19-2143; Rev 1; 12/01
±10kV ESD-Protected, Quad 5V RS-485/RS-422
Transmitters
General Description
The MAX3040–MAX3045 is a family of 5V quad RS-
485/RS-422 transmitters designed for digital data trans-
mission over twisted-pair balanced lines. All transmitter
outputs are protected to ±10kV using the Human Body
Model. In addition the MAX3040–MAX3045 withstand
±4kV per IEC 1000-4-4 Electrical Fast Transient/Burst
Stressing. The MAX3040/MAX3043 (250kbps) and the
MAX3041/MAX3044 (2.5Mbps) are slew-rate limited
transmitters that minimize EMI and reduce reflections
caused by improperly terminated cables, thus allowing
error-free transmission.
The MAX3040–MAX3045 feature a hot-swap capability*
that eliminates false transitions on the data cable during
power-up or hot insertion. The MAX3042B/MAX3045B
are optimized for data transfer rates up to 20Mbps, the
MAX3041/MAX3044 for data rates up to 2.5Mbps, and
the MAX3040/MAX3043 for data rates up to 250kbps.
The MAX3040–MAX3045 offer optimum performance
when used with the MAX3093E or MAX3095 5V quad
differential line receivers or MAX3094E/MAX3096 3V
quad differential line receivers.
The MAX3040–MAX3045 are ESD-protected pin-compat-
ible, low-power upgrades to the industry-standard
‘SN75174 and ‘DS26LS31C. They are available in space-
saving TSSOP, narrow SO, and wide SO packages.
*Patent pending
Features
o
ESD Protection: ±10kV—Human Body Model
o
Single +5V Operation
o
Guaranteed Device-to-Device Skew
(MAX3040/MAX3041/MAX3043/MAX3044)
o
Pin-Compatible with ‘SN75174, ‘26LS31C and
LTC487
o
Hot-Swappable for Telecom Applications
o
Up to 20Mbps Data Rate (MAX3042B/MAX3045B)
o
Slew-Rate Limited (Data Rates at 2.5Mbps and
250kbps)
o
2nA Low-Power Shutdown Mode
o
1mA Operating Supply Current
o
±4kV EFT Fast Transient Burst Immunity per IEC
1000-4-4
o
Level 2 Surge Immunity per IEC 1000-4-5,
Unshielded Cable Model
o
Ultra-Small 16-Pin TSSOP, 16-Pin Narrow SO, and
Wide 16-Pin SO
MAX3040–MAX3045
Ordering Information
PART
MAX3040CUE
MAX3040CSE
MAX3040CWE
MAX3040EUE
MAX3040ESE
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 TSSOP
16 Narrow SO
16 Wide SO
16 TSSOP
16 Narrow SO
16 Wide SO
DATA
RATE
250kbps
250kbps
250kbps
250kbps
250kbps
250kbps
Applications
Telecommunications Equipment
Industrial Motor Control
Transmitter for ESD-Sensitive Applications
Hand-Held Equipment
Industrial PLCs
Networking
PART
MAX3040
MAX3041
MAX3042B
MAX3043
MAX3044
MAX3045B
DATA RATE
(bps)
250k
2.5M
20M
250k
2.5M
20M
MAX3040EWE -40°C to +85°C
Ordering Information continued at end of data sheet.
Selector Guide
INDUSTRY STANDARD
PINOUT
75174, 34C87, LTC487
75174, 34C87, LTC487
75174, 34C87, LTC487
26LS31
26LS31
26LS31
TOP VIEW
T1IN 1
Y1 2
Z1 3
EN12 4
Z2 5
Y2 6
T2IN 7
GND 8
Pin Configurations
16 V
CC
15 T4IN
14 Y4
MAX3040
MAX3041
MAX3042B
13 Z4
12 EN34
11 Z3
10 Y3
9
T3IN
16 TSSOP/SO
Pin Configurations continued at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
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.
±10kV ESD-Protected, Quad 5V RS-485/RS-422
Transmitters
MAX3040–MAX3045
ABSOLUTE MAXIMUM RATINGS
All voltages referenced to ground (GND).
