MAX1840EUB

Specialized Overview

The MAX1840EUB is a low-voltage SIM and smart card level translator in a 10-pin µMAX package. It provides level shifting for reset, clock, and bidirectional data signals between controller-side (DVCC: +1.4V to +5.5V) and card-side (VCC: +1.7V to +5.5V) supplies. The device integrates ±10kV ESD protection on all card contacts and automatically shuts down when either supply is removed. Total operating supply current is 1.0µA, reducing to 0.01µA in shutdown mode. The component operates within a temperature range of -40°C to +85°C.

Specialized Feature Summary

• Provides unidirectional level translation for clock and reset signals alongside bidirectional translation for serial data streams.
• Integrates ±10kV electrostatic discharge protection on all card contact pins.
• Automatically enters shutdown mode upon power removal, actively pulling card interface pins low.
• Compliant with GSM test specifications 11.11 and 11.12.

Specialized Applications

• SIM interface circuits in GSM cellular telephones
• Smart card reader systems
• Logic level translation for SPI, QSPI, and MICROWIRE interfaces

Specialized Procurement Notes

Verify the specific ordering suffix against official documentation to confirm pin configuration and functional variants. Confirm that the component meets required environmental standards and packaging specifications before integration into production designs.

Specialized Selection Notes

Select the MAX1840EUB when a hardware shutdown control input is required for managing SIM insertion and removal sequences. Ensure the system controller supports open-drain outputs or utilizes external pull-ups compatible with the internal resistor values.

Specialized Part Context

This component belongs to the MAX1840/MAX1841 family of low-voltage level translators designed specifically for subscriber identity module and smart card applications. It serves as an interface bridge between varying logic voltage domains in mobile communication devices.

Specialized Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.

Specialized FAQ

How does the MAX1840 handle card insertion and removal?

Driving the SHDN input low activates shutdown mode, which actively pulls CLK, RST, and IO pins low to ensure they are at ground potential prior to card insertion.

What is the difference between the MAX1840 and MAX1841?

The MAX1840 includes a SHDN control input for shutdown management, whereas the MAX1841 includes a system-side data driver (DDRV) to support controllers without open-drain outputs.

Does the device latch up after an ESD event?

No, the MAX1840/MAX1841 continue working without latchup after an ESD event, provided the pins connect to the card socket and proper bypassing is used.