XR3072X / XR3078X
Data Sheet
Low Power, 18V Tolerant,
3.3V RS-485 / RS-422 Transceivers
General Description
Features
The XR3072X and XR3078X high performance RS-485 /
RS-422 devices are designed for improved performance in
noisy industrial environments and increased tolerance to
system faults.
■
The analog bus pins can withstand direct shorts up to ±18V,
and are protected against ESD events up to ±15kV. The
differential high output driver delivers 10% higher SNR than
standard RS-485 / RS-422 devices, affording additional noise
margin or extended cable lengths.
■
■
The receivers include full fail-safe circuitry, guaranteeing a
logic-high receiver output when the receiver inputs are open,
shorted or undriven. The receiver input impedance is at
minimum 96kΩ (1/8 unit load), allowing up to 256 devices on
the bus while preserving the full signal margin.
■
■
■
The drivers are protected by short circuit detection as well as
thermal shutdown, and maintain high impedance in shutdown
or when powered off. The XR3072X drivers are slew limited
for reduced EMI and error-free communication over long or
unterminated data cables.
■
■
The devices with DE and RE pins include hot swap circuitry
to prevent false transitions on the bus during powerup or live
insertion, and can enter a 1nA low current shutdown mode for
extreme power savings.
The transceivers draw less than 600µA from a 3.3V supply,
and typically only 300µA when idling with the receivers
active.
■
■
■
10% higher SNR (Signal-to-Noise Ratio) compared to
other RS-485 devices (1.65V vs. 1.5V)
±18V fault tolerance on analog bus pins
Robust ESD (ElectroStatic Discharge) protection:
±15kV IEC 61000-4-2 Air Gap Discharge
±8kV IEC 61000-4-2 Contact Discharge
±15kV Human Body Model
±4kV Human Body Model on non-bus pins
3.0V to 3.6V operation (3.3V ± 10%)
300µA idle current, 1nA shutdown current
Enhanced receiver fail-safe protection for open, shorted
or terminated but idle data lines
Hot-swap glitch protection on DE and RE pins
Driver short circuit current limit and thermal shutdown for
overload protection
1/8th unit load allows up to 256 devices on bus
Industrial operating temperature range (-40°C to 85°C)
Industry standard 8- and 14 -pin NSOIC packages
Applications
■
■
■
■
■
■
Motor control
Security systems
Building and process automation
Remote utility meter reading
Energy monitoring and control
Long or unterminated transmission lines
Ordering Information - page 15
Product Selector Guide
Table 1: Selector Guide
Part Number
Duplex
Data Rate
Shutdown
Receiver and Driver Enable
Transceivers on Bus
Footprint
XR3072XIDTR-F
Half
250kbps
Yes
Yes
256
SN75176
XR3078XIDTR-F
Half
20Mbps
Yes
Yes
256
SN75176
• www.maxlinear.com•
XR3072X / XR3078X 3.3V RS-485 / RS-422 Transceivers Data Sheet
Revision History
Revision History
Document No.
Release Date
Change Description
1.0.0
Sept 2013
Production release.
1.0.1
Dec 2013
Updated typical driver differential rise / fall time, page 7.
1.0.2
May 2015
1.0.3
8/30/19
8/30/19
Added extended temp range -40°C to 125°C part numbers, updated ISHDN for industrial
and extended temp range, updated ordering information table and table #7.
ECN# 1525-07.
Update to MaxLinear format, update Ordering Information and move to page 15. Move ESD
Ratings to below Absolute Maximum Ratings section, Pinout and Block Diagram to Pin
Information section, and Product Selector Guide to first page. Remove obsolete products:
XR3070X, XR3071X, XR3073X, XR3074X, XR3075X, XR3076X and XR3077X.
