Behavioural mixed-signal modelMAX485ESA+max485
MAX485 RS-485 transceiver
Half-duplex RS-485 transceiver, 5 V, up to 2.5 Mbit/s. DE high: the driver puts DI differentially on A/B (A = DI, B inverted, about 2.6 V into 54 Ω). /RE low: RO shows the bus state (A − B > +200 mV = 1, < −200 mV = 0). Tie DE and /RE together for one direction pin. Terminate both ends of the bus with 120 Ω.
Key data
- Category
- ICs
- Simulation model
- Behavioural mixed-signal model
- Manufacturer part number
- MAX485ESA+
- Reference prefix
- U
- Pins
- 8
- Land pattern
- SOIC-8_3.9x4.9mm_P1.27mm
Simulation model
A behavioural model implements the interface of the chip (registers, protocol, timing) at its pins. The pins are connected to the analog circuit like CMOS pins.
- Model
- max485
- Supply pins
- 8 / 5
Pins 8
| Pin | Name | Use |
|---|---|---|
| 1 | ROOutput pin | Receiver output: to RX of the microcontroller |
| 2 | /REInput pin | Receiver enable, active low (tie to DE) |
| 3 | DEInput pin | Driver enable: high = transmit |
| 4 | DIInput pin | Driver input: from TX of the microcontroller |
| 6 | AI/O pin | Bus line A (non-inverting): 120 Ω termination at the bus ends |
| 7 | BI/O pin | Bus line B (inverting) |
| 8 | VCCSupply pin | Supply 5 V: 100 nF to GND |
| 5 | GNDGround pin | Ground |
PCB
Verified land pattern
SOIC-8_3.9x4.9mm_P1.27mm