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MAX3280E/MAX3281E/
MAX3283E/MAX3284E
±15kV ESD-Protected 52Mbps, 3V to 5.5V,
SOT23 RS-485/RS-422 True Fail-Safe Receivers
General Description
Benefits and Features
The MAX3280E/MAX3281E/MAX3283E/MAX3284E
are single receivers designed for RS-485 and RS-422
communication. These devices guarantee data rates
up to 52Mbps, even with a 3V power supply. Excellent
propagation delay (15ns max) and package-to-package
skew time (8ns max) make these devices ideal for
multidrop clock distribution applications.
●● ESD Protection:
±15kV Human Body Model
±6kV IEC 1000-4-2, Contact Discharge
±12kV IEC 1000-4-2, Air-Gap Discharge
●● Guaranteed 52Mbps Data Rate
●● Guaranteed 15ns Receiver Propagation Delay
The MAX3280E/MAX3281E/MAX3283E/MAX3284E
have true fail-safe circuitry, which guarantees a logic-high
receiver output when the receiver inputs are opened
or shorted. The receiver output will be a logic high if
all transmitters on a terminated bus are disabled (high
impedance). These devices feature 1/4-unit-load receiver
input impedance, allowing up to 128 receivers on the
same bus.
●● Guaranteed 2ns Receiver Skew
The MAX3280E is a single receiver available in a 5-pin
SOT23 package. The MAX3281E/MAX3283E single
receivers have a receiver enable (EN or EN) function and
are offered in a 6-pin SOT23 package. The MAX3284E
features a voltage logic pin that allows compatibility with
low-voltage logic levels, as in digital FPGAs/ASICs. On
the MAX3284E, the voltage threshold for a logic high
is user-defined by setting VL in the range from 1.65V to
VCC. The MAX3284E is also offered in a 6-pin SOT23
package.
●● -7V to +12V Common-Mode Range
●● Guaranteed 8ns Package-to-Package Skew Time
●● VL Pin for Connection to FPGAs/ASICs
●● Allow Up to 128 Transceivers on the Bus
(1/4-unit-load)
●● Tiny SOT23 Package
●● True Fail-Safe Receiver
●● 3V to 5.5V Power-Supply Range
●● Enable (High and Low) Pins for Redundant Operation
●● Three-State Output Stage (MAX3281E/MAX3283E)
●● Thermal Protection Against Output Short Circuit
●● AEC-Q100 (MAX3280EAUK/V+ Only)
Ordering Information
PART
Applications
●●
●●
●●
●●
●●
TEMP RANGE
MAX3280EAUK+T
Clock Distribution
Telecom Racks
Base Stations
Industrial Control
Local Area Networks
Pin Configurations appear at end of data sheet.
PINPACKAGE
TOP
MARK
-40°C to +125°C 5 SOT23
+ADVM
MAX3280EAUK/V+T -40°C to +125°C 5 SOT23
+AFME
MAX3281EAUT+T
-40°C to +125°C 6 SOT23
+ABAT
MAX3283EAUT+T
-40°C to +125°C 6 SOT23
+ABAU
MAX3284EAUT+T
-40°C to +125°C 6 SOT23
+ABAV
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
/V denotes an automotive qualified part.
Selector Guide
PART
VL
ENABLE
DATA RATE
PACKAGE
MAX3280E
—
—
52Mbps
5-Pin SOT23
MAX3281E
—
Active High
52Mbps
6-Pin SOT23
MAX3283E
—
Active Low
52Mbps
6-Pin SOT23
MAX3284E
✔
—
52Mbps (Note 1)
6-Pin SOT23
Note 1: MAX3284E data rate is dependent on VL.