Supply Voltage (V
CC
).............................................................+7V
Control Input Voltage (EN,
EN,
EN_) .........-0.3V to (V
CC
+ 0.3V)
Driver Input Voltage (T_IN).........................-0.3V to (V
CC
+ 0.3V)
Driver Output Voltage (Y_, Z_)
(Driver Disabled) .............................................-7.5V to +12.5V
Driver Output Voltage (Y_, Z_)
(Driver Enabled) .................................................-7.5V to +10V
Continuous Power Dissipation (T
A
= +70°C)
16-Pin TSSOP (derate 9.4mW/°C above +70°C) ..........755mW
16-Pin Narrow SO (derate 8.70mW/°C above +70°C) ..696mW
16-Pin Wide SO (derate 9.52mW/°C above +70°C) .....762mW
Operating Temperature Range
MAX304_C_E .......................................................0°C to +70°C
MAX304_E_E ....................................................-40°C to +85°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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.
ELECTRICAL CHARACTERISTICS
(V
CC
= +5V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5V and T
A
= +25°C.) (Note 1)
PARAMETER
DRIVER
Driver Differential Output
Change in Magnitude of
Differential Output Voltage
Driver Common-Mode Output
Voltage
Change In Magnitude of
Common-Mode Voltage
Input High Voltage
Input Low Voltage
Hot-Swap Driver Input Current
Driver Input Current
Driver Short-Circuit Output
Current
V
OD
∆V
OD
V
OC
∆V
OC
V
IH
V
IL
I
HOT
SWAP
SYMBOL
CONDITIONS
Figure 1, R = 50Ω
Figure 1, R = 27Ω
Figure 1, R = 50Ω or 27Ω (Note 2)
Figure 1, R = 50Ω or 27Ω
Figure 1, R = 50Ω or 27Ω (Note 2)
T_IN, EN_, EN,
EN
T_IN, EN_, EN,
EN
EN_, EN,
EN
(Note 3)
T_IN, EN_, EN,
EN
-7V < VOUT < +10V (Note 4)
MAX3040/MAX3041/MAX3042B
EN_ = GND
MAX3043/MAX3044/MAX3045B
EN = GND,
EN
= V
CC
Human Body Model
IEC 1000-4-4
MIN
2.0
1.5
TYP
MAX
UNITS
V
0.2
V
CC
/ 2
3
0.2
V
V
V
V
0.8
±200
±1
V
µA
µA
mA
2.0
I
IN
I
SC
±25
±250
Output Leakage (Y_, Z_)
when Disabled
±1
µA
ESD Protection (Y_, Z_)
Electrical Fast Transient/Burst
Immunity
SUPPLY CURRENT
Supply Current
I
CC
±10
±4
kV
kV
No load
MAX3040/MAX3041/MAX3042B
EN_ = GND, T
A
= +25°C
1
2
mA
Supply Current in Shutdown
Mode
I
SHDN
MAX3043/MAX3044/MAX3045B
EN = GND,
EN
= V
CC
, T
A
= +25°C
0.002
10
µA
2
_______________________________________________________________________________________
±10kV ESD-Protected, Quad 5V RS-485/RS-422
Transmitters
SWITCHING CHARACTERISTICS—MAX3040/MAX3043
(V
CC
= +5V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5V and T
A
= +25°C.)
PARAMETER
Maximum Data Rate
Driver Propagation Delay
SYMBOL
f
MAX
t
PLH
t
PHL
Driver Differential Output
Rise-Time/Fall-Time
t
F
t
R
t
DSKEW
Skew Driver to Driver
t
SSKEW
Driver Differential Output Skew
| tPLH - t PHL |
Driver Enable to Output High
Driver Enable from Shutdown to
Output High
Driver Enable to Output Low
Driver Enable from Shutdown to
Output Low
Driver Disable Time from Low
Driver Disable Time from High
t
SKEW
t
ZH
t
ZH(SHDN)
t
ZL
t
ZL(SHDN)
t
LZ
t
HZ
Same chip
Figures 2 and 3,
R
DIFF
= 54Ω, C
DIFF
= 50pF
Figures 2 and 3,
R
DIFF
= 54Ω, C
DIFF
= 50pF
Different chips
Figures 2 and 3,
R
DIFF
= 54Ω,
C
DIFF
= 50pF
0.48
0.48
CONDITIONS
MIN
250
0.7
0.7
0.75
0.75
1.5
µs
1.5
1.33
µs
1.33
±350
ns
±100
±100
2.0
2.0
2.0
2.0
500
500
ns
µs
µs
µs
µs
ns
ns
TYP
MAX
UNITS
kbps
MAX3040–MAX3045
Figures 2 and 3,
R
DIFF
= 54Ω, C
DIFF
= 50pF
MAX3040, Figures 4 and 5, S2 closed,
R
L
= 500Ω, C
L
= 100pF
Figures 4 and 5, S2 closed,
R
L
= 500Ω, C
L
= 100pF
MAX3040, Figures 4 and 5, S1 closed,
R
L
= 500Ω, C
L
= 100pF
Figures 4 and 5, S1 closed,
R
L
= 500Ω, C
L
= 100pF
Figures 4 and 5, S1 closed,
R
L
= 500Ω, C
L
= 15pF
Figures 4 and 5, S2 closed,
R
L
= 500Ω, C
L
= 15pF
SWITCHING CHARACTERISTICS—MAX3041/MAX3044
(V
CC
= +5V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5V and T
A
= +25°C.)
