參數(shù)資料
型號(hào)： MAX488
廠商： Maxim Integrated Products, Inc.
英文描述： Low-Power, Slew-Rate-Limited RS-485Transceivers(250kbps,全雙工, RS-485收發(fā)器)
中文描述： 低功耗、限擺率、RS-485/RS-422收發(fā)器
文件頁(yè)數(shù)： 1/16頁(yè)
文件大小： 205K
代理商： MAX488
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
_______________General Desc ription
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.
________________________Applic ations
Low-Power RS-485 Transceivers
Low-Power RS-422 Transceivers
Level Translators
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
____________________________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
______________Ordering Information
Ordering Information continued at end of data sheet.
* Contact factory for dice specifications.
M
Low-Power, S lew-Rate-Limited
RS -485/RS -422 Transc eivers
________________________________________________________________ Maxim Integrated Products
1
MAX481
MAX483
MAX485
MAX487
MAX488
MAX489
MAX490
MAX491
MAX1487
PART
NUMBER
HALF/FULL
DUPLEX
DATA RATE
(Mbps)
SLEW-RATE
LIMITED
LOW-POWER
SHUTDOWN
RECEIVER/
DRIVER
ENABLE
QUIESCENT
CURRENT
(
μ
A)
NUMBER OF
TRANSMITTERS
ON BUS
PIN
COUNT
Half
Half
Half
Half
Full
Full
Full
Full
Half
2.5
0.25
2.5
0.25
0.25
0.25
2.5
2.5
2.5
No
Yes
No
Yes
Yes
Yes
No
No
No
Yes
Yes
No
Yes
No
No
No
No
No
Yes
Yes
Yes
Yes
No
Yes
No
Yes
Yes
300
120
300
120
120
120
300
300
230
32
32
32
128
32
32
32
32
128
8
8
8
8
8
14
8
14
8
______________________________________________________________S elec tion Table
19-0122; Rev 5; 2/96
PART
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
8 Plastic DIP
8 SO
8 μMAX
Dice*
MAX481
CPA
MAX481CSA
MAX481CUA
MAX481C/D
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