EVALUATION KIT AVAILABLE
MAX22500E/MAX22501E
100Mbps Half-Duplex RS-485/RS-422
Transceivers for Long Cables
Benefits and Features
General Description
The MAX22500E/MAX22501E half-duplex ESD-protected
RS-485/RS-422 transceivers are optimized for high-
speed (up to 100Mbps) communication over long cables.
These transceivers feature integrated hot-swap protection
and a fail-safe receiver, ensuring a logic-high on the
receiver output when input signals are shorted or open for
longer than 10μs (typ).
The MAX22500E features integrated preemphasis circuitry
that extends the distance and increases the data rate of
reliable communication by reducing inter-symbol interference
(ISI) caused by long cables. The MAX22500E features a
flexible logic interface down to 1.6V.
The MAX22501E operates without preemphasis and is
powered from a 3V to 5.5V supply.
The MAX22500E is available in a 10-pin TDFN-EP package.
The MAX22501E is available in a 8-pin TDFN-EP package.
Both transceivers operate over the -40°C to +125°C ambient
temperature range.
●
High-Speed Operation Over Long Distances
• Up to 100Mbps Data Rate
• Integrated Preemphasis Extends Cable Length
(MAX22500E)
•
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 IEC 61000-4-2 Air-Gap ESD Protection
• ±6kV IEC 61000-4-2 Contact Discharge ESD
Protection
• Driver Outputs are Short-Circuit Protected
● Flexibility for Many Different Applications
•
3V to 5.5V Supply Range
•
Low Voltage Logic Supply Down to 1.6V
(MAX22500E)
•
Low 5μA (max) Shutdown Current
• Available in 8-pin or 10-pin TDFN Package
• -40°C to +125°C Operating Temperature Range
Applications
●
Motion Control
●
Encoder Interfaces
●
Field Bus Networks
● Industrial Control Systems
●
Backplane Busses
Ordering Information
appears at end of data sheet.
Simplified Block Diagram
VL
RO
RE
DE
DI
PSET
R
B
SHUTDOWN
VCC
RO
RE
DE
DI
R
VCC
B
SHUTDOWN
A
A
D
MAX22500E
GND
D
MAX22501E
GND
19-100073; Rev 0; 6/17
MAX22500E/MAX22501E
100Mbps Half-Duplex RS-485/RS-422
Transceivers for Long Cables
Absolute Maximum Ratings
V
CC
........................................................................-0.3 V to +6 V
RE,
DE, DI, VL ....................................................-0.3 V to +6 V
RO (MAX22500E only)
.............................. -0.3 V to (V
L
+ 0.3) V
RO (MAX22501E only)
............................. -0.3V to (V
CC
+ 0.3)V
PSET ........................................................ -0.3 V to (V
CC
+0.3) V
A, B.........................................................................-15V to +15V
Short-Circuit Duration (RO, A, B) to GND .................Continuous
Continuous Power Dissipation (T
A
= +70°C) (8-Pin TDFN
(derate 24.4mW/°C above +70°C) ) ..........................1951mW
Continuous Power Dissipation (T
A
= +70°C) (10-Pin TDFN
(derate 24.4mW/°C above +70°C) ) ..........................1951mW
Operating Temperature Range ........................ -40°C to +125°C
Junction Temperature .....................................................+150°C
Storage Temperature Range ........................... -65°C to +150°C
Lead Temperature (Soldering 10sec) ............................. +300°C
