Analog Devices Inc./Maxim Integrated MAX1741EUB+

Overview

The MAX1741EUB+ from Maxim Integrated is a SIM/smart card level translator IC that provides bidirectional data, unidirectional clock/reset level shifting, and ±10kV HBM ESD protection for GSM-compliant cellular handsets and smart card readers. It supports controller-side DVCC from +1.425V to +5.5V and card-side VCC from +2.25V to +5.5V, with 2.5µA max operating current and automatic shutdown on supply loss.

For engineers reviewing the MAX1741EUB+ datasheet, MAX1741EUB+ pinout, MAX1741EUB+ application, or MAX1741EUB+ equivalent, key selection criteria include its DDRV-enabled push-pull data driver (distinguishing it from MAX1740), 10-pin µMAX package height of 1.09mm, GSM 11.11/11.12 compliance, and support for SPI/QSPI/MICROWIRE voltage translation in multivoltage embedded systems.

Technical Context

The MAX1741EUB+ integrates three level-shifting channels: unidirectional CIN→CLK and RIN→RST paths, and a bidirectional DATA↔IO path with internal 20kΩ pull-up to DVCC and 10kΩ pull-up to VCC. Its DDRV input enables system controllers lacking open-drain outputs to drive the card-side IO line actively.

Shutdown is triggered by removing either DVCC or VCC, reducing total supply current to ≤0.01µA while pulling CLK, RST, and IO low. All card-contact pins (CLK, RST, IO, VCC, GND) are rated for ±10kV HBM ESD, and level translation remains valid whether DVCC ≥ VCC or DVCC ≤ VCC.

Key Specifications

Pinout & Package

MAX1741EUB+ uses a 10-pin µMAX package (3.0mm × 3.0mm × 1.09mm), RoHS-compliant, 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 MAX1740EUB+, the MAX1741EUB+ adds active data driving capability for push-pull controllers, while versus TXS0102DCUR it delivers certified GSM-level ESD protection and automatic dual-rail shutdown - eliminating four external components and simplifying regulatory certification.

Availability

MAX1741EUB+ is available at Aetrix Electronics and suitable for GSM handset design, smart card reader manufacturing, and SPI/MICROWIRE voltage translation applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for MAX1741EUB+ 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 high-reliability ICs for automotive, industrial, and communications markets, with over 40 years of leadership in power management and interface solutions.

The MAX1741EUB+ belongs to Maxim's SIM/smart card interface product line, engineered specifically to simplify GSM 11.11/11.12-compliant handset and reader designs by integrating level shifting, ESD protection, and hot-swap sequencing into a single 10-pin µMAX device.

FAQ

What is the key functional difference between MAX1741EUB+ and MAX1740EUB+?

The MAX1741EUB+ includes a DDRV (Data Driver) input that allows system controllers without open-drain outputs to actively drive the card-side IO line, whereas the MAX1740EUB+ requires the controller's DATA pin to be configured as open-drain. This makes MAX1741EUB+ compatible with standard push-pull GPIOs found in most modern microcontrollers, eliminating external driver circuitry. Both share identical pinout, package, ESD rating, and shutdown behavior.

Does MAX1741EUB+ require external pull-up resistors on the DATA or IO lines?

No, the MAX1741EUB+ integrates a 20kΩ pull-up resistor from DATA to DVCC and a 10kΩ pull-up resistor from IO to VCC. These internal resistors meet GSM 11.11 timing requirements for 30pF loads and eliminate the need for external components. External pull-ups are unnecessary and may degrade rise time or increase current consumption if added in parallel.

How does MAX1741EUB+ handle SIM card insertion and removal safely?

The MAX1741EUB+ automatically enters shutdown mode when either DVCC or VCC is removed, pulling CLK, RST, and IO low within microseconds. This satisfies GSM 11.11 mechanical requirements for zero-voltage card insertion. During removal, the same behavior prevents back-driving or latch-up in the SIM. No external control logic is needed - the function is fully autonomous and rail-dependent.

Can MAX1741EUB+ translate between 1.8V and 5V logic domains?

Yes, the MAX1741EUB+ supports asymmetric operation with DVCC as low as +1.425V (e.g., 1.8V system) and VCC as high as +5.5V (e.g., 5V smart card). Its level-shifting architecture works bidirectionally regardless of which supply is higher, enabling direct interfacing between ultra-low-power MCUs and legacy 5V cards without external regulators or translators.

Is MAX1741EUB+ compliant with any industry standards beyond GSM?

The MAX1741EUB+ is explicitly compliant with GSM specifications 11.11 (mechanical and electrical characteristics) and 11.12 (ESD testing), verified per Human Body Model ±10kV. While not certified to ISO/IEC 7816-3, its electrical behavior (10kΩ IO pull-up, 1mA sink capability, 5MHz CLK support) aligns with that standard's requirements for Class A/B cards, making it suitable for EMV and payment terminal use cases.