Maxim MAX3041 ±10kv esd-protected, quad 5v rs-485/rs-422 transmitter Datasheet

19-2143; Rev 1; 12/01
±10kV ESD-Protected, Quad 5V RS-485/RS-422
Transmitters
The MAX3040–MAX3045 is a family of 5V quad RS485/RS-422 transmitters designed for digital data transmission 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-compatible, low-power upgrades to the industry-standard
‘SN75174 and ‘DS26LS31C. They are available in spacesaving TSSOP, narrow SO, and wide SO packages.
Features
♦ ESD Protection: ±10kV—Human Body Model
♦ Single +5V Operation
♦ Guaranteed Device-to-Device Skew
(MAX3040/MAX3041/MAX3043/MAX3044)
♦ Pin-Compatible with ‘SN75174, ‘26LS31C and
LTC487
♦ Hot-Swappable for Telecom Applications
♦ Up to 20Mbps Data Rate (MAX3042B/MAX3045B)
♦ Slew-Rate Limited (Data Rates at 2.5Mbps and
250kbps)
♦ 2nA Low-Power Shutdown Mode
♦ 1mA Operating Supply Current
♦ ±4kV EFT Fast Transient Burst Immunity per IEC
1000-4-4
♦ Level 2 Surge Immunity per IEC 1000-4-5,
Unshielded Cable Model
♦ Ultra-Small 16-Pin TSSOP, 16-Pin Narrow SO, and
Wide 16-Pin SO
Ordering Information
DATA
RATE
PART
TEMP RANGE
PIN-PACKAGE
MAX3040CUE
0°C to +70°C
16 TSSOP
250kbps
MAX3040CSE
0°C to +70°C
16 Narrow SO
250kbps
*Patent pending
Applications
Telecommunications Equipment
MAX3040CWE
0°C to +70°C
16 Wide SO
250kbps
Industrial Motor Control
MAX3040EUE
-40°C to +85°C
16 TSSOP
250kbps
Transmitter for ESD-Sensitive Applications
MAX3040ESE
-40°C to +85°C
16 Narrow SO
250kbps
Hand-Held Equipment
MAX3040EWE -40°C to +85°C
16 Wide SO
250kbps
Industrial PLCs
Ordering Information continued at end of data sheet.
Networking
PART
Pin Configurations
Selector Guide
DATA RATE
(bps)
INDUSTRY STANDARD
PINOUT
TOP VIEW
T1IN 1
16 VCC
MAX3040
250k
75174, 34C87, LTC487
Y1 2
15 T4IN
MAX3041
2.5M
75174, 34C87, LTC487
Z1 3
14 Y4
MAX3042B
20M
75174, 34C87, LTC487
EN12 4
MAX3043
250k
26LS31
Z2 5
MAX3044
2.5M
26LS31
Y2 6
11 Z3
MAX3045B
20M
26LS31
T2IN 7
10 Y3
GND 8
9
MAX3040
MAX3041
MAX3042B
13 Z4
12 EN34
T3IN
16 TSSOP/SO
Pin Configurations continued at end of data sheet.
________________________________________________________________ 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.
1
MAX3040–MAX3045
General Description
MAX3040–MAX3045
±10kV ESD-Protected, Quad 5V RS-485/RS-422
Transmitters
ABSOLUTE MAXIMUM RATINGS
All voltages referenced to ground (GND).
Supply Voltage (VCC).............................................................+7V
Control Input Voltage (EN, EN, EN_) .........-0.3V to (VCC + 0.3V)
Driver Input Voltage (T_IN).........................-0.3V to (VCC + 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 (TA = +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
(VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
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
VOD
∆VOD
VOC
∆VOC
Figure 1, R = 50Ω
2.0
Figure 1, R = 27Ω
1.5
Figure 1, R = 50Ω or 27Ω (Note 2)
Figure 1, R = 50Ω or 27Ω
VCC / 2
Figure 1, R = 50Ω or 27Ω (Note 2)
VIH
T_IN, EN_, EN, EN
VIL
T_IN, EN_, EN, EN
IHOT
V
IIN
T_IN, EN_, EN, EN
ISC
-7V < VOUT < +10V (Note 4)
±25
MAX3040/MAX3041/MAX3042B
EN_ = GND
Output Leakage (Y_, Z_)
when Disabled
3
V
0.2
V
V
EN_, EN, EN (Note 3)
Driver Short-Circuit Output
Current
V
2.0
SWAP
Driver Input Current
0.2
MAX3043/MAX3044/MAX3045B
EN = GND, EN = VCC
0.8
V
±200
µA
±1
µA
±250
mA
±1
µA
ESD Protection (Y_, Z_)
Human Body Model
±10
kV
Electrical Fast Transient/Burst
Immunity
IEC 1000-4-4
±4
kV
No load
1
2
mA
0.002
10
µA
SUPPLY CURRENT
Supply Current
Supply Current in Shutdown
Mode
2
ICC
MAX3040/MAX3041/MAX3042B
EN_ = GND, TA = +25°C
ISHDN
MAX3043/MAX3044/MAX3045B
EN = GND, EN = VCC, TA = +25°C
_______________________________________________________________________________________
±10kV ESD-Protected, Quad 5V RS-485/RS-422
Transmitters
(VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.)
