MAX3485CSA+T
The MAX3485CSA+T is an electronic component from Analog Devices Inc./Maxim Integrated. View the full MAX3485CSA+T datasheet below including key specifications, pinout, electrical characteristics, absolute maximum ratings.
Manufacturer
Analog Devices Inc./Maxim Integrated
Category
Integrated Circuits (ICs)
Package
8-SOIC (0.154", 3.90mm Width)
Lifecycle
Active
Key Specifications
| Parameter | Value |
|---|---|
| Case/Package | SOIC |
| Contact Plating | Tin |
| Data Rate | 10Mbps |
| Data Rate | 10 Mbps |
| Duplex | Half |
| ESD Protection | No |
| Interface | RS-422, RS-485 |
| Lifecycle Status | Production (Last Updated: 1 week ago) |
| Logic Function | Transceiver |
| Manufacturer Lifecycle Status | PRODUCTION (Last Updated: 1 week ago) |
| Max Operating Temperature | 70 °C |
| Max Power Dissipation | 727 mW |
| Max Supply Voltage | 3.6 V |
| Min Operating Temperature | 0 °C |
| Min Supply Voltage | 3 V |
| Mount | Surface Mount |
| Mounting Type | Surface Mount |
| Nominal Supply Current | 1 mA |
| Number of Drivers | 1 |
| Number of Drivers/Receivers | 1/1 |
| Number of Pins | 8 |
| Number of Receivers | 1 |
| Number of Transceivers | 1 |
| Number of Transmitters | 1 |
| Operating Supply Voltage | 3.3 V |
| Operating Temperature | 0°C ~ 70°C |
| Output Current | 60 mA |
| Output Voltage | 12.5 V |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Propagation Delay | 22 ns |
| Protocol | RS422, RS485 |
| Radiation Hardening | No |
| REACH SVHC | Unknown |
| Receiver Hysteresis | 50 mV |
| Receiver Hysteresis | 50 mV |
| Receiver Hysteresis | 50 mV |
| RoHS | Compliant |
| Schedule B | 8542390000|8542390000|8542390000|8542390000|8542390000 |
| Simplex/Duplex | Half Duplex |
| Supplier Device Package | 8-SOIC |
| Supplier Device Package | 8-SOIC |
| Type | Transceiver |
| Type | Transceiver |
| Supply Voltage | 3V ~ 3.6V |
Overview
The MAX3440E-MAX3444E fault-protected RS-485 and J1708 transceivers feature ±60V protection from signal faults on communication bus lines. Each device contains one differential line driver with three-state output and one differential line receiver with three-state input. The 1/4-unitload receiver input impedance allows up to 128 transceivers on a single bus. The devices operate from a 5V supply at data rates of up to 10Mbps. True fail-safe inputs guarantee a logic-high receiver output when the receiver inputs are open, shorted, or connected to an idle data line.
Hot-swap circuitry eliminates false transitions on the data bus during circuit initialization or connection to a live backplane. Short-circuit current-limiting and thermal shutdown circuitry protect the driver against excessive power dissipation, and on-chip ±15kV ESD protection eliminates costly external protection devices.
The MAX3440E-MAX3444E are available in 8-pin SO and PDIP packages and are specified over industrial and automotive temperature ranges.
Features
- ±15kV ESD Protection
- ±60V Fault Protection
- Guaranteed 10Mbps Data Rate (MAX3441E/MAX3443E)
- Hot Swappable for Telecom Applications
- True Fail-Safe Receiver Inputs
- Enhanced Slew-Rate-Limiting Facilitates Error-Free Data Transmission (MAX3440E/MAX3442E/MAX3444E)
- Allow Up to 128 Transceivers on the Bus
- -7V to +12V Common-Mode Input Range
- Automotive Temperature Range (-40°C to +125°C)
- Industry-Standard Pinout
Applications
- RS-422/RS-485 Communications
- Industrial Networks
- Telecommunications Systems
- HVAC Controls
Pin Configuration
MAX3485CSA+T Pinout
Package: 8-SOIC (0.154", 3.90mm Width)
| Pin Number | Pin Name | Type | Description |
|---|---|---|---|
| 1 | FAULT | I | Fault Detection Input |
| 2 | RO | O | Receiver Output |
| 3 | DERE | I | Driver Enable / Receiver Enable (active high) |
| 4 | DI | I | Driver Input |
| 5 | GND | P | Ground |
| 6 | A | I/O | RS-485 Bus (Non-Inverting) |
| 7 | B | I/O | RS-485 Bus (Inverting) |
| 8 | VCC | P | Supply Voltage (+5V) |
Notes
- Pin 5 (GND) and Pin 8 (VCC) are power pins.
