Maxim MAX3442EEPA Datasheet
Selector Guide
General Description
The MAX3440E–MAX3444E fault-protected RS-485 and
J1708 transceivers feature ±60V protection from signal
faults on communication bus lines. Each device contains
one differential line driver with three-state output and one
differential line receiver with three-state input. The 1/4-unitload receiver input impedance allows up to 128 transceivers on a single bus. The devices operate from a 5V
supply at data rates of up to 10Mbps. True fail-safe inputs
guarantee a logic-high receiver 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 thermal shutdown circuitry protect the driver against excessive power dissipation, and on-chip ±15kV ESD
protection eliminates costly external protection devices.
The MAX3440E–MAX3444E are available in 8-pin SO
and PDIP packages and are specified over industrial
and automotive temperature ranges.
Applications
RS-422/RS-485 Communications
Truck and Trailer Applications
Industrial Networks
Telecommunications Systems
Automotive Applications
HVAC Controls
Features
♦ ±15kV ESD Protection
♦ ±60V Fault Protection
♦ Guaranteed 10Mbps Data Rate
(MAX3441E/MAX3443E)
♦ Hot Swappable for Telecom Applications
♦ True Fail-Safe Receiver Inputs
♦ Enhanced Slew-Rate-Limiting Facilitates
Error-Free Data Transmission
(MAX3440E/MAX3442E/MAX3444E)
♦ Allow Up to 128 Transceivers on the Bus
♦ -7V to +12V Common-Mode Input Range
♦ Automotive Temperature Range (-40°C to +125°C)
♦ Industry-Standard Pinout
MAX3440E–MAX3444E
±15kV ESD-Protected, ±60V Fault-Protected,
10Mbps, Fail-Safe RS-485/J1708 Transceivers
________________________________________________________________ Maxim Integrated Products 1
Pin Configurations and Typical Operating Circuits
Ordering Information
19-2666; Rev 0; 10/02
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.
Ordering Information continued at end of data sheet.
Pin Configurations and Typical Operating Circuits continued at end of data sheet.
PART TEMP RANGE PIN-PACKAGE
MAX3440EESA -40°C to +85°C 8 SO
MAX3440EEPA -40°C to +85°C 8 PDIP
MAX3440EASA -40°C to +125°C 8 SO
MAX3440EAPA -40°C to +125°C 8 PDIP
PART TYPE
MAX3440E RS-485 0.25 No Yes 128 Yes
MAX3441E RS-485 2.5 to 10 No Yes 128 Yes
MAX3442E RS-485 0.25 Yes Yes 128 Yes
MAX3443E RS-485 2.5 to 10 Yes Yes 128 Yes
MAX3444E J1708 0.25 Yes Yes 128 Yes (only RE)
DATA RATE
(Mbps)
LOW-POWER
SHUTDOWN
RECEIVER/DRIVER
ENABLE
TRANSCEIVERS
ON BUS
HOT SWAP
TOP VIEW
MAX3440E
FAULT
1
RO
DE/RE
DI
R
2
3
4
D
DIP/SO DIP/SO
FAULT
DE/RE
1
RO
DI
R
2
3
4
D
8
V
CC
B
7
Rt
6
A
5
GND
V
8
CC
B
7
A
6
GND
5
MAX3441E
B
Rt
A
R
DE/RE
D
FAULT
DI
RO
MAX3440E–MAX3444E
±15kV ESD-Protected, ±60V Fault-Protected,
10Mbps, Fail-Safe RS-485/J1708 Transceivers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Voltages Referenced to GND
V
CC
........................................................................................+7V
FAULT, DE/RE, RE, DE, DE, DI, TXD..........-0.3V to (V
CC
+ 0.3V)
A, B (Note 1) ........................................................................±60V
RO ..............................................................-0.3V to (V
CC
+ 0.3V)
Short-Circuit Duration (RO, A, B) ...............................Continuous
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO (derate 5.9mW/°C above +70°C)..................471mW
8-Pin PDIP (derate 9.09mW/°C above +70°C).............727mW
Operating Temperature Ranges
MAX344_EE_ _ ...............................................-40°C to +85°C
MAX344_EA_ _ .............................................-40°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
DC ELECTRICAL CHARACTERISTICS
(VCC= +4.75V to +5.25V, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at VCC= +5V and TA= +25°C.)
