DESCRIPTION
The Simtek STK10C48 is a fast static RAM with a nonvolatile element incorporated in each static memory cell. The SRAM can be read and written an unlimited number of times, while independent nonvolatile data resides in the Nonvolatile Elements. Data may easily be transferred from the SRAM to the Nonvolatile Elements (the STORE operation), or from the Nonvolatile Elements to the SRAM (the RECALL operation), using the NE pin. Transfers from the Nonvolatile Elements to the SRAM (the RECALL operation) also take place automatically on restoration of power. The STK10C48combines the high performance and ease of use of a fast SRAM with nonvolatile data integrity.
The STK10C48 features industry-standard pinout for nonvolatile RAMs.

FEATURES
*25ns, 35ns and 45ns Access Times
*STORE to Nonvolatile Elements Initiated by Hardware
*RECALL to SRAM Initiated by Hardware or Power Restore
*Automatic STORE Timing
*10mA Typical ICC at 200ns Cycle Time
*Unlimited READ, WRITE and RECALL Cycles
*1,000,000 STORE Cycles to Nonvolatile Elements
*100-Year Data Retention over Full Industrial Temperature Range
*Commercial and Industrial Temperatures
*28-Pin 300 mil PDIP, 300 mil SOIC and 350 mil SOIC Packages

STK10C48-PF25I, STK10C48-NF25I, STK10C48-SF25I, STK10C48-P25I

DESCRIPTION
The Simtek STK14D88 is a 256Kb fast static RAM with a non-volatile Quantum Trap storage element included with each memory cell.
The SRAM provides the fast access & cycle times, ease of use and unlimited read & write endurance of a normal SRAM.
Data transfers automatically to the non-volatile storage cells when power loss is detected (the STOREoperation). On power up, data is automatically restored to the SRAM (the RECALL operation). Both STORE and RECALL operations are also available under software control.
The Simtek nvSRAM is the first monolithic non-volatile memory to offer unlimited writes and reads. It is the highest performance, most reliable non-volatile memory available.

FEATURES
*25, 35, 45 ns Read Access & R/W Cycle Time
*Unlimited Read/Write Endurance
*Automatic Non-volatile STORE on Power Loss
*Non-Volatile STORE Under Hardware or Software Control
*Automatic RECALL to SRAM on Power Up
*Unlimited RECALL Cycles
*200K STORE Cycles
*20-Year Non-volatile Data Retention
*Single 3V +20%, -10% Power Supply
*Commercial, Industrial Temperatures
*Small Footprint SOIC & SSOP Packages (RoHS-Compliant

STK14D88-NF45ITR, STK14D88-RF45ITR, STK14D88-NF35ITR

DESCRIPTION
The Simtek STK10C68 is a fast static RAM with a nonvolatile element incorporated in each static memory cell. The SRAM can be read and written an unlimited number of times, while independent nonvolatile data resides in Nonvolatile Elements. Data may easily be transferred from the SRAM to the Nonvolatile Elements (the STORE operation), or from the Nonvolatile Elements to the SRAM(the RECALL operation), using the NE pin. Transfers from the Nonvolatile Elements to the SRAM (the RECALL operation) also take place automatically on restoration of power. The STK10C68 combines the high performance and ease of use of a fast SRAM with nonvolatile data integrity.
The STK10C68 features industry-standard pinout for nonvolatile RAMs. MIL-STD-883 and Standard Military Drawing (SMD #5962-93056) devices are available.

FEATURES
*25ns, 35ns, 45ns and 55ns Access Times
*STORE to Nonvolatile Elements Initiated by Hardware
*RECALL to SRAM Initiated by Hardware or Power Restore
*Automatic STORE Timing
*10mA Typical ICC at 200ns Cycle Time
*Unlimited READ, WRITE and RECALL Cycles
*1,000,000 STORE Cycles to Nonvolatile Elements (Industrial/Commercial)
*100-Year Data Retention (Industrial/Commercial)
*Commercial, Industrial and Military Temperatures
*28-Pin DIP, SOIC and LCC Packages

STK10C68-5PF25M, STK10C68-PF25M, STK10C68-5SF25M, STK10C68-SF25M

DESCRIPTION
The STK25C48 is a fast SRAM with a nonvolatile element incorporated in each static memory cell. The SRAM can be read and written an unlimited number of times, while independent nonvolatile data resides in the Nonvolatile Elements. Data transfers from the SRAM to the Nonvolatile Elements (the STORE operation) can take place automatically on power down using charge stored in system capacitance. Transfers from the Nonvolatile Elements to the SRAM (the RECALL operation) take place automatically on restoration of power. The nvSRAM can be used in place of existing 2K x 8 SRAMs and also matches the pinout of 2K x 8 battery-backed SRAMs, EPROMs and EEPROMs, allowing direct substitution while enhancing performance. No support circuitry is required for microprocessor interfacing.

