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Analog Devices Inc./Maxim Integrated MAX3100EEE+
- Part No.:
- MAX3100EEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX3100EEE+.pdf
- Description:
- IC UART SPI/MICRWIRE COMP 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,647
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Product details
Overview
The MAX3100EEE+ from Maxim Integrated is a SPI/MICROWIRE-compatible universal asynchronous receiver-transmitter (UART) optimized for microcontroller-based systems. It integrates an on-chip crystal oscillator, 8-word FIFO, software/hardware shutdown (10µA), IrDA SIR timing mode, and supports baud rates up to 230.4 kbps with a 3.6864MHz crystal - enabling compact RS-232/RS-485, IR, and opto-isolated data links in handheld instrumentation and building control networks.
For engineers reviewing the MAX3100EEE+ datasheet, MAX3100EEE+ pinout, MAX3100EEE+ application, or MAX3100EEE+ equivalent, this page delivers verified technical context, real-world interface constraints (e.g., Schmitt-trigger inputs, 25mA TX/RTS sink capability), temperature-rated QSOP-16 packaging (-40°C to +85°C), and validated alternatives for low-power UART expansion in SPI-constrained embedded designs.
Technical Context
The MAX3100EEE+ implements a full UART core with independent transmit/receive shift registers, 16× oversampling receiver logic with majority-sampled start-bit detection, and a programmable baud-rate generator driven by internal crystal oscillator (1.8432MHz or 3.6864MHz). Its SPI interface uses DIN/DOUT/SCLK/CS with strict timing (tCL ≥100ns, tCH ≥100ns) and supports four maskable interrupt sources: receive-data-ready (R), transmit-buffer-empty (T), parity-error (PM), and receive-activity-in-shutdown (RAM).
It features dual shutdown modes: hardware (SHDN pin low, immediate oscillator stop) and software (SHDNi bit = 1, exits after current transmission), both reducing ICC to ≤10µA while retaining RX activity detection. The device supports 7-/8-/9-bit word lengths, configurable stop bits (1 or 2), and IrDA-compliant 3/16-width pulse timing for low-power IR links.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Baud Rate Range | 300 bps to 230.4 kbps - supports standard serial protocols including RS-232, RS-485, and IrDA SIR via software-selectable divisor (B0–B3) and crystal frequency. |
| FIFO Depth | 8-word deep receive FIFO - reduces CPU polling overhead during high-speed data bursts without requiring external buffering. |
| Supply Voltage | +2.7V to +5.5V - enables direct interfacing with 3.3V and 5V microcontrollers without level-shifting. |
| Shutdown Current | 10µA max at -40°C to +85°C - allows battery-powered devices to maintain wake-on-RX capability with minimal quiescent drain. |
| TX/RTS Output Sink | 25mA per pin - directly drives opto-coupler LEDs (e.g., 6N136) without external transistors in isolated interfaces. |
| Input Thresholds | Schmitt-trigger inputs on DIN, SCLK, CS, SHDN, CTS, RX - ensures noise immunity in electrically noisy industrial environments. |
| Operating Temperature | -40°C to +85°C - qualified for extended-temperature industrial and building automation applications. |
Pinout & Package
MAX3100EEE+ is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 1.0mm height) with lead-free/RoHS-compliant finish. Pin 1 is marked with a dot; pin numbering follows standard counter-clockwise orientation from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIN (Pin 1) | SPI Serial Data Input | Schmitt-triggered input accepting 16-bit configuration/data words; latched on SCLK rising edge. |
| DOUT (Pin 2) | SPI Serial Data Output | Open-drain compatible output; tri-stated when CS is high to allow bus sharing. |
| SCLK (Pin 3) | SPI Clock Input | Schmitt-triggered clock input; defines timing for DIN sampling and DOUT transitions (min 100ns high/low). |
| CS (Pin 4) | Active-Low Chip Select | Initiates SPI transaction; rising edge commits register writes and clears internal status flags. |
| GND (Pin 8) | Ground Reference | Primary analog/digital return path; must be low-impedance for stable oscillator and UART operation. |
| X1 (Pin 10) | Clock Input / Crystal Terminal | Accepts 1.8432MHz or 3.6864MHz parallel-resonant crystal or external square-wave clock (45–55% duty cycle). |
| X2 (Pin 9) | Clock Output / Crystal Terminal | Connected internally to crystal; left unconnected when using external clock source at X1. |
| CTS (Pin 11) | Clear-to-Send Input | General-purpose active-low input; readable via register bit to implement hardware flow control. |
| RTS (Pin 13) | Request-to-Send Output | Active-low output controlled by register bit; used for RS-232 handshaking or RS-485 driver enable. |
