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General Description

The MAX1840/MAX1841 subscriber identity module

(SIM)/smart card level translators provide level shifting

and electrostatic discharge (ESD) protection for SIM and

smart card ports. These devices integrate two unidirec-

tional level shifters for the reset and clock signals, a bidi-

rectional level shifter for the serial data stream, and

±10kV ESD protection on all card contacts.

The MAX1840 includes a SHDN control input to aid

insertion and removal of SIM and smart cards, while the

MAX1841 includes a system-side data driver to support

system controllers without open-drain outputs. The logic

supply voltage range is +1.4V to +5.5V for the “controller

side” and +1.7V to +5.5V for the “card side.” Total sup-

ply current is 1.0µA. Both devices automatically shut

down when either power supply is removed. For a com-

plete SIM card interface, combine the MAX1840/

MAX1841 with the MAX1686H 0V/3V/5V regulated

charge pump.

The MAX1840/MAX1841 are available in ultra-small

10-pin µMAX packages that are only 1.09mm high and

half the area of an 8-pin SO.

The MAX1840/MAX1841 are compliant with GSM test

specifications 11.11 and 11.12.

Applications

SIM Interface in GSM Cellular Telephones

Smart Card Readers

Logic Level Translation

SPI™/QSPI™/MICROWIRE™ Level Translation

Features

o SIM/Smart Card Level Shifting

o +1.4V to +5.5V Controller Voltage Range

o +1.7V to +5.5V Card Voltage Range

o ±10kV ESD Card Socket Protection

o Automatically Shuts Down When Either Supply Is

Removed

o Card Contacts Actively Pulled Low During

Shutdown

o 1µA Total Quiescent Supply Current

o 0.01µA Total Shutdown Supply Current

o Ultra-Small 10-Pin µMAX Package

o Compliant with GSM Test Specifications 11.11

and 11.12

Low-Voltage SIM/Smart Card

Level Translators in µMAX

________________________________________________________________ Maxim Integrated Products

1

IO

1

DATA

2

3

4

5

9

8

7

6

CLK

RST

GND

SHDN (DDRV)

( ) ARE FOR MAX1841.

RIN

CIN

10

MAX1840

MAX1841

µMAX

TOP VIEW

SIM OR

SMART

CARD

SYSTEM

CONTROLLER

CLK

IO

GND

GND

IO

CLK

GND

MAX1840

MAX1841

SHDN*

OPTIONAL

RIN

CIN

RST

RST

OPTIONAL

DATA

DDRV*

SHDN FOR MAX1840 ONLY;

DDRV FOR MAX1841 ONLY.

*

Typical Operating Circuit

19-1716; Rev 0; 4/00

PART

MAX1840EUB

MAX1841EUB

-40°C to +85°C

-40°C to +85°C

TEMP. RANGE

PIN-PACKAGE

10 µMAX

10 µMAX

Pin Configuration

Ordering Information

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.