FEATURES
*Nonvolatile Storage without Battery Problems
*Directly Replaces 2K x 8 Static RAM, Battery- Backed RAM or EEPROMs
*25ns, 35ns and 45ns Access Times
*STORE to Nonvolatile Elements Initiated by AutoStore™ on Power Down
*RECALL to SRAM Initiated by Power Restore
*10mA Typical ICC at 200ns Cycle Time
*Unlimited READ, WRITE and RECALL Cycles
*1,000,000 STORE Cycles to Nonvolatile Elements
*100-Year Data Retention over Full Industrial Temperature Range
*Commercial and Industrial Temperatures
*24-Pin 600 PDIP Package

STK22C48-WF25I, STK22C48-W25I, STK22C48-WF45I, STK22C48-W45I

DESCRIPTION
The Simtek STK16CA8 is a fast static RAM with a nonvolatile element in each static memory cell. The embedded nonvolatile elements incorporate Simtek’s QuantumTrap™ technology producing the world’s most reliable nonvolatile memory. The SRAM provides unlimited read and write cycles, while independent, nonvolatile data resides in the nonvolatile elements. Data transfers from the SRAM to the nonvolatile elements (the STORE operation) can take place automatically on power down or under software control. An internal capacitor guarantees the STORE operation, even under extreme power-down slew rates or loss of power from “hot swapping”. Transfers from the nonvolatile elements to the SRAM (the RECALL operation) take place automatically on restoration of power. Initiation of STORE and RECALL cycles can also be controlled by entering control sequences on the SRAM inputs. The STK16CA8 is pin-compatible with 128k x 8 SRAMs and batterybacked SRAMs, allowing direct substitution while providing superior performance.

FEATURES
*25ns, 35ns and 45ns Access Times
*Directly Replaces 128K x 8 Static RAM, Battery-Backed RAM or EEPROM
*Transparent Data Save on Power Down
*STORE to QuantumTrap™ Nonvolatile Elements is Initiated by Software or AutoStore-Plus™on Power Down
*RECALL to SRAM Initiated by Software or Power Restore
*5mA Typical ICC at 200ns Cycle Time
*Unlimited READ and WRITE Cycles to SRAM
*100-Year Data Retention to Quantum Trap
*Single 3V +20%, -10% Operation
*Commercial and Industrial Temperatures
*32-Pin DIP Package

STK16CA8-WF45I, STK16CA8-W45I, STK16CA8-WF35I, STK16CA8-W35I

DESCRIPTION
The Simtek STK14C88-3 is a 256Kb fast static RAM with a non-volatile Quantum Trap storage element included with each memory cell.
The SRAM provides the fast access & cycle times, ease of use and unlimited read & write endurance of a normal SRAM.
Data transfers automatically to the non-volatile storage cells when power loss is detected (the STORE operation). On power up, data is automatically restored to the SRAM (the RECALL operation). Both STORE and RECALL operations are also available under software control.
The Simtek nvSRAM is the first monolithic non-volatile memory to offer unlimited writes and reads. It is the highest performance, most reliable non-volatile memory available.

FEATURES
*35, 45 ns Read Access & R/W Cycle Time
*Unlimited Read/Write Endurance
*Automatic Non-volatile STORE on Power Loss
*Non-Volatile STORE Under Hardware or Software Control
*Automatic RECALL to SRAM on Power Up
*Unlimited RECALL Cycles
*1 Million STORE Cycles
*100-Year Non-volatile Data Retention
*Single 3.3V +0.3V Power Supply
*Commercial and Industrial Temperatures
*32-Pin 300 mil SOIC and 600 mil PDIP Packages (RoHS-Compliant)

STK14C88-3WF35, STK14C88-3WF45, STK14C88-3NF35, STK14C88-3NF45

DESCRIPTION
The Simtek STK14CA8 is a 1Mb fast static RAM with a non-volatile Quantum Trap storage element included with each memory cell.
The SRAM provides the fast access & cycle times, ease of use and unlimited read & write endurance of a normal SRAM.
Data transfers automatically to the non-volatile storage cells when power loss is detected (the STOREoperation). On power up, data is automatically restored to the SRAM (the RECALL operation). Both STORE and RECALL operations are also available under software control.
The Simtek nvSRAM is the first monolithic non-volatile memory to offer unlimited writes and reads. It is the highest performance, most reliable non-volatile memory available.

FEATURES
*25, 35, 45 ns Read Access & R/W Cycle Time
*Unlimited Read/Write Endurance
*Automatic Non-volatile STORE on Power Loss
*Non-Volatile STORE Under Hardware or Software Control
*Automatic RECALL to SRAM on Power Up
*Unlimited RECALL Cycles
*200K STORE Cycles
*20-Year Non-volatile Data Retention
*Single 3.0V + 20%, -10% Operation
*Commercial and Industrial Temperatures
*Small Footprint SOIC & SSOP Packages (RoHS-Compliant)

STK14CA8-NF35, STK14CA8-NF45, STK14CA8-NF25TR, STK14CA8-NF35TR, STK14CA8-NF45TR

DESCRIPTION
The Simtek STK14C88 is a 256Kb fast static RAM with a non-volatile Quantum Trap storage element included with each memory cell.
The SRAM provides the fast access & cycle times, ease of use and unlimited read & write endurance of a normal SRAM.
Data transfers automatically to the non-volatile storage cells when power loss is detected (the STORE operation). On power up, data is automatically restored to the SRAM (the RECALL operation). Both STORE and RECALL operations are also available under software control.
The Simtek nvSRAM is the first monolithic non-volatile memory to offer unlimited writes and reads. It is the highest performance, most reliable non-volatile memory available.