PARAMETER
Maximum Data Rate
Driver Propagation Delay
Driver Differential Output
Rise-Time/Fall-Time
SYMBOL
f
MAX
t
PLH
t
PHL
t
F
t
R
t
DSKEW
Skew Driver to Driver
t
SSKEW
Driver Differential Output Skew
| tPLH - t PHL |
Driver Enable to Output High
t
SKEW
t
ZH
Same chip
Figures 2 and 3,
R
DIFF
= 54Ω, C
DIFF
= 50pF
Figures 2 and 3,
R
DIFF
= 54Ω, C
DIFF
= 50pF
Different chips
Figures 2 and 3,
R
DIFF
= 54Ω,
C
DIFF
= 50pF
33
33
CONDITIONS
MIN
2.5
70
70
70
70
150
150
133
133
±52
±15
±15
400
ns
TYP
MAX
UNITS
Mbps
ns
ns
Figures 2 and 3,
R
DIFF
= 54Ω, C
DIFF
= 50pF
MAX3041, Figures 4 and 5, S2 closed,
R
L
= 500Ω, C
L
= 100pF
ns
ns
_______________________________________________________________________________________
3
±10kV ESD-Protected, Quad 5V RS-485/RS-422
Transmitters
MAX3040–MAX3045
SWITCHING CHARACTERISTICS—MAX3041/MAX3044 (continued)
(V
CC
= +5V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5V and T
A
= +25°C.)
PARAMETER
Driver Enable from Shutdown to
Output High
Driver Enable to Output Low
Driver Enable from Shutdown to
Output Low
Driver Disable Time from Low
Driver Disable Time from High
SYMBOL
t
ZH(SHDN)
t
ZL
t
ZL(SHDN)
t
LZ
t
HZ
CONDITIONS
Figures 4 and 5, S2 closed,
R
L
= 500Ω, C
L
= 100pF
MAX3041, Figures 4 and 5, S1 closed,
R
L
= 500Ω, C
L
= 100pF
Figures 4 and 5, S1 closed,
R
L
= 500Ω, C
L
= 100pF
Figures 4 and 5, S1 closed,
R
L
= 500Ω, C
L
= 15pF
Figures 4 and 5, S2 closed,
R
L
= 500Ω, C
L
= 15pF
MIN
TYP
MAX
400
400
400
500
500
UNITS
ns
ns
ns
ns
ns
SWITCHING CHARACTERISTICS—MAX3042B/MAX3045B
(V
CC
= +5V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5V and T
A
= +25°C.)
PARAMETER
Maximum Data Rate
Driver Propagation Delay
Driver Differential Output
Rise-Time/Fall-Time
Skew Driver to Driver
t
SSKEW
Differential Driver Output Skew
| t
PLH
- t
PHL
|
Driver Enable to Output High
Driver Enable from Shutdown to
Output High
Driver Enable to Output Low
Driver Enable from Shutdown to
Output Low
Driver Disable Time from Low
Driver Disable Time from High
t
SKEW
t
ZH
t
ZH(SHDN)
t
ZL
t
ZL(SHDN)
t
LZ
t
HZ
Same chip
Figures 2 and 3,
R
DIFF
= 54Ω, C
DIFF
= 50pF
MAX3042B, Figures 4 and 5, S2 closed,
R
L
= 500Ω, C
L
= 100pF
Figures 4 and 5, S2 closed,
R
L
= 500Ω, C
L
= 100pF
MAX3042B, Figures 4 and 5, S1 closed,
R
L
= 500Ω, C
L
= 100pF
Figures 4 and 5, S1 closed,
R
L
= 500Ω, C
L
= 100pF
Figures 4 and 5, S1 closed,
R
L
= 500Ω, C
L
= 15pF
Figures 4 and 5, S2 closed,
R
L
= 500Ω, C
L
= 15pF
SYMBOL
f
MAX
t
PLH
t
PHL
t
F
t
R
t
DSKEW
Figures 2 and 3,
R
DIFF
= 54Ω, C
DIFF
= 50pF
Figures 2 and 3,
R
DIFF
= 54Ω, C
DIFF
= 50pF
Different chips
Figures 2 and 3,
R
DIFF
= 54Ω,
C
DIFF
= 50pF
±8
±8
±8
300
300
300
300
400
400
ns
CONDITIONS
MIN
20
23
23
40
40
17
17
TYP
MAX
UNITS
Mbps
ns
ns
ns
ns
ns
ns
ns
ns
ns
Note 1:
All currents into the device are positive; all currents out of the device are negative. All voltages are referenced to device
ground unless otherwise noted.