19-2320; Rev 5; 6/18
MAX3280E/MAX3281E/
MAX3283E/MAX3284E
±15kV ESD-Protected 52Mbps, 3V to 5.5V,
SOT23 RS-485/RS-422 True Fail-Safe Receivers
Absolute Maximum Ratings
(All Voltages Referenced to GND)
Supply Voltage (VCC)...............................................-0.3V to +6V
Control Input Voltage (EN, EN)................................-0.3V to +6V
VL Input Voltage.......................................................-0.3V to +6V
Receiver Input Voltage (A, B)..............................-7.5V to +12.5V
Receiver Output Voltage (RO).................. -0.3V to (VCC + 0.3V)
Receiver Output Voltage
(RO) (MAX3284E).................................... -0.3V to (VL + 0.3V)
Receiver Output Short-Circuit Current.......................Continuous
Continuous Power Dissipation (TA = +70°C)
5-Pin SOT23 (derate 3.9mW/°C above +70°C)......312.60mW
6-Pin SOT23 (derate 8.7mW/°C above +70°C)...........696mW
Operating Temperature Range
MAX328_EA__.............................................. -40°C to +125°C
Storage Temperature Range............................. -65°C to +150°C
Junction Temperature.......................................................+150°C
Lead Temperature (soldering, 10s).................................. +300°C
Soldering Temperature (reflow)........................................+260°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.
Package Information
SOT23-5
PACKAGE CODE
U5+2
Outline Number
21-0057
Land Pattern Number
90-0174
Thermal Resistance, Single-Layer Board:
Junction to Ambient (θJA)
324.30°C/W
Junction to Case (θJC)
82°C/W
Thermal Resistance, Multi-Layer Board:
Junction to Ambient (θJA)
255.90°C/W
Junction to Case (θJC)
81°C/W
SOT23-6
PACKAGE CODE
U6+1
Outline Number
21-0058
Land Pattern Number
90-0175
Thermal Resistance, Single-Layer Board:
Junction to Ambient (θJA)
N/A
Junction to Case (θJC)
80°C/W
Thermal Resistance, Multi-Layer Board:
Junction to Ambient (θJA)
115°C/W
Junction to Case (θJC)
80°C/W
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board.
For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
www.maximintegrated.com
Maxim Integrated │ 2
MAX3280E/MAX3281E/
MAX3283E/MAX3284E
±15kV ESD-Protected 52Mbps, 3V to 5.5V,
SOT23 RS-485/RS-422 True Fail-Safe Receivers
Electrical Characteristics
(VCC = 3V to 5.5V, VL = VCC, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 5V and TA = +25°C.) (Notes 2, 3)
PARAMETER
SYMBOL
CONDITIONS
Supply Voltage
VCC
Supply Current
ICC
No load
VL Input Range
VL
MAX3284E
VL Supply Current
IL
No load (MAX3284E)
Input Current (A and B)
IA, B
VCC = VGND or 5.5V
Receiver Differential Threshold
Voltage
VTH
-7V ≤ VCM ≤ +12V (Note 4)
MIN
TYP
3.0
9
1.65
MAX
UNITS
5.5
V
15
mA
VCC
V
10
µA
RECEIVER
VIN = +12V
250
VIN = -7V
-200
Receiver Input Hysteresis
∆VTH
VA + VB = 0V
Receiver Enable Input Low
VENIL
MAX3281E, MAX3283E only
Receiver Enable Input High
VENIH
MAX3281E, MAX3283E only
Receiver Enable Input Leakage
ILEAK
MAX3281E, MAX3283E only
