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Analog Devices Inc./Maxim Integrated MAX3111EEWI
- Part No.:
- MAX3111EEWI
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Controllers
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX3111EEWI.pdf
- Description:
- IC TXRX RS232 SPI W/CAP 28-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,212
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Product details
Overview
MAX3111EEWI from Maxim Integrated is a 28-pin SOIC IC integrating a SPI/MICROWIRE-compatible UART and ±15kV ESD-protected dual RS-232 transceiver with internal charge-pump capacitors. It operates from +3.0V to +3.6V, delivers true RS-232 output voltage levels down to VCC = +3V, supports up to 230kbps data rate, and consumes only 600µA in active mode - enabling compact, low-power serial interfaces in battery-powered industrial handhelds and POS terminals.
For engineers reviewing the MAX3111EEWI datasheet, MAX3111EEWI pinout, MAX3111EEWI application, or MAX3111EEWI equivalent, this page provides verified functional specifications, validated pin-level circuit roles, confirmed UART/RS-232 coexistence behavior, and real-world design implications for space-constrained 3.3V embedded systems requiring robust ESD-hardened serial connectivity.
Technical Context
The MAX3111EEWI implements a full-duplex SPI/QSPI (CPOL=0, CPHA=0)/MICROWIRE UART with 8-word receive FIFO, software-programmable baud-rate generator (300–230kbaud), and 9-bit address recognition interrupt logic. Its UART core interfaces microcontroller synchronous serial data to asynchronous RS-232/IrDA streams without external clock sources, using an integrated crystal oscillator or CMOS clock input at X1/X2.
The RS-232 transceiver features two drivers (T1OUT/T2OUT) and two receivers (R1OUT/R2OUT), powered by on-chip charge pumps generating ±5.4V from 3.3V supply. Receivers remain active during hardware shutdown (10µA), allowing wake-on-RX functionality, while proprietary low-dropout output stages maintain EIA/TIA-232 compliance across temperature and load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply Range | +3.0V to +3.6V - enables direct interface with 3.3V microcontrollers without level-shifting or LDO overhead. |
| Max Data Rate | 230kbps (guaranteed) - supports high-speed diagnostic port communication and real-time telemetry in industrial front panels. |
| ESD Protection | ±15kV IEC 1000-4-2 air/contact - eliminates need for external TVS diodes on RS-232 lines in harsh environments. |
| Active Supply Current | 600µA typical - reduces thermal load and extends battery life in handheld equipment operating continuously at 115.2kbps. |
| Shutdown Current | 10µA with receiver interrupt active - allows monitoring of external RS-232 activity while preserving system sleep state. |
| UART FIFO Depth | 8-word receive FIFO - lowers CPU interrupt frequency and minimizes processor overhead in interrupt-driven firmware. |
| Transceiver Outputs | 2 drivers / 2 receivers - supports full-duplex RS-232 with hardware handshaking (RTS/CTS) on a single 28-pin package. |
Pinout & Package
MAX3111EEWI uses a 28-pin Wide SO (SOIC) package with 0.3-inch body width and standard 1.27mm pitch. All pins are electrically validated per Maxim's official datasheet Rev 2 (2/15).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | R2IN / R2OUT | Second RS-232 receiver input and TTL/CMOS output - enables dual-channel serial monitoring or redundant link support. |
| 3, 4 | T2IN / T1IN | Second and first TTL/CMOS transmitter inputs - accepts asynchronous UART TX data and RTS control signals directly from µC GPIO. |
| 5, 6 | R1OUT / R1IN | Primary RS-232 receiver output and input - connects to DB-9 pin 3 (RXD) and pin 8 (DCD) for standard PC-compatible wiring. |
| 7, 8 | T1OUT / VCC | Main RS-232 transmitter output and +3.3V power supply - T1OUT drives DB-9 pin 2 (TXD); VCC powers both UART and transceiver sections. |
| 9, 10 | X2 / X1 | Crystal oscillator connections - X1 accepts 1.8432MHz crystal or CMOS clock; X2 left unconnected when external clock used. |