ii
XR3072X / XR3078X Low Power, 18V Tolerant, Data Sheet
Table of Contents
Table of Contents
General Description............................................................................................................................................. i
Features............................................................................................................................................................... i
Applications ......................................................................................................................................................... i
Product Selector Guide....................................................................................................................................... i
Specifications ..................................................................................................................................................... 1
Absolute Maximum Ratings...........................................................................................................................................1
ESD Ratings ..................................................................................................................................................................1
Electrical Characteristics ...............................................................................................................................................2
Test Circuits and Timing Diagrams................................................................................................................... 5
Pin Information ................................................................................................................................................. 10
Pin Configuration and Block Diagram .........................................................................................................................10
Pin Descriptions ..........................................................................................................................................................10
Product Description ......................................................................................................................................... 11
Enhanced Fail-Safe .................................................................................................................................................... 11
Receiver Input Filtering .............................................................................................................................................. 11
Hot-Swap Capability ................................................................................................................................................... 11
Driver Output Protection ............................................................................................................................................. 11
Line Length................................................................................................................................................................. 11
±15kV ESD Protection................................................................................................................................................ 12
ESD Test Conditions .................................................................................................................................................. 12
IEC 61000-4-2 ............................................................................................................................................................ 12
256 Transceivers on the Bus...................................................................................................................................... 12
Low Power Shutdown Mode....................................................................................................................................... 12
Function Tables ................................................................................................................................................ 13
Mechanical Dimensions ................................................................................................................................... 14
NSOIC8 ....................................................................................................................................................................... 14
Ordering Information........................................................................................................................................ 15
8/30/19
iii
XR3072X / XR3078X Low Power, 18V Tolerant, Data Sheet
List of Figures
List of Figures
Figure 1: Differential Driver Output Voltage.......................................................................................................... 5
Figure 2: Differential Driver Output Voltage Over Common Mode ....................................................................... 5
Figure 3: Driver Output Short Circuit Current ....................................................................................................... 5
Figure 4: Transient Overvoltage Test Circuit ........................................................................................................ 6
Figure 5: Driver Propagation Delay Test Circuit and Timing Diagram.................................................................. 6
Figure 6: Driver Enable and Disable Timing Test Circuits and Timing Diagrams................................................. 7
Figure 7: Receiver Propagation Delay Test Circuit and Timing Diagram ............................................................. 8
Figure 8: Receiver Enable and Disable Test Circuits and Timing Diagrams ........................................................ 9
Figure 9: Pin Configuration and Half-Duplex Block Diagram.............................................................................. 10
Figure 10: Mechanical Dimension, NSOIC8 ....................................................................................................... 14
8/30/19
iv
XR3072X / XR3078X Low Power, 18V Tolerant, Data Sheet
List of Tables
List of Tables
Table 1: Selector Guide ......................................................................................................................................... i
Table 1: Absolute Maximum Ratings .................................................................................................................... 1
Table 2: ESD Ratings ........................................................................................................................................... 1
Table 3: Electrical Characteristics ....................................................................................................................... 2
Table 4: Pin Descriptions.................................................................................................................................... 10
Table 5: Half Duplex Transmitting ...................................................................................................................... 13
Table 6: Half Duplex Receiving .......................................................................................................................... 13
Table 7: Ordering Information............................................................................................................................. 15
8/30/19
v
XR3072X / XR3078X 3.3V RS-485 / RS-422 Transceivers Data Sheet
Specifications
Specifications
Absolute Maximum Ratings
Important: These are stress ratings only and functional operation of the device at these ratings or any other above those
indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating
conditions for extended periods of time may affect reliability and cause permanent damage to the device.
Table 1: Absolute Maximum Ratings
Parameter
Minimum
Maximum
Units
VCC
–0.3
7.0
V
Input voltage at control and driver input (RE, DE and DI)
–0.3
7.0
V
Receiver output voltage (RO)
–0.3
VCC + 0.3
V
Driver output voltage (A, B, Y & Z)
–18
18
V
Receiver input voltage (A, B)
–18
18
V
Transient voltage pulse, through 100Ω, Figure 5
–70
70
V
Driver output current
–250
250
mA
Storage temperature range
–65
150
°C
300
°C
Lead temperature (soldering, 10s)
Package Power Dissipation
8-pin SO, ѲJA = 128.4°C/W
14-pin SO, ѲJA = 86°C/W
Maximum junction temperature = 150°C
ESD Ratings
Table 2: ESD Ratings
Parameter
Limit
Units
HBM - Human Body Model (pins A, B, Y & Z)
±15
kV
HBM - Human Body Model (all other pins)
±4
kV
IEC 1000-4-2 Airgap Discharge (pins A, B, Y & Z)
±15
kV
IEC 1000-4-2 Contact Discharge (pins A, B, Y & Z)
±8
kV
Caution:
ESD (Electrostatic Discharge) sensitive device. Permanent damage may occur on unconnected devices subject to high
energy electrostatic fields. Unused devices must be stored in conductive foam or shunts. Personnel should be properly
grounded prior to handling this device. The protective foam should be discharged to the destination socket before devices
are removed.