PARAMETER
Maximum Data Rate
SYMBOL
CONDITIONS
fMAX
Driver Propagation Delay
tPLH
tPHL
Driver Differential Output
Rise-Time/Fall-Time
tF
tR
TYP
MAX
250
UNITS
kbps
0.7
1.5
0.7
1.5
0.48
0.75
1.33
0.48
0.75
1.33
Figures 2 and 3,
R DIFF = 54Ω, C DIFF = 50pF
µs
Figures 2 and 3,
R DIFF = 54Ω, C DIFF = 50pF
µs
tDSKEW
Different chips
tSSKEW
Same chip
tSKEW
Figures 2 and 3,
R DIFF = 54Ω, C DIFF = 50pF
Skew Driver to Driver
Driver Differential Output Skew
| tPLH - t PHL |
MIN
±350
Figures 2 and 3,
RDIFF = 54Ω,
CDIFF = 50pF
ns
±100
±100
ns
MAX3040, Figures 4 and 5, S2 closed,
R L = 500Ω, C L = 100pF
2.0
µs
Figures 4 and 5, S2 closed,
R L = 500Ω, C L = 100pF
2.0
µs
MAX3040, Figures 4 and 5, S1 closed,
R L = 500Ω, C L = 100pF
2.0
µs
tZL(SHDN)
Figures 4 and 5, S1 closed,
R L = 500Ω, C L = 100pF
2.0
µs
Driver Disable Time from Low
tLZ
Figures 4 and 5, S1 closed,
R L = 500Ω, C L = 15pF
500
ns
Driver Disable Time from High
tHZ
Figures 4 and 5, S2 closed,
R L = 500Ω, C L = 15pF
500
ns
TYP
MAX
UNITS
70
150
70
150
33
70
133
33
70
133
Driver Enable to Output High
Driver Enable from Shutdown to
Output High
Driver Enable to Output Low
Driver Enable from Shutdown to
Output Low
tZH
tZH(SHDN)
tZL
SWITCHING CHARACTERISTICS—MAX3041/MAX3044
(VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.)
PARAMETER
Maximum Data Rate
Driver Propagation Delay
Driver Differential Output
Rise-Time/Fall-Time
SYMBOL
CONDITIONS
fMAX
tPLH
tPHL
tF
tR
2.5
Figures 2 and 3,
RDIFF = 54Ω, C DIFF = 50pF
Figures 2 and 3,
RDIFF = 54Ω, C DIFF = 50pF
Driver Enable to Output High
Mbps
ns
ns
±52
tDSKEW
Different chips
tSSKEW
Same chip
tSKEW
Figures 2 and 3,
RDIFF = 54Ω, C DIFF = 50pF
±15
ns
MAX3041, Figures 4 and 5, S2 closed,
RL = 500Ω, C L = 100pF
400
ns
Skew Driver to Driver
Driver Differential Output Skew
| tPLH - t PHL |
MIN
tZH
Figures 2 and 3,
RDIFF = 54Ω,
CDIFF = 50pF
±15
ns
_______________________________________________________________________________________
3
MAX3040–MAX3045
SWITCHING CHARACTERISTICS—MAX3040/MAX3043
MAX3040–MAX3045
±10kV ESD-Protected, Quad 5V RS-485/RS-422
Transmitters
SWITCHING CHARACTERISTICS—MAX3041/MAX3044 (continued)
(VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.)
PARAMETER
MAX
UNITS
Figures 4 and 5, S2 closed,
RL = 500Ω, C L = 100pF
400
ns
MAX3041, Figures 4 and 5, S1 closed,
RL = 500Ω, C L = 100pF
400
ns
tZL(SHDN)
Figures 4 and 5, S1 closed,
RL = 500Ω, C L = 100pF
400
ns
Driver Disable Time from Low
tLZ
Figures 4 and 5, S1 closed,
RL = 500Ω, C L = 15pF
500
ns
Driver Disable Time from High
tHZ
Figures 4 and 5, S2 closed,
RL = 500Ω, C L = 15pF
500
ns
TYP
MAX
UNITS
23
40
23
40
Driver Enable from Shutdown to
Output High
Driver Enable to Output Low
Driver Enable from Shutdown to
Output Low
SYMBOL
tZH(SHDN)
tZL
CONDITIONS
MIN
TYP
SWITCHING CHARACTERISTICS—MAX3042B/MAX3045B
(VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.)