Receiver Output High Voltage
Receiver Output Low Voltage
VOH
VOL
MAX3280E/MAX3281E/MAX3283E,
IOH = -4mA, RO high
-200
-125
-50
25
mV
V
±10
µA
2
V
VCC - 0.4
V
MAX3280E/MAX3281E/MAX3283E,
IOL = 4mA, RO low
0.4
MAX3284E, IOL = 1mA, 1.65V ≤ VL ≤ VCC,
RO low
0.4
±5
IOZR
0 ≤ VO ≤ VCC, RO = high impedance
Receiver Input Resistance
RIN
-7V ≤ VCM ≤ +12V (Note 5)
Receiver Output Short-Circuit
Current
IOSR
0 ≤ VRO ≤ VCC
mV
0.4
MAX3284E, IOH = -1mA, 1.65V ≤ VL ≤ VCC,
VL - 0.4
RO high
Three-State Output Current at
Receiver
µA
V
48
µA
kW
±130
mA
ESD PROTECTION
ESD Protection (A, B)
www.maximintegrated.com
Human Body Model
±15
IEC1000-4-2 (Air-Gap Discharge)
±12
IEC1000-4-2 (Contact Discharge)
±6
kV
Maxim Integrated │ 3
MAX3280E/MAX3281E/
MAX3283E/MAX3284E
±15kV ESD-Protected 52Mbps, 3V to 5.5V,
SOT23 RS-485/RS-422 True Fail-Safe Receivers
Switching Characteristics
(VCC = 3V to 5.5V, VL = VCC, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 5V and TA = +25°C.) (Notes 2, 3)
PARAMETER
SYMBOL
Maximum Data Rate
Receiver Propagation Delay
Receiver Output |tPLH - tPHL|
CONDITIONS
MIN
TYP
MAX
fMAX
CL = 15pF (Notes 5, 6)
tPLH
Figure 1, CL = 15pF, VID = 2V, VCM = 0V
7
15
tPHL
Figure 1, CL = 15pF, VID = 2V, VCM = 0V
8
15
tPSKEW
Device-to-Device Propagation
Delay Matching
UNITS
52
Mbps
ns
Figure 1, CL = 15pF, TA = +25°C
2
ns
Same power supply, maximum temperature
difference between devices = +30°C
(Note 5)
8
ns
ENABLE/DISABLE TIME FOR MAX3281E/MAX3283E
Receiver Enable to Output Low
tPRZL
Figure 2, CL = 15pF
500
ns
Receiver Enable to Output High
tPRZH
Figure 2, CL = 15pF
500
ns
Receiver Disable Time from Low
tPRLZ
Figure 2, CL = 15pF
500
ns
Receiver Disable Time from High
tPRHZ
Figure 2, CL = 15pF
500
ns
Note 2: Parameters are 100% production tested at +25°C, limits over temperature are guaranteed by design.
Note 3: 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 4: VCM is the common-mode input voltage. VID is the differential input voltage.
Note 5: Not production tested. Guaranteed by design.
Note 6: See Table 2 for MAX3284E data rates with VL < VCC.
Typical Operating Characteristics
(VCC = 3.3V, TA = +25°C, unless otherwise noted.)
3
VCC = 3.3V
VCC = 5V
2
1
0
VCC = 5V
3
VCC = 3.3V
2
1
0
10
20
30
40
OUTPUT CURRENT (mA)
www.maximintegrated.com
50
60
0
-50
-40
-30
-20
OUTPUT CURRENT (mA)
-10
0
5.0
MAX3280/1/3/4E toc03
4
MAX3280/1/3/4E toc02
4
5
OUTPUT VOLTAGE (V)
MAX3280/1/3/4E toc01
OUTPUT VOLTAGE (V)
5
RECEIVER OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
RECEIVER OUTPUT HIGH VOLTAGE
vs. OUTPUT CURRENT
RECEIVER OUTPUT HIGH VOLTAGE (V)
RECEIVER OUTPUT LOW VOLTAGE
vs. OUTPUT CURRENT
VCC = 5V
4.5
4.0
3.5
VCC = 3.3V
3.0
2.5
VA = 1V, B = GND, IOH = -4mA
-50
-25
0
25
50
75
100
125
TEMPERATURE (°C)
Maxim Integrated │ 4
MAX3280E/MAX3281E/
MAX3283E/MAX3284E
±15kV ESD-Protected 52Mbps, 3V to 5.5V,
SOT23 RS-485/RS-422 True Fail-Safe Receivers
Typical Operating Characteristics (continued)
(VCC = 3.3V, TA = +25°C, unless otherwise noted.)
