Analog Devices Inc./Maxim Integrated MAX3110EEWI

Overview

MAX3110EEWI from Maxim Integrated is a SPI/MICROWIRE-compatible UART with integrated ±15kV ESD-protected RS-232 transceiver, 2-driver/2-receiver interface, internal charge-pump capacitors, and crystal oscillator - all in a single 28-pin wide SO package. It operates from +4.5V to +5.5V, delivers true RS-232 output levels down to VCC = +4.5V, supports up to 230kbps data rate, and consumes only 600µA in active mode. It is used in space-constrained industrial front-panel interfaces requiring low-power serial communication.

For engineers reviewing the MAX3110EEWI datasheet, MAX3110EEWI pinout, MAX3110EEWI application, or MAX3110EEWI equivalent, key selection considerations include its dual-function integration (UART + RS-232), hardware/software shutdown capability (10µA), 8-word receive FIFO, SPI timing compatibility (CPOL=0, CPHA=0), and guaranteed operation across –40°C to +85°C.

Technical Context

The MAX3110EEWI integrates a full-duplex SPI/QSPI/MICROWIRE UART (16-bit frame, CPOL=0/CPHA=0) with an independent 2×RS-232 transceiver sharing only VCC and GND. Its UART includes a programmable baud-rate generator (300–230kbaud), 8-deep FIFO, and four-maskable interrupt sources (R, RA/FE, Pr, IRQ).

The RS-232 section uses proprietary low-dropout drivers enabling ±5.4V outputs at VCC = +4.5V, with ESD protection per IEC 1000-4-2 (±15kV air/contact). Hardware shutdown disables charge pumps while keeping receivers active; software shutdown halts the oscillator and clears FIFO/register states.

Key Specifications

Pinout & Package

MAX3110EEWI is housed in a 28-pin Wide SO (SOIC-W) package, 11.5mm × 7.6mm body, 1.27mm pitch, RoHS-compliant, with exposed pad option not specified.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar UART + RS-232 transceiver applications.

Compared with MAX3222ECAE+ and SP3223ECA-L, the MAX3110EEWI uniquely combines UART logic, RS-232 transceivers, crystal oscillator, and FIFO in one package - eliminating external timing components, reducing µC I/O usage, and enabling faster time-to-market for compact embedded serial gateways.

Availability

MAX3110EEWI is available at Aetrix Electronics and suitable for industrial front-panel interfaces, handheld test equipment, telecom diagnostic ports, and point-of-sale terminals requiring stable component supply across extended temperature ranges.

Supply support for MAX3110EEWI 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 computing markets.

The MAX3110E series was designed to replace multi-chip UART + RS-232 solutions in space- and power-constrained embedded systems - targeting portable instrumentation, ruggedized HMI, and field-service equipment.

FAQ

What is the operating temperature range for MAX3110EEWI?

The MAX3110EEWI is rated for –40°C to +85°C ambient operation, as indicated by the "EE" suffix in the part number. This extended temperature grade ensures reliable UART and RS-232 functionality in industrial enclosures, outdoor kiosks, and automotive under-hood diagnostic tools where thermal cycling exceeds commercial-grade limits. The MAX3110EEWI maintains full 230kbps performance and ±15kV ESD protection across this entire range.

Does MAX3110EEWI require external capacitors for RS-232 voltage generation?

No, the MAX3110EEWI does not require external capacitors for RS-232 voltage generation. It integrates internal charge-pump capacitors (C1+, C1-, C2+, C2-) and generates ±5.4V RS-232 compliant outputs directly from a single +4.5V to +5.5V supply. This eliminates four 1µF external ceramic capacitors, reduces layout complexity, and improves long-term reliability by removing capacitor aging and microphonics concerns associated with discrete charge-pump networks.

How does the hardware shutdown mode affect UART functionality in MAX3110EEWI?

In hardware shutdown mode (SHDN = GND), the MAX3110EEWI disables the RS-232 charge pumps and transmitters while keeping the UART core, crystal oscillator, and receivers fully operational. This allows external RS-232 devices to assert R_IN signals and trigger IRQ interrupts at just 10µA total supply current - enabling wake-on-ring or remote command detection without waking the host µC. The UART remains ready to transmit immediately upon exit from shutdown.

What SPI timing modes are supported by MAX3110EEWI?

The MAX3110EEWI supports SPI mode 0 (CPOL = 0, CPHA = 0) exclusively - meaning data is sampled on the rising edge of SCLK and shifted out on the falling edge. It is also compatible with QSPI and MICROWIRE protocols under this same timing configuration. Attempting CPOL=1 or CPHA=1 will result in communication failure. All register reads/writes require strict 16-bit frames; partial transfers are aborted if CS goes high before bit 15.

Can MAX3110EEWI operate with a 3.3V supply?

No, the MAX3110EEWI is specified only for +4.5V to +5.5V operation. It is the +5V variant of the MAX3110E/MAX3111E family; the +3.3V counterpart is the MAX3111EEWI. Using 3.3V on MAX3110EEWI violates Absolute Maximum Ratings (VCC min = +4.5V) and will prevent proper RS-232 output voltage generation (±5.4V), leading to non-compliant signal levels and potential communication failure with standard RS-232 receivers.