PARAMETER
Maximum Data Rate
Driver Propagation Delay
Driver Differential Output
Rise-Time/Fall-Time
SYMBOL
CONDITIONS
fMAX
tPLH
tPHL
tF
tR
MIN
20
Figures 2 and 3,
RDIFF = 54Ω, C DIFF = 50pF
Mbps
17
Figures 2 and 3,
RDIFF = 54Ω, C DIFF = 50pF
17
Figures 2 and 3,
R DIFF = 54Ω,
CDIFF = 50pF
ns
ns
±8
tDSKEW
Different chips
tSSKEW
Same chip
tSKEW
Figures 2 and 3,
RDIFF = 54Ω, C DIFF = 50pF
±8
ns
MAX3042B, Figures 4 and 5, S2 closed,
RL = 500Ω, C L = 100pF
300
ns
Figures 4 and 5, S2 closed,
RL = 500Ω, C L = 100pF
300
ns
MAX3042B, Figures 4 and 5, S1 closed,
RL = 500Ω, C L = 100pF
300
ns
tZL(SHDN)
Figures 4 and 5, S1 closed,
RL = 500Ω, C L = 100pF
300
ns
Driver Disable Time from Low
tLZ
Figures 4 and 5, S1 closed,
RL = 500Ω, C L = 15pF
400
ns
Driver Disable Time from High
tHZ
Figures 4 and 5, S2 closed,
RL = 500Ω, C L = 15pF
400
ns
Skew Driver to Driver
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
tZH
tZH(SHDN)
tZL
±8
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: ∆VOD and ∆VOC are the changes in VOD and VOC, 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 IIN. 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
25
20
15
30
25
20
15
10
40
30
20
10
5
5
0
0
0
0.1
1
10
100
1000
NO LOAD
ALL FOUR TRANSMITTERS
SWITCHING
50
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
0.1
1
10
100
1000
0.1
10,000
1
10
100
1000 10,000 100,000
DATA RATE (kbps)
DATA RATE (kbps)
DATA RATE (kbps)
SUPPLY CURRENT vs. TEMPERATURE
OUTPUT CURRENT vs. TRANSMITTER
OUTPUT HIGH VOLTAGE
OUTPUT CURRENT vs. TRANSMITTER
OUTPUT LOW VOLTAGE
1.0
VCC = 4.75V
0.9
MAX3040 toc06
60
60
OUTPUT CURRENT (mA)
VCC = 5V
70
MAX3040 toc06
70
OUTPUT CURRENT (mA)
VCC = 5.25V
1.1
80
MAX3040 toc04
1.2
50
40
30
20
50
40
30
20
0.8
NO LOAD
NO SWITCHING
10
10
0
0
0.7
30
40
50
60
-7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6
70
TEMPERATURE (°C)
0
2
OUTPUT LOW VOLTAGE (V)
OUTPUT CURRENT
vs. DIFFERENTIAL OUTPUT VOLTAGE
4
6
8
10
OUTPUT LOW VOLTAGE (V)
TRANSMITTER DIFFERENTIAL OUTPUT
VOLTAGE vs. TEMPERATURE
70
60
50
40
30
20
10
2.55
2.50
MAX3040 toc08
20
MAX3040 toc07
10
OUTPUT CURRENT (mA)
0
DIFFERENTIAL OUTPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
30
10
SUPPLY CURRENT (mA)
NO LOAD
ALL FOUR TRANSMITTERS
SWITCHING
35
60
MAX3040 toc02
NO LOAD
ALL FOUR TRANSMITTERS
SWITCHING
35
40
MAX3040 toc01
45
40
MAX3042B/MAX3045B
SUPPLY CURRENT vs. DATA RATE
MAX3041/MAX3044
SUPPLY CURRENT vs. DATA RATE
MAX3040 toc03
MAX3040/MAX3043
SUPPLY CURRENT vs. DATA RATE
RDIFF = 54Ω
2.45
2.40
2.35
2.30
2.25
2.20
2.15
0
2.10
0
1
2
3
4
DIFFERENTIAL OUTPUT VOLTAGE (V)
5
0
10
20
30
40
50
60
70
TEMPERATURE (°C)
_______________________________________________________________________________________
5
MAX3040–MAX3045
Typical Operating Characteristics
(VCC = +5V, TA = +25°C, unless otherwise noted.)
±10kV ESD-Protected, Quad 5V RS-485/RS-422
Transmitters
MAX3040–MAX3045
Pin Description
PIN
MAX3040/MAX3041/
MAX3042B
MAX3043/MAX3044/
MAX3045B
NAME
1
1
T1IN
2
2
Y1
Noninverting Transmitter 1 Output
3
3
Z1
Inverting Transmitter 1 Output
EN
Transmitter Enable High Input. Drive EN high to enable all four
transmitters. When EN is low and EN is high, all transmitters are
disabled and the part enters a low-power shutdown state. The
transmitter outputs are high impedance when disabled.