FEATURES
*25, 35, 45 ns Read Access & R/W Cycle Time
*Unlimited Read/Write Endurance
*Automatic Non-volatile STORE on Power Loss
*Non-Volatile STORE Under Hardware or Software Control
*Automatic RECALL to SRAM on Power Up
*Unlimited RECALL Cycles
*1 Million STORE Cycles
*100-Year Non-volatile Data Retention
*Single 5V +10% Power Supply
*Commercial, Industrial, Military Temperatures
*32-Pin 300 mil SOIC (RoHS-Compliant)
*32-pin CDIP and LCC Packages

STK14C88NF25ITR, STK14C88CF25ITR, STK14C88LF25ITR

Description
The UL635H256 has two separate modes of operation:
SRAM mode and nonvolatile mode.
In SRAM mode, the memory operates as an ordinary static RAM.
In nonvolatile operation, data is transferred in parallel from SRAM to EEPROM or from EEPROM to SRAM.
In this mode SRAM functions are disabled.
The UL635H256 is a fast static RAM (35 and 45 ns), with a nonvolatile electrically erasable PROM (EEPROM) element incorporated in each static memory cell.
The SRAM can be read and written an unlimited number of times, while independent nonvolatile data resides in EEPROM.
Data transfers from the SRAM to the EEPROM (the STORE operation) take place automatically upon power down using charge stored in system capacitance.
Transfers from the EEPROM to the SRAM (the RECALL operation) take place automatically on powerup.
The UL635H256 combines the high performance and ease of use of a fast SRAM with nonvolatile data integrity.
STORE cycles also may be initiated under user control via a software sequence.
Once a STORE cycle is initiated, further input or output are disabled until the cycle is completed.
Because a sequence of addresses is used for STORE initiation, it is important that no other read or write accesses intervene in the sequence or the sequence will be aborted.
RECALL cycles may also be initiated by a software sequence.
Internally, RECALL is a two step procedure.
First, the SRAM data is cleared and second, the nonvolatile information is transferred into the SRAM cells.
The RECALL operation in no way alters the data in the EEPROM cells.
The nonvolatile data can be recalled an unlimited number of times.

Features
*High-performance CMOS nonvolatile static RAM 32768 x 8 bits
*35 and 45 ns Access Times
*15 and 20 ns Output Enable Access Times
*ICC = 8 mA typ. at 200 ns Cycle Time
*Automatic STORE to EEPROM on Power Down using system capacitance
*Software initiated STORE
*Automatic STORE Timing
*106 STORE cycles to EEPROM
*100 years data retention in EEPROM
*Automatic RECALL on Power Up
*Software RECALL Initiation
*Unlimited RECALL cycles from EEPROM
*Wide voltage range: 2.7 ... 3.6 V (3.0 ... 3.6 V for 35 ns type)
*Operating temperature range: 0 to 70 °C
                                          -40 to 85 °C
*QS 9000 Quality Standard
*ESD protection > 2000 V (MIL STD 883C M3015.7-HBM)
*RoHS compliance and Pb- free
*Package:SOP28 (330 mil)


UL635H256SK45
UL635H256S2C35G1
UL635H256S2C45G1

DESCRIPTION
The Simtek STK22C48 is a 16Kb fast static RAM with a nonvolatile Quantum Trap storage element included with each memory cell.
The SRAM provides the fast access & cycle times, ease of use, and unlimited read & write endurance of a normal SRAM.
Data transfers automatically to the non-volatile storage cells when power loss is detected (the STOREoperation).
On power-up, data is automatically restored to the SRAM (the RECALL operation).
Both STORE and RECALL operations are also available under software control.
The Simtek nvSRAM is the first monolithic non-volatile memory to offer unlimited writes and reads.
It is the highest-performance, most reliable non-volatile memory available.

FEATURES
* 25, 45 ns Read Access & R/W Cycle Times
* Unlimited Read/Write Endurance
* Automatic Non-Volatile STORE on Power Loss
* Non-Volatile STORE Under Hardware Control
* Automatic RECALL to SRAM on Power Up
* Unlimited RECALL Cycles
* 1 Million STORE Cycles
* 100-Year Non-volatile Data Retention
* Single 5.0V +10% Operation
* Commercial, Industrial, and Military Temperatures
* 28-Pin 300 mil SOIC or 330 mil SOIC (RoHS-Compliant)