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

 

DS5000FP - Soft Microprocessor Chip

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  

DS2251T - 128K Soft Microcontroller Module

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

 

DS2109 - Plug and Play SCSI Terminator

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  

DS1844 - Quad Digital Potentiometer

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

 

DS3030W - 3.3V Single-Piece 256kb Nonvolatile SRAM with Clock