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MAX491MJD の電気的特性と機能

MAX491MJDのメーカーはMaxim Integratedです、この部品の機能は「Low-Power / Slew-Rate-Limited RS-485/RS-422 Transceivers」です。


製品の詳細 ( Datasheet PDF )

部品番号 MAX491MJD
部品説明 Low-Power / Slew-Rate-Limited RS-485/RS-422 Transceivers
メーカ Maxim Integrated
ロゴ Maxim Integrated ロゴ 




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MAX491MJD Datasheet, MAX491MJD PDF,ピン配置, 機能
19-0122; Rev 5; 2/96
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.
____________________________Features
o In µMAX Package: Smallest 8-Pin SO
o Slew-Rate Limited for Error-Free Data
Transmission (MAX483/487/488/489)
o 0.1µA Low-Current Shutdown Mode
(MAX481/483/487)
o Low Quiescent Current:
120µA (MAX483/487/488/489)
230µA (MAX1487)
300µA (MAX481/485/490/491)
o -7V to +12V Common-Mode Input Voltage Range
o Three-State Outputs
o 30ns Propagation Delays, 5ns Skew
(MAX481/485/490/491/1487)
o Full-Duplex and Half-Duplex Versions Available
o Operate from a Single 5V Supply
o Allows up to 128 Transceivers on the Bus
(MAX487/MAX1487)
o Current-Limiting and Thermal Shutdown for
Driver Overload Protection
________________________Applications ______________Ordering Information
Low-Power RS-485 Transceivers
PART
TEMP. RANGE PIN-PACKAGE
Low-Power RS-422 Transceivers
MAX481CPA
0°C to +70°C 8 Plastic DIP
Level Translators
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
MAX481CSA
0°C to +70°C 8 SO
MAX481CUA
0°C to +70°C 8 µMAX
MAX481C/D
0°C to +70°C Dice*
Ordering Information continued at end of data sheet.
* Contact factory for dice specifications.
______________________________________________________________Selection Table
PART HALF/FULL DATA RATE SLEW-RATE LOW-POWER
NUMBER DUPLEX
(Mbps)
LIMITED SHUTDOWN
MAX481
Half
2.5
No Yes
MAX483
Half
0.25
Yes
Yes
MAX485
Half
2.5
No
No
MAX487
Half
0.25
Yes
Yes
MAX488
Full
0.25
Yes
No
MAX489
Full
0.25
Yes
No
MAX490
Full
2.5
No
No
MAX491
Full
2.5
No
No
MAX1487
Half
2.5
No
No
RECEIVER/
DRIVER
ENABLE
Yes
Yes
Yes
Yes
No
Yes
No
Yes
Yes
QUIESCENT
CURRENT
(µA)
300
120
300
120
120
120
300
300
230
NUMBER OF
TRANSMITTERS
ON BUS
32
32
32
128
32
32
32
32
128
PIN
COUNT
8
8
8
8
8
14
8
14
8
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800

1 Page





MAX491MJD pdf, ピン配列
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
MDEA,XD4I8,8R–—/ME– A=X04V89o,r VCC
120 250
MDEA,XD4I9,0R–—/ME– A=X04V91o,r VCC
300 500
No-Load Supply Current
(Note 3)
ICC M–R—E–AX=408V1/oMrAVXC4C85,
M–R—E–AX=104V87o,r VCC
DE = VCC
DE = 0V
DE = VCC
DE = 0V
500 900
300 500 µA
300 500
230 400
Supply Current in Shutdown
ISHDN
MAX483
M–R—E–AX=408V3/oMrAVXC4C87,
DE = 5V
MAX487
DE = 0V
MAX481/483/487, DE = 0V, –R—E– = 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
Receiver Short-Circuit Current
IOSD2
IOSR
-7V VO 12V (Note 4)
0V VO VCC
35 250 mA
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 = 54,
CL1 = CL2 = 100pF
10 30 60
10 30 60
Driver Output Skew to Output
tSKEW Figures 6 and 8, RDIFF = 54, CL1 = CL2 = 100pF
5 10
Driver Rise or Fall Time
tR, tF
Figures 6 and 8, MAX481, MAX485, MAX1487
RDIFF = 54,
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 = 54,
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 = 54,
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
_______________________________________________________________________________________ 3


3Pages


MAX491MJD 電子部品, 半導体
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,
MAX481; DE = RE = 0
200 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 _______________________________________________________________________________________

6 Page



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部品番号部品説明メーカ
MAX491MJD

Low-Power / Slew-Rate-Limited RS-485/RS-422 Transceivers

Maxim Integrated
Maxim Integrated


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