MAX485
RS-485/RS-422 TransceiverThe MAX485 is a rs-485/rs-422 transceiver from Analog Devices. View the full MAX485 datasheet below including key specifications, electrical characteristics, absolute maximum ratings.
Official MAX485 datasheet (PDF) — the source this page was extracted from.
Manufacturer
Analog DevicesCategory
Interface ICsMAX485 Key Specifications
| Parameter | Value |
|---|---|
| Data Rate | 2.5 Mbps |
| Interface | RS-485/RS-422, half-duplex |
| Bus Loading | Up to 32 transceivers |
| ESD Protection | ±15kV air (transmitter outputs and receiver inputs) |
| Supply Voltage | 4.75V to 5.25V (5V single supply) |
| Driver Output Skew | 5ns |
| Driver Propagation Delay | 30ns typ (10 to 60ns) |
| Quiescent Supply Current | 300μA typ (500μA max, driver disabled) |
| Receiver Input Hysteresis | 70mV typ |
| Receiver Input Resistance | 12kΩ min |
| Storage Temperature Range | -65°C to +160°C |
| Operating Temperature Range | 0°C to +70°C |
| Driver Short-Circuit Current | 35mA to 250mA |
| Common-Mode Input Voltage Range | -7V to +12V |
| Receiver Differential Threshold | -0.2V to +0.2V |
| No-Load Supply Current (Driver Enabled) | 500μA typ, 900μA max |
| Driver Differential Output (RS-485, 27Ω Load) | 1.5V to 5V |
MAX485 Overview
Part: MAX485
Type: Low-Power RS-485/RS-422 Transceiver
Description: The MAX485 is a low-power transceiver for RS-485 and RS-422 communication, operating from a single 5V supply, supporting up to 2.5Mbps data rate, and allowing up to 32 transceivers on the bus.
Operating Conditions:
- Supply voltage: 4.75–5.25 V
- Operating temperature: 0 to +70 °C
- Max data rate: 2.5 Mbps
- Common-mode input voltage range: -7V to +12V
Absolute Maximum Ratings:
- Max supply voltage: 12 V
- Max junction/storage temperature: -65 to +160 °C
Key Specs:
- No-Load Supply Current (I CC): Typ 300 μA (DE = 0V, RE = 0V or V CC)
- Driver Output Voltage (V OD2): Min 1.5 V (R = 27Ω (RS-485))
- Receiver Differential Threshold Voltage (V TH): -0.2 V to 0.2 V (-7V ≤ V CM ≤12V)
- Receiver Input Hysteresis (V TH): Typ 70 mV (V CM = 0V)
- Receiver Input Resistance (R IN): Min 12 kΩ (-7V ≤ V CM ≤ 12V)
- Driver Input to Output Propagation delay time (t PLH, t PHL): Typ 30 ns, Max 60 ns (R DIFF = 54Ω)
- Maximum Data Rate (f MAX): 2.5 Mbps
- Driver Short-Circuit Current (I OSD1, I OSD2): Min 35 mA, Max 250 mA (-7V ≤ V O ≤ 12V)
Features:
- Low Quiescent Current: 300μA
- -7V to +12V Common-Mode Input Voltage Range
- Three-State Outputs
- 30ns Propagation Delays, 5ns Skew
- Operate from a Single 5V Supply
- Allows up to 32 Transceivers on the Bus
- Data rate: 2.5 Mbps
- Current-Limiting and Thermal Shutdown for Driver Overload Protection
- The transmitter outputs and receiver inputs are protected to ±15kV Air ESD
Applications:
- Low-Power RS-485 Transceivers
- Low-Power RS-422 Transceivers
- Level Translators
- Transceivers for EMI-Sensitive Applications
- Industrial-Control Local Area Networks
Package:
- SOP8L
- DIP8L
MAX485 Features
- Low Quiescent Current: 300μA
- -7V to +12V Common-Mode Input Voltage Range
- Three-State Outputs
- 30ns Propagation Delays, 5ns Skew
- Operate from a Single 5V Supply
- Allows up to 32 Transceivers on the Bus
- Data rate: 2.5 Mbps
- Current-Limiting and Thermal Shutdown for Driver Overload Protection
- The transmitter outputs and receiver inputs are protected to ±15kV Air ESD
MAX485 Pin Configuration
MAX485 Electrical Characteristics
(VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2)
| Parameter | Symbol | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Differential Driver Output (no load) | V OD1 | 5 | V | |||
| Differential Driver Output (with load) | V OD2 | R = 50Ω (RS-422) | 2 | |||
| Differential Driver Output (with load) | V OD2 | R = 27Ω (RS-485), Figure 3 | 1.5 | 5 | V | |
| Change in Magnitude of Driver Differential Output Voltage for Complementary Output States | V OD | R = 27Ω or 50Ω, Figure 3 | 0.2 | V | ||
| Driver Common-Mode Output Voltage | V OC | R = 27Ω or 50Ω, Figure 3 | 3 | V | ||
| Change in Magnitude of Driver Common-Mode Output Voltage for Complementary Output States | V OD | R = 27Ω or 50Ω, Figure 3 | 0.2 | V | ||
| Input High Voltage | V IH | DE,DI, RE | 2 | |||
| Input Low Voltage | V IL | DE,DI, RE | 0.8 | V | ||
| Input Current | I INI | DE,DI, RE | ±2 | μA |
MAX485 Absolute Maximum Ratings
| Parameter | Symbol | Value | Unit |
|---|---|---|---|
| Supply Voltage | V CC | 12V | V |
| Control Input Voltage | V CIV | -0.5 to (V CC +0.5) | V |
| Driver Input Voltage | DI | -0.5 to (V CC +0.5) | V |
| Driver Output Voltage (A, B) | DO | -8 to +12.5 | V |
| Receiver Input Voltage (A, B) | V RIV | -8 to +12.5 | V |
| Receiver Output Voltage | RO | -0.5 to (V CC +0.5) | V |
| 8-Pin PlasticDIPContinuousPower Dissipation (derating9.09mW/°C above+70°C) | P DIP | 727 | mW |
| 8-Pin SOP Continuous Power Dissipation (derating 5.88mW/°C above +70°C) | P SOP | 471 | mW |
| Operating Temperature Range | T A | 0 to +70 | R C |
| Storage Temperature Range | T STG | -65 to +160 | R C |
| Lead Temperature, 10 sec | T L | +300 | R C |
MAX485 Typical Application
Figure 2. Typical Circuit
Figure 2. Typical Circuit
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All Interface ICs datasheetsAll Analog Devices datasheets (713)
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