Note 2:
∆V
OD
and
∆V
OC
are the changes in V
OD
and V
OC
, respectively, when the transmitter input changes state.
Note 3:
This input current level is for the hot-swap enable (EN_, EN,
EN)
inputs and is present until the first transition only. After the
first transition the input reverts to a standard high-impedance CMOS input with input current I
IN
. For the first 20µs the input
current may be as high as 1mA. During this period the input is disabled.
Note 4:
Maximum current level applies to peak current just prior to foldback-current limiting. Minimum current level applies during
current limiting.
4 _______________________________________________________________________________________
±10kV ESD-Protected, Quad 5V RS-485/RS-422
Transmitters
MAX3040–MAX3045
Typical Operating Characteristics
(V
CC
= +5V, T
A
= +25°C, unless otherwise noted.)
MAX3040/MAX3043
SUPPLY CURRENT vs. DATA RATE
MAX3040 toc01
MAX3041/MAX3044
SUPPLY CURRENT vs. DATA RATE
35
SUPPLY CURRENT (mA)
30
25
20
15
10
5
0
NO LOAD
ALL FOUR TRANSMITTERS
SWITCHING
MAX3040 toc02
MAX3042B/MAX3045B
SUPPLY CURRENT vs. DATA RATE
NO LOAD
ALL FOUR TRANSMITTERS
SWITCHING
MAX3040 toc03
45
40
SUPPLY CURRENT (mA)
35
30
25
20
15
10
5
0
0.1
1
10
DATA RATE (kbps)
100
NO LOAD
ALL FOUR TRANSMITTERS
SWITCHING
40
60
50
SUPPLY CURRENT (mA)
40
30
20
10
0
1000
0.1
1
10
100
1000
10,000
0.1
1
10
100
1000 10,000 100,000
DATA RATE (kbps)
DATA RATE (kbps)
SUPPLY CURRENT vs. TEMPERATURE
MAX3040 toc04
OUTPUT CURRENT vs. TRANSMITTER
OUTPUT HIGH VOLTAGE
MAX3040 toc06
OUTPUT CURRENT vs. TRANSMITTER
OUTPUT LOW VOLTAGE
MAX3040 toc06
1.2
V
CC
= 5.25V
V
CC
= 5V
1.0
V
CC
= 4.75V
80
70
OUTPUT CURRENT (mA)
60
50
40
30
20
10
0
70
60
OUTPUT CURRENT (mA)
50
40
30
20
10
0
1.1
SUPPLY CURRENT (mA)
0.9
0.8
NO LOAD
NO SWITCHING
0.7
0
10
20
30
40
50
60
70
TEMPERATURE (°C)
-7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6
OUTPUT LOW VOLTAGE (V)
0
2
4
6
8
10
OUTPUT LOW VOLTAGE (V)
OUTPUT CURRENT
vs. DIFFERENTIAL OUTPUT VOLTAGE
MAX3040 toc07
TRANSMITTER DIFFERENTIAL OUTPUT
VOLTAGE vs. TEMPERATURE
DIFFERENTIAL OUTPUT VOLTAGE (V)
2.50
2.45
2.40
2.35
2.30
2.25
2.20
2.15
2.10
MAX3040 toc08
70
60
OUTPUT CURRENT (mA)
50
40
30
20
10
0
0
1
2
3
4
5
DIFFERENTIAL OUTPUT VOLTAGE (V)
2.55
R
DIFF
= 54Ω
0
10
20
30
40
50
60
70
TEMPERATURE (°C)
_______________________________________________________________________________________
5
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