DESCRIPTION
The DS1315 Phantom Time Chip is a combination of a CMOS timekeeper and a nonvolatile memory controller. In the absence of power, an external battery maintain the timekeeping operation and provides power for a CMOS static RAM. The watch keeps track of hundredths of seconds, seconds, minutes, hours, day, date, month, and year information. The last day of the month is automatically adjusted for months with less than 31 days, including leap year correction. The watch operates in one of two formats: a 12-hour mode with an AM/PM indicator or a 24-hour mode. The nonvolatile controller supplies all the necessary support circuitry to convert a CMOS RAM to a nonvolatile memory. The DS1315 can be interfaced with either RAM or ROM without leaving gaps in memory.

FEATURES
*Real-Time Clock Keeps Track of Hundredths of Seconds, Seconds, Minutes, Hours, Days, Date of the Month, Months, and Years
*Adjusts for Months with Fewer than 31 Days
*Automatic Leap Year Correction Valid Up to 2100
*No Address Space Required to Communicate with RTC
*Provides Nonvolatile Controller Functions for Battery Backup of SRAM
*Supports Redundant Battery Attachment for High-Reliability Applications
*Full ±10% VCC Operating Range
*+3.3V or +5V Operation
*Industrial (–45°C to +85°C) Operating Temperature Ranges Available
*Drop-In Replacement for DS1215

DS1315-33, DS1315N-33, DS1315-5, DS1315N-5

GENERAL DESCRIPTION
The DS28E01-100 combines 1024 bits of EEPROM with challenge-and-response authentication security implemented with the ISO/IEC 10118-3 Secure Hash Algorithm (SHA-1). The 1024-bit EEPROM array is configured as four pages of 256 bits with a 64-bit scratchpad to perform write operations. All memory pages can be write protected, and one page can be put in EPROM-emulation mode, where bits can only be changed from a 1 to a 0 state. Each DS28E01-100 has its own guaranteed unique 64-bit ROM registration number that is factory lasered into the chip. The DS28E01-100 communicates over the single-contact 1-Wire® bus. The communication follows the standard Dallas Semiconductor 1-Wire protocol with the registration number acting as node address in the case of a multi-device 1-Wire network.

FEATURES
*1024 bits of EEPROM memory partitioned into four pages of 256 bits
*On-chip 512-bit SHA-1 engine to compute 160-bit Message Authentication Codes (MAC) and to generate secrets
*Write access requires knowledge of the secret and the capability of computing and transmitting a 160-bit MAC as authorization
*User-programmable page write-protection for page 0, page 3 or all four pages together
*User-programmable OTP EPROM emulation mode for page 1 ("write to 0")
*Communicates to host with a single digital signal at 15.3k bits or 125k bits per second using 1-Wire protocol
*Switchpoint Hysteresis and Filtering to Optimize Performance in the Presence of Noise
*Reads and writes over a wide voltage range of 2.8V to 5.25V from -40°C to +85°C
*6-lead TSOC, 2-lead SFN or solder-bumped chipscale surface mount package

APPLICATIONS
*Printer Cartridge Configuration and Monitoring
*Medical Sensor Authentication and Calibration
*System Intellectual Property Protection

DS28E01P-100, DS28E01P-100/T&R, DS28E01P-100+, DS28E01P-100+T&R

General Description
The DS2045 is a 1Mb reflowable nonvolatile (NV) SRAM, which consists of a static RAM (SRAM), an NV controller, and an internal rechargeable manganese lithium (ML) battery. These components are encased in a surface-mount module with a 256-ball BGA footprint. Whenever VCC is applied to the module, it recharges the ML battery, powers the SRAM from the external power source, and allows the contents of the SRAM to be modified. When VCC is powered down or out of tolerance, the controller write-protects the SRAM’s contents and powers the SRAM from the battery. Two versions of the DS2045 are available, which provide either a 5% or 10% power-monitoring trip point. The DS2045 also contains a power-supply monitor output, RST, which can be used as a CPU supervisor for a microprocessor.

