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REV: 070706

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, click here: www.maxim-ic.com/errata.

FEATURES

8-Bit 8051-Compatible Microcontroller

Adapts to Task at Hand

8 or 32 kbytes of Nonvolatile RAM for

Program and/or Data Memory Storage

Initial Downloading of Software in End

System via On-Chip Serial Port

Capable of Modifying Its Own Program

and/or Data Memory in End Use

Crashproof Operation

Maintains All Nonvolatile Resources for 10

Temperature

Power-Fail Reset

Early Warning Power-Fail Interrupt

Watchdog Timer

Software Security Feature

Executes Encrypted Software to Prevent

Unauthorized Disclosure

On-Chip, Full-Duplex Serial I/O Ports

Two On-Chip Timer/Event Counters

32 Parallel I/O Lines

Compatible with Industry Standard 8051

Instruction Set and Pinout

Optional Permanently Powered Real-Time

Clock (DS5000T)

PIN ASSIGNMENT

DESCRIPTION

The DS5000(T) Soft Microcontroller Module is a fully 8051-compatible 8-bit CMOS microcontroller that

offers “softness” in all aspects of its application. This is accomplished through the comprehensive use of

program/data memory space is implemented using either 8 or 32 kbytes of nonvolatile CMOS SRAM.

Furthermore, internal data registers and key configuration registers are also nonvolatile. An optional real-

time clock (RTC) gives permanently powered timekeeping. The clock keeps time to a hundredth of a

second using an on-board crystal.

Note: This data sheet provides ordering information, pinout, and electrical specifications. Refer to the

Secure Microcontroller User’s Guide for operating information.

DS5000(T)

Soft Microcontroller Module

www.maxim-ic.com

1

P1.0

2

P1.1

3

P1.2

4

P1.3

5

P1.4

6

P1.5

7

P1.6

8

P1.7

9

RST

10

RXD P3.0

11

TXD P3.1

12

INT0 P3.2

13

INT1 P3.3

14

T0 P3.4

15

T1 P3.5

16

WR P3.6

17

RD P3.7

18

XTAL2

19

XTAL1

20

GND

40

P0.0 AD0

39

P0.1 AD1

38

P0.2 AD2

37

P0.3 AD3

36

P0.4 AD4

35

P0.5 AD5

34

P0.6 AD6

33

P0.7 AD7

32

EA

31

ALE

30

PSEN

29

P2.7 A15

28

P2.6 A14

27

P2.5 A13

26

P2.4 A12

25

P2.3 A11

24

P2.2 A10

23

P2.1 A9

22

P2.0 A8

21

40-Pin Encapsulated Package

DS5000(T)