT
PROTECTION
(V)
LOW-POWER RECEIVER/DRIVER TRANSCEIVERS
SHUTDOWN
ENABLE
ON BUS
HOT SWAP
MAX13442E
MAX13443E
MAX13444E
RS-485
RS-485
J1708
0.25
10
0.25
±80
±60
±80
Yes
Yes
Yes
Yes
Yes
Yes
128 Yes
128 Yes
128 Yes (only RE)
Pin Configurations and Typical Operating Circuits
TOP VIEW
+
RO 1
R
RE 2
DE 3
DI 4 D
8 VCC
7B
6A
5 GND
+
RO 1
R
RE 2
DE 3
DI 4 D
8 VCC
7B
RT
6
A
5 GND
MAX13442E
MAX13443E
B
RT
A
DE
D
R
DI
RO
SO SO
Pin Configurations and Typical Operating Circuits continued at end of data sheet.
RE
________________________________________________________________ Maxim Integrated Products 1
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.
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
www.DataSheet.co.kr
±15kV ESD-Protected, ±80V Fault-Protected,
Fail-Safe RS-485/J1708 Transceivers
SWITCHING CHARACTERISTICS (MAX13443E)
(VCC = +4.75V to +5.25V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Driver Propagation Delay
Driver Differential Propagation Delay
Driver Differential Output
Transition Time
tPLHA,
tPLHB
tDPLH,
tDPHL
RL = 27Ω, CL = 50pF, Figure 3
RL = 54Ω, CL = 50pF, Figure 4
tLH,tHL RL = 54Ω, CL = 50pF, Figure 4
60 ns
60 ns
25 ns
Driver Output Skew
tSKEWAB,
tSKEWBA
RL = 54Ω, CL = 50pF,
tSKEWAB = |tPLHA - tPHLB|,
tSKEWBA = |tPLHB - tPHLA|
10 ns
Differential Driver Output Skew
Maximum Data Rate
Driver Enable Time to Output High
Driver Disable Time from Output High
Driver Enable Time from Shutdown to
Output High
Driver Enable Time to Output Low
Driver Disable Time from Output Low
Driver Enable Time from Shutdown to
Output Low
Driver Time to Shutdown
Receiver Propagation Delay
Receiver Output Skew
Receiver Enable Time to Output High
Receiver Disable Time from Output High
Receiver Wake Time from Shutdown
Receiver Enable Wake Time from
Shutdown
Receiver Disable Time from Output Low
Receiver Time to Shutdown
tDSKEW
fMAX
tPDZH
tPDHZ
RL = 54Ω, CL = 50pF,
tDSKEW = |tDPLH - tDPHL|
RL = 500Ω, CL = 50pF, Figure 5
RL = 500Ω, CL = 50pF, Figure 5
tPDHS RL = 500Ω, CL = 50pF, Figure 5
tPDZL
tPDLZ
RL = 500Ω, CL = 50pF, Figure 6
RL = 500Ω, CL = 50pF, Figure 6
tPDLS RL = 500Ω, CL = 50pF, Figure 6
tSHDN
tRPLH,
tRPHL
tRSKEW
tRPZH
tRPHZ
tRPWAKE
RL = 500Ω, CL = 50pF, Figure 6
CL = 20pF, VID = 2V, VCM = 0V, Figure 7
CL = 20pF, tRSKEW = |tRPLH - tRPHL|
RL = 1kΩ, CL = 20pF, Figure 8
RL = 1kΩ, CL = 20pF, Figure 8
RL = 1kΩ, CL = 20pF, Figure 8
tRPSH RL = 1kΩ, CL = 20pF, Figure 8
tRPLZ
tSHDN
RL = 1kΩ, CL = 20pF, Figure 8
RL = 500Ω, CL = 50pF
10
10 ns
1200
1200
Mbps
ns
ns
4.2 µs
1200
1200
4.2
800
ns
ns
µs
ns
85 ns
15 ns
400 ns
400 ns
4.2 µs
400 ns
400 ns
800 ns
Note 3: ΔVOD and ΔVOC are the changes in VOD and VOC, respectively, when the DI input changes state.
Note 4: The short-circuit output current applies to peak current just before foldback current limiting. The short-circuit foldback out-
put current applies during current limiting to allow a recovery from bus contention.
_______________________________________________________________________________________ 5
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
www.DataSheet.co.kr
±15kV ESD-Protected, ±80V Fault-Protected,
Fail-Safe RS-485/J1708 Transceivers
PIN
MAX13442E
MAX13443E
MAX13444E
11
22
3—
4—
55
66
77
88
—3
—4
NAME
RO
RE
DE
DI
GND
A
B
VCC
DE
TXD
Pin Description
FUNCTION
Receiver Output. If the receiver is enabled and (VA - VB) -50mV,
RO = high; if (VA - VB) -200mV, RO = low.
Receiver Output Enable. Pull RE low to enable RO.
Driver Output Enable. Force DE high to enable driver. Pull DE low
to three-state the driver output. Drive RE high and pull DE low to
enter low-power shutdown mode.
Driver Input. A logic-low on DI forces the noninverting output low
and the inverting output high. A logic-high on
DI forces the noninverting output high and the inverting output
low.
Ground
Noninverting Receiver Input/Driver Output
Inverting Receiver Input/Driver Output
Positive Supply, VCC = +4.75V to +5.25V. For normal operation,
bypass VCC to GND with a 0.1μF ceramic capacitor. For full ESD
protection, bypass VCC to GND with 1μF ceramic capacitor.
Driver Output Enable. Pull DE low to enable the outputs. Force DE
high to three-state the outputs. Drive RE and DE high to enter low-
power shutdown mode.
J1708 Input. A logic-low on TXD forces outputs A and B to the
dominant state. A logic-high on TXD forces outputs A and B to
the recessive state.
______________________________________________________________________________________ 11
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet MAX13444E.PDF ] | |
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