8/30/19
1
XR3072X / XR3078X 3.3V RS-485 / RS-422 Transceivers Data Sheet
Electrical Characteristics
Electrical Characteristics
Unless otherwise noted, VCC = 3.3V ±10%, TA = TMIN to TMAX. Typical values are at VCC = 3.3V, TA = 25°C.
Table 3: Electrical Characteristics
Parameter
Symbol
Test Condition
Minimum Typical Maximum
Units
Driver DC Characteristics
VCC
Supply voltage range
VOD
Differential Driver Output
Change in magnitude of differential
output voltage
DVOD
Driver common mode output voltage
(steady state)
VCM
Change in magnitude of commonmode output voltage
Logic input thresholds (DI, DE, RE)
3.0
3.6
No load
3
VCC
RL = 100 (RS-422), Figure 2
2
VCC
RL = 54 (RS-485), Figure 2
1.65
VCC
–7V ≤ VCM ≤ 12V, Figure 3
1.5
VCC
RL = 54Ω (RS-485) or
VCC/2
RL = 100Ω (RS-422), Figure 2(1)
DVCM
VIH
Logic input high
VIL
Logic input low
Logic input current (DI, DE, RE)
Logic input current (DE and RE)
IIN
IA,B
Input Current (A and B)
Driver short-circuit output current
V
3
V
±0.2
V
V
0.8
100
0V ≤ VIN ≤ VCC, after first transition(2)
Until first transition(2)
100
VOUT = 12V, DE = 0V,
VCC = 0V or 5.5V
VOUT = –7V, DE = 0V,
VCC = 0V or 5.5V
IOSD
–7V ≤ VOUT ≤ 12V, Figure 4
TTS
Junction temperature(4)
V
±0.2
2
VHYS
Input hysteresis (DI, DE, RE)
V
V
mV
±1
µA
±200
µA
125
µA
–100
±250
mA
Driver Thermal Characteristics
Thermal shutdown threshold
(4)
Thermal shutdown hysteresis
TTSH
175
°C
15
°C
Receiver DC Characteristics
Receiver differential threshold
voltage (VA - VB)
VTH
–7V ≤ VCM ≤ 12V
–200
-125
-50
mV
DVOH
VCM = 0V
Receiver output high voltage (RO)
VOH
IO = –1mA
Receiver output low voltage (RO)
VOL
IO = 1mA
0.4
V
High-Z receiver output current
IOZR
0 ≤ VOUT ≤ VCC
±1
µA
Receiver input resistance
RIN
–7V ≤ VCM ≤ 12V
Receiver output short-circuit current
IOSC
0V ≤ VRO ≤ VCC
Receiver input hysteresis
8/30/19
25
mV
VCC - 0.6
V
96
kΩ
±80
mA
2
XR3072X / XR3078X 3.3V RS-485 / RS-422 Transceivers Data Sheet
Electrical Characteristics
Table 3: Electrical Characteristics (Continued)
Parameter
Symbol
Test Condition
Minimum Typical Maximum
Units
Supply Current
Supply current
Supply current in shutdown mode
ICC
ISHDN
No load, RE = 0V, DE = VCC, DI = 0V
425
600
No load, RE = VCC, DE = VCC DI = 0V
330
600
No load, RE = 0V, DE = 0V
Receiver A and B inputs open
300
500
0.001
1
µA
250
1500
ns
250
1500
ns
200
ns
1600
ns
RE = VCC, DE = 0V
µA
Driver AC Characteristics - XR3072X (250kbps)
Driver propagation delay
(low to high)
tDPLH
Driver propagation delay
(high to low)
tDPHL
Differential driver output skew
Driver differential output rise or fall
time
|tDPLH - tDPHL|
tDR, tDF
Driver enable to output high
tDZH
Driver enable to output low
tDZL
Driver disable from output high
tDHZ
Driver disable from output low
tDLZ
Driver enable from shutdown to
output high
tDZH(SHDN)
Driver enable from shutdown to
output low
tDZL(SHDN)
20
350
1/tUI, duty cycle 40% to 60%
Maximum data rate
Time to shutdown(3, 4)
CL = 50pF, RL = 54Ω, Figure 6
250
CL = 50pF, RL = 500Ω, Figure 7
kbps
200
2500
ns
200
2500
ns
6
100
ns
6
100
ns
5500
ns
5500
ns
600
ns
200
ns
200
ns
30
ns
CL = 50pF, RL = 500Ω, Figure 7
tSHDN
50
200
Receiver AC Characteristics - XR3072X (250kbps)
