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MAX491 の電気的特性と機能

MAX491のメーカーはMaxim Integratedです、この部品の機能は「Slew-Rate-Limited RS-485/RS-422 Transceivers」です。


製品の詳細 ( Datasheet PDF )

部品番号 MAX491
部品説明 Slew-Rate-Limited RS-485/RS-422 Transceivers
メーカ Maxim Integrated
ロゴ Maxim Integrated ロゴ 




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MAX491 Datasheet, MAX491 PDF,ピン配置, 機能
MAX481/MAX483/MAX485/
MAX487–MAX491/MAX1487
Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
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
Ordering Information appears at end of data sheet.
______________________________________________________________Selection Table
PART HALF/FULL
NUMBER DUPLEX
MAX481
MAX483
MAX485
MAX487
MAX488
MAX489
MAX490
MAX491
MAX1487
Half
Half
Half
Half
Full
Full
Full
Full
Half
DATA
RATE
(Mbps)
2.5
0.25
2.5
0.25
0.25
0.25
2.5
2.5
2.5
SLEW-RATE
LIMITED
LOW-
POWER
SHUTDOWN
RECEIVER/
DRIVER
ENABLE
QUIESCENT
CURRENT
(μA)
NUMBER OF
RECEIVERS ON
BUS
No Yes Yes 300
32
Yes Yes Yes 120
32
No No Yes 300
32
Yes Yes Yes 120
128
Yes No No 120
32
Yes No Yes 120
32
No No No 300
32
No No Yes 300
32
No No Yes 230
128
PIN
COUNT
8
8
8
8
8
14
8
14
8
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.
19-0122; Rev 10; 9/14

1 Page





MAX491 pdf, ピン配列
MAX481/MAX483/MAX485/
MAX487–MAX491/MAX1487
Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
MAX488/MAX489,
DE, DI, RE = 0V or VCC
120 250
MAX490/MAX491,
DE, DI, RE = 0V or VCC
300 500
No-Load Supply Current
(Note 3)
MAX481/MAX485,
ICC RE = 0V or VCC
MAX1487,
RE = 0V or VCC
DE = VCC
DE = 0V
DE = VCC
DE = 0V
500 900
300 500 µA
300 500
230 400
Supply Current in Shutdown
ISHDN
MAX483/MAX487,
RE = 0V or VCC
DE = 5V
DE = 0V
MAX483
MAX487
MAX481/483/487, DE = 0V, RE = VCC
350 650
250 400
120 250
0.1 10 µA
Driver Short-Circuit Current,
VO = High
IOSD1 -7V VO 12V (Note 4)
35 250 mA
Driver Short-Circuit Current,
VO = Low
IOSD2 -7V VO 12V (Note 4)
35 250 mA
Receiver Short-Circuit Current
IOSR 0V VO VCC
7 95 mA
SWITCHING CHARACTERISTICS—MAX481/MAX485, MAX490/MAX491, MAX1487
(VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
Driver Input to Output
tPLH
tPHL
Figures 6 and 8, RDIFF = 54Ω,
CL1 = CL2 = 100pF
10 30 60
10 30 60
Driver Output Skew to Output
tSKEW Figures 6 and 8, RDIFF = 54Ω, CL1 = CL2 = 100pF
5 10
Driver Rise or Fall Time
tR, tF
Figures 6 and 8, MAX481, MAX485, MAX1487
RDIFF = 54Ω,
MAX490C/E, MAX491C/E
CL1 = CL2 = 100pF MAX490M, MAX491M
3
5
3
15 40
15 25
15 40
Driver Enable to Output High
Driver Enable to Output Low
tZH Figures 7 and 9, CL = 100pF, S2 closed
tZL Figures 7 and 9, CL = 100pF, S1 closed
40 70
40 70
Driver Disable Time from Low
Driver Disable Time from High
tLZ Figures 7 and 9, CL = 15pF, S1 closed
tHZ Figures 7 and 9, CL = 15pF, S2 closed
40 70
40 70
Receiver Input to Output
Figures 6 and 10, MAX481, MAX485, MAX1487
tPLH, tPHL RDIFF = 54Ω,
MAX490C/E, MAX491C/E
CL1 = CL2 = 100pF MAX490M, MAX491M
20
20
20
90 200
90 150
90 200
| tPLH - tPHL | Differential
Receiver Skew
tSKD
Figures 6 and 10, RDIFF = 54Ω,
CL1 = CL2 = 100pF
13
Receiver Enable to Output Low
tZL Figures 5 and 11, CRL = 15pF, S1 closed
Receiver Enable to Output High tZH Figures 5 and 11, CRL = 15pF, S2 closed
Receiver Disable Time from Low tLZ Figures 5 and 11, CRL = 15pF, S1 closed
20 50
20 50
20 50
Receiver Disable Time from High
Maximum Data Rate
Time to Shutdown
tHZ
fMAX
tSHDN
Figures 5 and 11, CRL = 15pF, S2 closed
MAX481 (Note 5)
20 50
2.5
50 200 600
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Mbps
ns
Maxim Integrated
3


3Pages


MAX491 電子部品, 半導体
MAX481/MAX483/MAX485/
MAX487–MAX491/MAX1487
Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
____________________________Typical Operating Characteristics (continued)
(VCC = 5V, TA = +25°C, unless otherwise noted.)
OUTPUT CURRENT vs.
DRIVER OUTPUT LOW VOLTAGE
140
120
100
80
60
40
20
0
0 2 4 6 8 10 12
OUTPUT LOW VOLTAGE (V)
OUTPUT CURRENT vs.
DRIVER OUTPUT HIGH VOLTAGE
-120
-100
-80
-60
-40
-20
0
-7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5
OUTPUT HIGH VOLTAGE (V)
MAX481/MAX485/MAX490/MAX491
SUPPLY CURRENT vs. TEMPERATURE
600
MAX481/MAX485; DE = VCC, RE = X
500
400
300
MAX485; DE = 0, RE = X,
200
MAX481; DE = RE = 0
MAX490/MAX491; DE = RE = X
100
MAX481; DE = 0, RE = VCC
0
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
MAX483/MAX487–MAX489
SUPPLY CURRENT vs. TEMPERATURE
600
MAX1487
SUPPLY CURRENT vs. TEMPERATURE
600
500 500
400 MAX483; DE = VCC, RE = X
300
MAX487; DE = VCC, RE = X
200 MAX483/MAX487; DE = RE = 0,
MAX488/MAX489; DE = RE = X
100
MAX483/MAX487; DE = 0, RE = VCC
0
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
400
300 MAX1487; DE = VCC, RE = X
200
MAX1487; DE = 0V, RE = X
100
0
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
6 Maxim Integrated

6 Page



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