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MAX485CPA

Name: MAX485CPA
Rating: 4.7 (12 reviews)

IC TRANSCEIVER HALF 1/1 8PDIP

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規格

Part Status	Obsolete
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Half
Receiver Hysteresis	70 mV
Data Rate	2.5Mbps
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Mounting Type	Through Hole
Package / Case	8-DIP (0.300", 7.62mm)
Supplier Device Package	8-PDIP
Base Product Number	MAX485

概述

Description

MAX485CPA is an 8-pin, low-power, half‑duplex RS‑485/RS‑422 transceiver from Maxim Integrated (Analog Devices). It combines a differential driver and receiver on one chip for bidirectional comms over the A/B bus. Key pins: DI (data in, TTL), RO (receiver out, TTL), DE (driver enable), /RE (receiver enable, active low), and A/B (bus lines); Vcc and GND power the device. It runs on 4.75–5.25 V and supports up to about 2.5 Mbps. The receiver has a failsafe so RO goes high when the bus is idle, open, or shorted. The device is typically 1/8 unit load on the RS‑485 bus, enabling many nodes. The CPA suffix denotes the packaging variant (8‑pin plastic package) and related lead‑free/industrial options. Common applications include microcontroller interfaces to RS‑485 networks in industrial automation, building automation, and instrumentation. For proper operation, terminate the bus with 120 Ω across A–B and add biasing resistors as needed; control DE/RE to switch between transmit and receive.

Features

Here are the key features of the MAX485CPA:
- Low-power, half-duplex RS-485/RS-422 transceiver
- 5V single-supply operation
- Data rate up to 2.5 Mbps
- 1/8 unit-load receiver (supports up to 32 devices on a bus)
- Failsafe receiver: RO goes high with open, shorted, or idle inputs
- Control pins: DI (data in), DE (driver enable), RE (receiver enable, active low)
- Differential A/B bus pins and RO output
- Wide bus common-mode range (-7V to +12V)
- Available in 8-pin packages (CPA suffix indicates package style)

Package

MAX485CPA is in an 8-pin Plastic DIP (PDIP) package, i.e., a through-hole DIP-8 package.

Pinout

8 pins. It is a half‑duplex RS‑485/RS‑422 transceiver with:
- A and B: differential bus lines
- DI: data input (TTL/CMOS)
- RO: receiver output (TTL/CMOS)
- DE: driver enable
- /RE: receiver enable (active low)
- Vcc and Gnd: power pins
Provides bidirectional data transfer between a microcontroller and RS‑485 network.

Manufacturer

- Manufacturer: Maxim Integrated Products (the MAX485CPA is a part from Maxim).
- What kind of company: A U.S.-based semiconductor company that designs and manufactures analog and mixed-signal integrated circuits (Maxim is now part of Analog Devices, Inc.).

Application

MAX485CPA is a low-power RS-485/RS-422 transceiver. Typical applications:
- Industrial automation and process control
- PLCs and remote I/O
- Building/home automation (Modbus RTU, BACnet MS/TP, DMX512)
- Data acquisition and instrumentation
- Multi-point serial networks over moderate to long distances

Equivalent

Equivalent products (RS-485/RS-422 transceivers, 5V, 2-wire, half‑duplex, ~1/8 UL):
- MAX3485 (Maxim)
- TI SN75176B and SN65HVD178B
- Microchip MCP2551
- ST SP485 (SP485)
- Exar SP3485
Check datasheets for exact pinouts and electrical specs.