MAX22503EASD+ [MAXIM]
100Mbps Full-Duplex 3V/5V RS-485/RS-422 Transceiver with High EFT Immunity;
| 型号： | MAX22503EASD+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 100Mbps Full-Duplex 3V/5V RS-485/RS-422 Transceiver with High EFT Immunity 接口集成电路 |
| 文件： | 总15页 (文件大小：679K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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MAX22503E
100Mbps Full-Duplex 3V/5V RS-485/RS-422
Transceiver with High EFT Immunity
General Description
Benefits and Features
● High-Speed Operation
The MAX22503E full-duplex, ESD-protected, RS-485/
RS-422 transceiver for high-speed communication oper-
ates up to 100Mbps. This transceiver features larger
receiver hysteresis for high noise rejection and improved
signal integrity. Integrated hot-swap protection and a fail-
safe receiver ensure a logic-high on the receiver output
when input signals are shorted or open for longer than
10μs (typ).
• Up to 100Mbps Data Rate
• High Receiver Sensitivity
• Wide Receiver Bandwidth
• Symmetrical Receiver Thresholds
● Integrated Protection Increases Robustness
• -15V to +15V Common Mode Range
• ±15kV ESD Protection (Human Body Model)
• ±7kV IEC61000-4-2 Air-Gap ESD Protection
• ±6kV IEC61000-4-2 Contact Discharge
ESD Protection
The MAX22503E is available in 14-pin SOIC package and
operates over the -40°C to +125°C ambient temperature
range.
• Short-Circuit Protected Driver Outputs
Applications
● Motion Control
● Flexibility for Many Different Applications
• 3V to 5.5V Supply Range
• Low 5µA (max) Shutdown Current
• Available in 14-Pin SOIC Package
• -40°C to +125°C Operating Temperature Range
● Encoder Interfaces
● Field Bus Networks
● Industrial Control Systems
● Backplane Busses
Ordering Information appears at end of data sheet.
Simplified Block Diagram
V
CC
B
A
RO
R
RE
SHUTDOWN
D
DE
DI
Y
Z
MAX22503E
GND
19-100552; Rev 0; 5/19
MAX22503E
100Mbps Full-Duplex 3V/5V RS-485/RS-422
Transceiver with High EFT Immunity
Absolute Maximum Ratings
CC
RE, DE, DI.............................................................-0.3 V to +6 V
RO ..........................................................-0.3 V to (V + 0.3) V
A, B, Y, Z ................................................................-15V to +15V
Short-Circuit Duration (RO, Y, Z) to GND .................Continuous
Continuous Power Dissipation (14-Pin SOIC, Single Layer
V
........................................................................-0.3 V to +6 V
Continuous Power Dissipation (14-Pin SOIC, Multilayer Board,
= +70°C, derate 11.9mW/°C above +70°C)........952.4mW
Operating Temperature Range......................... -40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range............................ -65°C to +150°C
Reflow Temperature ........................................................+300°C
T
A
CC
Board, T = +70°C, derate 8.3mW/°C
A
above +70°C) .......................................................... 666.7mW
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
PACKAGE TYPE: 14 SOIC
Package Code
S14-1
Outline Number
21-0041
90-0112
Land Pattern Number
SINGLE-LAYER BOARD
Junction to Ambient (θ
)
120°C/W
37°C/W
JA
Junction to Case (θ
)
JC
FOUR-LAYER BOARD
Junction to Ambient (θ
)
84°C/W
34°C/W
JA
Junction to Case (θ
)
JC
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.
