MAX1484EUB+ Maxim Integrated Products, MAX1484EUB+ Datasheet - Page 13

• Manufacturer Part Number: MAX1484EUB+
• Description: IC TXRX RS485/RS422 10-UMAX
• Manufacturer: Maxim Integrated Products
• Type: Transceiverr

Specifications of MAX1484EUB+

• Number Of Drivers/receivers: 1/1
• Protocol: RS422, RS485
• Voltage - Supply: 4.75 V ~ 5.25 V
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Software-Selectable, Half-/Full-Duplex, Slew-Rate-Limited,
The RS-485/RS-422 standard covers line lengths up to
4000 feet. For line lengths greater than 4000 feet, use
the repeater application shown in Figure 16.
Figures 17 and 18 show the system differential voltage
for the parts driving 4000 feet of 26AWG twisted-pair
wire into 120Ω loads.
The MAX1485/MAX1486 are designed for bidirectional
data communications on multipoint bus transmission
Figure 15. Driver Output Waveform and FFT Plot of
MAX1481/MAX1485 Transmitting a 20kHz Signal
Figure 17. MAX1481/MAX1485 System Differential Voltage at
50kHz Driving 4000 ft. of Unterminated Cable
12Mbps, RS-485/RS-422 Transceivers in µMAX Package
V
A
20dB/div
- V
RO
DI
B
0Hz
______________________________________________________________________________________
Line Length vs. Data Rate
5 s/div
250kHz/div
Typical Applications
MAX1481/4/5/6-fig17
2.5MHz
5V/div
4V/div
5V/div
lines. Figures 19 and 20 show typical network applica-
tions circuits. These parts can also be used as line
repeaters with cable lengths longer than 4000 feet
(Figure 16).
To minimize reflections, terminate the line at both ends
in its characteristic impedance, and keep stub lengths
off the main line as short as possible. The slew-rate-lim-
ited MAX1481/MAX1485 are more tolerant of imperfect
termination than the MAX1484/MAX1486.
Figure 16. Line Repeater
Figure 18. MAX1484/MAX1486 System Differential Voltage at
200kHz Driving 4000 ft. of Unterminated Cable
NOTE: RE ON MAX1481 AND MAX1484 ONLY.
V
A
- V
H/F ON MAX1485 AND MAX1486 ONLY.
RO
DI
B
H/F
RO
DE
RE
DI
D
R
1 s/div
A
B
Z
Y
120
120
MAX1481/4/5/6-fig18
MAX1481
MAX1484
MAX1485
MAX1486
5V/div
4V/div
5V/div
DATA IN
DATA OUT
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