Features
*Single-Piece, Reflowable, 27mm2 PBGA Package Footprint
*Internal ML Battery and Charger
*Unconditionally Write-Protects SRAM when VCC is Out-of-Tolerance
*Automatically Switches to Battery Supply when VCC Power Failures Occur
*Internal Power-Supply Monitor Detects Power Fail at 5% or 10% Below Nominal VCC (5V)
*Reset Output can be used as a CPU Supervisor for a Microprocessor
*Industrial Temperature Range (-40°C to +85°C)
*UL Recognized

Applications
*RAID Systems and Servers
*Industrial Controllers
*Gaming
*Router/Switches
*POS Terminals
*Data-Acquisition Systems
*Fire Alarms
*PLC

DS2045AB-70, DS2045AB-100, DS2045Y-70, DS2045Y-100

DESCRIPTION
The DS87C520/DS83C520 EPROM/ROM High-Speed Micro is a fast 8051-compatible microcontroller. It features a redesigned processor core without wasted clock and memory cycles. As a result, it executes every 8051 instruction between 1.5 and 3 times faster than the original for the same crystal speed. Typical applications will see a speed improvement of 2.5 times using the same code and the same crystal. The DS87C520/DS83C520 offers a maximum crystal speed of 33 MHz, resulting in apparent execution speeds of 82.5 MHz (approximately 2.5X).
The DS87C520/DS83C520 is pin-compatible with all three packages of the standard 8051 and includes standard resources such as three timer/counters, serial port, and four 8-bit I/O ports. It features 16 kB of EPROM or Mask ROM with an extra 1 kB of data RAM. Both OTP and windowed packages are available.
Besides greater speed, the microcontroller includes a second full hardware serial port, seven additional interrupts, programmable Watchdog Timer, Brown-out Monitor, and Power-Fail Reset. The device also provides dual data pointers (DPTRs) to speed block data memory moves. It also can adjust the speed of MOVX data memory access from two to nine machine cycles for flexibility in selecting external memory and peripherals.
A new Power Management Mode (PMM) is useful for portable applications. This feature allows software to select a lower speed clock as the main time base. While normal operation has a machine cycle rate of 4 clocks per cycle, the PMM runs the processor at 64 or 1024 clocks per cycle. For example, at 12 MHz, standard operation has a machine cycle rate of 3 MHz. In Power Management Mode, software can select either 187.5 kHz or 11.7 kHz machine cycle rate. There is a corresponding reduction in power consumption when the processor runs slower.
The EMI reduction feature allows software to select a reduced emission mode. This disables the ALE signal when it is unneeded.
The DS83C520 is a factory Mask ROM version of the DS87C520 designed for high-volume, costsensitive applications. It is identical in all respects to the DS87C520, except that the 16 kB of EPROM is replaced by a user-supplied application program. All references to features of the DS87C520 will apply to the DS83C520, with the exception of EPROM-specific features where noted. Please contact your local Dallas Semiconductor sales representative for ordering information.

FEATURES
*80C52-compatible
-8051 pin and instruction set compatible
-Four 8-bit I/O ports
-Three 16-bit timer/counters
-256 bytes scratchpad RAM
*Large on-chip memory
-16kB program memory
-1kB extra on-chip SRAM for MOVX
*ROMSIZE feature
-Selects internal ROM size from 0 to 16kB
-Allows access to entire external memory map
-Dynamically adjustable by software
-Useful as boot block for external FLASH
*High-speed architecture
-4 clocks/machine cycle (8051 = 12)
-Runs DC to 33MHz clock rates
-Single-cycle instruction in 121ns
-Dual data pointer
-Optional variable length MOVX to access fast/slow RAM/peripherals
*Power Management Mode
-Programmable clock source to save power
-CPU runs from (crystal/64) or (crystal/1024)
-Provides automatic hardware and software exit
*EMI Reduction Mode disables ALE
*Two full-duplex hardware serial ports
*High integration controller includes:
-Power-Fail Reset
-Early-Warning Power-Fail Interrupt
-Programmable Watchdog Timer
*13 total interrupt sources with 6 external
*Available in 40-pin PDIP, 44-pin PLCC, 44-pin TQFP, and 40-pin windowed CERDIP
*Factory Mask DS83C520 or EPROM (OTP) DS87C520

