MAX1480CEPI+ - Isolated RS-485/RS-422 Transceiver, 28-PDIP | Analog Devices
MPN: MAX1480CEPI+ ✓ NakahandaMAX1480CEPI+ Ulas
An isolated RS-485/RS-422 transceiver is a differential line-driver and differential receiver combined with a galvanic isolation barrier. It sits in the interface hierarchy between a host UART or micro-controller and a long, noisy differential cable: interface IC -> line transceiver -> RS-485/RS-422 physical layer -> industrial control network. Isolation protects the host from ground-potential differences and surge events common in building control, HVAC and factory automation networks.
Key characteristics of the MAX1480CEPI+ include reduced-slew-rate driver outputs (shared with the MAX1480B and MAX1480C variants) that minimize radiated EMI on the bus, a half-duplex 1/1 driver/receiver arrangement, and an industrial temperature grade in a through-hole rectangular DIP package. Because the C variant is specified for reduced EMI rather than maximum raw data rate, it is a better fit for long cables and electrically noisy installations than the faster MAX1480A.
Internally, the MAX1480 series combines a pulse-transformer isolation barrier with driver and receiver circuitry in a single hybrid microcircuit. This topology provides reinforced isolation without optocoupler aging, and the isolation capacitance and creepage are defined by the package geometry rather than by a discrete isolation IC layout, so layout complexity at the board level stays low. Bus-side supply is generated on the isolated side, so no isolated DC-DC module is required at the board level.
Typical applications include automated test equipment (ATE), HVAC and building-control networks, industrial-control local area networks, isolated RS-485/RS-422 data interfaces, and isolated transceiver links for EMI-sensitive equipment. The 28-pin through-hole package also suits legacy industrial boards, long-lifecycle instruments and field-upgrade programs where SMD parts are impractical.
Design consideration: the isolation barrier means the bus-side ground is electrically separate from logic ground, so the bus-side return must be routed to a dedicated isolated ground plane that joins the shield at a single point. Also verify that the data rate, common-mode range and isolation withstand voltage of your chosen variant match your bus before substituting across the A/B/C grades.
This page consolidates manufacturer and distributor data for MAX1480CEPI+, pin-compatible drop-in alternatives from the MAX1480 family, and practical design notes on isolation, grounding and EMI that are not presented together in the original datasheet listings.
Mga alternatibo na pwedeng ilagay na MAX1480CEPI+ — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
Variante sa Seri na ito
Katulad na modelo sa serye na katugma sa pagpasok MAX1480CEPI+ (parehas na form factor at footprint) — pagkakaiba sa Package, Driver Slew Rate, Isolation, Product Type, RoHS Status.
MAX1480CCPI+
✅ Drop-InMagkontak para sa presyo
Tingnan ang Datasheet →MAX1480BCPI+
✅ Drop-InMagkontak para sa presyo
Tingnan ang Datasheet →MAX1480BEPI+
✅ Drop-InMagkontak para sa presyo
Tingnan ang Datasheet →MAX1480CCPI
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
MAX1480AEPI
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
MAX1480CEPI+ Mga Spesipikasyon
| Product Type | 1/1 Transceiver Half (isolated RS-485/RS-422 interface) |
| Supported Standards | RS-485, RS-422 |
| Isolation | Electrically isolated (hybrid microcircuit with isolation barrier) |
| Supply Architecture | Single +5 V supply on the logic side powers both sides of the interface |
| Packhaging | 28-PDIP (28-pin plastic DIP, through-hole) |
| Bilang ng Pins | 28 |
| Uri ng Pagpapasok | Through-hole |
| Package Code / Shape | DIP, rectangular |
| Temperature Grade | Industrial |
| Driver Configuration | Half-duplex, 1 driver / 1 receiver |
| Driver Slew Rate | Reduced-slew-rate drivers (MAX1480B/C feature) to minimize EMI |
| Family Variants | MAX1480A / MAX1480B / MAX1480C share the 28-pin DIP package |
| Tindminan RoHS | unknown |
Gabay sa Pin Configuration ng MAX1480CEPI+ dip, rectangular
Pin configuration para sa MAX1480CEPI+ (dip, rectangular package). Ang pagnunumero ng pin, mga function, at connection diagram ay tinukoy sa datasheet ng manufacturer. Sumangguni dito para sa eksaktong footprint at mga alituntunin sa soldering.
Wala ng detalyadong pinout data na magagamit para sa MAX1480CEPI+.
Sumangguni sa datasheet para sa buong pin configuration.
Tipikal na mga Gamit
MAX1480CEPI+ ay nararapat para sa 6 aplikasyons: HVAC and Building Control Networks, Automated Test Equipment (ATE), Industrial-Control Local Area Networks, EMI-Sensitive Instrument and Sensor Interfaces, Isolated RS-422 Point-to-Point Links, Field-Service and Legacy Equipment Upgrades.