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MAX22503E
100Mbps Full-Duplex 3V/5V RS-485/RS-422
Transceiver with High EFT Immunity
Electrical Characteristics
(V
= 3V to 5.5V, T = T
A
to T
, unless otherwise noted) (Notes 1, 2)
MAX
CC
MIN
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
POWER
Supply Voltage
Supply Current
V
I
3.0
5.5
16.5
5
V
CC
12.7
mA
µA
DE = high, RE = low, no load
DE = low, RE = high
CC
Shutdown Supply Current
I
SHDN
DRIVER
R = 54Ω
1.5
2.0
L
Differential Driver Output
V
Figure 1
V
OD
R = 100Ω
L
Change in Magnitude of Differential
Output Voltage
ΔV
R = 54Ω, Figure 1 (Note 3)
0.2
3
V
V
V
OD
L
Driver Common-Mode Output
Voltage
V
R = 54Ω, Figure 1
V
/2
OC
L
CC
Change In Magnitude of
Common-Mode Voltage
ΔV
R = 100Ω or 54Ω, Figure 1 (Note 3)
0.2
OC
L
Single-Ended Driver Output High
Single-Ended Driver Output Low
Differential Output Capacitance
V
Y or Z output
Y or Z output
I
I
= -20mA
= +20mA
2.2
V
V
OH
OUT
V
C
0.8
OL
OUT
50
pF
DE = RE = high, f = 4MHz
OD
Driver Short-Circuit Output
Current
|I
|
-15V ≤ V
≤ +15V
250
mA
OST
OUT
RECEIVER
V
V
= +12V
= -7V
+1100
DE = GND, V
GND, +3.6V or 5.5V
=
IN
CC
Input Current (A and B)
I
μA
A,B
-1000
IN
Between A and B, DE = GND,
f = 2MHz
Differential Input Capacitance
C
50
pF
V
A,B
Common Mode Voltage Range
V
-15
+15
CM
Receiver Differential Threshold
High
V
-15V ≤ V
-15V ≤ V
≤ +15V
≤ +15V
+50
+200
mV
TH_H
CM
Receiver Differential Threshold
Low
V
-200
-50
mV
TH_L
CM
V
< t
= 0V, time from last transition is
CM
Receiver Input Hysteresis
ΔV
250
mV
mV
TH
D_FS
Differential Input Fail-Safe Level
V
-15V ≤ V
≤ +15V
-50
+50
TH_FS
CM
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MAX22503E
100Mbps Full-Duplex 3V/5V RS-485/RS-422
Transceiver with High EFT Immunity
Electrical Characteristics (continued)
(V
= 3V to 5.5V, T = T
to T
, unless otherwise noted) (Notes 1, 2)
CC
A
MIN
MAX
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
LOGIC INTERFACE (RE, RO, DE, DI)
2/3 x
Input Voltage High
V
V
V
DE, DI, RE
DE, DI, RE
IH
V
CC
1/3 x
Input Voltage Low
Input Current
V
I
IL
V
CC
-2
+2
10
μA
kΩ
DI and DE, RE (after first transition)
DE, RE
IN
Input Impedance on First Transition
RO Output Voltage High
R
IN_FT
V
-
RE = GND, (V - V ) > 200mV,
CC
A
B
V
V
V
OH
0.4
I
= -1mA
OUT
RE = GND, (V - V ) < -200mV,
A
B
RO Output Low Voltage
V
0.4
+1
OL
I
= +1mA
OUT
Three-State Output Current at
Receiver
I
-1
μA
RE = high, 0 ≤ V
≤ V
CC
OZR
RO
PROTECTION
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
T
Die temperature rising
Human Body Model
+160
10
°C
°C
SH
T
SH_HYS
±15
±7
ESD Protection (A and B Pins)
ESD Protection (All Other Pins)
IEC61000-4-2 Air Gap Discharge to GND
IEC61000-4-2 Contact Discharge to GND
Human Body Model
kV
kV
±6
±2
Electrical Characteristics - Switching
(V
= 3V to 5.5V, T = T
to T
, unless otherwise noted) (Notes 1, 2)
CC
A
MIN
MAX
