MAXQ1740 Datasheet, PDF (1/3 Pages) Maxim Integrated Products – Magnetic Card Reader Security Microcontroller Optimized for C-Compiler

ABRIDGED DATA SHEET
19-5893; Rev 0; 6/11
MAXQ1740
Magnetic Card Reader Security Microcontroller
General Description
Features
The MAXQ1740 is a low-power microcontroller that inte-
grates a triple-track magnetic stripe reader interface, an
I²C interface, two SPIK interfaces, and one universal
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-
gle-cycle 16-bit RISC MAXQ^M CPU powers the device. It
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
S Core Functionality
 High-Performance, Low-Power, 16-Bit MAXQ20C
RISC Core
 6MHz Internal Oscillator (±10%)
 Up to 12MHz External Crystal Supported
 1.7V to 3.6V Operating Voltage
 1-Wire^® Interface for Debugger and Flash
Programming
 Optimized for C-Compiler
S Security
 AES Hardware Accelerators
 Hardware True Random-Number Generator
 Self-Destruct Input for Tamper Detection
 Permanent Loader Lockout Option
 Code Scrambling
S Memory
 16KB Flash Memory
512 Bytes Memory Page Sectors
1000 Erase/Write Cycles per Sector
 1152 Bytes Fast-Wipe NV SRAM, 128 Bytes
Usable by Cryptographic Engine
 6KB Utility ROM with User-Callable Routines
S I/O and Peripherals
 Triple-Track Magnetic Stripe Head Interface
 Two SPI Communication Ports
 USART Communication Port
 Two 16-Bit Timers
 I²C Communication Port
 Up to 16 General-Purpose I/O Pins
 Up to 8 External Interrupt Pins
S Low Power Consumption
 3µA Current in Lowest Power Stop Mode
 3.75mA (typ) at 6MHz, 0.8mA (typ) at 1MHz
 Divided System Clock Modes Available
S Additional Peripherals
 On-Chip Power-On/Power-Fail Reset
 Supply Overvoltage Detection
 Programmable Watchdog Timer
 Wake-Up Timer
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.
For related parts and recommended products to use with this part, refer to: www.maxim-ic.com/MAXQ1740.related
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device may
be simultaneously available through various sales channels. For information about device errata, go to: www.maxim-ic.com/errata.
����������������������������������������������������������������� Maxim Integrated Products   1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.