仕様
| 属性 | 値 |
| Package | Tube |
| ProductStatus | Obsolete |
| Type | Transceiver |
| Protocol | RS422, RS485 |
| NumberofDrivers/Receivers | 1/1 |
| Duplex | Half |
| ReceiverHysteresis | 70 mV |
| DataRate | 250kbps |
| Voltage-Supply | 4.75V ~ 5.25V |
| OperatingTemperature | 0°C ~ 70°C |
| MountingType | Surface Mount |
| Package/Case | 8-SOIC (0.154, 3.90mm Width) |
概要
Description
MAX487CSA is a Maxim/Analog Devices RS-485/RS-422 transceiver optimized for industrial networks. It provides a TTL/CMOS host interface (DI/RO) and a differential two-wire bus (A/B) for long-distance, multi-point serial communication. The device typically runs from a single 5 V supply and uses a 1/8 unit-load on the bus, enabling more nodes on a bus. It supports half-duplex RS-485 (via DE and /RE control), features a tri-state driver, and a receiver with a failsafe output (guaranteed HIGH when the bus is idle/open/shorted). It also includes robust protection (ESD) and is suitable for rugged environments. The CSA suffix denotes a specific 8-pin package variant. Applications include industrial controls, building automation, and data acquisition systems requiring reliable, multi-point serial links. For exact electrical specs, timing, and pinout, consult the MAX487CSA datasheet.
Equivalent
Equivalent RS-485/RS-422 transceivers (5V) from other vendors include:
- Analog Devices ADM485
- Texas Instruments SN65HVD178B / SN65HVD238
- STMicroelectronics SP485 / SP487
- Microchip MCP2551
These offer similar half-duplex RS-485/RS-422 functionality with a 5V supply.
- Analog Devices ADM485
- Texas Instruments SN65HVD178B / SN65HVD238
- STMicroelectronics SP485 / SP487
- Microchip MCP2551
These offer similar half-duplex RS-485/RS-422 functionality with a 5V supply.
Features
Key features of MAX487CSA (RS-485/RS-422 transceiver):
- 5V single‑supply operation
- Half‑duplex RS‑485/RS‑422 transceiver
- Up to several Mbps data rate (typical RS‑485 performance)
- 1/2 unit‑load driver (bus-friendly)
- Separate driver enable (DE) and receiver enable (RE) with tri‑state outputs
- Fail‑safe receiver: guaranteed high output on open/shorted/idle inputs
- TTL/CMOS‑compatible input thresholds
- ESD protection on bus pins
- Low quiescent current with optional shutdown for extra power saving
- 8‑pin package (CSA) form factor
Notes: Check the exact datasheet for precise speed and electrical specs for your package variant.
- 5V single‑supply operation
- Half‑duplex RS‑485/RS‑422 transceiver
- Up to several Mbps data rate (typical RS‑485 performance)
- 1/2 unit‑load driver (bus-friendly)
- Separate driver enable (DE) and receiver enable (RE) with tri‑state outputs
- Fail‑safe receiver: guaranteed high output on open/shorted/idle inputs
- TTL/CMOS‑compatible input thresholds
- ESD protection on bus pins
- Low quiescent current with optional shutdown for extra power saving
- 8‑pin package (CSA) form factor
Notes: Check the exact datasheet for precise speed and electrical specs for your package variant.
Pinout
Pin count: 8 pins.
Function: Maxim MAX487CSA is a half‑duplex RS-485/RS-422 transceiver. Pinout (typical SOIC-8):
- DI: Driver input
- RO: Receiver output
- DE: Driver enable (active high)
- /RE: Receiver enable (active low)
- A, B: Differential bus pins
- Vcc: Power supply
- Gnd: Ground
A and B carry the differential bus signals; RO outputs received data; DI drives the bus when DE is high and /RE allows the receiver when low.
Function: Maxim MAX487CSA is a half‑duplex RS-485/RS-422 transceiver. Pinout (typical SOIC-8):
- DI: Driver input
- RO: Receiver output
- DE: Driver enable (active high)
- /RE: Receiver enable (active low)
- A, B: Differential bus pins
- Vcc: Power supply
- Gnd: Ground
A and B carry the differential bus signals; RO outputs received data; DI drives the bus when DE is high and /RE allows the receiver when low.
Manufacturer
- Manufacturer: Maxim Integrated (now part of Analog Devices).
- What kind of company: A fabless semiconductor company that designs and markets analog and mixed-signal integrated circuits.
- What kind of company: A fabless semiconductor company that designs and markets analog and mixed-signal integrated circuits.
Application
MAX487CSA is a serial RS-232 transceiver. Common application areas include:
- Serial I/O for microcontrollers and embedded systems
- Interfaces between PCs/modems/printers and other equipment
- Data-logging, instrumentation, and test/measurement gear
- Industrial control, PLCs, and automation equipment
- Telecom/networking equipment requiring RS-232 control paths
- Any device needing reliable TTL/CMOS to RS-232 level translation
- Serial I/O for microcontrollers and embedded systems
- Interfaces between PCs/modems/printers and other equipment
- Data-logging, instrumentation, and test/measurement gear
- Industrial control, PLCs, and automation equipment
- Telecom/networking equipment requiring RS-232 control paths
- Any device needing reliable TTL/CMOS to RS-232 level translation
Package
8-pin SOIC (surface-mount) package.