DS87C520-MCL, DS87C520-QCL, DS87C520-ECL, DS87C520-MNL, DS87C520-QNL

GENERAL DESCRIPTION
The DS1688/DS1691 are real-time clocks (RTCs) designed as successors to the industry standard DS1285, DS1385, DS1485, and DS1585 PC real-time clocks. These devices provide the industry standard DS1285 clock function with the new feature of either +3.0V or +5.0V operation and automatic backup and write protection to an external SRAM. The DS1688 also incorporates a number of enhanced features including a silicon serial number, power-on/off control circuitry, 114 bytes of user NV SRAM, power-on elapsed timer, and power-cycle counter.

FEATURES
Incorporates Industry Standard DS1287 PC Clock Plus Enhanced Features:
*+3V or +5V Operation
*64-Bit Silicon Serial Number
*64-Bit Customer Specific ROM or Additional Serial Number Available
*Power Control Circuitry Supports System Power-On from Date/Time Alarm or Key Closure
*Automatic Battery Backup and Write Protection to External SRAM
*Crystal Select Bit Allows RTC to Operate with 6Pf or 12.5Pf Crystal
*114 Bytes User NV RAM
*Auxiliary Battery Input
*RAM Clear Input
*Century Register
*32kHz Output for Power Management
*32-Bit VCC Powered Elapsed Time Counter
*32-Bit VBAT Powered Elapsed Time Counter
*16-Bit Power-Cycle Counter
*Compatible with Existing BIOS for Original DS1287 Functions
*Available as IC (DS1688) or Stand-Alone Module with Embedded Battery and Crystal (DS1691)
*Timekeeping Algorithm Includes Leap Year Compensation Valid Up to 2100

DS1688S, DS1688S+, DS1691

DESCRIPTION
The DS5000FP Soft Microprocessor Chip is an 8051-compatible processor based on NV RAM
technology. It is substantially more flexible than a standard 8051, yet provides full compatibility with the 8051 instruction set, timers, serial port, and parallel I/O ports. By using NV RAM instead of ROM, the user can program and then reprogram the microcontroller while in-system. The application software can even change its own operation, which allows frequent software upgrades, adaptive programs, customized systems, etc. In addition, by using NV SRAM, the DS5000FP is ideal for data-logging applications and it connects easily to a Dallas real-time clock for time stamp and date.
The DS5000FP provides the benefits of NV RAM without using I/O resources. It uses a non-multiplexed Byte-wide address and data bus for memory access. This bus can perform all memory access and provides decoded chip enables for SRAM. This leaves the 32 I/O port pins free for application use. The DS5000FP uses ordinary SRAM and battery backs the memory contents with a user’s external lithium cell. Data is maintained for over 10 years with a very small lithium cell. A DS5000FP also provides crashproof operation in portable systems or systems with unreliable power. These features include the ability to save the operating state, Power-fail Reset, Power-fail Interrupt, and Watchdog Timer.
A user loads programs into the DS5000FP via its on-chip Serial Bootstrap Loader. This function
supervises the loading of code into NV RAM, validates it, then becomes transparent to the user. Software can be stored in an 8-kbyte or 32-kbyte CMOS SRAM. Using its internal Partitioning, the DS5000FP will divide this common RAM into user programmable code and data segments. This Partition can be selected at program loading time, but can be modified anytime later. It will decode memory access to the SRAM, communicate via its Byte-wide bus and write-protect the memory portion designated as ROM.
Combining program and data storage in one device saves board space and cost. The DS5000FP can also access a second 32 kbytes of NV RAM but this area is restricted to data memory. For a user that wants a pre-constructed module using the DS5000FP, RAM, lithium cell, and optional real time clock; the DS2250(T) and DS5000(T) are available and described in separate data sheets. More details are also contained in the User’s Guide section of the Secure Microcontroller Data Book.