Note 1: A, B must be terminated with 54Ω or 100Ω to guarantee ±60V fault protection.
DRIVER
Differential Driver Output V
Change in Magnitude of
Differential Output Voltage
Driver Common-Mode
Output Voltage
Change in Magnitude of
Common-Mode Voltage
DRIVER LOGIC
Driver Input High Voltage V
Driver Input Low Voltage V
Driver Input Current I
Driver Short-Circuit Output Current
(Note 3)
Driver Short-Circuit Foldback
Output Current
RECEIVER
Input Current I
Receiver Differential Threshold
Voltage
Receiver Input Hysteresis
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Figure 1, RL = 100Ω 2V
OD
Figure 1, RL = 54Ω 1.5 V
∆V
V
∆V
I
OSD
I
OSDF
V
∆
Figure 1, RL = 100Ω or 54Ω (Note 2) 0.2 V
OD
Figure 1, RL = 100Ω or 54Ω V
OC
Figure 1, RL = 100Ω or 54Ω (Note 2) 0.2 V
OC
DIH
DIL
DIN
0 ≤ V
-7V ≤ V
(VCC - 1V) ≤ V
-7V ≤ V
A, B
A,B
-7V ≤ VCM ≤ +12V -200 -50 mV
TH
V
TH
≤ +12V +350
OUT
≤ V
OUT
≤ +1V (Note 3) -25
OUT
VCC = GND, V
V
A, B
V
A, B
CC
CC
/ 2 3 V
CC
2V
0.8 V
±2µA
CC
≤ +12V (Note 3) +25
OUT
= 12V 250
A, B
= -7V -150
= ±60V ±6mA
-350
25 mV
V
mA
mA
µA
MAX3440E–MAX3444E
±15kV ESD-Protected, ±60V Fault-Protected,
10Mbps, Fail-Safe RS-485/J1708 Transceivers
_______________________________________________________________________________________ 3
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC= +4.75V to +5.25V, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at VCC= +5V and TA= +25°C.)
PROTECTION SPECIFICATIONS
(VCC= +4.75V to +5.25V, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at VCC= +5V and TA= +25°C.)
RECEIVER LOGIC
Output High Voltage V
Output Low Voltage V
Three-State Output Current at
Receiver
Receiver Input Resistance R
Receiver Output Short-Circuit
Current
CONTROL
Control Input High Voltage V
Input Current Latch During First
Rising Edge
SUPPLY CURRENT
Normal Operation I
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Figure 2, IOH = -1.6mA VCC - 0.6 V
OH
Figure 2, IOL = 1mA 0.4 V
OL
I
OZR
I
OSR
I
0 ≤ V
-7V ≤ VCM ≤ +12V 48 kΩ
IN
0 ≤ VRO ≤ V
DE, DE, RE, DE/RE 2 V
CIH
DE, DE/RE, RE 90 µA
IN
No load,
DI = V
Q
or GND
≤ V
A, B
CC
CC
MAX3440E (DE/RE = VCC),
MAX3442E (DE = V
RE = GND),
MAX3444E (DE = RE = GND)
CC
MAX3441E (DE/RE = V
MAX3443E (DE = V
RE = GND)
CC
CC
±1µA
±95 mA
,
),
CC
,
30
mA
10
Supply Current in Shutdown Mode I
Supply Current with Output
Shorted to ±60V
SHDN
I
SHRT
DE = GND, RE = VCC (MAX3442E/
MAX3443E)
DE = GND, RE = VCC, TA = +25°C
(MAX3442E/MAX3443E)
DE = RE = VCC (MAX3444E) 100
DE = RE = VCC, TA = +25°C (MAX3444E) 10
DE = GND, RE = GND, no load
output in three-state (MAX3443E)
20
10
±15 mA
Overvoltage Protection A, B; R
ESD Protection A, B Human Body Model ±15 kV
FAULT DETECTION
Receiver Differential Threshold F
Receiver Differential Threshold F
Fault-Detection Common-Mode
