MAXQ1740

Magnetic Card Reader Security Microcontroller

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ABRIDGED DATA SHEET

General Description

The MAXQ1740 is a low-power microcontroller that inte-

grates a triple-track magnetic stripe reader interface, an

synchronous/asynchronous receiver-transmitter (USART)

interface. Security features include an AES encryption

engine, a true hardware random-number generator, volt-

age-attack sensors, and a self-destruct input pin. A sin-

provides a high level of security for the magnetic stripe

reader by placing an ultra-secure microcontroller with

high-speed hardware encryption inside the magnetic

card reader head.

The device provides 16KB of flash memory, 1KB of fast-

wipe nonvolatile SRAM (NV SRAM), and 128 bytes of

data NV SRAM that instantaneously zeroizes its contents

when a tamper is detected. The 128 bytes can be used

as data RAM or working RAM for the AES. The fast-wipe

feature ensures that any data in the 1KB of memory is

destroyed before any application software can access it.

Factory programming of a unique 64-bit serial number,

and/or customer secret key(s), is available upon request.

The microcontroller runs within a wide 1.7V to 3.6V oper-

ating range. User-application firmware interfaces with the

triple-track magnetic stripe interface. Reference software

supports the reading of cards adhering to ISO 7811, ISO

7812, and ISO 7813. Source code to the reference soft-

ware is available so applications can make adjustments

for custom card formats.

An ultra-low-power stop mode provides the ultimate in

low-power performance. In this mode, only a minimum

amount of circuitry is powered to support detection of

self-destruct events. When the main power supply is

present and the microcontroller is in stop mode, the

device has the option of exiting stop mode when stimulat-

ed by general-purpose port pins or the serial interfaces.

Applications

ATM/POS Terminals

Physical Security/Building Access

Features

S

CoreFunctionality



High-Performance,Low-Power,16-BitMAXQ20C

 RISCCore



6MHzInternalOscillator(±10%)



Upto12MHzExternalCrystalSupported



1.7Vto3.6VOperatingVoltage



 Programming



OptimizedforC-Compiler

S

Security



AESHardwareAccelerators



HardwareTrueRandom-NumberGenerator



Self-DestructInputforTamperDetection



PermanentLoaderLockoutOption



CodeScrambling

S

Memory



16KBFlashMemory

512BytesMemoryPageSectors

1000Erase/WriteCyclesperSector



1152BytesFast-WipeNVSRAM,128Bytes

 UsablebyCryptographicEngine



6KBUtilityROMwithUser-CallableRoutines

S

I/OandPeripherals



Triple-TrackMagneticStripeHeadInterface



TwoSPICommunicationPorts



USARTCommunicationPort



Two16-BitTimers





Upto16General-PurposeI/OPins



Upto8ExternalInterruptPins

S

LowPowerConsumption



3µACurrentinLowestPowerStopMode



3.75mA(typ)at6MHz,0.8mA(typ)at1MHz



DividedSystemClockModesAvailable

S

AdditionalPeripherals



On-ChipPower-On/Power-FailReset



SupplyOvervoltageDetection



ProgrammableWatchdogTimer



Wake-UpTimer

19-5893; Rev 0; 6/11

Ordering Information appears at end of data sheet.

SPI is a trademark of Motorola, Inc.

MAXQ and 1-Wire are registered trademarks of Maxim Integrated Products, Inc.

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device may

Forpricing,delivery,andorderinginformation,pleasecontactMaximDirectat1-888-629-4642,

orvisitMaxim’swebsiteatwww.maxim-ic.com.