MAX1487CPA Low-Power RS-485/RS-422 Transceiver DIP-8 (MAX1487CPA IC)
The MAX1487CPA is a high-performance, low-power transceiver designed for RS-485 and RS-422 serial communication. Housed in a standard 8-pin DIP package, it features one driver and one receiver optimized for half-duplex applications. A key advantage of the MAX1487 is its 1/4 unit-load receiver input impedance, which allows up to 128 transceivers to be connected to a single bus without signal degradation. It operates at data rates up to 2.5Mbps and includes integrated thermal shutdown protection and short-circuit current limiting.
This IC is a reliable choice for industrial local area networks and level translators. It is frequently sourced by electronics professionals in India for building robust communication interfaces in EMI-sensitive environments, as it offers a balanced mix of high speed and low quiescent current consumption.
Key Features
- High Device Density: Supports up to 128 devices on a single bus due to quarter-unit loading.
- Fast Data Rate: Capable of error-free transmission up to 2.5Mbps.
- Low Power: Consumes as little as 230uA of quiescent current.
- Half-Duplex Operation: Optimized for bi-directional data flow on a single pair of wires.
- Robust Protection: Features thermal shutdown and driver short-circuit current limiting.
- Single 5V Supply: Operates on standard digital logic voltage levels.
- Fail-Safe Receiver: Guarantees a logic-high output if the receiver inputs are open circuit.
Specifications
- IC Type: RS-485 / RS-422 Transceiver
- Data Rate: 2.5Mbps (Max)
- Supply Voltage (VCC): 4.75V to 5.25V
- Receiver Hysteresis: 70mV
- Common-Mode Input Range: -7V to +12V
- Duplex: Half-Duplex
- Package Type: PDIP-8 (Through-Hole)
- Operating Temperature: 0 to +70 degrees Celsius
Pinout Configuration
- Pin 1 (RO): Receiver Output
- Pin 2 (RE/): Receiver Output Enable (Active Low)
- Pin 3 (DE): Driver Output Enable (Active High)
- Pin 4 (DI): Driver Input
- Pin 5 (GND): Ground
- Pin 6 (A): Non-Inverting Receiver Input / Driver Output
- Pin 7 (B): Inverting Receiver Input / Driver Output
- Pin 8 (VCC): Positive Supply (+5V)