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DRIVER (Note 4)
t
t
R = 54Ω, C = 50pF, Figure 2, Figure 3
20
20
DPLH
DPHL
L
L
Driver Propagation Delay
ns
R = 54Ω, C = 50pF, Figure 2, Figure 3
L
L
|t
– t
|, R = 54Ω, C = 50pF,
DPLH
DPHL L L
Differential Driver Output Skew
t
1.2
3
ns
ns
DSKEW
Figure 2, Figure 3 (Note 5)
Driver Differential Output Rise
and Fall Time
t
, t
R = 54Ω, C = 50pF, Figure 3 (Note 5)
HL LH
L
L
Data Rate
DR
100
30
30
30
30
Mbps
ns
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from Low
Driver Disable Time from High
t
R = 500Ω, C = 50pF, Figure 4, Figure 5
L L
DZH
t
R = 500Ω, C = 50pF, Figure 4, Figure 5
ns
DZL
DLZ
DHZ
L
L
t
R = 500Ω, C = 50pF, Figure 4, Figure 5
ns
L
L
t
R = 500Ω, C = 50pF, Figure 4, Figure 5
ns
L
L
Driver Enable from Shutdown to
Output High
t
R = 1kΩ, C = 15pF, Figure 4, Figure 5
100
µs
DZH(SHDN)
L
L
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MAX22503E
100Mbps Full-Duplex 3V/5V RS-485/RS-422
Transceiver with High EFT Immunity
Electrical Characteristics - Switching (continued)
(V
= 3V to 5.5V, T = T
to T
, unless otherwise noted) (Notes 1, 2)
CC
A
MIN
MAX
PARAMETER
SYMBOL
CONDITIONS
R = 1kΩ, C = 15pF, Figure 4, Figure 5
MIN
TYP
MAX
100
UNITS
µs
Driver Enable from Shutdown to
Output Low
t
DZL(SHDN)
L
L
Time to Shutdown
t
(Note 6, Note 7)
50
800
ns
SHDN
RECEIVER (Note 4)
Delay to Fail-Safe Operation
t
10
µs
ns
D_FS
RPLH
RPHL
t
C = 15pF, Figure 6, Figure 7
20
20
L
Receiver Propagation Delay
Receiver Output Skew
t
C = 15pF, Figure 6, Figure 7
L
|t
- t
|, C = 15pF, Figure 6,
RPHL RPLH L
t
2.5
ns
RSKEW
Figure 7 (Note 5)
Data Rate
DR
100
30
30
30
30
Mbps
ns
Receiver Enable to Output High
Receiver Enable to Output Low
Receiver Disable Time from Low
Receiver Disable Time from High
t
R = 1kΩ, C = 15pF, Figure 8
L L
RZH
t
R = 1kΩ, C = 15pF, Figure 8
ns
RZL
RLZ
RHZ
L
L
t
R = 1kΩ, C = 15pF, Figure 8
ns
L
L
t
R = 1kΩ, C = 15pF, Figure 8
ns
L
L
Receiver Enable from Shutdown
to Output High
t
R = 1kΩ, C = 15pF, Figure 8
100
μs
RZH (SHDN)
L
L
Receiver Enable from Shutdown
to Output Low
t
R = 1kΩ, C = 15pF, Figure 8
100
800
μs
RZL (SHDN)
L
L
Time to Shutdown
t
(Note 6, Note 7)
50
ns
SHDN
Note 1: All devices are 100% production tested at T = +25°C. Specifications for all temperature limits are guaranteed by design.
A
Note 2: 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 3: ΔV
and ΔV
are the changes in V
and V , respectively, when the DI input changes state.
OD
OC
OD OC
Note 4: Capacitive load includes test probe and fixture capacitance.
Note 5: Not production tested. Guaranteed by design.
Note 6: Shutdown is enabled by driving RE high and DE low. The device is guaranteed to have entered shutdown after t
elapsed.
has
SHDN
Note 7: The timing parameter refers to the driver or receiver enable delay, when the device has exited the initial hot-swap protect
state and is in normal operating mode.