- Pins 6 (A) and 7 (B) form the differential RS-485 bus interface.
- Pin 1 (FAULT) is an input for fault detection functionality.
- Pin 3 (DERE) combines driver enable and receiver enable control; active high enables the driver, active low enables the receiver.
- Pin 2 (RO) is the receiver output; Pin 4 (DI) is the driver input.
Electrical Characteristics
(V CC = +4.75V to +5.25V, T A = T MIN to T MAX , unless otherwise noted. Typical values are at V CC = +5V and T A = +25°C.)
| PARAMETER | SYMBOL | CONDITIONS | MIN | TYP | MAX | UNITS | |
|---|---|---|---|---|---|---|---|
| DRIVER | |||||||
| Differential Driver Output | V OD | Figure 1, R L = 100Ω | Figure 1, R L = 100Ω | 2 | V CC | V | |
| Differential Driver Output | V OD | Figure 1, R L = 54Ω | Figure 1, R L = 54Ω | 1.5 | V CC | V | |
| Change in Magnitude of Differential Output Voltage | ∆V OD | Figure 1, R L = 100Ω or 54Ω (Note 2) | Figure 1, R L = 100Ω or 54Ω (Note 2) | 0.2 | V | ||
| Driver Common-Mode Output Voltage | V OC | Figure 1, R L = 100Ω or 54Ω | Figure 1, R L = 100Ω or 54Ω | V CC / 2 | 3 | V | |
| Change in Magnitude of Common-Mode Voltage | ∆V OC | Figure 1, R L = 100Ω or 54Ω (Note 2) | Figure 1, R L = 100Ω or 54Ω (Note 2) | 0.2 | V | ||
| DRIVER LOGIC | |||||||
| Driver Input High Voltage | V DIH | 2 | V | ||||
| Driver Input Low Voltage | V DIL | 0.8 | V | ||||
| Driver Input Current | I DIN | ±2 | μA | ||||
| Driver Short-Circuit Output Current | I OSD | 0V ≤ V OUT ≤ +12V | 0V ≤ V OUT ≤ +12V | +350 | mA | ||
| (Note 3) | I OSD | -7V ≤ V OUT ≤ V CC | -7V ≤ V OUT ≤ V CC | -350 | |||
| Driver Short-Circuit Foldback Output Current | I OSDF | (V CC - 1V) ≤ V OUT ≤ +12V (Note 3) | V OUT ≤ +1V (Note 3) | 25 | -25 | mA | |
| RECEIVER | RECEIVER | RECEIVER | RECEIVER | ||||
| Input Current | I A,B | A, B | V CC = GND, V A, B = 12V | 250 | μA | ||
| Input Current | I A,B | A, B | V A, B = -7V | -150 | μA | ||
| Input Current | I A,B | A, B | V A, B = ±60V | ±6 | mA | ||
| Receiver Differential Threshold Voltage | V TH | -7V ≤ V CM ≤ +12V | -7V ≤ V CM ≤ +12V | -200 | -50 | mV | |
| Receiver Input Hysteresis | ∆V TH | 25 | 25 | 25 | mV |
│
Absolute Maximum Ratings
Voltages Referenced to GND
| Parameter | Limit |
|---|---|
| V CC | +7V |
| FAULT, DE/RE, RE , DE, DE , DI, TXD | -0.3V to (V CC + 0.3V) |
| A, B (Note 1) | ±60V |
| RO | -0.3V to (V CC + 0.3V) |
| Short-Circuit Duration (RO, A, B) | Continuous |
| Continuous Power Dissipation (T A = +70°C) | |
| SO (derate 5.9mW/°C above +70°C) | 471mW |
| PDIP (derate 9.09mW/°C above +70°C) | 727mW |
Package Information
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages . Note that a '+', '#', or '-' in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
| PACKAGE TYPE | PACKAGE CODE | OUTLINE NO. | LAND PATTERN NO. |
|---|---|---|---|
| 8 SO | S8+4 | 21-0041 | 90-0096 |
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