FEATURES
*8051-compatible microprocessor adapts to task
- Accesses between 8kB and 64kB of nonvolatile SRAM
- In-system programming via on-chip serial port
- Can modify its own program or data memory
- Accesses memory on a separate Bytewide bus
*Crashproof operation
- Maintains all nonvolatile resources for over 10 years
- Power-fail Reset
- Early Warning Power-fail Interrupt
- Watchdog Timer
- User-supplied lithium battery backs user SRAM for program/data storage
*Software security
- Executes encrypted programs to prevent observation
- Security lock prevents download
- Unlocking destroys contents
*Fully 8051-compatible
- 128 bytes scratchpad RAM
- Two timer/counters
- On-chip serial port
- 32 parallel I/O port pins

DS5000FP-16

DESCRIPTION
The DS2251T is an 8051 compatible microcontroller module based on nonvolatile RAM technology. It is designed for systems that need large quantities of nonvolatile memory. Like other members of the Secure Microcontroller family, it provides full compatibility with the 8051 instruction set, timers, serial port, and parallel I/O ports. By using NVRAM instead of ROM, the user can program, then reprogram the microcontroller while in–system. The application software can even change its own operation. This allows frequent software upgrades, adaptive programs, customized systems, etc. In addition, by using NVRAM, the DS2251T is ideal for data logging applications. The powerful real time clock includes interrupts for time stamp and date. It keeps time to one hundredth of second using its on–board 32 KHz crystal.
The DS2251T provides the benefits of NVRAM without using I/O resources. Between 32K bytes and 128K bytes of on–board NVRAM are available. A non–multiplexed Byte–wide address and data bus is used for memory access. This bus, which is available at the connector, can perform all memory access and also provides decoded chip enables for off–board memory mapped peripherals. This leaves the 32 I/O port pins free for application use.
The DS2251T provides high–reliability operation in portable systems or systems with unreliable power. These features include the ability to save the operating state, Power–fail Reset, Power–fail Interrupt, and Watchdog Timer. All nonvolatile memory and resources are maintained for over 10 years at room temperature in the absence of power.
A user loads programs into the DS2251T via its on–chip Serial Bootstrap Loader. This function supervises the loading of software into NVRAM, validates it, then becomes transparent to the user. Software is stored in on–board CMOS SRAM. Using its internal Partitioning, the DS2251T can divide a common RAM into user selectable program and data segments. This Partition can be selected at program loading time, but can be modified anytime later. The microprocessor will decode memory access to the SRAM, access memory via its Byte–wide bus and write–protect the memory portion designated as program (ROM).

FEATURES
*8051 compatible microcontroller adapts to its task
– 32K, 64K, or 128K bytes of nonvolatile SRAM for program and/or data storage
– In–system programming via on–chip serial port
– Capable of modifying its own program or data memory in the end system
– Provides separate Byte–wide bus for peripherals
– Performs CRC–16 check of NVRAM memory
*High–reliability Operation
– Maintains all nonvolatile resources for over 10 years in the absence of power
– Power–fail reset
– Early Warning Power–fail Interrupt
– Watchdog Timer
– Lithium backed memory remembers system state
– Precision reference for power monitor
*Fully 8051 Compatible
– 128 bytes scratchpad RAM
– Two timer/counters
– On–chip serial port
– 32 parallel I/O port pins
*Permanently powered real time clock