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MAX22503E
100Mbps Full-Duplex 3V/5V RS-485/RS-422
Transceiver with High EFT Immunity
Y
Z
RL
2
VOD
RL
2
VOC
Figure 1. Driver DC Test Load
VCC
DE
Y
Z
VOD
RL
CL
Figure 2. Driver Timing Test Circuit
f = 1MHz, tLH = 3ns, tHL = 3ns
VCC
0
DI
50%
tDPLH
50%
tDPHL
Z
Y
VOD
VOD = (VY - VZ)
VO
0
90%
10%
90%
10%
VOD
-VO
tHL
tLH
tDSKEW = |tDPLH - tDPHL
|
Figure 3. Driver Propagation Delays
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MAX22503E
100Mbps Full-Duplex 3V/5V RS-485/RS-422
Transceiver with High EFT Immunity
Y
Z
DI
OUT
V
GND OR V
CC
CC
50%
C
R
L
L
0V
DE
t
, t
DZH DZH(SHDN)
0.25V
V
OH
GENERATOR
50%
50Ω
OUT
0V
tDHZ
Figure 4. Driver Enable and Disable Times (t
, t
)
DZH DHZ
V
CC
R
L
Y
DI
OUT
V
GND OR V
CC
CC
Z
50%
C
DE
L
0V
t
, t
DZL DZL(SHDN)
t
DLZ
V
CC
50%
0.25V
GENERATOR
50Ω
OUT
V
OL
Figure 5. Driver Enable and Disable Times (t
, t
)
DZL DLZ
A
B
RO
R
ATE
VID
Figure 6. Receiver Propagation Delay Test Circuit
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MAX22503E
100Mbps Full-Duplex 3V/5V RS-485/RS-422
Transceiver with High EFT Immunity
A
B
+1V
-1V
tRPLH
tRPHL
VOH
RO
50%
50%
VOL
tRSKEW = |tRPHL – tRPHL|
Figure 7. Receiver Propagation Delays
R
1kΩ
L
S1
S2
S3
+1.5V
-1.5V
V
CC
RO
R
V
IO
C
L
15pF
GENERATOR
50Ω
V
V
CC
CC
RE
RE
50%
50%
0V
0V
t
, t
t
, t
S1 OPEN
S2 CLOSED
S3 = +1.5V
S1 CLOSED
S2 OPEN
S3 = -1.5V
RZH RZH(SHDN)
RZL RZL(SHDN)
V
V
V
OH
OH
50%
RO
RO
50%
0V
OL
V
V
CC
CC
RE
RE
50%
50%
S1 CLOSED
S2 OPEN
S3 = -1.5V
0V
0V
S1 OPEN
S2 CLOSED
S3 = +1.5V
t
RHZ
t
RLZ
V
OH
V
V
OH
0.25V
RO
RO
0.25V
0V
OL
Figure 8. Receiver Enable and Disable Times
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MAX22503E
100Mbps Full-Duplex 3V/5V RS-485/RS-422
Transceiver with High EFT Immunity
Typical Operating Characteristics
V
= 5V, 60Ω termination between Y and Z, T = 25°C, unless otherwise noted.
CC
A
RO OUTPUT VOLTAGE LOW
vs. LOAD CURRENT
SUPPLY CURRENT vs. DATA RATE
toc01
toc02
150
125
100
75
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
SQUARE WAVE ON DI (50% DUTY CYCLE)
(VA - VB) < -200mV
VCC = 5V, 54Ω LOAD
VCC = 3.3V
VCC = 3.3V, 54Ω LOAD
50
VCC = 5V
VCC = 5V, NO LOAD
VCC = 3.3V, NO LOAD
25
0
0.01
0.1
1
10
100
0
10
20
30
40
50
DATA RATE (Mbps)
SINK CURRENT (mA)
RO OUTPUT VOLTAGE HIGH
vs. LOAD CURRENT
DIFFERENTIAL DRIVER OUTPUT VOLTAGE
vs. LOAD CURRENT
toc04
toc03
6
5
4
3
2
1
0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
(VA - VB) > +200mV
VCC = 5V
VCC = 5V
VCC = 3.3V
VCC = 3.3V
0
-10
-20
-30
-40
-50
0
25
50
75
100
SOURCE CURRENT (mA)
LOAD CURRENT (mA)
DRIVER OUTPUT VOLTAGE LOW
vs. LOAD CURRENT
DIFFERENTIAL DRIVER OUTPUT VOLTAGE
vs. TEMPERATURE
toc05
toc06
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
DI = GND
VCC = 5V
VCC = 3.3V
VCC = 3.3V
VCC = 5V
RL = 54Ω
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (ºC)
0
25
50
75
100
125
150
SINK CURRENT (mA)
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MAX22503E
100Mbps Full-Duplex 3V/5V RS-485/RS-422
Transceiver with High EFT Immunity
Typical Operating Characteristics (continued)
V
= 5V, 60Ω termination between Y and Z, T = 25°C, unless otherwise noted.