Input Voltage Positive
Fault-Detection Common-Mode
Input Voltage Negative
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
= 0, RL = 54Ω±60 V
12 V
DIPHVCM
DIPL
VCM = 0, low limit -450 -270 mV
SOURCE
= 0, high limit 270 450 mV
-7 V
µA
MAX3440E–MAX3444E
±15kV ESD-Protected, ±60V Fault-Protected,
10Mbps, Fail-Safe RS-485/J1708 Transceivers
4 _______________________________________________________________________________________
SWITCHING CHARACTERISTICS (MAX3440E/MAX3442E/MAX3444E)
(VCC= +4.75V to +5.25V, TA= T
MIN
to T
MAX
, 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
t
PLHA,
t
PLHB
t
DPLH,
t
DPHL
t
LH,tHL
MAX3440E/MAX3442E,
Figure 3, R
MAX3444E, R
= 54Ω, CL = 50pF
L
= 60Ω, C
DIFF
DIFF
= 100pF
Figure 4, RL = 54Ω, CL = 50pF 2000 ns
Figure 4, RL = 54Ω, CL = 50pF 200 2000 ns
2000 ns
t
Driver Output Skew
Differential Driver Output Skew t
Maximum Data Rate f
Driver Enable Time to Output High t
Driver Disable Time from Output High t
Driver Enable Time from Shutdown to
Output High
Driver Enable Time to Output Low t
Driver Disable Time from Output Low t
Driver Enable Time from Shutdown to
Output Low
Driver Time to Shutdown t
Receiver Propagation Delay
Receiver Output Skew t
Receiver Enable Time to Output High t
Recei ver D i sab l e Ti m e fr om Outp ut H i g ht
Receiver Wake Time from Shutdown t
Receiver Enable Time to Output Low t
Recei ver D i sab l e Ti m e fr om Outp ut Low t
Receiver Time to Shutdown t
S KEWAB
t
S KEWBA
DSKEW
MAX
PDZH
PDHZ
t
PDHS
PDZL
PDLZ
t
PDLS
SHDN
t
RPLH
t
RPHL
RSKEWCL
RPZH
RPHZ
RPWAKE
RPZL
RPLZ
SHDN
RL = 54Ω, CL = 50pF,
,
t
SKEWAB
t
SKEWBA
RL = 54Ω, CL = 50pF,
t
DSKEW
Figure 5, RL = 500Ω, CL = 50pF 2000 ns
Figure 5, RL = 500Ω, CL = 50pF 2000 ns
Figure 5, RL = 500Ω, CL = 50pF
(MAX3442E/MAX3444E)
Figure 6, RL = 500Ω, CL = 50pF 2000 ns
Figure 6, RL = 500Ω, CL = 50pF 2000 ns
Figure 6, RL = 500Ω, CL = 50pF
(MAX3442E/MAX3444E)
RL = 500Ω, CL = 50p F ( M AX 3442E /M AX 3444E ) 800 ns
,
Figure 7, C
= 20pF, t
Figure 8, RL = 1kΩ, C
Figure 8, RL = 1kΩ, CL = 20pF 2000 ns
Figure 8, RL = 1kΩ, CL = 20pF
(MAX3442E/MAX3444E)
Figure 8, RL = 1kΩ, C
Figure 8, RL = 1kΩ, CL = 20pF 2000 ns
RL = 500Ω, CL= 50pF
(MAX3442E/MAX3444E)
= |t
= |t
= |t
L
- t
PLHA
- t
PLHB
- t
DPLH
= 20pF, V
RSKEW
PHLB
PHLA
DPHL
|,
|
|
350 ns
200 ns
250 kbps
= 2V, VCM = 0 2000 ns
ID
= |t
- t
RPLH
= 20pF 2000 ns
L
= 20pF 2000 ns
L
| 200 ns
RPHL
800 ns
4.2 µs
4.2 µs
4.2 µs
MAX3440E–MAX3444E
±15kV ESD-Protected, ±60V Fault-Protected,
10Mbps, Fail-Safe RS-485/J1708 Transceivers
_______________________________________________________________________________________ 5
SWITCHING CHARACTERISTICS (MAX3441E/MAX3443E)
(VCC= +4.75V to +5.25V, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at VCC= +5V and TA= +25°C.)