RECEIVER PROPAGATION DELAY (tPLH)
vs. TEMPERATURE
8
VCC = 3.3V
6
50
0
9
VCC = 5V
tPHL (ns)
VCC = 5V
100
VCC = 5V
7
tPLH (ns)
VCC = 3.3V
10
MAX3280/1/3/4E toc05
150
9
MAX3280/1/3/4E toc04
RECEIVER OUTPUT LOW VOLTAGE (mV)
200
RECEIVER PROPAGATION DELAY (tPHL)
vs. TEMPERATURE
8
-50
-25
0
25
50
75
100
4
125
-50
-25
0
25
50
75
100
6
125
-50
-25
TEMPERATURE (°C)
TEMPERATURE (°C)
50
75
100
125
7
MAX3280/1/3/4E toc08
8
60
50
DATA RATE (Mbps)
VCC = 5V
25
MAX3284E MAXIMUM DATA RATE
vs. VOLTAGE LOGIC LEVEL
MAX3280/1/3/4E toc07
9
0
TEMPERATURE (°C)
SUPPLY CURRENT vs. TEMPERATURE
SUPPLY CURRENT (mA)
VCC = 3.3V
7
5
A = GND, VB = 1V, IOL = 4mA
MAX3280/1/3/4E toc06
RECEIVER OUTPUT LOW VOLTAGE
vs. TEMPERATURE
40
6
30
VCC = 3.3V
-50
-25
0
25
50
75
100
20
125
1.5
8
ICC, VCC = VL = 3.3V
6
IL, VCC = VL = 5V
4
1
0.1
VCC = VL = 5V
DATA RATE = 100kbps
0.01
VCC = VL = 3.3V
DATA RATE = 100kbps
IL, VCC = VL = 3.3V
0.001
10
100
1000
10,000
DATA RATE (kbps)
www.maximintegrated.com
5.5
VCC = VL = 5V
DATA RATE = 52Mbps VCC = VL = 3.3V
DATA RATE = 52Mbps
2
0
4.5
10
VL SUPPLY CURRENT (mA)
MAX3280/1/3/4E toc09
SUPPLY CURRENT (mA)
ICC, VCC = VL = 5V
3.5
VL SUPPLY CURRENT
vs. TEMPERATURE
SUPPLY CURRENT vs. DATA RATE
10
2.5
VOLTAGE LOGIC LEVEL (V)
TEMPERATURE (°C)
100,000
MAX3280/1/3/4 toc10
5
-50
-25
0
25
50
75
100
125
TEMPERATURE (°C)
Maxim Integrated │ 5
MAX3280E/MAX3281E/
MAX3283E/MAX3284E
±15kV ESD-Protected 52Mbps, 3V to 5.5V,
SOT23 RS-485/RS-422 True Fail-Safe Receivers
Pin Description
PIN
MAX3280E
MAX3281E MAX3283E MAX3284E
NAME
FUNCTION
1
1
1
1
VCC
Positive Supply: 3V ≤ VCC ≤ 5.5V. Bypass with a 0.1µF
capacitor to GND.
2
2
2
2
GND
Ground
3
3
3
3
RO
4
4
4
4
B
—
—
5
—
EN
Receiver Output Enable. Drive EN low to enable RO. When
EN is high, RO is high impedance.
—
5
—
—
EN
Receiver Output Enable. Drive EN high to enable RO. When
EN is low, RO is high impedance.
—
—
—
5
VL
Low-Voltage Logic-Level Supply Voltage. VL is a user-defined
voltage, ranging from 1.65V to VCC. RO output high is pulled
up to VL. Bypass with a 0.1µF capacitor to GND.
5
6
6
6
A
Noninverting Receiver Input
Detailed Description
The MAX3280E/MAX3281E/MAX3283E/MAX3284E are
single, true fail-safe receivers designed to operate at data
rates up to 52Mbps. The fail-safe architecture guarantees
a high output signal if both input terminals are open or
shorted together. See the True Fail-Safe section. This
feature assures a stable and predictable output logic state
with any transmitter driving the line. These receivers function with a 3.3V or 5V supply voltage and feature excellent
propagation delay times (15ns).