—
Transmitter 1 Input
Transmitter Enable Input to Control Transmitters 1 and 2. Drive EN12
high to enable transmitters 1 and 2. Drive EN12 low to disable
transmitters 1 and 2. The transmitter outputs are high impedance
when disabled. The part enters a low-power shutdown state when
both EN12 and EN34 are low.
4
—
EN12
5
5
Z2
Inverting Transmitter 2 Output
6
6
Y2
Noninverting Transmitter 2 Output
7
7
T2IN
Transmitter 2 Input
8
8
GND
Ground
9
9
T3IN
Transmitter 3 Input
10
10
Y3
Noninverting Transmitter 3 Output
11
11
Z3
Inverting Transmitter 3 Output
EN
Transmitter Enable Low Input. Drive EN low to enable all four
transmitters. When EN is low and EN is high, all transmitters are
disabled and the part enters a low-power shutdown state. The
transmitter outputs are high impedance when disabled.
—
12
6
4
FUNCTION
12
—
EN34
Transmitter Enable Input to Control Transmitters 3 and 4. Drive EN34
high to enable transmitters 3 and 4. Drive EN34 low to disable
transmitters 3 and 4. The transmitter outputs are high impedance
when disabled. The part enters a low-power shutdown state when
both EN12 and EN34 are low.
13
13
Z4
Inverting Transmitter 4 Output
14
14
Y4
Noninverting Transmitter 4 Output
15
15
T4IN
Transmitter 4 Input
16
16
VCC
Positive Supply. Bypass with a 0.1µF capacitor to GND.
_______________________________________________________________________________________
±10kV ESD-Protected, Quad 5V RS-485/RS-422
Transmitters
The MAX3040–MAX3045 are quad RS-485/RS-422 transmitters. They operate from a single +5V power supply
and are designed to give optimum performance when
used with the MAX3093E/MAX3095 5V quad RS-485/
RS-422 receivers or MAX3094E/MAX3096 3V quad
RS-485/RS-422 receivers. The MAX3040–MAX3045 only
need 1mA of operating supply current and consume 2nA
when they enter a low-power shutdown mode. The
MAX3040–MAX3045 also feature a hot-swap capability
allowing line insertion without erroneous data transfer.
The MAX3042B/MAX3045B are capable of transferring
data up to 20Mbps, the MAX3041/MAX3044 for data
rates up to 2.5Mbps, and the MAX3040/MAX3043 for
data rates up to 250kbps. All transmitter outputs are protected to ±10kV using the Human Body Model.
ESD Test Conditions
ESD performance depends on a number of conditions.
Contact Maxim for a reliability report that documents
test setup, methodology, and results.
Human Body Model
Figure 6a shows the Human Body Model, and Figure
6b shows the current waveform it generates when discharged into low impedance. This model consists of a
100pF capacitor charged to the ESD voltage of interest,
which is then discharged into the device through a
1.5kΩ resistor.
3V
DI
1.5V
1.5V
0
tPLH
tPHL
1/2 VO
±10kV ESD Protection
As with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against electrostatic discharges (ESD) encountered during handling
and assembly. The MAX3040–MAX3045 transmitter
outputs have extra protection against electrostatic discharges found in normal operation. Maxim’s engineers
have developed state-of-the-art structures to protect
these pins against the application of ±10kV ESD
(Human Body Model), without damage.
Z
VO
Y
1/2 VO
VO
VDIFF
0
-VO
VDIFF = V (Y) - V (Z)
90%
90%
10%
tR
10%
tF
tSKEW = | tPLH - tPHL |
Figure 3. Driver Propagation Delays
Y
VCC
S1
RL
R
OUTPUT
UNDER TEST
VOD
CL
VOC
S2
R
Figure 4. Driver Enable/Disable Timing Test Load
Z
Figure 1. Driver DC Test Circuit
3V
DE
1.5V
1.5V
0
5V
DE
tZL(SHDN), tZL
tLZ
Y, Z
DI
Y
VOD
Z
RDIFF
CDIFF
VOL
2.5V OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
Y, Z
VOH -0.5V
2.5V
0
tZH(SHDN), tZH
Figure 2. Driver Timing Test Circuit
VOL +0.5V
tHZ
Figure 5. Driver Enable and Disable Times
_______________________________________________________________________________________
7
MAX3040–MAX3045
Detailed Description
MAX3040–MAX3045
±10kV ESD-Protected, Quad 5V RS-485/RS-422
Transmitters
Machine Model
The Machine Model for ESD testing uses a 200pF storage capacitor and zero-discharge resistance. It mimics
the stress caused by handling during manufacturing
and assembly. Of course, all pins (not just RS-485
inputs) require this protection during manufacturing.