| RX (Pin 14) | Asynchronous Receive Input | High-impedance input with Schmitt trigger; detects start-bit transitions even in shutdown mode. |
| TX (Pin 15) | Asynchronous Transmit Output | CMOS-level output sinking 25mA; directly drives opto-coupler LEDs or RS-232 line drivers. |
| VCC (Pin 16) | Positive Supply | Single supply rail supporting 2.7V–5.5V operation; powers all internal logic, oscillator, and I/O buffers. |
| SHDN (Pin 7) | Hardware Shutdown Control | Asynchronous active-low input forcing immediate oscillator disable and <10µA ICC regardless of SPI state. |
| IRQ (Pin 6) | Interrupt Request Output | Open-drain active-low interrupt signaling R, T, PM, or RAM events; requires external pull-up resistor. |
Key Features
| Feature | Design Value |
|---|---|
| IrDA SIR Timing Mode | Enables 3/16-bit-width pulse generation for infrared data links, reducing average power by >81% vs. standard UART timing. |
| Receive Activity Detection in Shutdown | Generates IRQ on RX transition while consuming only 10µA - enables wake-on-serial for ultra-low-power monitoring. |
| 9-Bit Address Recognition | Supports multi-drop networks via configurable 9-bit mode with address-match interrupt (RA/FE bit used as activity flag in shutdown). |
| Flexible Interrupt Masking | Four independent mask bits (RM, TM, PM, RAM) allow selective IRQ assertion - eliminates spurious interrupts in resource-constrained µC systems. |
| Opto-Coupler Direct Drive | TX and RTS outputs sink 25mA at VCC = 3.3V - eliminates external driver transistors in isolated RS-232/RS-485 interfaces. |
Applications
| Handheld Instruments | Intelligent Building Control |
|---|---|
Use Scenario: Battery-powered multimeters and portable data loggers require low-quiescent UARTs to extend runtime between charges. IC Role / Device Role / Timing Role: MAX3100EEE+ serves as SPI-to-asynchronous bridge, handling RS-232/USB-UART conversion while maintaining <10µA shutdown current. Use Value: Enables 3+ year battery life in always-on monitoring mode via RX-wake capability and IrDA low-duty-cycle operation. |
Use Scenario: HVAC controllers use isolated UARTs to communicate with remote sensors across long cable runs in electrically noisy environments. IC Role / Device Role / Timing Role: MAX3100EEE+ provides galvanically isolated RS-485 interface via direct opto-coupler drive (TX/RTS → 6N136). Use Value: Eliminates external transistor drivers and reduces BOM count by 2 components per channel while meeting IEC 61000-4-5 surge immunity. |
| Low-Cost IR Data Links | Small Industrial Networks |
Use Scenario: Peripheral devices like barcode scanners and POS terminals need reliable short-range wireless serial links without Bluetooth complexity. IC Role / Device Role / Timing Role: MAX3100EEE+ implements IrDA SIR physical layer with precise 3/16-bit pulse timing and automatic baud rate adaptation. Use Value: Achieves 115.2kbps IR link with <5% timing error using 1.8432MHz crystal - compliant with IrDA 1.0 specification. |
Use Scenario: Distributed PLC I/O modules require robust UARTs supporting multi-drop addressing and noise-immune communication over twisted-pair wiring. IC Role / Device Role / Timing Role: MAX3100EEE+ operates as 9-bit network node with address recognition interrupt and Schmitt-trigger RX input. Use Value: Reduces firmware overhead by 40% via 8-word FIFO and maskable interrupts - enabling deterministic response under 10ms latency budget. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UART interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3107EEE+ | Higher integration: includes integrated RS-232 transceiver (±15kV ESD), 32-word FIFO, and auto-flow control - but consumes 2.5× more active current (375µA vs. 150µA). | Best suited for space-constrained designs needing direct RS-232 line driving without external transceivers. | Select MAX3107EEE+ only if RS-232 physical layer integration justifies higher cost and power; MAX3100EEE+ remains optimal for opto-isolated or custom PHY interfaces. |
| SC16IS752IPW | I²C/SPI dual-interface, 64-byte FIFO, hardware flow control (RTS/CTS), and fractional baud-rate generator - but lacks IrDA timing mode and shutdown current >100µA. | Preferred for systems requiring I²C compatibility or higher throughput with larger FIFO, but not for ultra-low-power wake-on-RX. | Choose SC16IS752IPW when I²C bus sharing or larger buffer depth is critical; MAX3100EEE+ is superior for sub-10µA shutdown and IR applications. |
Compared with MAX3107EEE+, MAX3100EEE+ offers 83% lower shutdown current and dedicated IrDA timing, while SC16IS752IPW provides I²C flexibility and larger FIFO at the expense of power efficiency and IR support - making MAX3100EEE+ the optimal choice for battery-powered, IR-capable, or opto-isolated UART expansion.
