MAX487ESA

MAX487ESA is an 8-pin Maxim/Analog Devices RS-485/RS-422 transceiver designed for half‑duplex operation on a twisted-pair differential bus. It provides a differential driver and a receiver with easy-to-use control pins (DE for driver enable, RE for receiver enable), enabling multi‑point networks with simple bus arbitration.
Key points:
- 5V single‑supply operation; supports RS‑485/RS‑422 signaling on A/B lines
- Fail‑safe receiver output (RO goes high when the bus is idle/open/shorted)
- Wide bus common‑mode range to tolerate common‑mode voltages on long cables
- Suitable for industrial/automation or building‑automation networks and other short/medium‑to‑long distance RS‑485 links
- 8‑pin package; ESA suffix indicates an 8‑pin SOIC, RoHS/lead‑free variant
In short, MAX487ESA is a compact, low‑power transceiver ideal for converting logic signals to robust differential RS‑485/RS‑422 signaling on multi‑node networks.

Equivalent devices (RS-485/RS-422 transceivers, 5 V):
- TI: SN65HVD178A (and family)
- Analog Devices: ADM485
- STMicroelectronics: ST485 (and ST3482)
- NXP: PCA82C250 (and PCA82C254)
Note: cross-compatibility depends on pinout, drive strength, data rate, and fail-safe features; consult datasheets for exact match.

Here are the typical features for the MAX487ESA (RS-485/RS-422 transceiver, extended-temp):
- Half-duplex RS-485/RS-422 transceiver (one driver, one receiver)
- 1/8 unit-load on the bus (allows more nodes on a single network)
- Separate DE (driver enable) and RE (receiver enable) controls
- Failsafe receiver: RO goes high when inputs are open, shorted, or idle
- Single-supply operation (5V) with wide input range
- Extended temperature version: -40°C to +85°C (ESA)
- TTL/CMOS-compatible DI and RO I/O
- Low power consumption (especially in standby)
- Bus protection features: ESD/overvoltage protection on the bus pins
Notes: Specific electrical parameters (data rate, exact voltages, current, thresholds) vary by device revision and package. For precise numbers, consult the MAX487ESA datasheet.

- Pin count: 8 pins.
- Function: An RS-485/RS-422 transceiver (driver and receiver) for differential 2-wire buses. Interfaces:
- A and B: differential bus lines
- DI: driver data input
- RO: receiver data output
- DE: driver enable
- /RE: receiver enable (active low)
- Vcc and Gnd
It supports half-/full-duplex operation via these pins.

Manufacturer: Maxim Integrated (now part of Analog Devices).
What kind of company: A semiconductor company that designs and manufactures analog and mixed-signal integrated circuits (e.g., power management, data converters, interfaces).

Applications of MAX487ESA (RS-485/RS-422 transceiver):
- Industrial automation and process-control networks
- Building automation, energy management, HVAC and security systems
- Remote telemetry and data acquisition (SCADA)
- PLCs, CNC machines, motor drives, and instrumentation
- Long-distance, multi-point RS-485/RS-422 networks in noisy environments

8-pin small-outline IC package (SOIC-8); RoHS compliant.