CC
A
DRIVER OUTPUT VOLTAGE HIGH
DRIVER OUTPUT LEAKAGE CURRENT
vs. OUTPUT VOLTAGE
vs. LOAD CURRENT
toc07
toc08
5.0
4.5
4.0
3.5
3.0
2.5
2.0
400
300
200
100
0
DI = VCC
DE = GND
VCC = 5V
VCC = 3.3V
-100
-200
-300
-400
VCC = 3.3V
VCC = 5V
0
-25
-50
-75
-100
-125
-150
-15
-10
-5
0
5
10
15
SOURCE CURRENT (mA)
SOURCE CURRENT (mA)
DRIVER PROPAGATION DELAY
vs. TEMPERATURE
DRIVER PROPAGATION DELAY SKEW
vs. TEMPERATURE
toc09
toc10
20
18
16
14
12
10
8
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
RL = 54Ω
CL = 50pF
RL = 54Ω
CL = 50pF
VCC = 3.3V, tDPHL
VCC = 3.3V, tDPLH
VCC = 3.3V
6
4
VCC = 5V, tDPHL
2
VCC = 5V, tDPLH
VCC = 5V
0
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (ºC)
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (ºC)
RECEIVER PROPAGATION DELAY
vs. TEMPERATURE
EYE DIAGRAM
toc12
toc11
20
18
16
14
12
10
8
VCC = 3.3V, tRPHL
VCC = 3.3V, tRPLH
VCC = 5V, tRPHL
VY - VZ
1V/div
VCC = 5V, tRPLH
6
4
2
CL = 15pF
0
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (ºC)
2.5ns/div
100Mbps, 10m cat5e CABLE
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MAX22503E
100Mbps Full-Duplex 3V/5V RS-485/RS-422
Transceiver with High EFT Immunity
Pin Configuration
TOP VIEW
+
1
2
3
4
5
6
7
14
N.C.
RO
V
V
A
B
Z
Y
CC
CC
13
12
11
10
9
MAX22503E
RE
DE
DI
GND
GND
8
N.C.
SOIC
Pin Description
MAX22503E
PIN
1, 8
2
NAME
N.C.
RO
FUNCTION
Not connected. Not internally connected.
Receiver Output. See the Receiving Function Table for more information.
Receiver Enable. Set RE high to disable the receiver and three-state RO. The device is in low-power
shutdown when RE = high and DE = low.
3
RE
4
5
DE
DI
GND
Y
Driver Output Enable. Set DE high to enable driver. Set DE low to set the driver output in three-state.
Driver Input. See the Transmitting Function Table for more information.
Ground
6, 7
9
Noninverting Driver Output
10
Z
Inverting Driver Output
11
B
Inverting Receiver Input
12
A
Noninverting Receiver Input
13, 14
V
Supply Input. Bypass V
to ground with a 0.1µF ceramic capacitor as close to the device as possible.
CC
CC
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MAX22503E
100Mbps Full-Duplex 3V/5V RS-485/RS-422
Transceiver with High EFT Immunity
Functional Diagrams
Transmitting Function Table
INPUTS
OUTPUTS
DE
1
DI
1
Y
Z
RE
X
1
0
X
1
0
0
1
0
0
X
X
High Impedance
High Impedance
1
0
Shutdown. Y and Z are high-impedance
X = Don't care
Receiving Function Table
INPUTS
OUTPUTS
DE
(V - V )
Time from Last A-B Transition
RO
RE
A
B
0
X
X
≥ V
Always
1
TH_H
Indeterminate
RO is latched to previous value
0
V
< (V - V ) < V
< t
TH_L
A
B
TH_H
D_FS
0
X
X
X
1
-50mV < (V - V ) < +50mV
> t
1
A
B
D_FS
0
≤ V
Always
0
TH_L
0
Open/Shorted
> t
D_FS
X
1
1
X
X
High Impedance
1
0
X
Shutdown. RO is high-impedance
X = Don’t care
Typical Application Circuit
Full-Duplex Point-to-Point Application Circuit
3.3V
3.3V
V
D
V
CC
CC
DE
DI
RE
RO
B
A
Z
Y
R
120Ω
DE
DI
Y
Z
A
B
RO
120Ω
D
R
RE
MAX22503E
MAX22503E
GND
GND
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MAX22503E
100Mbps Full-Duplex 3V/5V RS-485/RS-422
Transceiver with High EFT Immunity
Hot-Swap Capability
Detailed Description
The DE and RE enable inputs feature hot-swap function-
The MAX22503E ESD-protected RS-485/RS-422 trans-
ceiver for high-speed, full-duplex communications oper-
ates up to 100Mbps. This transceiver features integrated
hot-swap functionality to eliminate false transitions on
the driver during power-up or during a hot-plug event.