Availability
MAX3100EEE+ is available at Aetrix Electronics and suitable for handheld instrumentation, intelligent building control systems, and low-power IR data links requiring stable component supply across industrial temperature ranges.
Supply support for MAX3100EEE+ 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 precision analog, mixed-signal, and high-reliability ICs for industrial, medical, and communications applications.
The MAX3100 series was designed specifically to extend microcontroller UART capability via SPI with minimal footprint and ultra-low power - targeting space- and energy-constrained embedded systems where traditional UARTs lack interface flexibility.
FAQ
What is the maximum baud rate supported by the MAX3100EEE+?
The MAX3100EEE+ supports up to 230.4 kbps when operated with a 3.6864MHz crystal and appropriate baud-rate divisor (B0–B3 = 0000). This is confirmed in Table 7 of the official datasheet and validated across the full -40°C to +85°C temperature range. At 115.2 kbps, typical supply current is 150µA at 3.3V, making it suitable for high-speed yet power-sensitive applications.
Does the MAX3100EEE+ require external components to operate with a crystal?
Yes, the MAX3100EEE+ requires two external load capacitors (typically 12pF–22pF each) connected between X1 and X2 to ground when using a parallel-resonant crystal. Ceramic resonators with built-in capacitors are also supported. No external resistors or feedback components are needed - the oscillator circuit is fully integrated, and the datasheet specifies exact capacitor values based on crystal manufacturer recommendations.
Can the MAX3100EEE+ drive RS-232 line drivers directly?
No, the MAX3100EEE+ outputs CMOS-level signals (VOL ≤0.4V, VOH ≥VCC–0.5V) and cannot directly meet RS-232 voltage requirements (±3V to ±15V). However, it can directly drive opto-couplers (e.g., 6N136) or RS-232 transceivers like MAX232/MAX3232 via its 25mA-sink TX and RTS pins - eliminating external transistor drivers in isolated implementations.
How does the MAX3100EEE+ handle framing errors during reception?
The MAX3100EEE+ sets the FE (framing error) bit in the RA/FE register when a zero is received where the first stop bit is expected. FE is cleared automatically upon receipt of the next properly framed character, independent of FIFO state. In shutdown mode, the same bit becomes RA (receive activity) and is set on any RX transition - enabling wake-on-serial without false triggers from framing noise.
Is the MAX3100EEE+ pin-compatible with other packages in the MAX3100 family?
No, the MAX3100EEE+ uses a 16-pin QSOP package, while the MAX3100CPD+ and MAX3100EPD+ use 14-pin DIP, and MAX3100ETG+ uses 24-pin TQFN-EP. Pin functions differ significantly across packages - e.g., DIP lacks DOUT pin (replaced by NC), and TQFN has different pin 1 location and exposed pad grounding requirement. Board layout must be redesigned for each package variant.
MAX3100EEE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Programmable:
- Not Verified
- Protocol:
- RS232, RS485
- Function:
- Controller
- Interface:
- SPI, UART
- Standards:
- -
- Voltage - Supply:
- 2.7V ~ 5.5V
- Current - Supply:
- 150µA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-QSOP
- Grade:
- -
- Qualification:
- -
MAX3100EEE+ FAQ
1.How can I place an order for MAX3100EEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX3100EEE+ 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 MAX3100EEE+ reliable?
The price and inventory of MAX3100EEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX3100EEE+ is usually 5 days.
3.What payment methods are accepted for MAX3100EEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX3100EEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX3100EEE+?
MAX3100EEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX3100EEE+ 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 MAX3100EEE+?
For technical support, including MAX3100EEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX3100EEE+ requirements.
6.How does Aetrix verify that MAX3100EEE+ is sourced from the original manufacturer or authorized distributors?
All MAX3100EEE+ 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 MAX3100EEE+ meets industry standards.
7.What is the process for return or replacement of MAX3100EEE+?
All MAX3100EEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX3100EEE+, 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 MAX3100EEE+ part is unused and in its original packaging.
Return procedure for MAX3100EEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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