| 11–14 | CTS / RTS / RX / TX | UART control and data I/O - CTS/RTS enable hardware flow control; RX/TX handle bidirectional async serial data with FIFO buffering. |
| 15–19 | DIN / DOUT / SCLK / CS / IRQ | SPI interface and interrupt - DIN/DOUT/SCLK/CS implement full-duplex 16-bit SPI; IRQ is open-drain active-low interrupt to µC. |
| 20–28 | SHDN / V+ / C1+ / C1- / C2+ / C2- / V- / GND / T2OUT | Power management and charge-pump nodes - SHDN enables hardware shutdown; V+/V- are internally generated ±5.4V rails; T2OUT is second RS-232 driver output. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated UART + RS-232 Transceiver | Eliminates separate UART IC and line driver, reducing BOM count by ≥3 components and PCB area by >40% vs discrete solutions. |
| Internal Charge-Pump Capacitors | No external capacitors required for ±5.4V generation - removes four 1µF ceramic caps and associated layout constraints. |
| Hardware/Software Shutdown | 10µA shutdown current with receiver monitoring enabled - supports wake-on-RX in portable devices without external wake logic. |
| SPI/QSPI/MICROWIRE Compatibility | Single 16-bit word protocol with CPOL=0/CPHA=0 timing - simplifies firmware integration with ARM Cortex-M, PIC, and MSP430 MCUs. |
| 8-Word Receive FIFO | Reduces UART interrupt frequency by up to 8× compared to single-byte buffers - improves deterministic response in RTOS-based systems. |
Applications
| Point-of-Sale (POS) Terminals | Industrial Handheld Scanners |
|---|---|
Use Scenario: Compact retail terminal connecting to receipt printers and barcode scanners via RS-232. IC Role / Device Role / Timing Role: UART handles printer command framing and scanner data parsing; RS-232 transceivers drive legacy peripherals at 9600–115.2kbps. Use Value: Single-chip solution replaces UART + MAX232 + level shifters, cutting board space by 35% and eliminating 6 passive components. |
Use Scenario: Ruggedized inventory scanner with battery life target >12 hours per charge. IC Role / Device Role / Timing Role: Low-power UART manages Bluetooth bridge firmware; RS-232 interface connects to warehouse docking stations. Use Value: 600µA active current and 10µA shutdown enable multi-day operation; ±15kV ESD protects against static discharge during field use. |
| Telecom Diagnostic Ports | Front-Panel Serial Interfaces |
Use Scenario: Field-service port on DSLAM or ONU equipment for firmware updates and log retrieval. IC Role / Device Role / Timing Role: Provides isolated, ESD-hardened RS-232 link between service laptop and embedded Linux host. Use Value: Guaranteed 230kbps operation ensures fast firmware upload (<30s for 1MB image); internal capacitors simplify conformal coating process. |
Use Scenario: Operator interface on PLC or HMI panel requiring local configuration via serial console. IC Role / Device Role / Timing Role: Dual RS-232 channels support simultaneous debug (R1IN/R1OUT) and peripheral control (R2IN/R2OUT). Use Value: Two independent transceivers eliminate need for multiplexer or second IC; 28-pin SO fits tight front-panel PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UART + RS-232 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3222ECAE+ | 3.0–5.5V supply; no integrated UART; requires external µC UART; 2-driver/2-receiver; ±15kV ESD. | Used where existing µC has UART but needs robust RS-232 physical layer - not suitable for UART-offload or space-constrained designs. | Select when RS-232 interface must be added to a system with available UART pins and layout space for external charge-pump caps. |
| SP3223ECA-L | 3.0–5.5V supply; no integrated UART; 2-driver/2-receiver; ±15kV ESD; requires 4× 0.1µF external caps. | Targeted at cost-sensitive industrial controls where µC handles all protocol logic and board space permits discrete cap placement. | Choose when BOM cost is prioritized over component count and PCB area, and when µC resources are sufficient for full UART stack. |
Compared with MAX3222ECAE+ and SP3223ECA-L, the MAX3111EEWI uniquely integrates UART logic and RS-232 transceivers with internal capacitors - reducing total component count by 4–6 parts, eliminating capacitor layout dependencies, and enabling UART offload in resource-constrained microcontrollers.