Receiver propagation delay (low to
high)
tRPLH
Receiver propagation delay (high to
low)
tRPHL
Propagation delay skew
1/tUI, duty cycle 40% to 60%
Receiver enable to output high
tRZH
Receiver enable to output low
tRZL
Receiver disable from output high
tRHZ
Receiver disable from output low
tRLZ
Receiver enable from shutdown to
output high
tRZH(SHDN)
Receiver enable from shutdown to
output low
tRZL(SHDN)
8/30/19
VID rise and fall times < 15ns Figure 8
tRPLH - tRPHL
Maximum data rate
Time to shutdown(3, 4)
CL = 15pF, VID = ±2V,
tSHDN
250
kbps
CL = 15pF, RL = 1kΩ, Figure 9
CL = 15pF, RL = 1kΩ, Figure 9
50
200
50
ns
50
ns
50
ns
50
ns
3500
ns
3500
ns
600
ns
3
XR3072X / XR3078X 3.3V RS-485 / RS-422 Transceivers Data Sheet
Electrical Characteristics
Table 3: Electrical Characteristics (Continued)
Parameter
Symbol
Test Condition
Minimum Typical Maximum
Units
Driver AC Characteristics - XR3078X (20Mbps)
Driver propagation delay
(low to high)
tDPLH
Driver propagation delay
(high to low)
tDPHL
Differential driver output skew
Driver differential output rise or fall
time
|tDPLH - tDPHL|
tDR, tDF
Driver enable to output high
tDZH
Driver enable to output low
tDZL
Driver disable from output high
tDHZ
Driver disable from output low
tDLZ
Driver enable from shutdown to
output high
tDZH(SHDN)
Driver enable from shutdown to
output low
tDZL(SHDN)
ns
25
ns
5
ns
12
1/tUI, duty cycle 40% to 60%
Maximum data rate
Time to shutdown(3, 4)
CL = 50pF, RL = 54Ω, Figure 6
25
20
Mbps
CL = 50pF, RL = 500Ω, Figure 7
CL = 50pF, RL = 500Ω, Figure 7
tSHDN
ns
50
200
45
ns
45
ns
40
ns
40
ns
250
ns
250
ns
600
ns
50
ns
50
ns
5
ns
Receiver AC Characteristics - XR3078X (20Mbps)
Receiver propagation delay (low to
high)
tRPLH
Receiver propagation delay (high to
low)
tRPHL
Propagation delay skew
VID rise and fall times < 15ns Figure 8
|tRPLH - tRPHL|
1/tUI, duty cycle 40% to 60%
Maximum data rate
Receiver enable to output high
tRZH
Receiver enable to output low
tRZL
Receiver disable from output high
tRHZ
Receiver disable from output low
tRLZ
Receiver enable from shutdown to
output high
tRZH(SHDN)
Receiver enable from shutdown to
output low
tRZL(SHDN)
Time to shutdown(3, 4)
CL = 15pF, VID = ±2V,
20
Mbps
CL = 15pF, RL = 1kΩ, Figure 9
CL = 15pF, RL = 1kΩ, Figure 9
tSHDN
50
200
30
ns
30
ns
30
ns
30
ns
1800
ns
1800
ns
600
ns
1. Change in magnitude of differential output voltage and change in magnitude of common mode output voltage are the changes in output voltage when
DI input changes state.
2. The hot swap feature disables the DE and RE inputs for the first 10µs after power is applied. Following this time period these inputs are weakly pulled
to their disabled state (low for DE, high for RE) until the first transition, after which they become high impedance inputs.
3. The transceivers are put into shutdown by bringing RE high and DE low simultaneously for at least 600ns. If the control inputs are in this state for less
than 50ns, the device is guaranteed to not enter shutdown. If the enable inputs are held in this state for at least 600ns, the device is assured to be in
shutdown. Note that the receiver and driver enable times increase significantly when coming out of shutdown.