Note 2: ∆V
OD
and ∆VOCare the changes in VODand VOC, respectively, when the DI input changes state.
Note 3: The short-circuit output current applies to peak current just before foldback current limiting; the short-circuit foldback output
current applies during current limiting to allow a recovery from bus contention.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Driver Propagation Delay
Driver Differential Propagation Delay
Driver Differential Output
Transition Time
Driver Output Skew
Differential Driver Output Skew t
Maximum Data Rate f
Driver Enable Time to Output High t
Driver Disable Time from Output High t
Driver Enable Time from Shutdown to
Output High
Driver Enable Time to Output Low t
Driver Disable Time from Output Low t
Driver Enable Time from Shutdown to
Output Low
Driver Time to Shutdown t
Receiver Propagation Delay
Receiver Output Skew t
Receiver Enable Time to Output High t
Recei ver D i sab l e Ti m e fr om Outp ut H i g ht
Receiver Wake Time from Shutdown t
Receiver Enable Wake Time from
Shutdown
Recei ver D i sab l e Ti m e fr om Outp ut Low t
Receiver Time to Shutdown t
t
PLHA,
t
PLHB
t
DPLH,
t
DPHL
t
LH,tHL
t
SKEWAB
t
SKEWBA
DSKEW
MAX
PDZH
PDHZ
t
PDHS
PDZL
PDLZ
t
PDLS
SHDN
t
RPLH
t
RPHL
RSKEWCL
RPZH
RPHZ
RPWAKE
t
RPSH
RPLZ
SHDN
Figure 3, RL = 27Ω, CL = 50pF 60 ns
Figure 4, RL = 54Ω, CL = 50pF 60 ns
Figure 4, RL = 54Ω, CL = 50pF 25 ns
RL = 54Ω, CL = 50pF,
,
t
SKEWAB
t
SKEWBA
= |t
= |t
PLHA
PLHB
- t
- t
PHLB
PHLA
|,
|
RL = 54Ω, CL = 50pF,
- t
t
DSKEW
= |t
DPLH
DPHL
|
Figure 5, RL = 500Ω, CL = 50pF 1200 ns
Figure 5, RL = 500Ω, CL = 50pF 1200 ns
Figure 5, RL = 500Ω, CL = 50pF (MAX3443E) 4.2 µs
Figure 6, RL = 500Ω, CL = 50pF 1200 ns
Figure 6, RL = 500Ω, CL = 50pF 1200 ns
Figure 6, RL = 500Ω, CL = 50pF (MAX3443E) 4.2 µs
Fi g ur e 6, RL = 500Ω, C
,
Figure 7, C
L
= 20pF, t
Figure 8, RL = 1kΩ, C
= 20pF, V
RSKEW
= 50p F ( M AX 3443E ) 800 ns
L
= 2V, VCM = 0 85 ns
ID
= |t
- t
RPLH
RPHL
= 20pF 400 ns
L
Figure 8, RL = 1kΩ, CL = 20pF 400 ns
Figure 8, RL = 1kΩ, CL= 20pF (MAX3443E) 4.2 µs
Figure 8, RL = 1kΩ, C
= 20pF 400 ns
L
Figure 8, RL = 1kΩ, CL= 20pF 400 ns
RL = 500Ω, CL= 50pF (MAX3443E) 800 ns
10 ns
10 ns
10 Mbps
|15ns
MAX3440E–MAX3444E
±15kV ESD-Protected, ±60V Fault-Protected,
10Mbps, Fail-Safe RS-485/J1708 Transceivers
6 _______________________________________________________________________________________
Typical Operating Characteristics
(VCC= +5V, TA = +25°C, unless otherwise noted.)
