Part Number: MAX487CSA+T

Manufacturer: Maxim Integrated

Description: RS-422/RS-485 Interface IC Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers

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MAX487CSA+T Description

The MAX481E, MAX483E, MAX485E, MAX487E-MAX491E, and MAX1487E are all low-power RS-485/RS-422 transceivers developed for usage in demanding environments. Each driver output and receiver input is shielded against ESD surges of up to 15 kV without the need for a latch-up mechanism. There is one transmitter and one receiver in this set. Error-free data transfer at speeds up to 250kbps is made possible by the reduced slew-rate drivers included in the MAX487E, MAX488E, MAX483E, and MAX489E. All four of these devices have these drivers pre-installed.

The MAX485E, MAX481E, MAX490E, and MAX491E in the MAX1487E can transfer data at 2.5Mbps due to their open driver slew rates. When empty or fully loaded with deactivated drivers, these transceivers use a supply current of no more than 120 A. In addition, the MAX481E, MAX483E, and MAX487E each include a low-current shutdown mode that reduces their power consumption to 0.5 microamperes (A). Every component gets its power from a single source of +5V.

The current that can flow through drivers is restricted in the event of a short circuit. They are safeguarded against excessive power loss by thermal shutdown circuitry that sets their outputs in a high-impedance state. If the receiver’s input is an open circuit, the logic-high output will be maintained thanks to a fail-safe mechanism built into the receiver’s input. With a quarter-unit-load receiver input impedance, the MAX487E and MAX1487E can accommodate up to 128 transceivers on the bus. MAX488E–MAX491E are intended for use in communications that require full-duplex, whereas MAX481E–MAX487E, MAX483E–MAX485E–MAX487E, and MAX1487E are designed for use in applications that require just half-duplex. MAX481, MAX483, MAX485, MAX487–MAX491, and MAX1487 are pin-and-function-compatible devices that you should consider using for applications that are not sensitive to ESD.

Applications Information

For communications over RS-485 and RS-422, low-power transceivers such as the MAX481E/MAX483E/MAX485E/MAX487E–MAX491E and MAX1487E are available. These “E” versions of the MAX481, MAX483, MAX485, MAX487–MAX491, and MAX1487 offer increased resistance to electrostatic discharge (ESD). The MAX481E, MAX483E, MAX485E, MAX497E– MAX491E, and MAX1487E are designed for use in challenging settings where high-speed communication is an essential component. Because of these devices, there is no longer a requirement for transient suppressor diodes, along with the associated high capacitance loading. For applications in which cost is of the utmost importance, it is recommended to choose MAX481, MAX483, MAX485, MAX487–MAX491, and MAX1487 which do not contain the letter “E.”

The MAX483E, MAX487E, MAX488E, and MAX489E can broadcast and receive data at 250kbps, whereas the MAX481E, MAX485E, MAX490E, MAX491E, and MAX1487E can do 2.5Mbps.  Half-duplex transceivers include the MAX481E, MAX483E, MAX487E, and MAX1487E, while full-duplex transceivers include the MAX488E–MAX491E. In addition, the MAX481E, MAX483E, MAX485E, MAX487E, MAX489E, MAX491E, and MAX1487E all come equipped with receiver-enable (RE) and driver-enable (DE) pins. Both the driver and the receiver have high-impedance outputs when they are disabled.

● ±15kV ESD Protection

All pins on Maxim devices feature ESD-protection structures to prevent electrostatic discharges during handling and assembly. Additional static-dissipation safeguards have been added to the driver outputs and receiver inputs. Modern constructions designed by Maxim’s experts ensure that these pins are immune to ESD levels of up to 15kV. The ESD components are robust in all operational and inactive conditions.

The MAX481E, MAX483E, MAX485E, MAX487E-MAX491E, and MAX1487E from Maxim continue to function normally after exposure to an ESD incident. There are several techniques to characterize ESD protection; in this case, the Human Body Model is used to characterize this product family’s transmitter outputs and receiver inputs for protection to 15kV. IEC10004-2 contact discharge and IEC1000-4-2 air-gap discharge are two more types of electrostatic discharge (ESD) testing (formerly IEC801-2).

● ESD Test Conditions

The effectiveness of ESDs is conditional. Get in touch with Maxim to receive a reliability report detailing the procedures followed and the outcomes achieved during testing.

What is a Transceiver?

A transceiver is a device capable of sending and receiving signals and functions as both a transmitter and a receiver. However, the phrase can also refer to the transmitter/receiver hardware utilized in wired or fiber optic networks. The name is usually linked with gear used for wireless communication. The transmission and reception of various signals is this technological device’s major function.

The transceiver is integral to the NIC in local area networks (LANs). It is also able to receive signals over the network line in addition to being able to send them across the line. However, certain sorts of networks call for the use of a transceiver. In wireless mobile devices such as smartphones and cordless phones, the transceiver functions as an essential component.

What Is The Difference Between A Transmitter And A Transceiver?

A transmitter produces electromagnetic radiation or current at radio frequencies (RF). Various communication systems utilize this wave to transmit various forms of data, including sound, video, text, etc. In contrast, a transceiver can transmit and receive digital signals.

How Does A Radio Transceiver Work?

When transmitting and receiving radio signals, a transceiver can operate in either half-duplex or full-duplex mode.

● Half-Duplex Transceivers.

It’s either a transmitter or a receiver, but not both. This is since both the transmitter and receiver share a single antenna through an electronic switch. Various single-frequency communication devices, such as ham radios and walkie-talkies, operate in this mode.

● Full-Duplex Transceivers.

The radio’s sender and receiver can operate independently of one another. Multiple radio frequencies are used for transmission and receiving. These handheld and moving two-way radios exhibit this mode.


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