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MAX1487C/D

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
General Description
The MAX481, MAX483, MAX485, MAX487–MAX491, and
MAX1487 are low-power transceivers for RS-485 and RS-
422 communication. Each part contains one driver and one
receiver. The MAX483, MAX487, MAX488, and MAX489
feature reduced slew-rate drivers that minimize EMI and
reduce reflections caused by improperly terminated cables,
thus allowing error-free data transmission up to 250kbps.
The driver slew rates of the MAX481, MAX485, MAX490,
MAX491, and MAX1487 are not limited, allowing them to
transmit up to 2.5Mbps.
These transceivers draw between 120µA and 500µA of
supply current when unloaded or fully loaded with disabled
drivers. Additionally, the MAX481, MAX483, and MAX487
have a low-current shutdown mode in which they consume
only 0.1µA. All parts operate from a single 5V supply.
Drivers are short-circuit current limited and are protected
against excessive power dissipation by thermal shutdown
circuitry that places the driver outputs into a high-imped-
ance state. The receiver input has a fail-safe feature that
guarantees a logic-high output if the input is open circuit.
The MAX487 and MAX1487 feature quarter-unit-load
receiver input impedance, allowing up to 128 MAX487/
MAX1487 transceivers on the bus. Full-duplex communi-
cations are obtained using the MAX488–MAX491, while
the MAX481, MAX483, MAX485, MAX487, and MAX1487
are designed for half-duplex applications.
________________________Applications
Low-Power RS-485 Transceivers
Low-Power RS-422 Transceivers
Level Translators
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
__Next Generation Device Features
o For Fault-Tolerant Applications
MAX3430: ±80V Fault-Protected, Fail-Safe, 1/4
Unit Load, +3.3V, RS-485 Transceiver
MAX3440E–MAX3444E: ±15kV ESD-Protected,
±60V Fault-Protected, 10Mbps, Fail-Safe,
RS-485/J1708 Transceivers
o For Space-Constrained Applications
MAX3460–MAX3464: +5V, Fail-Safe, 20Mbps,
Profibus RS-485/RS-422 Transceivers
MAX3362: +3.3V, High-Speed, RS-485/RS-422
Transceiver in a SOT23 Package
MAX3280E–MAX3284E: ±15kV ESD-Protected,
52Mbps, +3V to +5.5V, SOT23, RS-485/RS-422,
True Fail-Safe Receivers
MAX3293/MAX3294/MAX3295: 20Mbps, +3.3V,
SOT23, RS-485/RS-422 Transmitters
o For Multiple Transceiver Applications
MAX3030E–MAX3033E: ±15kV ESD-Protected,
+3.3V, Quad RS-422 Transmitters
o For Fail-Safe Applications
MAX3080–MAX3089: Fail-Safe, High-Speed
(10Mbps), Slew-Rate-Limited RS-485/RS-422
Transceivers
o For Low-Voltage Applications
MAX3483E/MAX3485E/MAX3486E/MAX3488E/
MAX3490E/MAX3491E: +3.3V Powered, ±15kV
ESD-Protected, 12Mbps, Slew-Rate-Limited,
True RS-485/RS-422 Transceivers
MAX481/MAX483/MAX485/
MAX487–MAX491/MAX1487
Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
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.
______________________________________________________________Selection Table
19-0122; Rev 10; 9/14
PART
NUMBER
HALF/FULL
DUPLEX
DATA
RATE
(Mbps)
SLEW-RATE
LIMITED
LOW-
POWER
SHUTDOWN
RECEIVER/
DRIVER
ENABLE
QUIESCENT
CURRENT
(μA)
NUMBER OF
RECEIVERS ON
BUS
PIN
COUNT
MAX481 Half 2.5 No Yes Yes 300 32 8
MAX483 Half 0.25 Yes Yes Yes 120 32 8
MAX485 Half 2.5 No No Yes 300 32 8
MAX487 Half 0.25 Yes Yes Yes 120 128 8
MAX488 Full 0.25 Yes No No 120 32 8
MAX489 Full 0.25 Yes No Yes 120 32 14
MAX490 Full 2.5 No No No 300 32 8
MAX491 Full 2.5 No No Yes 300 32 14
MAX1487 Half 2.5 No No Yes 230 128 8
Ordering Information appears at end of data sheet.
Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
2 Maxim Integrated
MAX481/MAX483/MAX485/
MAX487–MAX491/MAX1487
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
CC
).............................................................12V
Control Input Voltage (RE, DE)...................-0.5V to (V
CC
+ 0.5V)
Driver Input Voltage (DI).............................-0.5V to (V
CC
+ 0.5V)
Driver Output Voltage (A, B)...................................-8V to +12.5V
Receiver Input Voltage (A, B).................................-8V to +12.5V
Receiver Output Voltage (RO)....................-0.5V to (V
CC
+ 0.5V)
Continuous Power Dissipation (T
A
= +70°C)
8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) ....727mW
14-Pin Plastic DIP (derate 10.00mW/°C above +70°C) ..800mW
8-Pin SO (derate 5.88mW/°C above +70°C).................471mW
14-Pin SO (derate 8.33mW/°C above +70°C)...............667mW
8-Pin µMAX (derate 4.1mW/°C above +70°C) ..............830mW
8-Pin CERDIP (derate 8.00mW/°C above +70°C).........640mW
14-Pin CERDIP (derate 9.09mW/°C above +70°C).......727mW
Operating Temperature Ranges
MAX4_ _C_ _/MAX1487C_ A ...............................0°C to +70°C
MAX4_ _E_ _/MAX1487E_ A.............................-40°C to +85°C
MAX4_ _M_/MAX1487MJA .............................-55°C to +125°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 5V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Notes 1, 2)
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.
V
V
IN
= -7V
V
IN
= 12V
V
IN
= -7V
V
IN
= 12V
Input Current
(A, B)
I
IN2
V
TH
kΩ48-7V ≤ V
CM
≤ 12V, MAX487/MAX1487
R
IN
Receiver Input Resistance
-7V ≤ V
CM
≤ 12V, all devices except
MAX487/MAX1487
R = 27Ω (RS-485), Figure 4
0.4V ≤ V
O
≤ 2.4V
R = 50Ω (RS-422)
I
O
= 4mA, V
ID
= -200mV
I
O
= -4mA, V
ID
= 200mV
V
CM
= 0V
-7V ≤ V
CM
≤ 12V
DE, DI, RE
DE, DI, RE
MAX487/MAX1487,
DE = 0V, V
CC
= 0V or 5.25V
DE, DI, RE
R = 27Ω or 50Ω, Figure 4
R = 27Ω or 50Ω, Figure 4
R = 27Ω or 50Ω, Figure 4
DE = 0V;
V
CC
= 0V or 5.25V,
all devices except
MAX487/MAX1487
CONDITIONS
kΩ12
µA±1I
OZR
Three-State (high impedance)
Output Current at Receiver
V
0.4V
OL
Receiver Output Low Voltage
3.5V
OH
Receiver Output High Voltage
mV70ΔV
TH
Receiver Input Hysteresis
V-0.2 0.2
Receiver Differential Threshold
Voltage
-0.2
mA
0.25
mA
-0.8
1.0
1.5 5
V
OD2
Differential Driver Output
(with load)
V
2
V5V
OD1
Differential Driver Output (no load)
µA±2I
IN1
Input Current
V0.8V
IL
Input Low Voltage
V2.0V
IH
Input High Voltage
V0.2ΔV
OD
Change in Magnitude of Driver
Common-Mode Output Voltage
for Complementary Output States
V0.2ΔV
OD
Change in Magnitude of Driver
Differential Output Voltage for
Complementary Output States
V3V
OC
Driver Common-Mode Output
Voltage
UNITSMIN TYP MAXSYMBOLPARAMETER
Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
Maxim Integrated 3
MAX481/MAX483/MAX485/
