Analog Devices Inc./Maxim Integrated MAX3378EEBC-T

Overview

MAX3378EEBC-T from Maxim Integrated is a quad bidirectional ±15kV ESD-protected logic-level translator enabling voltage translation between VL = +1.2V to +5.5V and VCC = +1.65V to +5.5V domains. It supports guaranteed 8Mbps data rate across full voltage range, features three-state output mode (<1μA supply current), and uses transmission-gate architecture for true bidirectional (VL ↔ VCC) signal translation on each of four independent channels - deployed in portable POS systems and I²C/SPI interfaces between low-voltage microcontrollers and 3.3V peripherals.

For engineers reviewing the MAX3378EEBC-T datasheet, MAX3378EEBC-T pinout, MAX3378EEBC-T application, or MAX3378EEBC-T equivalent, key selection criteria include bidirectional channel count (4), guaranteed 8Mbps operation at 1.2V–5.5V VL/VCC ranges, ±15kV HBM ESD rating on VCC-side I/Os, thermal short-circuit protection, and TDFN-14 (3mm × 3mm) package compatibility with high-density portable designs.

Technical Context

The MAX3378EEBC-T implements a transmission-gate-based bidirectional level-shifting architecture, allowing seamless signal flow in either direction per channel without direction-control pins. Its internal speed-up circuitry - including one-shot triggered pull-up MOSFETs (PU1/PU2) - reduces rise time and propagation delay for low-to-high transitions, enabling up to 16Mbps operation under specific voltage conditions (+1.8V ≤ VL ≤ VCC ≤ +2.5V or +2.5V ≤ VL ≤ VCC ≤ +3.3V).

Three-state control is referenced to VL (not VCC), with logic thresholds VIH = VL − 0.2V and VIL = 0.15V. Thermal shutdown activates at TJ = +152°C, forcing three-state mode until junction cools to +142°C. ESD protection meets ±15kV HBM on all I/O VCC pins and ±8kV IEC 1000-4-2 contact discharge.

Key Specifications

Pinout & Package

MAX3378EEBC-T is housed in a 14-pin TDFN-EP package (3mm × 3mm, 0.5mm pitch) with exposed pad for thermal dissipation. Pin assignment follows standard quad bidirectional translator layout optimized for signal integrity and PCB routing density.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional level translation applications.

Compared with TXS0104E and SN74AVC4T245, the MAX3378EEBC-T delivers superior system-level reliability through integrated ±15kV HBM ESD and automatic thermal shutdown - critical for unattended portable equipment - while maintaining pin-compatible quad bidirectional functionality in the same 3mm × 3mm TDFN footprint.

Availability

MAX3378EEBC-T is available at Aetrix Electronics and suitable for portable POS systems, smart card readers, cell phone cradles, and I²C/SPI bus expansion requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant manufacturing.

Supply support for MAX3378EEBC-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) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, communications, and consumer applications.

The MAX3372E–MAX3379E family was engineered specifically for robust, low-power bidirectional level translation in battery-operated portable electronics where ESD resilience, small footprint, and wide voltage interoperability are mandatory.

FAQ

What voltage ranges does the MAX3378EEBC-T support on its VL and VCC supplies?

The MAX3378EEBC-T supports VL from +1.2V to +5.5V and VCC from +1.65V to +5.5V, with the constraint that VL must not exceed VCC + 0.3V during normal operation. This enables interfacing ultra-low-voltage ASICs (1.2V) with legacy 3.3V or 5V systems. The MAX3378EEBC-T maintains guaranteed 8Mbps performance across the entire overlapping range, and achieves up to 16Mbps in constrained domains like +1.8V ≤ VL ≤ VCC ≤ +2.5V.

How does the three-state mode function on the MAX3378EEBC-T, and what is its supply current impact?

The MAX3378EEBC-T enters three-state mode when the THREE-STATE pin is pulled low (logic low referenced to VL). In this state, all eight I/O terminals (I/O VL1–VL4 and I/O VCC1–VCC4) become high-impedance, and total supply current drops to less than 1μA - measured at TA = +25°C. This allows safe multidrop bus configurations and ultra-low-power sleep states. The MAX3378EEBC-T's three-state logic is VL-referenced, so the enable threshold is VIH = VL − 0.2V and VIL = 0.15V.

Does the MAX3378EEBC-T support open-drain driving, and how does it affect timing?

Yes, the MAX3378EEBC-T supports open-drain driving on both VL and VCC sides, with specified timing for 500kbps operation under those conditions. When driven open-drain, rise times increase (e.g., tRVCC = 170–400ns vs. 7–25ns for push-pull), and maximum data rate is reduced to 500kbps. The MAX3378EEBC-T's internal pull-downs and slew-rate control maintain signal integrity, but designers must account for longer rise/fall times in timing budgets - especially for I²C bus pull-up sizing.

What thermal protection mechanism does the MAX3378EEBC-T implement, and at what junction temperature does it activate?

The MAX3378EEBC-T incorporates thermal short-circuit protection that monitors die temperature and forces the device into three-state mode if the junction temperature reaches +152°C. Once activated, the device remains in three-state until the junction cools to +142°C, at which point normal operation resumes automatically. This self-recovering behavior prevents permanent damage during sustained overload or hot-plug faults - a key reliability feature for MAX3378EEBC-T in portable cradle and POS applications.

Is the MAX3378EEBC-T pin-compatible with other devices in the MAX337x family, and what package options share the same pinout?

Yes, the MAX3378EEBC-T shares identical pinout and functionality with MAX3377E and MAX3379E in the 14-pin TDFN-EP and 14-pin TSSOP packages. All three are quad bidirectional translators with matching pin assignments for VCC, VL, THREE-STATE, GND, and four I/O pairs. This allows drop-in replacement across speed grades (MAX3377E = 230kbps, MAX3378EEBC-T = 8Mbps, MAX3379E = 8Mbps unidirectional) without PCB redesign - a key advantage of the MAX3378EEBC-T in scalable product families.