Fail-safe receiver inputs guarantee a logic-high on the
receiver output when inputs are shorted or open for longer
than 10µs (typ).
ality. At each input there are two NMOS devices, M1 and
M2 (Figure 9). When V
ramps from zero, an internal
CC
10ms timer turns on M2 and sets the SR latch, which also
turns on M1. Transistors M2, a 500μA current sink, and
M1, a 100μA current sink, pull DE to GND through a 5kΩ
resistor. M2 is designed to pull DE to the disabled state
against an external parasitic capacitance up to 100pF that
can drive DE high. After 10μs, the timer deactivates M2
while M1 remains on, holding DE low against three-state
leakages that can drive DE high. M1 remains on until an
external source overcomes the required input current.
At this time, the SR latch resets and M1 turns off. When
M1 turns off, DE reverts to a standard, high-impedance
Receiver Threshold Voltages
The MAX22503E receiver features a large threshold
hysteresis of 250mV (typ) for increased differential noise
rejection.
Additionally, the receiver features symmetrical threshold
voltages. Symmetric thresholds have the advantage that
recovered data at the RO output does not have duty cycle
distortion.Typically, fail-safereceivers, whichhaveunipolar
(non-symmetric)thresholds,showsomedutycycledistortion
at high signal attenuation due to long cable lengths.
CMOS input. Whenever V
swap input is reset.
drops below 1V, the hot-
CC
There is a complimentary circuit for RE that uses two
PMOS devices to pull RE to V
.
CC
Driver Output Protection
Fail-Safe Functionality
Two mechanisms prevent excessive output current and
power dissipation caused by faults or by bus contention. The
first, a current limit on the output stage provides immediate
protection against short circuits over the whole common-
mode voltage range. The second, a thermal-shutdown
circuit, forces the driver outputs into a high-impedance
state if the die temperature exceeds +160°C (typ).
The MAX22503E features fail-safe receiver inputs,
guaranteeing a logic-high on the receiver output (RO)
when the receiver inputs are shorted or open for longer
than 10μs (typ). When the differential receiver input
voltage is less than 50mV for more than 10μs (typ), RO is
logic-high. For example, in the case of a terminated bus
with all transmitters disabled, the receiver’s differential
input voltage is pulled to 0V by the termination resistor,
Low-Power Shutdown Mode
The MAX22503E features low-power shutdown mode to
reduce supply current when the transceiver is not needed.
Pull the RE input high and the DE input low to put the
device in low-power shutdown mode. If the inputs are
in this state for at least 800ns, the part is guaranteed to
enter shutdown. The MAX22503E draws 5μA (max) of
supply current when the device is in shutdown.
so (V - V = 0V) > -50mV and RO is guaranteed to be a
logic-high after 10μs (typ).
A
B
Driver Single-Ended Operation
The Y and Z outputs on the MAX22503E can be used
in the standard differential operating mode or as single-
ended outputs. Because the driver outputs swing rail-to-
rail, they can also be used as individual standard TTL
logic outputs.
The RE and DE inputs can be driven simultaneously. The
MAX22503E is guaranteed not to enter shutdown if RE is
high and DE is low for less than 50ns.
Maxim Integrated
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MAX22503E
100Mbps Full-Duplex 3V/5V RS-485/RS-422
Transceiver with High EFT Immunity
V
CC
10µs
TIMER
TIMER
5kΩ
DE
DE
(HOT-SWAP)
100µA
500µA
Figure 9. Simplified Structure of the Driver Enable (DE) Pin
Applications Information
Ordering Information
PACKAGE
Network Topology
PART
PIN-PACKAGE
CODE
S14-1
S14-1
The MAX22503E transceiver is designed for high-speed
bidirectional RS-485/RS-422 data communications.
Multidrop networks can cause impedance discontinuities
which affect signal integrity. Maxim recommends using
a point-to-point network topology, instead of a multidrop
topology, when communicating with high data rates.
Terminate the transmission line at both ends with the
cable’s characteristic impedance to reduce reflections.
MAX22503EASD+
14 SOIC
14 SOIC
MAX22503EASD+T
+Denotes a lead (Pb)-free/RoHS-compliant package.
T = Tape and reel.
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MAX22503E
100Mbps Full-Duplex 3V/5V RS-485/RS-422
Transceiver with High EFT Immunity
Revision History
REVISION REVISION
PAGES
DESCRIPTION
CHANGED
NUMBER
DATE
0
5/19
Initial release
—
For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.
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.
2019 Maxim Integrated Products, Inc.
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