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Analog Devices Inc./Maxim Integrated MAX3100EEE+T
- Part No.:
- MAX3100EEE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX3100EEE+T.pdf
- Description:
- IC UART SPI COMPAT 16-QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,097
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Product details
Overview
MAX3100EEE+T from Maxim Integrated is a SPI/MICROWIRE-compatible universal asynchronous receiver-transmitter (UART) optimized for microcontroller-based systems. It integrates a crystal oscillator, 8-word FIFO, IrDA timing mode, and hardware/software shutdown - supporting RS-232/RS-485/IR/opto-isolated links at baud rates up to 230 kbps with 3.6864 MHz crystal. Used in handheld instruments and isolated HVAC networks.
For engineers reviewing the MAX3100EEE+T datasheet, MAX3100EEE+T pinout, MAX3100EEE+T application, or MAX3100EEE+T equivalent, this page delivers verified technical context, real-world interface constraints, confirmed low-power behavior in shutdown, and precise UART register-level functionality - all validated against Maxim's official documentation and package-specific electrical characteristics.
Technical Context
The MAX3100EEE+T implements a full-duplex UART with synchronous SPI/MICROWIRE host interface, using internal 16× baud-rate sampling and majority-voting start-bit detection. Its baud generator uses B0–B3 bits to select 16 division ratios, enabling standard rates from 300 to 230 kbps with 1.8432 MHz or 3.6864 MHz crystals.
It features dual interrupt sources (RX activity in shutdown, framing error in active mode), configurable 7-/8-/9-bit word length with software-controlled parity, and Schmitt-trigger inputs rated for direct opto-coupler interfacing. TX/RTS outputs sink 25 mA, supporting direct drive of opto-isolators without external buffers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Baud Rate Range | 300 bps to 230 kbps - supports full legacy and high-speed serial protocols via programmable divider (B0–B3) and 1.8432/3.6864 MHz crystal. |
| FIFO Depth | 8-word receive FIFO - reduces MCU polling overhead and prevents data loss during burst transfers at high baud rates. |
| Supply Voltage | +2.7 V to +5.5 V - enables direct integration into 3.3 V or 5 V embedded systems without level-shifting. |
| Shutdown Current | 10 µA - allows battery-powered devices to maintain RX wake-on-activity detection while minimizing quiescent draw. |
| TX/RTS Sink Current | 25 mA - sufficient to directly drive LED anodes of common opto-couplers (e.g., 6N136) without external transistors. |
| IrDA SIR Timing | Enabled via IR bit - configures 3/16-bit pulse width for infrared data association compliance, reducing power in IR links. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and extended-environment applications including building control and instrumentation. |
Pinout & Package
MAX3100EEE+T is housed in a 16-pin QSOP (Quad Small Outline Package) with 0.65 mm lead pitch and exposed thermal pad (not connected in QSOP variant). Pin functions are electrically identical across DIP/QSOP/TQFN packages per Maxim's pin description table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIN (Pin 1) | SPI Data Input | Schmitt-triggered serial command/data input; latched on SCLK rising edge - tolerant of slow/noisy microcontroller signals. |
| DOUT (Pin 2) | SPI Data Output | Open-drain-capable output; tri-states when CS is high - enables shared SPI bus operation without contention. |
| SCLK (Pin 3) | SPI Clock Input | Schmitt-triggered clock input; defines timing for DIN/DOUT transfers - supports up to 2.5 MHz SCLK per AC specs. |
| CS (Pin 4) | Chip Select | Active-low enable; initiates 16-bit frame transfer and controls DOUT tri-state - critical for multi-device SPI arbitration. |
| IRQ (Pin 6) | Interrupt Output | Open-drain active-low interrupt; asserts on R/TM, RM, PM, or RAM conditions - requires external pull-up for MCU GPIO interface. |
| SHDN (Pin 7) | Hardware Shutdown | Asynchronous logic-low entry into 10 µA shutdown - terminates ongoing transmission immediately, unlike software SHDNi. |
| GND (Pin 8) | Ground Reference | Primary analog/digital ground return - must be low-impedance connection to minimize noise coupling into RX/TX paths. |
| X2 (Pin 9) | Crytal Oscillator | Crystal load terminal; left unconnected for external clock drive at X1 - used with parallel-resonant 1.8432/3.6864 MHz crystals. |
| X1 (Pin 10) | Crytal/Clock Input | Crystal drive or external clock input (45–55% duty cycle); internal oscillator starts within ~25 ms after exit from shutdown. |
| CTS (Pin 11) | Clear-to-Send Input | General-purpose active-low input; readable via CTS register bit - commonly used for RS-232 flow control handshake. |
| RTS (Pin 13) | Request-to-Send Output | Active-low general-purpose output; controlled by RTS register bit - often drives RS-485 DE/RE pins or opto-isolator LEDs. |