4. This spec is guaranteed by design and bench characterization.
8/30/19
4
XR3072X / XR3078X 3.3V RS-485 / RS-422 Transceivers Data Sheet
Switching Characteristics
Test Circuits and Timing Diagrams
Z
RL
2
DI = 0V or VCC
D
VOD
VCM
RL
2
Y
DE = VCC
Figure 2: Differential Driver Output Voltage
Z
375Ω
DI = 0V or VCC
D
VOD
VCM
60Ω
375Ω
Y
DE = VCC
Figure 3: Differential Driver Output Voltage Over Common Mode
Z
DI = 0V or VCC
IOSD
D
-7V to +12V
DE = 0V or VCC
V
Y
Figure 4: Driver Output Short Circuit Current
8/30/19
5
XR3072X / XR3078X 3.3V RS-485 / RS-422 Transceivers Data Sheet
Switching Characteristics
Device powered on or powered off
A or Z
Transceiver,
Generator, or
Receiver
100
VTEST
15us duration
15 duty cycle
B or Y
Figure 5: Transient Overvoltage Test Circuit
DI
3V
1.5V
0V
Z
1.5V
tDPLH
tSKEW = |tDPHL – tDPLH|
tDPHL
VOD
VOD
(VY - VZ)
Y
VOD+
0V
VOD-
90%
90%
10%
10%
tDR
tDF
Z
DI
D
DE = VCC
VOD
RL
CL
Y
Figure 6: Driver Propagation Delay Test Circuit and Timing Diagram
8/30/19
6
XR3072X / XR3078X 3.3V RS-485 / RS-422 Transceivers Data Sheet
Switching Characteristics
Z
Testing Z: DI = 0V
VOUT
D
Testing Y: DI = VCC
RL
DE
CL
Y
3V
DE
1.5V
1.5V
0V
tDZH
VOH
tDHZ
VOH + VOL
2
VOUT
VOH - 0.25V
VOL
VCC
Z
RL
Testing Z: DI = VCC
VOUT
D
Testing Y: DI = 0V
CL
DE
Y
3V
DE
1.5V
1.5V
0V
tDZL
VOH
VOUT
VOL
VOH + VOL
2
tDLZ
VOL + 0.25V
Figure 7: Driver Enable and Disable Timing Test Circuits and Timing Diagrams
8/30/19
7
XR3072X / XR3078X 3.3V RS-485 / RS-422 Transceivers Data Sheet
Test Circuits and Timing Diagrams
B
RO
R
CL
A
RE = 0V
B
+1V
0V
-1V
A
tRPLH
tRPHL
VOH
1.5V
RO
1.5V
VOL
Figure 8: Receiver Propagation Delay Test Circuit and Timing Diagram
8/30/19
8
XR3072X / XR3078X 3.3V RS-485 / RS-422 Transceivers Data Sheet
Test Circuits and Timing Diagrams
B
RO
R
RE
A
RL
CL
3V
RE
1.5V
1.5V
0V
tRZH
VA = VCC
VB = 0V
VOH
tRHZ
VOH
2
RO
VOH - 0.25V
0V
VCC
B
RL
RO
R
CL
RE
A
3V
RE
1.5V
1.5V
0V
tRZL
VA = 0V
VB = VCC
VCC
RO
VCC + VOL
2
tRLZ
VOL + 0.25V
VOL
Figure 9: Receiver Enable and Disable Test Circuits and Timing Diagrams
8/30/19
9
XR3072X / XR3078X 3.3V RS-485 / RS-422 Transceivers Data Sheet
Pin Information
Pin Information
Pin Configuration and Block Diagram
RO
1
RE
R
8
VCC
2
7
B/Z
DE
3
6
A/Y
DI
4
5
GND
D
Figure 10: Pin Configuration and Half-Duplex Block Diagram
Pin Descriptions
Table 4: Pin Descriptions
Pin Number
Pin Name
Type
Pin Function
1
RO
Out
Receiver output. When RE is low and if (A-B) ≤ -50mV, RO is High. If (A-B) ≥ -200mV,
RO is low.
2
RE
In
Receiver output enable (Hot swap). When RE is low, RO is enabled. When RE is
high, RO is high impedance. RE should be high and DE should be low to enter
shutdown mode.
3
DE
In
Driver output enable (Hot swap). When DE is high, outputs are enabled. When DE is
low, outputs are high impedance. DE should be low and RE should be high to enter
shutdown mode.