The MAX3280E is a single receiver available in a 5-pin
SOT23 package. The MAX3281E (EN, active high) and
MAX3283E (EN, active low) are single receivers that
also contain an enable pin. Both the MAX3281E and
MAX3283E are available in a 6-pin SOT23 package. The
MAX3284E is a single receiver that contains a VL pin,
which allows communication with low-level logic included
in digital FPGAs. The MAX3284E is available in a 6-pin
SOT23 package.
The MAX3284E’s low-level logic application allows users
to set the logic levels. A logic high level of 1.65V will limit
the maximum data rate to 20Mbps.
±15kV ESD Protection
ESD-protection structures are incorporated on the
receiver input pins to protect against ESD encountered
during handling and assembly. The MAX3280E/
MAX3281E/MAX3283E/MAX3284E receiver inputs (A,
B) have extra protection against static electricity found
in normal operation. Maxim’s engineers developed
state-of-the-art structures to protect these pins against
www.maximintegrated.com
Receiver Output. RO will be high if (VA - VB) ≥ -50mV. RO will
be low if (VA - VB) ≤ -200mV.
Inverting Receiver Input
±15kV ESD without damage. After an ESD event, this
family of parts continues working without latchup.
ESD protection can be tested in several ways. The
receiver inputs are characterized for protection to the
following:
●● ±15kV using the Human Body Model
●● ±6kV using the Contact Discharge method specified
in IEC 1000-4-2 (formerly IEC 801-2)
●● ±12kV using the Air-Gap Discharge method specified
in IEC 1000-4-2 (formerly IEC 801-2)
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 3a shows the Human Body Model, and Figure
3b shows the current waveform it generates when discharged into a 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.
IEC 1000-4-2
Since January 1996, all equipment manufactured
and/or sold in the European community has been
required to meet the stringent IEC 1000-4-2 specification. The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment; it does
not specifically refer to integrated circuits. The
MAX3280E/MAX3281E/MAX3283E/MAX3284E help
Maxim Integrated │ 6
MAX3280E/MAX3281E/
MAX3283E/MAX3284E
±15kV ESD-Protected 52Mbps, 3V to 5.5V,
SOT23 RS-485/RS-422 True Fail-Safe Receivers
users design equipment that meets Level 3 of IEC 10004-2, without additional ESD-protection components.
The main difference between tests done using the Human
Body Model and IEC 1000-4-2 is higher peak current
in IEC 1000-4-2. Because series resistance is lower in
the IEC 1000-4-2 ESD test model (Figure 4a), the ESDwithstand voltage measured to this standard is generally
lower than that measured using the Human Body Model.
Figure 4b shows the current waveform for the ±8kV IEC
1000-4-2 Level 4 ESD Contact Discharge test. The AirGap test involves approaching the device with a charger
probe. The Contact Discharge method connects the
probe to the device before the probe is energized.
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. All pins (not just the 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 and IEC 1000-4-2.
True Fail-Safe
The MAX3280E/MAX3281E/MAX3283E/MAX3284E guarantee a logic-high receiver output when the receiver inputs
are shorted or open, or when they are connected to a
terminated transmission line with all drivers disabled. This
guaranteed logic high is achieved by setting the receiver
threshold between -50mV and -200mV. If the differential
receiver input voltage (VA - VB) is greater than or equal to
-50mV, RO is logic high. If (VA - VB) is less than or equal
to -200mV, RO is logic low.
In the case of a terminated bus with all transmitters disabled, the receiver’s differential input voltage is pulled to
ground by the termination. This results in a logic high with
a 50mV minimum noise margin. Unlike previous fail-safe
devices, the -50mV to -200mV threshold complies with
the ±200mV EIA/TIA-485 standard.