| RX (Pin 14) | Asynchronous Receive | High-impedance TTL-level input; detects start bit via 16× oversampling and majority voting - immune to short glitches. |
| TX (Pin 15) | Asynchronous Transmit | Push-pull output; drives RS-232 line drivers or opto-coupler LEDs directly - supports 25 mA sink at VCC = 3.3 V. |
| VCC (Pin 16) | Power Supply | +2.7 V to +5.5 V supply; powers all digital and analog blocks - decoupling capacitor (0.1 µF) required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| IrDA SIR Timing Mode | Configurable via IR bit; generates 3/16-bit pulse width for infrared data association - cuts average current >80% vs. standard UART in IR links. |
| 8-Word Receive FIFO | Reduces MCU interrupt frequency and processing load during sustained high-speed serial reception - prevents overrun at 115.2 kbps with typical ISR latency. |
| Receive Activity Interrupt in Shutdown | RA bit triggers IRQ on RX transition while ICC = 10 µA - enables always-on wake-on-RX capability for battery-backed remote sensors. |
| Schmitt-Trigger Inputs | Applied to DIN, SCLK, CS, CTS, RX, and SHDN - ensures reliable logic-level recognition with slow-rising or noisy signals from opto-couplers. |
| Software/Hardware Shutdown Control | SHDNi bit (software) delays shutdown until TX completes; SHDN pin (hardware) forces immediate shutdown - provides flexible power management options. |
| 9-Bit Address Recognition | Supports multi-drop networks via 9-bit mode (L=0, PE=1); RA/FE bit doubles as address-match flag in shutdown - simplifies addressing in HVAC control buses. |
Applications
| Handheld Instruments | Intelligent Instrumentation |
|---|---|
Use Scenario: Portable multimeters and data loggers require compact, low-power serial interfaces to communicate measurement data to host PCs or wireless modules. IC Role / Device Role / Timing Role: MAX3100EEE+T serves as the primary UART bridge between ARM Cortex-M0 MCU and isolated RS-232/USB-UART adapter, handling protocol translation and flow control. Use Value: 10 µA shutdown current extends battery life; 8-word FIFO prevents data loss during MCU sleep/wake transitions; QSOP-16 footprint saves PCB area. |
Use Scenario: Programmable logic controllers (PLCs) and sensor nodes in factory automation use isolated serial links for configuration and diagnostics. IC Role / Device Role / Timing Role: MAX3100EEE+T interfaces microcontroller SPI to opto-isolated RS-485 transceivers, managing transmit enable (RTS), receive activity, and error reporting. Use Value: 25 mA TX/RTS sink drives 6N136 opto-couplers directly; −40°C to +85°C rating ensures reliability in industrial enclosures; IrDA mode reduces power in IR-configured field tools. |
| UART in SPI Systems | Isolated RS-232/RS-485 |
Use Scenario: Resource-constrained microcontrollers (e.g., PIC16, MSP430) lack native UART peripherals but require serial communication for firmware updates or debugging. IC Role / Device Role / Timing Role: MAX3100EEE+T acts as a SPI-to-UART co-processor, offloading serial framing, baud generation, and FIFO management from the host MCU. Use Value: SPI interface eliminates need for dedicated UART pins; software-programmable baud rates simplify support for multiple host protocols; small QSOP-16 eases layout in space-limited designs. |
Use Scenario: Medical devices and test equipment require galvanic isolation between patient-connected or high-voltage sections and control logic. IC Role / Device Role / Timing Role: MAX3100EEE+T drives opto-coupler inputs for bidirectional RS-232/RS-485 isolation, with Schmitt-trigger inputs tolerating opto-output rise/fall asymmetry. Use Value: Direct opto-drive capability removes discrete transistors; shutdown-mode RX wake-up enables low-power monitoring; 1.8432 MHz crystal minimizes EMI in sensitive analog environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UART interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SC16IS752IPW | Two-channel I²C/SPI UART with 64-byte FIFO, 2 kB internal RAM, and GPIOs; operates from 2.5–3.6 V only. | Higher integration for multi-port systems; lacks IrDA mode and hardware shutdown; requires level-shifting for 5 V hosts. | Choose SC16IS752IPW when dual UARTs, larger FIFO, or GPIO expansion are needed - not for single-channel, ultra-low-power, or 5 V-native designs. |
| TL16C752BPTR | Single-chip dual UART with 64-byte FIFO per channel, parallel CPU interface, and 3.3/5 V support; no integrated oscillator or SPI interface. | Designed for x86/ASIC host buses; requires external crystal and level translators; higher pin count (48-TQFP) and power draw. | Choose TL16C752BPTR for legacy parallel-bus systems needing dual UARTs - not for SPI-based microcontrollers or space/power-constrained applications. |
Compared with SC16IS752IPW and TL16C752BPTR, the MAX3100EEE+T offers unique advantages in minimal-footprint SPI UARTs with sub-10 µA shutdown, integrated oscillator, and opto-driver-ready outputs - making it optimal for cost-sensitive, battery-operated, or isolated single-port implementations.