Reflow Temperature ....................................................... +270ºC
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
TDFN8
PACKAGE CODE
Outline Number
Land Pattern Number
Thermal Resistance, Single-Layer Board:
Junction to Ambient (θ
JA
)
Junction to Case (θ
JC
)
Thermal Resistance, Four-Layer Board:
Junction to Ambient (θ
JA
)
Junction to Case (θ
JC
)
41°C/W
8°C/W
54°C/W
8°C/W
21-0137
90-0059
T833-2
TDFN10
PACKAGE CODE
Outline Number
Land Pattern Number
Thermal Resistance, Single-Layer Board:
Junction to Ambient (θ
JA
)
Junction to Case (θ
JC
)
Thermal Resistance, Four-Layer Board:
Junction to Ambient (θ
JA
)
Junction to Case (θ
JC
)
41°C/W
9°C/W
54°C/W
9°C/W
21-0137
90-0061
T1033-2
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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Maxim Integrated
│
2
MAX22500E/MAX22501E
100Mbps Half-Duplex RS-485/RS-422
Transceivers for Long Cables
Electrical Characteristics
(V
CC
= 3V to 5.5V, V
L
= 1.6V to V
CC
(MAX22500E only), V
L
≤ V
CC
, T
A
= T
MIN
to T
MAX
, unless otherwise noted (Notes 1, 2))
PARAMETER
POWER
MAX22500E
MAX22501E
Supply Current
Shutdown Supply Current
Logic Supply Voltage
Logic Supply Current
DRIVER
Differential Driver Output
Differential Driver
Preemphasis Ratio
Change in Magnitude of
Differential Output Voltage
Driver Common-Mode
Output Voltage
Change In Magnitude of
Common-Mode Voltage
Single-Ended Driver Output
High
Single-Ended Driver Output
Low
Differential Output
Capacitance
Driver Short-Circuit Output
Current
RECEIVER
Input Current (A and B)
Differential Input
Capacitance
Common Mode Voltage
Range
Receiver Differential
Threshold High
I
A,B
C
A,B
V
CM
V
TH_H
-15V ≤ V
CM
≤ +15V
DE = GND, V
CC
=
GND, +3.6V or 5.5V
V
IN
= +12V
V
IN
= -7V
-1100
50
-15
+50
+15
+200
+1350
μA
pF
V
mV
V
OD
Figure 1, Figure 2
MAX22500E only,
preemphasis enabled,
4.5V ≤ V
CC
≤ 5.5V
(Note 3)
R
L
= 54Ω
R
L
= 100Ω
R
L
= 54Ω
R
L
= 100Ω
1.5
2.0
1.33
1.33
1.37
1.37
1.41
1.41
0.2
V
CC
/2
3
0.2
2.2
0.8
50
250
V/V
V
I
CC
I
SHDN
V
L
I
L
DE = high,
RE=
low, no load
DE = low,
RE=
high
MAX22500E only
MAX22500E only, no load on RO
1.6
16.4
MAX22500E
MAX22501E
Preemphasis
disabled
Preemphasis
enabled
3.0
4.5
3.0
12.7
4
5
5.5
5.5
5.5
16.5
5.6
5
V
CC
23
mA
µA
V
µA
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage
V
CC
D
PRE
ΔV
OD
V
OC
ΔV
OC
V
OH
V
OL
C
OD
|I
OST
|
R
L
= 54Ω,
Figure 1
(Note 4)
R
L
= 54Ω, Normal mode and
preemphasis,
Figure 1
R
L
= 100Ω or 54Ω,
Figure 1
(Note 4)
A or B output, I
OUT
= -20mA
A or B output, I
OUT
= +20mA
DE =
RE=
high, f = 4MHz
-15V ≤ V
OUT
≤ +15V
V
V
V
V
V
pF
mA
Between A and B, DE = GND, f = 2MHz
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3
MAX22500E/MAX22501E
100Mbps Half-Duplex RS-485/RS-422
Transceivers for Long Cables
Electrical Characteristics (continued)
(V
CC
= 3V to 5.5V, V
L
= 1.6V to V
CC
(MAX22500E only), V
L
≤ V
CC
, T
A
= T
MIN
to T
MAX
, unless otherwise noted (Notes 1, 2))
PARAMETER
Receiver Differential
Threshold Low
Receiver Input Hysteresis
Differential Input
Fail-Safe Level
SYMBOL
V
TH_L
ΔV
TH
V
TH_FS
CONDITIONS
-15V ≤ V
CM