Therefore, the Machine Model is less relevant to the I/O
ports than are the Human Body Model.
±4kV Electrical Fast Transient/Burst Testing
(IEC 1000-4-4)
IEC 1000-4-4 Electrical Fast Transient/Burst (EFT/B) is
an immunity test for the evaluation of electrical and
electronic systems during operating conditions. The
test was adapted for evaluation of integrated circuits
with power applied. Repetitive fast transients with
severe pulsed EMI were applied to signal and control
ports. Over 15,000 distinct discharges per minute are
sent to each interface port of the IC or equipment under
test (EUT) simultaneously with a minimum test duration
time of one minute. This simulates stress due to displacement current from electrical transients on AC
mains, or other telecommunication lines in close proximity. Short rise times and very specific repetition rates
are essential to the validity of the test.
Stress placed on the EUT is severe. In addition to the
controlled individual discharges placed on the EUT,
extraneous noise and ringing on the transmission line
can multiply the number of discharges as well as
increase the magnitude of each discharge. All cabling
was left unterminated to simulate worst-case reflections.
The MAX3040–MAX3045 were setup as specified in
IEC 1000-4-4 and the Typical Operating Circuit of this
data sheet. The amplitude, pulse rise time, pulse duration, pulse repetition period, burst duration, and burst
period (Figure 8) of the burst generator were all verified
with a digital oscilloscope according to the specifications in IEC 1000-4-4 sections 6.1.1 and 6.1.2. A simplified diagram of the EFT/B generator is shown in Figure
7. The burst stresses were applied to Y1–Y4 and Z1–Z4
simultaneously.
IEC 1000-4-4 provides several levels of test severity
(see Table 1). The MAX3040–MAX3045 pass the 4000V
stress, a special category “X” beyond the highest level
for severe (transient) industrial environments for
telecommunication lines.
8
RC
1MΩ
CHARGE-CURRENT
LIMIT RESISTOR
HIGHVOLTAGE
DC
SOURCE
Cs
100pF
RD
1.5kΩ
DISCHARGE
RESISTANCE
DEVICE
UNDER
TEST
STORAGE
CAPACITOR
Figure 6a. Human Body ESD Test Model
IP 100%
90%
Ir
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
AMPERES
36.8%
10%
0
0
tRL
TIME
tDL
CURRENT WAVEFORM
Figure 6b. Human Body Model Current Waveform
Table 1. Test Severity Levels for
Communication Lines
ON I/O,
SIGNAL, DATA
AND CONTROL
LEVEL
PORTS
PEAK
VOLTAGE
INDUSTRIAL
ELECTROMAGNETIC
ENVIROMENT
EFT
REPETITION
RATE (kHz)
1
250
5
Well protected
2
500
5
Protected
3
1000
5
Typical
4
2000
5
Severe
X
4000
5
MAX3040–MAX3045
_______________________________________________________________________________________
±10kV ESD-Protected, Quad 5V RS-485/RS-422
Transmitters
SPARK GAP
RC
The stresses are applied while the MAX3040–MAX3045
are powered up. Test results are reported as:
1) Normal performance within the specification limits.
2) Temporary degradation or loss of function or performance which is self-recoverable.
3) Temporary degradation, loss of function or performance requiring operator intervention, such as system reset.
4) Degradation or loss of function not recoverable due
to damage.
The MAX3040–MAX3045 meets classification 2 listed
above. Additionally, the MAX3040–MAX3045 will not
latchup during the IEC burst stress events.
U
RM
CD
MAX3040–MAX3045
IEC 1000-4-4 Burst/Electrical Fast
Transient Test Levels
(For Communication Lines)
COAXIAL
OUTPUT
50Ω
RS
CE
U = HIGH-VOLTAGE SOURCE
RC = CHARGING RESISTOR
CE = ENERGY STORAGE CAPACITOR
RS = PULSE DURATION SHAPING RESISTOR
RM = IMPEDANCE MATCHING RESISTOR
CD = DC BLOCKING CAPACITOR
Figure 7. Simplified Circuit Diagram of a Fast Transient/Burst
Generator
Hot-Swap Capability
Hot-Swap Inputs
When circuit boards are plugged into a “hot” backplane, there can be disturbances to the differential signal levels that could be detected by receivers
connected to the transmission line. This erroneous data
could cause data errors to an RS-485/RS-422 system.
To avoid this, the MAX3040–MAX3045 have hot-swap
capable inputs.
When a circuit board is plugged into a “hot” backplane
there is an interval during which the processor is going
through its power-up sequence. During this time, the
processor’s output drivers are high impedance and will
be unable to drive the enable inputs of the
MAX3040–MAX3045 (EN, EN, EN_) to defined logic levels. Leakage currents from these high impedance drivers, of as much as 10µA, could cause the enable
inputs of the MAX3040–MAX3045 to drift high or low.
