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參數(shù)資料
| 型號： | MAX1483EUA+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 13/14頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX RS485/RS422 LP 8-UMAX |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 1/1 |
| 規(guī)程： | RS422，RS485 |
| 電源電壓： | 4.75 V ~ 5.25 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-uMAX |
| 包裝： | 帶卷 (TR) |
MAX1482/MAX1483
__________Applications Information
The MAX1482/MAX1483 are low-power transceivers for
RS-485 and RS-422 communications. The MAX1482
and MAX1483 are specified for data rates of at least
250kbps. The MAX1482 is a full-duplex transceiver
while the MAX1483 is half duplex. When disabled, the
driver and receiver outputs are high impedance.
The 96k
, 1/8-unit-load receiver input impedance of the
MAX1482/MAX1483 allows up to 256 transceivers on a
bus, compared to the 1-unit load (12k
input imped-
ance) of standard RS-485 drivers (32 transceivers max-
imum). Any combination of MAX1482/MAX1483 and
other RS-485 transceivers with a total of 32 unit loads or
less can be put on the bus.
Reduced EMI and Reflections
The MAX1482/MAX1483 are slew-rate limited, minimiz-
ing EMI and reducing reflections caused by improperly
terminated cables. Figure 9 shows both the driver out-
put waveform of a MAX1482/MAX1483 transmitting a
125kHz signal and the Fourier analysis of that signal.
High-frequency harmonics have much lower ampli-
tudes, and the potential for EMI is significantly reduced.
20A, 18-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
8
_______________________________________________________________________________________
Figure 9. Driver Output Waveform and FFT, Transmitting
250kbps (125kHz) Signal
Figure 10. Receiver Propagation-Delay Test Circuit
Table 1. Transmitting
Table 2. Receiving
INPUTS
OUTPUTS
RE
DE
DI
Z
Y
X
1
0
1
0
X
0
1
High-Z
1
0
High-Z
X = Don't Care
High-Z = High Impedance
10dB/div
0Hz
500kHz/div
5MHz
TTL IN
tR, tF < 6ns
D
R
100pF
B
100pF
A
RECEIVER
OUT
R = 54
Z
Y
INPUTS
OUTPUT
RE
DE
*
A-B
RO
0
1
0
> +0.2V
< -0.2V
Inputs open
X
1
0
1
High-Z
X = Don't Care
High-Z = High Impedance
* DE = 0 for MAX1483 and is a Don't Care for MAX1482.
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