Availability
MAX3100EEE+T is available at Aetrix Electronics and suitable for handheld instruments, intelligent instrumentation, and isolated RS-232/RS-485 interfaces requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX3100EEE+T 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 MAX3100EEE+T belongs to Maxim's interface and communication product line, designed specifically to simplify serial connectivity in resource-constrained microcontroller systems with emphasis on low power, small size, and robust isolation support.
FAQ
What is the maximum baud rate supported by the MAX3100EEE+T?
The MAX3100EEE+T supports up to 230.4 kbps when using a 3.6864 MHz crystal and appropriate B0–B3 divisor settings. This is confirmed in Table 7 of the official datasheet, where "230.4k" is explicitly listed as the highest achievable rate. The device achieves this using a 16× oversampled baud clock derived from the crystal oscillator, ensuring timing accuracy within ±1% for reliable inter-system communication.
Does the MAX3100EEE+T require an external crystal, or can it use an external clock source?
The MAX3100EEE+T supports both configurations: it can drive a parallel-resonant crystal (1.8432 MHz or 3.6864 MHz) between X1 and X2, or accept an external square-wave clock (45–55% duty cycle) applied to X1 while leaving X2 unconnected. This flexibility is documented in the "Crystal-Oscillator Operation" section and allows designers to choose based on cost, accuracy, and board space requirements - all while maintaining full MAX3100EEE+T functionality.
How does the MAX3100EEE+T handle wake-up from shutdown mode?
The MAX3100EEE+T wakes from shutdown via RX activity: any high-to-low or low-to-high transition on the RX pin sets the RA bit and asserts IRQ, even while drawing only 10 µA. This wake-on-RX behavior is hardware-verified and independent of software state - allowing the host MCU to remain in deep sleep until serial traffic arrives. The MAX3100EEE+T exits shutdown fully functional within ~25 ms after oscillator restart.
Can the MAX3100EEE+T directly drive opto-couplers without external transistors?
Yes - the MAX3100EEE+T TX and RTS outputs each sink up to 25 mA at VCC = 3.3 V, as specified in the Electrical Characteristics table. This is sufficient to directly drive the LED anode of common opto-couplers like the 6N136 (IF = 10–15 mA typical). Combined with Schmitt-trigger inputs tolerant of opto-output rise/fall times, the MAX3100EEE+T eliminates discrete buffer components in isolated serial designs.
What is the function of the DOUT pin during SPI communication with the MAX3100EEE+T?
The DOUT pin of the MAX3100EEE+T outputs 16-bit response data (e.g., read configuration or received UART data) synchronized to SCLK falling edges. It enters high-impedance state when CS is high - enabling shared SPI bus operation. This behavior is defined in the Pin Description and Figure 1 timing diagram, ensuring predictable bus arbitration and eliminating contention with other SPI slaves on the same bus.
MAX3100EEE+T 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+T FAQ
1.How can I place an order for MAX3100EEE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX3100EEE+T 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+T reliable?
The price and inventory of MAX3100EEE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX3100EEE+T is usually 5 days.
3.What payment methods are accepted for MAX3100EEE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX3100EEE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX3100EEE+T?
MAX3100EEE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX3100EEE+T 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+T?
For technical support, including MAX3100EEE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX3100EEE+T requirements.
6.How does Aetrix verify that MAX3100EEE+T is sourced from the original manufacturer or authorized distributors?
All MAX3100EEE+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX3100EEE+T?
All MAX3100EEE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX3100EEE+T, 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+T part is unused and in its original packaging.
Return procedure for MAX3100EEE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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