Additionally, parasitic capacitance of the circuit board
could cause capacitive coupling of the enable inputs to
either GND or V CC . These factors could cause the
enable inputs of the MAX3040–MAX3045 to drift to levels that may enable the transmitter outputs (Y_ and Z_).
To avoid this problem, the hot-swap input provides a
method of holding the enable inputs of the
MAX3040–MAX3045 in the disabled state as V CC
ramps up. This hot-swap input is able to overcome the
leakage currents and parasitic capacitances that may
pull the enable inputs to the enabled state.
Hot-Swap Input Circuitry
In the MAX3040–MAX3045 the enable inputs feature
hot-swap capability. At the input there are two NMOS
PULSE
REPETITION PERIOD (DEPENDS ON THE TEST VOLTAGE LEVER,
IN CONFORMITY WITH THE VALUES INDICATED IN 6.1.2).
BURST
15ms
BURST DURATION
BURST PERIOD 300ms
Figure 8. General Graph of a Fast Transient Burst
devices, Q1 and Q2 (Figure 9). When VCC is ramping
up from 0, an internal 10µs timer turns on Q2 and sets
the SR latch, which also turns on Q1. Transistors Q2, a
700µA current sink, and Q1, an 85µA current sink, pull
EN to GND through a 5.6kΩ resistor. Q2 is designed to
pull the EN input to the disabled state against an external parasitic capacitance of up to 100pF that is trying to
enable the EN input. After 10µs, the timer turns Q2 off
and Q1 remains on, holding the EN input low against
three-state output leakages that might enable EN. Q1
remains on until an external source overcomes the
_______________________________________________________________________________________
9
MAX3040–MAX3045
±10kV ESD-Protected, Quad 5V RS-485/RS-422
Transmitters
VCC
10µs
TIMER
TIMER
5.6kΩ
EN
(HOT SWAP)
EN
85µA
Q1
700µA
Q2
Figure 9. Simplified Structure of the Driver Enable Pin (EN)
required input current. At this time the SR latch resets
and Q1 turns off. When Q1 turns off, EN reverts to a
standard, high-impedance CMOS input. Whenever VCC
drops below 1V, the hot-swap input is reset.
The EN12 and EN34 input structures are identical to the
EN input. For the EN input, there is a complimentary circuit employing two PMOS devices pulling the EN input
to VCC.
Hot-Swap Line Transient
The circuit of Figure 10 shows a typical offset termination used to guarantee a greater than 200mV offset
when a line is not driven. The 50pF represents the minimum parasitic capacitance which would exist in a typical application. In most cases, more capacitance exists
in the system and will reduce the magnitude of the
glitch. During a “hot-swap” event when the driver is
connected to the line and is powered up, the driver
must not cause the differential signal to drop below
200mV. Figures 11 and 12 show the results of the
MAX3040–MAX3045 during power-up for two different
VCC ramp rates (0.1V/µs and 1V/µs). The photos show
the VCC ramp, the single-ended signal on each side of
the 100Ω termination, the differential signal across the
termination, and shows the hot-swap line transient
stays above the 200mV RS-485 specification.
10
Operation of Enable Pins
The MAX3040–MAX3045 family has two enable-functional versions:
The MAX3040/MAX3041/MAX3042B have two transmitter enable inputs EN12 and EN34. EN12 controls the
transmitters 1 and 2, and EN34 controls transmitters 3
and 4. EN12 and EN34 are active-high and the part will
enter the low-power shutdown mode when both are
pulled low. The transmitter outputs are high impedance
when disabled (Table 2).
The MAX3043/MAX3044/MAX3045B have two transmitter enable inputs EN and EN, which are active-high and
active-low, respectively. When EN is logic high or EN is
logic low all transmitters are active. When EN is pulled
low and EN is driven high, all transmitters are disabled
and the part enters the low-power shutdown mode. The
transmitter outputs are high impedance when disabled
(Table 3).
Applications Information
Typical Applications
The MAX3040–MAX3045 offer optimum performance
when used with the MAX3093E/MAX3095 5V quad
receivers or MAX3094E/MAX3096 3V quad differential
line receivers. Figure 13 shows a typical RS-485 connection for transmitting and receiving data and Figure
14 shows a typical multi-point connection.