NO-LOAD SUPPLY CURRENT
vs. TEMPERATURE
MAX3440E toc01
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
1109580655035205-10-25
1
2
3
4
5
6
0
-40 125
DRIVER AND RECEIVER
ENABLED
MAX3441E/MAX3443E
DRIVER DISABLED,
RECEIVER ENABLED
NO-LOAD SUPPLY CURRENT
vs. TEMPERATURE
MAX3440E toc02
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
1109580655035205-10-25
4
8
12
16
20
24
0
-40 125
MAX3440E/MAX3442E/MAX3444E
DRIVER AND RECEIVER
ENABLED
DRIVER DISABLED,
RECEIVER ENABLED
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX3443E toc03
TEMPERATURE (°C)
SUPPLY CURRENT (nA)
1109580655035205-10-25
0.1
1
10
0.01
-40 125
MAX3442E/MAX3443E/MAX3444E
A, B CURRENT
vs. A, B VOLTAGE (TO GROUND)
MAX3443E toc09
A, B VOLTAGE (V)
A, B CURRENT (µA)
4030 6050-50
-40
-30 -10 0 10-20 20
-800
-400
-1600
-2000
RL = 54Ω
-1200
0
400
800
1200
1600
2000
-60
DRIVER DISABLED,
RECEIVER ENABLED
RECEIVER OUTPUT CURRENT
vs. OUTPUT LOW VOLTAGE
40
35
30
25
20
15
10
RECEIVER OUTPUT CURRENT (mA)
5
0
0
1.0
OUTPUT LOW VOLTAGE (V)
1.5 2.5 3.0 3.52.0 4.0
5.04.50.5
DRIVER OUTPUT CURRENT
vs. DIFFERENTIAL OUTPUT VOLTAGE
80
70
60
50
40
30
20
DRIVER OUTPUT CURRENT (mA)
10
0
0.5
0
1.0
DIFFERENTIAL OUTPUT VOLTAGE (VA - VB) (V)
1.5 2.5 3.0 3.52.0
MAX3443E toc07
40
MAX3443E toc04
35
30
25
20
15
10
RECEIVER OUTPUT CURRENT (mA)
5
0
0
DIFFERENTIAL OUTPUT VOLTAGE
3.5
3.0
RL = 100Ω
2.5
2.0
1.5
1.0
DIFFERENTIAL OUTPUT VOLTAGE (V)
0.5
MAX3441E/MAX3443E
0
-40 125
RECEIVER OUTPUT CURRENT
vs. OUTPUT HIGH VOLTAGE
1.5 2.5 3.0 3.52.0 4.0
1.0
OUTPUT HIGH VOLTAGE (V)
vs. TEMPERATURE
RL = 54Ω
TEMPERATURE (°C)
RECEIVER OUTPUT VOLTAGE
vs. TEMPERATURE
5.0
4.5
MAX3443E toc05
4.0
3.5
3.0
2.5
2.0
1.5
RECEIVER OUTPUT VOLTAGE (V)
1.0
0.5
5.04.50.5
MAX3443E toc08
1109565 80-10 5 20 35 50-25
VOH, I
= +10mA
OUT
VOL, I
= -10mA
OUT
0
-40 125
TEMPERATURE (°C)
MAX3443E toc06
1109565 80-10 5 20 35 50-25
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