DS2251T–32–16, DS2251T–64–16, DS2251T–128–16

DESCRIPTION
The DS2109 is intended for one chip Plug and Play (PnP) SCSI termination.
Plug and Play SCSI requires the exit–point terminator on computer motherboards or host bus adapters to automatically switch off if an external device is connected to the system.
The DS2109 satisfies this requirement by offering the engineer a choice of onboard current sensing circuitry or onboard ground detect circuitry.
If an external device is connected, the DS2109 will automatically be isolated from the SCSI
bus thereby maintaining proper system termination.
The DS2109 integrates a low drop–out regulator, 18 precise switched 110 ohm termination resistors, and bus termination sensors into a 28–pin 300 mil SOIC package.
Active termination provides: greater immunity to voltage drops on the TERMPWR (TERMination PoWeR) line, enhanced high–level noise immunity, intrinsic TERMPWR decoupling, and very low quiescent current consumption.
The DS2109 contains an output port that can control the power down pin of additional terminators (DS21S07A) for Wide SCSI applications.

FEATURES
* Fully compliant with SCSI–1, Fast SCSI and Ultra SCSI
* Compatible with Plug and Play SCSI Profile
* Functionally compatible with DS21S07A
* Provides active termination for 18 signal lines
* 2% tolerance on termination resistors and voltage regulator
* Bus termination sensing
* Low power down capacitance of 3 pF
* Onboard thermal shutdown circuitry

DESCRIPTION
The DS1844 Quad Digital Potentiometer is a four-channel, digitally controlled linear potentiometer.
Each potentiometer is comprised of 63 equi-resistive sections and has three terminals accessible to the user.
These include the high side terminals, HX, the wiper terminals, WX, and the low-side terminals, LX.
The wiper position on the resistor ladder is selected via an 8-bit register value.
Communication and control of the device are supported by two types of serial interface.
These include a 5-wire I/O shift register interface and a 2-wire addressable interface.
The DS1844 is available in standard 10 k, 50 k, and 100 k versions.
Mixed resistor combinations are also available through custom setups.
The DS1844 is specified to operate over the industrial temperature range: -40C to +85C.
Packages for the DS1844 include 20-pin DIPs, SOICs, and TSSOPs.

FEATURES
* Four independent, digitally controlled 64-position potentiometers
* Two interface control options
- 5-wire serial
- 2-wire addressable
* Standard resistance values
- DS1844-010 10 k
- DS1844-050 50 k
- DS1844-100 100 k
* Mixed resistor value combinations (contact factory for availability)
* Operating Temperature Range
- Industrial: -40°C to +85°C

General Description
 The DS3030W consists of a static RAM, a nonvolatile (NV) controller, a year 2000-compliant real-time clock (RTC), and an internal rechargeable manganese lithium (ML) battery.
These components are encased in a surface- mount module with a 256-ball BGA footprint.
Whenever VCC is applied to the module, it recharges the ML battery, powers the clock and SRAM from the external power source, and allows the contents of the clock registers or SRAM to be modified.
When VCC is powered down or out-of-tolerance, the controller writeprotects the memory contents and powers the clock and SRAM from the battery.
The DS3030W also contains a power-supply monitor output (RST), as well as a user-programmable interrupt output (IRQ/FT).

Features
* Single-Piece, Reflowable, 27mm x 27mm BGA Package Footprint
* Internal Manganese Lithium Battery and Charger
* Integrated Real-Time Clock
* Unconditionally Write-Protects the Clock and SRAM when VCC is Out-of-Tolerance
* Automatically Switches to Battery Supply when VCC Power Failures Occur
* Reset Output can be Used as a CPU Supervisor
* Interrupt Output can be Used as a CPU Watchdog Timer
* Industrial Temperature Range (-40°C to +85°C)
* UL Recognized

Applications
* RAID Systems and Servers
* Gaming
* POS Terminals
* Fire Alarms
* Industrial Controllers
* PLCs
* Data-Acquisition Systems
* Routers/Switches

DS3030W-100