Analog Devices Inc./Maxim Integrated MAX1841EUB

Overview

MAX1841EUB from Maxim Integrated is a bidirectional SIM/smart card level translator IC with integrated ±10kV ESD protection, supporting 1.4V–5.5V controller-side (DVCC) and 1.7V–5.5V card-side (VCC) voltage ranges, 1µA quiescent current, and 5–20MHz maximum CLK frequency - deployed in GSM cellular handsets and smart card readers for safe hot-insertion.

For engineers reviewing the MAX1841EUB datasheet, MAX1841EUB pinout, MAX1841EUB application, or MAX1841EUB equivalent, key selection criteria include bidirectional DATA/IO translation capability, DDRV-driven system-side data output support, shutdown-controlled active-low outputs (CLK/RST/IO), ESD robustness on card-contact pins, and µMAX package compatibility with space-constrained mobile designs.

Technical Context

The MAX1841EUB implements three dedicated level-shifting paths: unidirectional CIN→CLK and RIN→RST for clock/reset signals, and bidirectional DATA↔IO for serial data, with internal pull-ups (20kΩ to DVCC on DATA; 10kΩ to VCC on IO). It includes a dedicated DDRV input enabling push-pull microcontrollers to drive card-side data without external circuitry.

Shutdown behavior is triggered by removing either DVCC or VCC (auto-shutdown) or by driving DDRV low (MAX1841-specific control path); during shutdown, CLK, RST, and IO are actively pulled low, and the DATA–IO transfer gate is disabled - satisfying GSM 11.11/11.12 insertion/removal safety requirements.

Key Specifications

Pinout & Package

MAX1841EUB is housed in a 10-pin µMAX package (3.0mm × 3.0mm × 1.09mm), lead-free and RoHS-compliant, with no exposed pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SIM/smart card level translation applications.

Compared with MAX1840EUB, MAX1841EUB adds DDRV-driven data transmission flexibility but removes SHDN - making it optimal for push-pull MCU platforms; MAX3232ESE+ serves entirely different serial protocols and cannot replace MAX1841EUB in SIM/smart card applications due to missing GSM compliance, auto-shutdown, and card-side voltage management.

Availability

MAX1841EUB is available at Aetrix Electronics and suitable for GSM handset design, smart card reader manufacturing, and industrial MICROWIRE peripheral integration requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for MAX1841EUB 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 automotive, industrial, and communications systems.

The MAX1841EUB belongs to Maxim's SIM/smart card interface product line, engineered specifically to simplify multivoltage card connectivity while meeting stringent GSM 11.11/11.12 mechanical and electrical safety requirements.

FAQ

What is the primary function of the MAX1841EUB in a SIM interface?

The MAX1841EUB serves as a voltage-level translator and ESD protector between a system controller (e.g., baseband processor) and a SIM or smart card. It shifts clock (CIN→CLK), reset (RIN→RST), and bidirectional data (DATA↔IO) signals across independent DVCC (1.4–5.5V) and VCC (1.7–5.5V) domains while providing ±10kV ESD protection on all card-contact pins - ensuring safe hot insertion per GSM standards. The MAX1841EUB integrates internal pull-ups and DDRV support for push-pull controllers.

How does the DDRV pin on the MAX1841EUB differ from the SHDN pin on the MAX1840EUB?

The DDRV pin on the MAX1841EUB is a dedicated data driver input that allows push-pull microcontrollers to transmit data to the card via the IO pin - eliminating need for external drivers. In contrast, the SHDN pin on the MAX1840EUB is a shutdown enable that forces CLK, RST, and IO low when driven low. The MAX1841EUB omits SHDN and relies on supply removal or DDRV control for safe insertion/removal sequencing - a key architectural distinction confirmed in the pin description and functional block diagram.

Does the MAX1841EUB support bidirectional data transfer when the system controller lacks an open-drain output?

Yes - the MAX1841EUB supports bidirectional data transfer even with push-pull controllers via its DDRV pin. When DDRV is driven low, it enables the MAX1841EUB to drive the IO pin high or low to send data to the card; DATA remains the controller-side receive path. This capability is explicitly documented in the "Data Driver (MAX1841 Only)" section and distinguishes MAX1841EUB from MAX1840EUB, which requires open-drain DATA control and offers no DDRV functionality.

What is the significance of the ±10kV ESD rating on the MAX1841EUB's CLK, RST, IO, VCC, and GND pins?

The ±10kV Human Body Model (HBM) ESD rating on CLK, RST, IO, VCC, and GND pins ensures the MAX1841EUB withstands electrostatic discharge events encountered during SIM card insertion, removal, and handling - directly satisfying GSM 11.11 mechanical test requirements. This on-die protection eliminates need for external TVS diodes, reduces PCB area, and guarantees continued operation post-ESD event without latch-up, as verified in the ESD Protection section and Absolute Maximum Ratings table.

Can the MAX1841EUB operate with DVCC lower than VCC, such as 1.8V DVCC and 3.0V VCC?

Yes - the MAX1841EUB is explicitly designed to support level translation in both directions: DVCC ≥ VCC and DVCC ≤ VCC. The datasheet confirms valid operation with DVCC = 1.8V and VCC = 3.0V (or 5.0V), enabling use in modern low-voltage SoCs interfacing with legacy 3V/5V smart cards. This bidirectional voltage tolerance is stated in the Features list and validated across Electrical Characteristics tables for all signal paths (CLK, RST, DATA/IO).