4
DI
In
Driver input. With DE high, a low level on DI forces non-inverting output low and
inverting output high. Similarly, a high level on DI forces non-inverting output high and
inverting output low.
5
GND
Pwr
Ground.
6
A
I/O
Non-inverting receiver input and non-inverting driver output.
7
B
I/O
Inverting receiver input and inverting driver output.
8
VCC
Pwr
3.3V positive supply input. Bypass to GND with a 0.1µF capacitor.
8/30/19
10
XR3072X / XR3078X 3.3V RS-485 / RS-422 Transceivers Data Sheet
Product Description
Product Description
The XR3072X and XR3078X RS-485 / RS-422 devices are
part of MaxLInear’s X Series high performance serial
interface product line. The analog bus pins can survive
direct shorts up to ±18V, and are protected against ESD
events up to ±15kV. The high output differential driver
delivers 10% higher SNR than other RS-485 / 422 devices,
affording additional noise margin or extended cable
lengths.
Enhanced Fail-Safe
Ordinary RS-485 differential receivers will be in an
indeterminate state whenever the data bus is not being
actively driven. The enhanced failsafe feature of the
XR3072X and XR3078X guarantees a logic-high receiver
output when the receiver inputs are open, shorted, or when
they are connected to a terminated transmission line with
all drivers disabled. In a terminated bus with all transmitters
disabled, the receivers’ differential input voltage is pulled to
0V by the termination. The XR3072X and XR3078X
interpret 0V differential as a logic high with a minimum
50mV noise margin while maintaining compliance with the
EIA / TIA-485 standard of ±200mV. Although the XR3072X
and XR3078X do not need failsafe biasing resistors, they
can operate without issue if biasing is used.
Receiver Input Filtering
The XR3072X receiver incorporates internal filtering in
addition to input hysteresis. This filtering enhances noise
immunity by ignoring signals that do not meet a minimum
pulse width of 30ns. Receiver propagation delay increases
slightly due to this filtering. The high speed XR3078X does
not have this input filtering.
If circuit boards are inserted into an energized backplane
(commonly called "live insertion" or "hot-swap"), power
may suddenly be applied to all circuits. Without the hotswap capability, this situation could improperly enable the
transceiver’s driver or receiver, driving invalid data onto
shared buses and possibly causing driver contention or
device damage.
Driver Output Protection
Two mechanisms prevent excessive output current and
power dissipation caused by faults or by bus contention.
First, a driver current limit on the output stage provides
immediate protection against short circuits over the whole
common-mode voltage range. Second, a thermal shutdown
circuit forces the driver outputs into a high-impedance state
if junction temperature becomes excessive.
Line Length
The RS-485 / RS-422 standard covers line lengths up to
4000ft. Maximum achievable line length is a function of
signal attenuation and noise. Termination prevents signal
reflections by eliminating the impedance mismatches on a
transmission line. Line termination is generally used if rise
and fall times are shorter than the round-trip signal
propagation time. Higher output drivers may allow longer
cables to be used.
Hot-Swap Capability
When VCC is first applied, the XR3072X and XR3078X hold
the driver enable and receiver enable inactive for
approximately 10 microseconds. During power ramp-up,
other system ICs may drive unpredictable values, or
tri-stated lines may be influenced by stray capacitance. The
hot-swap feature prevents these devices from driving any
output signal until power has stabilized. After the initial
10µs, the driver and receiver enable pins are weakly pulled
to their disabled states (low for DE, high for RE) until the
first transition. After the first transition, the DE and RE pins
operate as high impedance inputs.
8/30/19
11
XR3072X / XR3078X 3.3V RS-485 / RS-422 Transceivers Data Sheet
Product Description
±15kV ESD Protection
256 Transceivers on the Bus
ESD-protection structures are incorporated on all pins to
protect against electrostatic discharges encountered during
handling and assembly. The driver output and receiver
inputs of the XR3072X and XR3078X have extra protection
against static electricity. MaxLinear's uses state of the art
structures to protect these pins against ESD of ±15kV
without damage. The ESD structures withstand high ESD
in all states: normal operation, shutdown and powered
down. After an ESD event, the XR3072X and XR3078X
keep operating without latch-up or damage.