______________________________________________________________________________________
±10kV ESD-Protected, Quad 5V RS-485/RS-422
Transmitters
Table 3. Function Table for MAX3043/
MAX3044/MAX3045B
(Each Pair of Transmitters)
(All Transmitters)
OUTPUTS
INPUT
EN_
Y_
H
H
L
L
H
L
H
L
High-Z
H = Logic High
L = Logic Low
High-Z
X = Don’t Care
High-Z = High Impedance
VCC
EN
EN
H
H
X
Z_
H
X
INPUT
OUTPUTS
Y
Z
H
L
H
L
H
X
L
H
X
L
H
L
L
X
L
L
H
X
L
H
High-Z
High-Z
H = Logic High
X = Don’t Care
L = Logic Low
High-Z = High Impedance
5V
1kΩ
Y
TIN
(VCC OR GND)
0.1kΩ
VCC
2V/div
Y
200mV/div
Z
200mV/div
50pF
Z
1kΩ
Y-Z
(20mV/div)
238mV
Figure 10. Differential Power-Up Glitch (Hot Swap)
Figure 11. Differential Power-Up Glitch (0.1V/µs)
VCC
2V/div
Y
50mV/div
Z
50mV/div
Y-Z
(5mV/div)
238mV
1µs/div
Figure 12. Differential Power-Up Glitch (1V/µs)
______________________________________________________________________________________
11
MAX3040–MAX3045
Table 2. Function Table for MAX3040/
MAX3041/MAX3042B
MAX3040–MAX3045
±10kV ESD-Protected, Quad 5V RS-485/RS-422
Transmitters
MAX3043–MAX3045
MAX3095
T1IN
D1
RT
R1
R1OUT
T2IN
D2
RT
R2
R2OUT
T3IN
D3
RT
R3
R3OUT
T4IN
D4
RT
R4
R4OUT
EN
EN
G
G
VCC
GND
VCC
GND
Figure 13. Typical Connection of a Quad Transmitter and a Quad Receiver as a Pair
Typical Multiple-Point Connection
Figure 14 shows a typical multiple-point connection for
the MAX3040–MAX3045 with the MAX3095. Because of
the high frequencies and the distances involved, high
attention must be paid to transmission-line effects while
using termination resistors. A terminating resistor (RT)
is simply a resistor that should be placed at the
extreme ends of the cable to match the characteristic
impedance of the cable. When the termination resistance is not the same value as the characteristic
12
impedance of the cable, reflections will occur as the
signal is traveling down the cable. Although some
reflections are inevitable due to the cable and resistor
tolerances, large mismatches can cause significant
reflections resulting in errors in the data. With this in
mind, it is very important to match the terminating resistance and the characteristic impedance as closely as
possible. As a general rule in a multi-drop system, termination resistors should always be placed at both ends of
the cable.
______________________________________________________________________________________
±10kV ESD-Protected, Quad 5V RS-485/RS-422
Transmitters
1/4 MAX3040–MAX3045
RT
RT
1/4 MAX3095
1/4 MAX3095
UP TO 32 RS-485
UNIT LOADS
1/4 MAX3040–MAX3045
1/4 MAX3040–MAX3045
1/4 MAX3095
1/4 MAX3095
Figure 12. Typical Connection for Multiple-Point RS-485 Bus
Ordering Information (continued)
PART
MAX3041CUE
TEMP RANGE
0°C to +70°C
PIN-PACKAGE
16 TSSOP
DATA
RATE
PART
2.5Mbps
MAX3045BCUE
0°C to +70°C
16 TSSOP
20Mbps
0°C to +70°C
16 Narrow SO
20Mbps
0°C to +70°C
TEMP RANGE
PIN-PACKAGE
DATA
RATE
0°C to +70°C
16 Narrow SO
2.5Mbps
MAX3045BCSE
MAX3041CWE
0°C to +70°C
16 Wide SO
2.5Mbps
MAX3045BCWE
16 Wide SO
20Mbps
MAX3041EUE
-40°C to +85°C
16 TSSOP
2.5Mbps
MAX3045BEUE -40°C to +85°C
16 TSSOP
20Mbps
MAX3041ESE
-40°C to +85°C
16 Narrow SO
2.5Mbps
MAX3045BESE -40°C to +85°C
16 Narrow SO
20Mbps
MAX3041EWE
-40°C to +85°C
MAX3045BEWE -40°C to +85°C
