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Analog Devices Inc./Maxim Integrated MAX3100EPD+
- Part No.:
- MAX3100EPD+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Controllers
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX3100EPD+.pdf
- Description:
- IC UART SPI MICROWIRE-COMP 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,282
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Product details
Overview
MAX3100EPD+ 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, software-programmable baud-rate generator (300–230 kbps), IrDA SIR timing mode, and shutdown current of 10 µA. Used in isolated RS-232/RS-485 links, low-cost IR data links, and HVAC/building control networks.
For engineers reviewing the MAX3100EPD+ datasheet, MAX3100EPD+ pinout, MAX3100EPD+ application, or MAX3100EPD+ equivalent, this page delivers verified technical context, real-world interface constraints, confirmed power behavior across temperature, and validated alternative options for UART expansion in space- and power-constrained embedded designs.
Technical Context
The MAX3100EPD+ implements a full UART core with synchronous SPI/MICROWIRE host interface, 16× oversampling receiver with majority-sampled start-bit detection, and hardware/software shutdown control that halts the oscillator while preserving interrupt-on-RX capability. Its baud-rate generator uses B0–B3 bits to select 16 division ratios, supporting precise rates up to 230 kbps with 1.8432 MHz or 3.6864 MHz crystals.
It features an open-drain IRQ output with four maskable sources (RX data ready, TX buffer empty, parity error, receive activity in shutdown), Schmitt-trigger inputs for opto-coupler compatibility, and TX/RTS outputs capable of sinking 25 mA-enabling 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 legacy modems through high-speed industrial serial links |
| FIFO Depth | 8-word deep - reduces MCU polling overhead and prevents data loss at burst rates ≥115.2 kbps |
| Supply Voltage | +2.7V to +5.5V - operates across single 3.3V or 5V rails, compatible with mixed-voltage system designs |
| Shutdown Current | 10 µA at -40°C to +85°C - enables battery-backed wake-on-RX functionality in portable instrumentation |
| TX/RTS Sink Current | 25 mA - directly drives standard opto-couplers (e.g., 6N136) without external transistors |
| IrDA SIR Mode | Enabled via IR bit - configures 3/16-bit pulse width for infrared data association compliance |
| Operating Temp | -40°C to +85°C - qualified for extended industrial environments including building automation and field instruments |
Pinout & Package
MAX3100EPD+ is housed in a 14-pin plastic DIP package rated for -40°C to +85°C operation. The DIP footprint provides robust through-hole mounting suitable for prototyping, test fixtures, and industrial control panels requiring mechanical stability and thermal margin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VCC) | Positive supply input | Accepts +2.7V to +5.5V; bypass capacitor required near pin for noise immunity |
| 2 (TX) | Asynchronous transmit output | CMOS-level output; sinks 25 mA for direct opto-coupler drive |
| 3 (RX) | Asynchronous receive input | Schmitt-trigger input; detects RX transitions even in shutdown to wake MCU |
| 4 (RTS) | Request-to-send control output | Active-low general-purpose output; software-controllable for RS-485 enable |
| 5 (N.C.) | No connection | Not internally bonded; must remain unconnected per datasheet |
| 6 (CTS) | Clear-to-send input | Active-low handshaking input; readable via register for flow control |
| 7 (X1) | Clock input / crystal terminal | Accepts 1.8432 MHz or 3.6864 MHz crystal or external square-wave clock |
| 8 (X2) | Crytal terminal | Connected to crystal second lead; left floating for external clock mode |
| 9 (DIN) | SPI data input | Schmitt-triggered; latched on SCLK rising edge for noise-immune configuration |
| 10 (DOUT) | SPI data output | High-impedance when CS high; valid after SCLK falling edge |
| 11 (SCLK) | SPI clock input | Schmitt-triggered; defines timing for all register reads/writes |
| 12 (CS) | Chip-select input | Active-low; initiates 16-bit SPI frame; aborts transfer if deasserted mid-cycle |
| 13 (IRQ) | Interrupt output | Open-drain; asserts low on configurable events (RX data, TX empty, framing error, RX activity) |
| 14 (SHDN) | Hardware shutdown input | Logic-low forces immediate oscillator stop and 10 µA quiescent state |
| GND | Ground reference | Common return for VCC, I/O, and crystal circuit; critical for EMI suppression |
Key Features
| Feature | Design Value |
|---|---|
| IrDA SIR timing mode | Configurable via IR bit; enables 3/16-bit pulse width for infrared data association compliance without external timing components |
| 8-word FIFO buffer | Reduces processor interrupt frequency by >75% at 115.2 kbps, minimizing firmware latency in real-time sensor networks |
| 25 mA TX/RTS sink capability | Eliminates need for external driver transistors when interfacing with common opto-couplers (e.g., 6N136, PC817) |
| Receive-activity interrupt in shutdown | Allows ultra-low-power monitoring of serial bus activity; wakes host MCU only on valid RX transitions |
| Software- and hardware-initiated shutdown | SHDN pin provides immediate power-down; SHDNi bit enables graceful shutdown after transmission completes |
Applications
| Handheld Instruments | Intelligent Instrumentation |
|---|---|
Use Scenario: Portable multimeters and handheld oscilloscopes require low-power, compact UARTs to relay measurement data to Bluetooth or USB adapters. IC Role / Device Role / Timing Role: MAX3100EPD+ serves as the serial bridge between MCU and wireless module, using SPI for minimal pin count and IrDA mode for optional IR diagnostics. Use Value: 10 µA shutdown current extends battery life; 14-pin DIP simplifies manual assembly and field repairability. |
Use Scenario: Programmable logic controllers (PLCs) and environmental sensors use isolated UARTs to communicate over noisy factory-floor RS-485 buses. IC Role / Device Role / Timing Role: MAX3100EPD+ interfaces the controller MCU to opto-isolated RS-485 transceivers, with RTS controlling driver direction and Schmitt-trigger inputs rejecting EMI. Use Value: 25 mA TX/RTS sink drives opto-couplers directly; -40°C to +85°C rating ensures reliability in uncontrolled enclosures. |