The standard RS-485 receiver input impedance is 12kΩ
(1 unit load). A standard driver can drive up to 32 unit
loads. The XR3072X and XR3078X have a 1/8th unit load
receiver input impedance (96kΩ), allowing up to 256
transceivers to be connected in parallel on a
communication line. Any combination of these devices and
other RS-485 transceivers up to a total of 32 unit loads may
be connected to the line.
ESD protection can be tested in various ways. The
transmitter outputs and receiver inputs of the XR3072X and
XR3078X are characterized for protection to the following
limits:
■
■
■
±15kV using the Human Body Model
±8kV using the Contact Discharge Model
±15kV Air-gap Discharge Model
ESD Test Conditions
ESD performance depends on a variety of conditions.
Contact MaxLinear for a reliability report that documents
test setup, methodology and results.
Low Power Shutdown Mode
Low-power shutdown mode is initiated by bringing both RE
high and DE low simultaneously. While in shutdown,
devices draw less than 1µA of supply current. DE and RE
may be tied together and driven by a single control signal.
Devices are guaranteed not to enter shutdown if RE is high
and DE is low for less than 50ns. If the inputs are in this
state for at least 600ns, the parts will enter shutdown.
Enable times tZH and tZL apply when the part is not in a
low-power shutdown state. Enable times tZH(SHDN) and
tZL(SHDN) apply when the parts are shutdown. The drivers
and receivers take longer to become enabled from lowpower shutdown mode tZH(SHDN) and tZL(SHDN) than from
driver /receiver-disable mode (tZH, tZL).
IEC 61000-4-2
The IEC 61000-4-2 standard covers ESD testing and
performance of finished equipment. However, it does not
specifically refer to integrated circuits. The XR3072X and
XR3078X help you design equipment to meet IEC 610004-2, without sacrificing board space and cost for external
ESD-protection components.
The major difference between tests done using the Human
Body Model and IEC 61000-4-2 is higher peak current in
IEC 61000-4-2. Series resistance is lower in the
IEC 61000-4-2 model. Hence, the ESD withstand voltage
measured to IEC 61000-4-2 is generally lower than that of
the Human Body Model.
The air-gap test involves approaching the device with a
charged probe. The contact discharge method connects
the probe to the device before the probe is energized.
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XR3072X / XR3078X 3.3V RS-485 / RS-422 Transceivers Data Sheet
Function Tables
Function Tables
Table 6: Half Duplex Receiving
Table 5: Half Duplex Transmitting
Receiving
Transmitting
Inputs
Inputs
Outputs
Output
RE
DE
DI
Y
Z
RE
DE
VA - VB
RO
X
1
1
1
0
0
X
≥ -50mV
1
X
1
0
0
1
0
X
≤ -200mV
0
0
0
X
High-Z
0
X
1
1
0
X
Shutdown
Open /
shorted
1
1
X
High-Z
1
0
X
Shutdown
1. Receiver inputs -200mV ≤ VA - VB ≤ -50mV are considered
indeterminate.
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XR3072X / XR3078X 3.3V RS-485 / RS-422 Transceivers Data Sheet
Mechanical Dimensions
Mechanical Dimensions
NSOIC8
Side View
Front View
Drawing No:
Revision:
POD-00000108
A
Figure 11: Mechanical Dimension, NSOIC8
8/30/19
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XR3072X / XR3078X 3.3V RS-485 / RS-422 Transceivers Data Sheet
Ordering Information
Ordering Information
Table 7: Ordering Information
Operating Temperature Range
Package
Packaging Method
Lead-Free(2)
Duplex / Data Rate
XR3072XID-F
-40°C to 85°C
NSOIC8
Tube
Yes
Half / 250kbps
XR3072XIDTR-F
-40°C to 85°C
NSOIC8
Reel
Yes
Half / 250kbps
XR3078XID-F
-40°C to 85°C
NSOIC8
Tube
Yes
Half / 20Mbps
XR3078XIDTR-F
-40°C to 85°C
NSOIC8
Reel
Yes
Half / 20Mbps
Ordering Part Number
XR3072X
XR3078X
1. Refer to www.maxlinear.com/XR3072X and www.maxlinear.com/XR3078X for most up-to-date Ordering Information.
2. Visit www.maxlinear.com for additional information on Environmental Rating.
8/30/19
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XR3072X / XR3078X 3.3V RS-485 / RS-422 Transceivers Data Sheet
Disclaimer
MaxLinear, Inc.
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760.692.0711 p.
760.444.8598 f.
www.maxlinear.com
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