≤ +15V
V
CM
= 0V, time from last transition is
less than t
D_FS
-15V ≤ V
CM
≤ +15V
-50
MIN
-200
250
+50
TYP
MAX
-50
UNITS
mV
mV
mV
LOGIC INTERFACE (RE, RO, DE, DI)
MAX22500E
Input Voltage High
V
IH
DE, DI,
RE
MAX22501E
MAX22500E
Input Voltage Low
Input Current
Input Impedance on First
Transition
RO Output High Voltage
RO Output Low Voltage
Three-State Output Current
at Receiver
PROTECTION
Thermal Shutdown
Threshold
Thermal Shutdown
Hysteresis
T
SH
T
SH_HYS
Human Body Model
ESD Protection
(A and B Pins)
IEC61000-4-2 Air Gap Discharge to
GND
IEC61000-4-2 Contact Discharge to
GND
Human Body Model
Temperature rising
+160
10
±15
±7
±6
±2
kV
kV
°C
°C
V
IL
I
IN
R
IN_FT
V
OH
V
OL
I
OZR
DE, DI,
RE
MAX22501E
-2
2/3xV
L
2/3 x
V
CC
1/3 x V
L
1/3 x
V
CC
+2
10
MAX22500E
MAX22501E
V
L
– 0.4
V
CC
- 0.4
0.4
-1
+1
V
V
μA
kΩ
V
V
μA
DI and DE,
RE
(after first transition)
DE,
RE
RE
= GND, (V
A
- V
B
) >
200mV, I
OUT
= -1mA
RE
= GND, (V
A
– V
B
) < -200mV,
I
OUT
= +1mA
RE=
high, 0 ≤ V
RO
≤ V
CC
ESD Protection
(All Other Pins)
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4
MAX22500E/MAX22501E
100Mbps Half-Duplex RS-485/RS-422
Transceivers for Long Cables
Electrical Characteristics - Switching
(V
CC
= 3V to 5.5V, V
L
= 1.6V to V
CC
(MAX22500E only), V
L
≤ V
CC
, T
A
= T
MIN
to T
MAX
, unless otherwise noted (Notes 1, 2))
PARAMETER
DRIVER (Note 5)
Driver Propagation Delay
t
DPLH
t
DPHL
R
L
= 54Ω, C
L
= 50pF,
Figures 3, 4
R
L
= 54Ω, C
L
= 50pF,
Figures 3, 4
MAX22501E
Differential Driver Output Skew
t
DSKEW
|t
DPLH
– t
DPHL
|,
R
L
= 54Ω,
C
L
= 50pF,
Figures 3, 4
(Note 6)
MAX22500E,
V
L
= V
CC
,
V
CC
≥ 3V
MAX22500E,
V
L
≠ V
CC
20
20
1.2
1.2
1.6
3
100
R
L
= 500Ω, C
L
= 50pF,
Figures 5, 6
R
L
= 500Ω, C
L
= 50pF,
Figures 5, 6
R
L
= 500Ω, C
L
= 50pF,
Figures 5, 6
R
L
= 500Ω, C
L
= 50pF,
Figures 5, 6
R
L
= 1kΩ, C
L
= 15pF,
Figures 5, 6
R
L
= 1kΩ, C
L
= 15pF,
Figures 5, 6
(Notes 7, 8)
MAX22500E only,
R
PSET
= 4kΩ
4.5V ≤ V
CC
≤ 5.5V,
R
L
= 100Ω,
Figure 2
R
PSET
= 400kΩ
50
10
0.8
13
1
10
20
2.5
100
R
L
= 1kΩ, C
L
= 15pF,
Figure 9
R
L
= 1kΩ, C
L
= 15pF,
Figure 9
R
L
= 1kΩ, C
L
= 15pF,
Figure 9
R
L
= 1kΩ, C
L
= 15pF,
Figure 9
30
30
30
30
30
30
30
30
100
100
800
16
1.2
ns
Mbps
ns
ns
ns
ns
µs
µs
ns
ns
μs
µs
ns
ns
Mbps
ns
ns
ns
ns
ns
ns
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Driver Differential Output
Rise and Fall Time
Data Rate
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from Low
Driver Disable Time from High
Driver Enable from Shutdown
to Output High
Driver Enable from Shutdown
to Output Low
Time to Shutdown
Driver Preemphasis Interval
RECEIVER (Note 5)
Delay to Fail-Safe Operation
Receiver Propagation Delay
Receiver Output Skew
Data Rate
Receiver Enable to Output
High
Receiver Enable to Output
Low
Receiver Disable Time from
Low
Receiver Disable Time from
High
t
HL
, t
LH
DR
t
DZH
t
DZL
t
DLZ
t
DHZ
t
DZH(SHDN)
t
DZL(SHDN)
t
SHDN
t
PRE
R
L
= 54Ω, C
L
= 50pF,
Figure 4
(Note 6)
t
D_FS
t
RPLH
,t
RPHL
C
L
= 15pF,
Figure 7, Figure 8
|t
RPHL
- t
RPLH
|, C
L
= 15pF,
t
RSKEW
Figures 7, 8
(Note 6)
DR
t
RZH
t
RZL
t
RLZ
t
RHZ
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