MAX3430 Maxim, MAX3430 Datasheet - Page 11

• Manufacturer Part Number: MAX3430
• Description: 80V Fault-Protected / Fail-Safe / 1/4-Unit Load / #.3V RS-485 Transceiver
• Manufacturer: Maxim

The standard RS-485 receiver input impedance is 12kΩ
(one-unit load), and a standard driver can drive up to
32-unit loads. The MAX3430 transceiver 1/4-unit-load
receiver input impedance (48kΩ) allows up to 128
transceivers connected in parallel on one communica-
tion line. Connect any combination of these devices,
and/or other RS-485 devices, for a maximum of 32 unit
loads to the line.
Applications Information
______________________________________________________________________________________
128 Transceivers on the Bus
1/4-Unit Load, +3.3V RS-485 Transceiver
±80V Fault-Protected, Fail-Safe,
The MAX3430 transceiver provides bidirectional data
communications on multipoint bus transmission lines.
Figure
The RS-485 standard covers line lengths up to 4000ft.
The signal line must be terminated at both ends in its
characteristic impedance, and stub lengths off the
main line kept as short as possible.
TRANSISTOR COUNT: 300
PROCESS: BiCMOS
10 shows a typical network applications circuit.
Chip Information
RS-485 Applications
11