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MAX491ECSD

Name: MAX491ECSD
Rating: 4.7 (12 reviews)

IC TRANSCEIVER FULL 1/1 14SOIC

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規格

Part Status	Active
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Full
Receiver Hysteresis	70 mV
Data Rate	2.5Mbps
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
Supplier Device Package	14-SOIC
Base Product Number	MAX491

概述

Description

MAX491ECSD is a Maxim Integrated (now part of Analog Devices) 5V RS-485/RS-422 transceiver. It provides a built-in driver and receiver for half‑duplex differential networks, ideal for industrial and multi-point serial links.
Key points:
- 5V single-supply, differential RS-485/RS-422 interface
- DI (data in) and RxD (data out) with TTL/CMOS compatibility
- DE and /RE controls to enable/disable the transmitter and receiver (3-state outputs)
- Fail-safe receiver output when inputs are open, shorted, or idle
- Low power and suitable for small, compact packages
- Bus pins A and B with protection features; robust operation in noisy environments
ECSD is a suffix variant indicating a specific package/temperature grade; check the datasheet for exact details on packaging, temperature range, and electrical characteristics. Typical uses include industrial automation, building control, and any RS-485 multi-point network requiring reliable, simple interfacing.

Features

MAX491ECSD Features (RS-485/RS-422 transceiver)
- Half-duplex differential driver/receiver pair (A/B) for RS-485/RS-422
- Single-supply operation at 5V
- DI/RO/DE/RE controls for easy in/out enable
- Robust protection on bus pins (A/B) and input/output
- Fail-safe receiver: RO is high when inputs are open, idle, or shorted
- Low-power operation with enables for power saving
- 8-pin package (ECSD variant) suitable for compact PCBs
- Industrial temperature range (typical) for harsh environments
Note: For exact electrical specs (data rate, drive strength, thermal, and pinout), please refer to the official MAX491ECSD datasheet.

Package

The MAX491ECSD comes in an 8-pin SOIC (D) surface-mount package.

Pinout

8 pins. Function: MAX491ECSD is a single-channel RS-485/RS-422 transceiver (half‑duplex) with a driver and a receiver. It provides DI (data in) to the differential bus (A, B) via the driver, RO (data out) from the receiver, and control pins DE (driver enable) and RE (receiver enable/bar). Used for differential bus communication.

Manufacturer

MAX491ECSD is manufactured by Maxim Integrated, which is now part of Analog Devices. Maxim Integrated was a U.S. semiconductor company that specialized in analog and mixed-signal ICs. Analog Devices is a global semiconductor company that designs and manufactures analog, mixed-signal, and DSP integrated circuits.

Application

MAX491ECSD is a low‑power RS‑485/RS‑422 transceiver. Typical applications include: industrial automation and control networks (PLCs, HMIs), building and process automation, data acquisition and telemetry, instrumentation and test equipment, and multi‑point sensor/actuator networks. Suitable for 5V systems with long cable runs in noisy environments, enabling robust differential communication.

Equivalent

MAX491ECSD is an RS-485/RS-422 transceiver. Common cross-references from other vendors include:
- Analog Devices ADM485
- Texas Instruments SN65HVD178 and SN65HVD178A
- STMicroelectronics SP485 (and SP3485)
Note: pinout, voltage, and package variations mean they’re not always direct drop‑in—check datasheets for compatibility.