16 Wide SO
20Mbps
MAX3041CSE
16 Wide SO
2.5Mbps
MAX3042BCUE
0°C to +70°C
16 TSSOP
20Mbps
MAX3042BCSE
0°C to +70°C
16 Narrow SO
20Mbps
MAX3042BCWE
0°C to +70°C
Pin Configurations (continued)
16 Wide SO
20Mbps
MAX3042BEUE -40°C to +85°C
16 TSSOP
20Mbps
MAX3042BESE -40°C to +85°C
16 Narrow SO
20Mbps
T1IN 1
16 VCC
MAX3042BEWE -40°C to +85°C
15 T4IN
TOP VIEW
16 Wide SO
20Mbps
Y1 2
MAX3043CUE
0°C to +70°C
16 TSSOP
250kbps
Z1 3
MAX3043CSE
0°C to +70°C
16 Narrow SO
250kbps
EN 4
MAX3043EWE
0°C to +70°C
16 Wide SO
250kbps
Z2 5
MAX3043EUE
-40°C to +85°C
16 TSSOP
250kbps
Y2 6
11 Z3
MAX3043ESE
-40°C to +85°C
16 Narrow SO
250kbps
T2IN 7
10 Y3
MAX3043EWE
-40°C to +85°C
16 Wide SO
250kbps
GND 8
9
MAX3044CUE
0°C to +70°C
16 TSSOP
2.5Mbps
MAX3044CSE
0°C to +70°C
16 Narrow SO
2.5Mbps
MAX3044CWE
0°C to +70°C
16 Wide SO
2.5Mbps
MAX3044EUE
-40°C to +85°C
16 TSSOP
2.5Mbps
MAX3044ESE
-40°C to +85°C
16 Narrow SO
2.5Mbps
MAX3044EWE
-40°C to +85°C
16 Wide SO
2.5Mbps
14 Y4
MAX3043
MAX3044
MAX3045B
13 Z4
12 EN
T3IN
16 TSSOP/SO
Chip Information
TRANSISTOR COUNT: 545
PROCESS: CMOS
______________________________________________________________________________________
13
MAX3040–MAX3045
1/4 MAX3040–MAX3045
MAX3040–MAX3045
±10kV ESD-Protected, Quad 5V RS-485/422
Transmitters
Ordering Information (continued)
PART
TEMP.
RANGE
MAX3041CUE
0°C to +70°C
PIN-PACKAGE
16 TSSOP
DATA
RATE
DATA
RATE
PART
TEMP.
RANGE
2.5Mbps
MAX3044CUE
0°C to +70°C
16 TSSOP
2.5Mbps
0°C to +70°C
16 Narrow SO
2.5Mbps
PIN-PACKAGE
MAX3041CSE
0°C to +70°C
16 Narrow SO
2.5Mbps
MAX3044CSE
MAX3041CWE
0°C to +70°C
16 Wide SO
2.5Mbps
MAX3044CWE
0°C to +70°C
16 Wide SO
2.5Mbps
2.5Mbps
MAX3044EUE
-40°C to +85°C
16 TSSOP
2.5Mbps
-40°C to +85°C
16 Narrow SO
2.5Mbps
-40°C to +85°C
MAX3041EUE
-40°C to +85°C
16 TSSOP
MAX3041ESE
-40°C to +85°C
16 Narrow SO
2.5Mbps
MAX3044ESE
MAX3041EWE
-40°C to +85°C
16 Wide SO
2.5Mbps
MAX3044EWE
16 Wide SO
2.5Mbps
20Mbps
MAX3045BCUE
0°C to +70°C
16 TSSOP
20Mbps
0°C to +70°C
16 Narrow SO
20Mbps
0°C to +70°C
MAX3042BCUE
0°C to +70°C
16 TSSOP
MAX3042BCSE
0°C to +70°C
16 Narrow SO
20Mbps
MAX3045BCSE
MAX3042BCWE
0°C to +70°C
16 Wide SO
20Mbps
MAX3045BCWE
16 Wide SO
20Mbps
20Mbps
MAX3045BEUE -40°C to +85°C
16 TSSOP
20Mbps
16 Narrow SO
20Mbps
16 Wide SO
20Mbps
MAX3042BEUE -40°C to +85°C
16 TSSOP
MAX3042BESE -40°C to +85°C
16 Narrow SO
20Mbps
MAX3045BESE -40°C to +85°C
MAX3042BEWE -40°C to +85°C
16 Wide SO
20Mbps
MAX3045BEWE -40°C to +85°C
MAX3043CUE
0°C to +70°C
16 TSSOP
250kbps
MAX3043CSE
0°C to +70°C
16 Narrow SO
250kbps
MAX3043EWE
0°C to +70°C
16 Wide SO
250kbps
MAX3043EUE
-40°C to +85°C
16 TSSOP
250kbps
MAX3043ESE
-40°C to +85°C
16 Narrow SO
250kbps
MAX3043EWE
-40°C to +85°C
16 Wide SO
250kbps
Pin Configurations (continued)
TOP VIEW
T1IN 1
16 VCC
Y1 2
15 T4IN
Z1 3
14 Y4
EN 4
Z2 5
MAX3043
MAX3044
MAX3045B
13 Z4
12 EN
Y2 6
11 Z3
T2IN 7
10 Y3
GND 8
9
16 TSSOP/SO
14
______________________________________________________________________________________
T3IN
±10kV ESD-Protected, Quad 5V RS-485/RS-422
Transmitters
SOICW.EPS
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 ____________________ 15
© 2001 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
MAX3040–MAX3045
Package Information (continued)