HVAC and Building Control Networks
The MAX1480CEPI+ suits building-control panels where RS-485 buses run between floors, chillers and rooftop units over long cables with significant ground offsets. The electrically isolated barrier lets the controller UART talk to the bus without tying building ground to logic ground, protecting the MCU from transients on the HVAC wiring. Because the C grade uses reduced-slew-rate drivers, radiated emissions stay low in equipment rooms crowded with relays and contactors. A single +5 V logic-side supply powers both sides of the interface, so no isolated DC-DC module is needed next to the transceiver, keeping the BOM and board area small for cost-sensitive building controllers.
Inirekomenda
Automated Test Equipment (ATE)
In ATE fixtures, the MAX1480CEPI+ connects the tester controller to instrument and DUT-interface boards that often sit at different earth potentials. Isolation prevents the tester's precision ground from being dragged onto a miswired or noisy DUT interface, avoiding measurement errors and damage to sensitive fixtures. The 28-pin through-hole DIP is convenient for fixture builders who prefer socketed, serviceable parts over fine-pitch SMD. Analog Devices explicitly lists automated test equipment among the target applications for the MAX1480 family. Reduced-slew-rate drivers also limit edge energy on long fixture cables where reflections and crosstalk would otherwise distort high-speed test data.
Inirekomenda
Industrial-Control Local Area Networks
The MAX1480CEPI+ is a natural fit for PLC and industrial-controller RS-485 field buses such as Modbus RTU networks in factories. Field buses frequently span separate galvanic domains between a control cabinet, remote I/O and motor-drive stations, so the isolated hybrid microcircuit protects the controller from common-mode surge events typical of motor environments. The single +5 V logic-side supply architecture simplifies certification and reduces the isolated-side component count compared with discrete isolator-plus-transceiver solutions. The 28-pin DIP through-hole package is long established in industrial control boards, which eases repair and obsolescence management across multi-year product lifecycles.
Inirekomenda
EMI-Sensitive Instrument and Sensor Interfaces
When an isolated RS-485 link has to run next to precision analog or RF circuitry, the reduced-slew-rate driver of the MAX1480CEPI+ is the key advantage: slower edges radiate far less energy than a high-speed driver, reducing the need for extra shielding and filtering. Isolation also removes galvanic injection of noise from the bus into sensitive measurement front-ends. This is why Analog Devices markets the MAX1480 family for isolated RS-485/RS-422 data interfaces for EMI-sensitive applications. The trade-off is data rate: engineers should confirm the C grade's maximum signaling rate covers the required bus throughput, since the MAX1480A exists specifically for 2.5 Mbps links.
Inirekomenda
Isolated RS-422 Point-to-Point Links
The MAX1480CEPI+ also supports RS-422 operation, which uses the same differential driver and receiver in a full-duplex, point-to-point topology rather than the multi-drop half-duplex arrangement of RS-485. That makes it a good fit for isolated links between two systems separated by building floors, machine cells or process areas, where the two endpoints can sit at different ground potentials. Isolation removes the need for a separate digital isolator in the data path, and the reduced-slew-rate edge rate keeps emissions low on long twisted-pair runs. Where the bus is short and grounding is guaranteed, a simpler non-isolated transceiver such as an SN75174-based solution is cheaper and adequate.
Inirekomenda
Field-Service and Legacy Equipment Upgrades
The MAX1480CEPI+ 28-pin through-hole DIP form factor is valuable in field-service programs that must repair or retrofit industrial equipment built years ago. Through-hole parts tolerate less-than-ideal rework handling and can be socketed for quick replacement, whereas most modern isolated transceivers are only offered in surface-mount packages. The MAX1480 family remains actively offered with distributor stock and published pricing, and Abacus Technologies lists MAX1480BCPI+ and MAX1480CCPI+ as functional equivalents for continuity of supply. For cost-sensitive volume designs, however, a modern SOIC isolated transceiver such as the ISO1500 can offer smaller area and lower unit price.