Receiver Enable
(MAX3281E and MAX3283E only)
The MAX3281E and MAX3283E feature a receiver output enable (EN, MAX3281E or EN, MAX3283E) input
that controls the receiver. The MAX3281E receiver
enable (EN) pin is active high, meaning the receiver
outputs are active when EN is high. The MAX3283E
receiver enable (EN) pin is active low. Receiver outputs
are high impedance when the MAX3281E’s EN pin is low
and when the MAX3283E’s EN pin is high.
www.maximintegrated.com
Table 1. MAX3281E/MAX3283E Enable
Table
PART
ENABLE = HIGH
ENABLE = LOW
MAX3281E
Active
High Z
MAX3283E
High Z
Active
Low-Voltage Logic Levels
(MAX3284E only)
An increasing number of applications now operate at
low-voltage logic levels. To enable compatibility with
these low-voltage logic level applications, such as digital
FPGAs, the MAX3284E VL pin is a user-defined supply
voltage that designates the voltage threshold for a logic
high.
At lower VL voltages, the data rate will also be lower.
A logic-high level of 1.65V will receive data at 20Mbps.
Table 2 gives data rates at various voltages at VL.
Table 2. MAX3284E Data Rate Table
VCC = 3V TO 5.5V
VL
MAXIMUM DATA RATE
1.65V
20Mbps
2.2V
33Mbps
≥3.3V
52Mbps
Applications Information
Propagation Delay Matching
The MAX3280E/MAX3281E/MAX3283E/MAX3284E (VCC
= VL) exhibit propagation delays that are closely matched
from one device to another, even between devices from
different production lots. This feature allows multiple data
lines to receive data and clock signals with minimal skew
with respect to each other. Figure 5 shows the typical
propagation delays. Small receiver skew times, the difference between the low-to-high and high-to-low propagation
delay, help maintain a symmetrical ratio (50% duty cycle).
The receiver skew time | tPLH - tPHL | is under 2ns for
either a 3.3V supply or a 5V supply.
Multidrop Clock Distribution
Low package-to-package skew (8ns max) makes the
MAX3280E/MAX3281E/MAX3283E/MAX3284E
(VCC = VL) ideal for multidrop clock distribution. When
distributing a clock signal to multiple circuits over long
transmission lines, receivers in separate locations, and
possibly at two different temperatures, would ideally
Maxim Integrated │ 7
MAX3280E/MAX3281E/
MAX3283E/MAX3284E
±15kV ESD-Protected 52Mbps, 3V to 5.5V,
SOT23 RS-485/RS-422 True Fail-Safe Receivers
provide the same clock to their respective circuits.
Thus, minimal package-to-package skew is critical. The
skew must be kept well below the period of the clock
signal to ensure that all of the circuits on the network
are synchronized.
128 Receivers on the Bus
The standard RS-485 input impedance is 12kΩ (oneunit load). The standard RS-485 transmitter can drive
32 unit loads. The MAX3280E/MAX3281E/MAX3283E/
MAX3284E present a 1/4-unit-load input impedance
(48kΩ), which allows up to 128 receivers on the bus.
Any combination of these RS-485 receivers with a total
of 32 unit loads can be connected to the same bus.
Thermal Protection
The MAX3280E/MAX3281E/MAX3283E/MAX3284E feature thermal protection. Thermal protection sets the output stage in high-impedance mode when a short circuit
occurs at the output, limiting both the power dissipation
and temperature. The thermal temperature threshold is
+165°C, with a hysteresis of 20°C.
Test Circuits/Timing Diagrams
RO
VOH
VCC/2
VOL
1V
A
-1V
B
VCC/2
OUTPUT
tPLH
tPHL
INPUT
fIN = 1MHz
tr, tf 3ns
Figure 1. Receiver Propagation Delay
S3
1.5V
S1
-1.5V
VID
VCC
1kΩ
R
S2
CL
GENERATOR
50Ω
VCC
VCC/2
0
EN
VCC
S1 OPEN
S2 CLOSED
S3 = 1.5V
VCC/2
0
EN
tPRZH
tPRZL
VOH
OUT
VCC
VCC/2
VCC/2
OUT
0
VOL
VCC
VCC
VCC/2
EN
0
S1 OPEN
S2 CLOSED
S3 = 1.5V
VCC/2
0.25V
tPRLZ
VOH
OUT
FOR MAX3281E THE ENABLE SIGNAL IS INVERTED.