Availability
MAX3111EEWI is available at Aetrix Electronics and suitable for point-of-sale terminals, industrial handheld scanners, telecom diagnostic ports, and front-panel serial interfaces requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for MAX3111EEWI includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX3111EEWI belongs to Maxim's RS-232 interface and UART product line, designed specifically for space- and power-constrained embedded systems needing integrated, ESD-hardened serial connectivity without external passive components.
FAQ
What is the operating voltage range for MAX3111EEWI?
The MAX3111EEWI operates from +3.0V to +3.6V, making it compatible with standard 3.3V logic systems. This supply range enables direct connection to 3.3V microcontrollers without level translation, and guarantees full RS-232 output voltage swing (±5.4V) and 230kbps data rate across the entire range. The MAX3111EEWI is not rated for 5V operation - using VCC > +3.6V may cause permanent damage.
Does MAX3111EEWI require external capacitors for RS-232 voltage generation?
No, the MAX3111EEWI integrates all charge-pump capacitors internally. Unlike legacy RS-232 transceivers such as MAX232 or MAX3222, it requires zero external capacitors to generate ±5.4V from a 3.3V supply. This eliminates four 1µF ceramic capacitors, reduces PCB footprint, simplifies layout, and improves reliability in vibration-prone or conformally coated applications.
How does the shutdown mode of MAX3111EEWI function?
The MAX3111EEWI supports both hardware and software shutdown. Driving SHDN pin low disables the RS-232 charge pumps while keeping the UART active (10µA). Writing SHDNi = 1 to the configuration register disables both UART and transceivers (3µA). In either mode, the receiver remains sensitive to incoming RS-232 transitions and can assert IRQ to wake the host µC - a key feature for battery-powered MAX3111EEWI deployments.
What is the maximum guaranteed data rate for MAX3111EEWI?
The MAX3111EEWI is guaranteed to operate at up to 230kbps while maintaining full EIA/TIA-232 output voltage levels (±5V minimum) and signal integrity across temperature and load. Electrical characteristics confirm operation up to 250kbps under typical conditions, but 230kbps is the production-tested, datasheet-guaranteed limit for reliable interoperability with standard RS-232 receivers.
Is MAX3111EEWI pin-compatible with MAX3100 or MAX3222E?
The MAX3111EEWI is hardware- and software-compatible with the MAX3100 UART, sharing identical SPI register maps and timing. However, it is not pin-compatible with MAX3222E - the latter is RS-232-only (no UART), uses different pin functions (e.g., no X1/X2 crystal pins), and has distinct power and ground pin placements. Direct replacement requires PCB redesign; MAX3111EEWI serves a fundamentally different integration role than MAX3222E.
MAX3111EEWI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Programmable:
- Not Verified
- Protocol:
- RS232, RS485
- Function:
- Controller
- Interface:
- SPI, UART
- Standards:
- -
- Voltage - Supply:
- 3V ~ 3.6V
- Current - Supply:
- 600µA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SOIC
- Grade:
- -
- Qualification:
- -
MAX3111EEWI FAQ
1.How can I place an order for MAX3111EEWI through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX3111EEWI on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX3111EEWI reliable?
The price and inventory of MAX3111EEWI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX3111EEWI is usually 5 days.
3.What payment methods are accepted for MAX3111EEWI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX3111EEWI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX3111EEWI?
MAX3111EEWI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX3111EEWI order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX3111EEWI?
For technical support, including MAX3111EEWI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX3111EEWI requirements.
6.How does Aetrix verify that MAX3111EEWI is sourced from the original manufacturer or authorized distributors?
All MAX3111EEWI products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX3111EEWI meets industry standards.
7.What is the process for return or replacement of MAX3111EEWI?
All MAX3111EEWI units undergo pre-shipment inspection (PSI). If there is an issue with MAX3111EEWI, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX3111EEWI part is unused and in its original packaging.
Return procedure for MAX3111EEWI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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