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for MAX1480CEPI+ — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang Producto | MAX1480CCPI+ | MAX1480BCPI+ | MAX1480BEPI+ | MAX1480CCPI | MAX1480AEPI |
|---|---|---|---|---|---|---|
| Package | 28-PDIP (through-hole) | 28-PDIP (through-hole) - same | 28-PDIP (through-hole) - same | 28-PDIP (through-hole) - same | 28-PDIP (through-hole) - same | 28-PDIP (through-hole) - same |
| Brand | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) |
| Transceiver Configuration | 1/1 half-duplex | 1/1 half-duplex | 1/1 half-duplex | 1/1 half-duplex | 1/1 half-duplex | 1/1 half-duplex |
| Supported Standards | RS-485 / RS-422 | RS-485 / RS-422 | RS-485 / RS-422 | RS-485 / RS-422 | RS-485 / RS-422 | RS-485 / RS-422 |
| Isolation | Electrically isolated hybrid microcircuit | Electrically isolated | Electrically isolated | Electrically isolated | Electrically isolated | Electrically isolated |
| Driver Slew Rate / EMI Behavior | Reduced slew rate, minimized EMI | Reduced slew rate, minimized EMI | Reduced slew rate, minimized EMI | Reduced slew rate, minimized EMI | Reduced slew rate, minimized EMI | High-speed grade (2.5 Mbps class), higher EMI |
| Supply Architecture | Single +5 V logic-side supply powers both sides | Single +5 V logic-side supply | Single +5 V logic-side supply | Single +5 V logic-side supply | Single +5 V logic-side supply | Single +5 V logic-side supply (4.5 V class operation) |
| Temperature Grade | Industrial | Industrial | Industrial | Industrial | Industrial | Industrial |
| Mounting Type | Through-hole | Through-hole | Through-hole | Through-hole | Through-hole | Through-hole |
| Cross-Reference Status | Reference part | Listed equivalent/alternate by Abacus Technologies | Listed equivalent/alternate by Abacus Technologies | Compared as equivalent on FindIC | Compared as equivalent on Findchips | Listed as completely replaceable on FindIC |
Pangunahing mga Pagkakaiba
- All-in-one isolation in a single 28-pin DIP hybrid microcircuit, eliminating a discrete isolator and isolated DC-DC module (kumpara saISO1500DBQ)
- Reduced-slew-rate driver edges for lower radiated EMI in EMI-sensitive installations (kumpara saMAX1480AEPI)
- Through-hole 28-pin DIP packaging for legacy industrial boards, socketed repairability and field-service continuity (kumpara saMAX1490A)
- Same 28-pin footprint and identical isolation architecture across MAX1480A/B/C grades, enabling grade-to-grade replacement without PCB rework (kumpara saMAX1480BCPI+)
Talaan ng Disenyo
The MAX1480CEPI+ is an isolated device, so the bus-side ground (isolated ground) must be a separate copper pour that connects to the logic ground only at one defined point, typically at the cable shield or chassis entry. Route the twisted-pair A/B differential pair as a tightly coupled pair with a continuous reference plane over its entire length, keep the pair away from switching nodes and relay contacts, and terminate the bus at both physical ends with the termination and fail-safe biasing values specified in the family datasheet. Do not tie the isolated-side ground to chassis at multiple points, as that reintroduces the ground loop the isolation barrier was added to break.
The MAX1480C grade uses reduced-slew-rate drivers specifically to minimize radiated EMI on the bus, which is the main reason to choose the C over the faster MAX1480A grade in noisy industrial cabinets. To take full advantage of that behavior, keep the bus traces short on the PCB, avoid stub branches longer than the datasheet allows, and place the termination network close to the transceiver pins. If emissions testing fails, first check edge-rate-driven overshoot on the A/B nets and the length of any test cables attached to the fixture, then consider adding a common-mode choke in series with the bus rather than reverting to a faster driver grade.
Because a single +5 V supply on the logic side powers both the logic and the isolated bus side of the MAX1480CEPI+, the decoupling strategy on the VCC pin carries the combined load of the isolated-side bias and the local receiver. Place a low-ESR ceramic capacitor at the device supply pins with the shortest possible ground return, and add bulk capacitance near the source of the 5 V rail to absorb the switching-like current pulses associated with driver transitions on the bus side. Keep the isolated-side ground plane free of logic return currents, otherwise the isolation barrier's common-mode capability is wasted and the bus loses noise immunity.
A frequent field failure pattern is substituting a MAX1480 variant without checking the speed grade: moving from the reduced-slew-rate MAX1480C to the 2.5 Mbps-class MAX1480A raises bus edge energy and can break EMC compliance on an already-approved installation. Another common mistake is treating the isolated bus ground as ordinary signal ground, which reinstates ground loops and defeats the purpose of the isolated package. Verify maximum data rate, common-mode range, isolation withstand voltage and supply tolerance against the specific grade on the manufacturer datasheet before any substitution, and confirm the +5 V supply tolerance at the transceiver pins under worst-case bus loading.
Impormasyon ng Pagsunod sa Kautusan
No explicit RoHS, REACH, AEC-Q100 or lead-free statements appear in the verified web data for MAX1480CEPI+. The part is an industrial-grade isolated interface IC, not an automotive-qualified device, so AEC-Q100 is not applicable. Compliance must be confirmed from the Analog Devices MAX1480C product page or the family datasheet before release.