0
0
EN
tPRHZ
OUT
S1 CLOSED
S2 OPEN
S3 = -1.5V
0.25V
S1 CLOSED
S2 OPEN
S3 = -1.5V
VCC
VOL
Figure 2. MAX3281E/MAX3283E Receiver Enable/Disable Timing
www.maximintegrated.com
Maxim Integrated │ 8
MAX3280E/MAX3281E/
MAX3283E/MAX3284E
±15kV ESD-Protected 52Mbps, 3V to 5.5V,
SOT23 RS-485/RS-422 True Fail-Safe Receivers
Test Circuits/Timing Diagrams (continued)
RC
1MΩ
RD
1.5kΩ
Cs
100pF
Figure 3a. Human Body ESD Test Model
HIGHVOLTAGE
DC
SOURCE
36.8%
10%
0
TIME
tRL
tDL
CURRENT WAVEFORM
I
100%
90%
DISCHARGE
RESISTANCE
Cs
150pF
0
Figure 3b. Human Body Model Current Waveform
RD
330Ω
CHARGE-CURRENT
LIMIT RESISTOR
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
AMPERES
DEVICE
UNDER
TEST
STORAGE
CAPACITOR
RC
50Ω to 100Ω
Ir
DEVICE
UNDER
TEST
STORAGE
CAPACITOR
I PEAK
HIGHVOLTAGE
DC
SOURCE
IP 100%
90%
DISCHARGE
RESISTANCE
CHARGE-CURRENT
LIMIT RESISTOR
10%
Figure 4a. IEC 1000-4-2 ESD Test Model
t r = 0.7ns to 1ns
t
30ns
60ns
Figure 4b. IEC 1000-4-2 ESD Generator Current Waveform
A, 1V/div
RO, 2.5V/div
B = GND
10ns
Figure 5. Receiver Propagation Delay Driven by External
RS-485 Device
www.maximintegrated.com
Maxim Integrated │ 9
MAX3280E/MAX3281E/
MAX3283E/MAX3284E
±15kV ESD-Protected 52Mbps, 3V to 5.5V,
SOT23 RS-485/RS-422 True Fail-Safe Receivers
Pin Configurations
TOP VIEW
+
+
VCC 1
GND 2
5
A
MAX3280E
GND 2
RO 3
4
+
VCC 1
B
MAX3281E
MAX3283E
RO 3
SOT23-5
6
A
VCC 1
5
EN (EN)
GND 2
4
B
MAX3284E
RO 3
SOT23-6
6
A
5
VL
4
B
SOT23-6
( ) ARE FOR MAX3283E
Typical Operating Circuit
Chip Information
PROCESS: BiCMOS
TRANSMITTER
DATA IN
120Ω
MAX3283E
RO1
Package Information
EN
MAX3281E
MAX3281E/MAX3283E IN REDUNDANT
RECEIVER APPLICATION
EN
www.maximintegrated.com
RO2
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
5 SOT23
U5+2
21-0057
90-0174
6 SOT23
U6+1
21-0058
90-0175
Maxim Integrated │ 10
MAX3280E/MAX3281E/
MAX3283E/MAX3284E
±15kV ESD-Protected 52Mbps, 3V to 5.5V,
SOT23 RS-485/RS-422 True Fail-Safe Receivers
Revision History
PAGES
CHANGED
REVISION
NUMBER
REVISION
DATE
0
1/02
Initial release
1
3/11
Added lead-free parts to the Ordering Information, deleted the transistor count from the
Chip Information section
2
12/12
Added automotive qualified part to Ordering Information table
1
3
9/17
Added AEC-Q100 (MAX3280EAUK/V+ Only) to Benefits and Features section
1
4
5/18
Updated Absolute Maximum Ratings and added Package Information section
2
5
6/18
Updated Package Information section
2
DESCRIPTION
—
1, 9
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
© 2018 Maxim Integrated Products, Inc. │ 11
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