MAX487–MAX491/MAX1487
SWITCHING CHARACTERISTICS—MAX481/MAX485, MAX490/MAX491, MAX1487
(V
CC
= 5V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Notes 1, 2)
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 5V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Notes 1, 2)
mA
7950V ≤ V
O
≤ V
CC
I
OSR
Receiver Short-Circuit Current
mA35 250-7V ≤ V
O
≤12V (Note 4)I
OSD2
Driver Short-Circuit Current,
V
O
= Low
mA35 250-7V ≤ V
O
≤12V (Note 4)I
OSD1
Driver Short-Circuit Current,
V
O
= High
MAX1487,
RE = 0V or V
CC
250 400
350 650
ns
10 30 60t
PHL
Driver Rise or Fall Time
Figures 6 and 8, R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF
ns
MAX490M, MAX491M
MAX490C/E, MAX491C/E 20 90 150
MAX481, MAX485, MAX1487
MAX490M, MAX491M
MAX490C/E, MAX491C/E
MAX481, MAX485, MAX1487
Figures 6 and 8, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
MAX481 (Note 5)
Figures 5 and 11, C
RL
= 15pF, S2 closed
Figures 5 and 11, C
RL
= 15pF, S1 closed
Figures 5 and 11, C
RL
= 15pF, S2 closed
Figures 5 and 11, C
RL
= 15pF, S1 closed
Figures 6 and 10, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
Figures 6 and 8,
R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
Figures 6 and 10,
R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
CONDITIONS
ns
510t
SKEW
ns50 200 600t
SHDN
Time to Shutdown
Mbps2.5f
MAX
Maximum Data Rate
ns20 50t
HZ
Receiver Disable Time from High
ns
10 30 60t
PLH
20 50t
LZ
Receiver Disable Time from Low
ns20 50t
ZH
Driver Input to Output
Receiver Enable to Output High
ns20 50t
ZL
Receiver Enable to Output Low
20 90 200
ns
ns
13
40 70t
HZ
t
SKD
Driver Disable Time from High
| t
PLH
- t
PHL
| Differential
Receiver Skew
ns40 70t
LZ
Driver Disable Time from Low
ns
40 70t
ZL
Driver Enable to Output Low
31540
ns
51525
ns
31540
t
R
, t
F
20 90 200
Driver Output Skew to Output
t
PLH
, t
PHL
Receiver Input to Output
40 70t
ZH
Driver Enable to Output High
UNITSMIN TYP MAXSYMBOLPARAMETER
CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER
230 400
300 500
MAX481/MAX485,
RE = 0V or V
CC
500 900
MAX490/MAX491,
DE, DI, RE = 0V or V
CC
300 500
MAX488/MAX489,
DE, DI, RE = 0V or V
CC
120 250
DE = V
CC
300 500DE = 0V
DE = V
CC
DE = 0V
µA
MAX481/483/487, DE = 0V, RE = V
CC
0.1 10I
SHDN
Supply Current in Shutdown
120 250
I
CC
No-Load Supply Current
(Note 3)
DE = 5V
DE = 0V
MAX483
MAX487
MAX483/MAX487,
RE = 0V or V
CC
Figures 7 and 9, C
L
= 100pF, S2 closed
Figures 7 and 9, C
L
= 100pF, S1 closed
Figures 7 and 9, C
L
= 15pF, S1 closed
Figures 7 and 9, C
L
= 15pF, S2 closed
µA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

MAX1487C/D

Mfr. #:
Buy MAX1487C/D
Manufacturer:
Maxim Integrated
Description:
RS-422/RS-485 Interface IC Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
Lifecycle:
New from this manufacturer.
Delivery:
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