| UART in SPI Systems | Low-Cost IR Data Links |
Use Scenario: Resource-constrained microcontrollers (e.g., 8-bit PIC or ARM Cortex-M0) lack native UART peripherals but require serial debug or sensor telemetry. IC Role / Device Role / Timing Role: MAX3100EPD+ acts as a SPI-to-asynchronous bridge, offloading UART protocol handling and timing from firmware. Use Value: 16-bit SPI interface eliminates bit-banging; programmable baud dividers support custom rates without crystal changes. |
Use Scenario: Consumer electronics like remote controls and medical devices use IrDA for short-range, low-power, license-free wireless communication. IC Role / Device Role / Timing Role: MAX3100EPD+ generates precise 3/16-bit pulses in IrDA SIR mode, synchronizing with host MCU's SPI clock for deterministic timing. Use Value: Eliminates dedicated IrDA PHY IC; integrated oscillator removes external timing components, reducing BOM cost by ≥30%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UART interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3100CEE+ | Same silicon, 16-pin QSOP package; higher pin density but requires rework for DIP-based layouts | Preferred for space-constrained PCBs; not drop-in compatible with MAX3100EPD+ due to different footprint and thermal profile | Select MAX3100CEE+ only when board redesign accommodates QSOP and thermal management is verified. |
| SC16IS750IPW | I²C interface instead of SPI; includes 64-byte FIFO, fractional baud generator, and GPIOs; operates at 2.5–3.6V only | Better suited for I²C-based SoCs and applications needing larger buffer or multi-drop bus support | Choose SC16IS750IPW when I²C is available and deeper FIFO or voltage compatibility with 3.3V-only systems is required. |
Compared with MAX3100CEE+, the MAX3100EPD+ offers proven DIP-mount reliability and simpler layout for prototyping; versus SC16IS750IPW, it delivers lower quiescent current (10 µA vs. 25 µA), broader supply range (+2.7V–+5.5V), and direct opto-driver capability-making it optimal for industrial isolation and battery-powered instrumentation.
Availability
MAX3100EPD+ is available at Aetrix Electronics and suitable for handheld instruments, intelligent instrumentation, and isolated RS-232/RS-485 interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX3100EPD+ 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 interface solutions for industrial, medical, and communications markets.
The MAX3100 product line was designed to extend microcontroller capabilities with low-power, SPI-connected UARTs-targeting space-constrained, battery-operated, and electrically noisy embedded systems where isolation and flexibility are critical.
FAQ
What is the operating temperature range for MAX3100EPD+?
The MAX3100EPD+ is specified for -40°C to +85°C operation, making it suitable for industrial environments such as building automation controllers, field-deployed instrumentation, and HVAC systems where ambient temperatures exceed commercial-grade limits. This range is confirmed in the Ordering Information table and validated across electrical characteristics including supply current and output drive strength.
Does MAX3100EPD+ support IrDA communication?
Yes, MAX3100EPD+ supports IrDA SIR (Serial Infrared) communication via its configurable IrDA timing mode, enabled by setting the IR bit in the write-configuration register. This mode produces 3/16-bit pulse widths compliant with IrDA 1.0 physical layer requirements, enabling low-cost infrared data links without external timing circuitry.
Can MAX3100EPD+ drive opto-couplers directly?
Yes, MAX3100EPD+ can drive opto-couplers directly: its TX and RTS outputs each sink up to 25 mA at VCC = 3.3V or 5V, matching the forward current requirements of common devices like the 6N136 and PC817. This eliminates external transistor drivers and reduces BOM count in isolated RS-232/RS-485 designs.
What is the minimum supply voltage for MAX3100EPD+?
The minimum supply voltage for MAX3100EPD+ is +2.7V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Operation below this voltage risks functional failure or undefined register behavior; design margins should maintain VCC ≥2.75V across load and temperature extremes.
How does shutdown mode work on MAX3100EPD+?
MAX3100EPD+ supports two shutdown methods: hardware (SHDN pin pulled low) terminates transmission immediately and cuts supply current to ≤10 µA; software (SHDNi bit = 1) waits for current TX to complete before stopping the oscillator. Both modes retain IRQ capability to detect RX transitions and wake the host system.
MAX3100EPD+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- 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:
- 14-PDIP
- Grade:
- -
- Qualification:
- -
MAX3100EPD+ FAQ
1.How can I place an order for MAX3100EPD+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX3100EPD+ 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 MAX3100EPD+ reliable?
The price and inventory of MAX3100EPD+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX3100EPD+ is usually 5 days.
3.What payment methods are accepted for MAX3100EPD+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX3100EPD+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX3100EPD+?
MAX3100EPD+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX3100EPD+ 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 MAX3100EPD+?
For technical support, including MAX3100EPD+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX3100EPD+ requirements.
6.How does Aetrix verify that MAX3100EPD+ is sourced from the original manufacturer or authorized distributors?
All MAX3100EPD+ 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 MAX3100EPD+ meets industry standards.
7.What is the process for return or replacement of MAX3100EPD+?
All MAX3100EPD+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX3100EPD+, 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 MAX3100EPD+ part is unused and in its original packaging.
Return procedure for MAX3100EPD+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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