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Cypress Semiconductor Perform STK16C88-3 Manual

256 kbit (32k x 8) autostore+ nvsram
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Features
■
Fast 35ns Read access and R/W cycle time
■
Directly replaces battery-backed SRAM modules such as
Dallas/Maxim DS1230W
■
Automatic nonvolatile STORE on power loss
■
Nonvolatile STORE under Software control
■
Automatic RECALL to SRAM on power up
■
Unlimited Read/Write endurance
■
1,000,000 STORE cycles
■
100 year data retention
■
Single 3.3V+0.3V power supply
■
Commercial and Industrial Temperatures
■
28-pin (600 mil) PDIP package
■
RoHS compliance
Logic Block Diagram
Cypress Semiconductor Corporation
Document Number: 001-50594 Rev. **
256 Kbit (32K x 8) AutoStore+ nvSRAM

Functional Description

The Cypress STK16C88-3 is a 256Kb fast static RAM with a
nonvolatile element in each memory cell. The embedded
nonvolatile elements incorporate QuantumTrap
producing the world's most reliable nonvolatile memory. The
SRAM provides unlimited read and write cycles, while
independent, nonvolatile data resides in the highly reliable
QuantumTrap cell. Data transfers from the SRAM to the
nonvolatile elements (the STORE operation) takes place
automatically at power down. On power up, data is restored to
the SRAM (the RECALL operation) from the nonvolatile
memory. Both the STORE and RECALL operations are also
available under software control.
•
198 Champion Court
,
•
San Jose
CA 95134-1709
STK16C88-3
™
technology
•
408-943-2600
Revised January 29, 2009
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Summary of Contents for Cypress Semiconductor Perform STK16C88-3

  • Page 1: Functional Description

    Features ■ Fast 35ns Read access and R/W cycle time ■ Directly replaces battery-backed SRAM modules such as Dallas/Maxim DS1230W ■ Automatic nonvolatile STORE on power loss ■ Nonvolatile STORE under Software control ■ Automatic RECALL to SRAM on power up ■...

  • Page 2: Pin Configurations

    Pin Configurations Table 1. Pin Definitions - 28-Pin PDIP Pin Name IO Type –A Input Address Inputs. Used to select one of the 32,768 bytes of the nvSRAM. Input or Bidirectional Data IO lines. Used as input or output lines depending on operation. Output Input Write Enable Input, Active LOW.
  • Page 3 Device Operation The AutoStore+ STK16C88-3 is a fast 32K x 8 SRAM that does not lose its data on power down. The data is preserved in integral QuantumTrap non-volatile storage elements when power is lost. Automatic STORE on power down and automatic RECALL on power up guarantee data integrity without the use of batteries.

  • Page 4: Noise Considerations

    Hardware Protect STK16C88-3 offers hardware inadvertent STORE operation and SRAM WRITEs during low voltage conditions. When V <V initiated STORE operations and SRAM WRITEs are inhibited. Noise Considerations The STK16C88-3 is a high speed memory. It must have a high frequency bypass capacitor of approximately 0.1 µF connected between V and V...
  • Page 5 Table 2. Software STORE/RECALL Mode Selection Notes 1. The six consecutive addresses must be in the order listed. WE must be high during all six consecutive CE controlled cycles to enable a nonvolatile cycle. 2. While there are 15 addresses on the STK16C88-3, only the lower 14 are used to control software modes. Document Number: 001-50594 Rev.

  • Page 6: Maximum Ratings

    Maximum Ratings Exceeding maximum ratings may shorten the useful life of the device. These user guidelines are not tested. Storage Temperature ... –65°C to +150°C Temperature under bias ... –55°C to +125°C Supply Voltage on V Relative to GND... –0.5V to 4.5V Voltage on Input Relative to Vss ...–0.6V to V DC Electrical Characteristics Over the operating range (V...

  • Page 7: Thermal Resistance

    Capacitance In the following table, the capacitance parameters are listed. Parameter Description Input Capacitance Output Capacitance Thermal Resistance In the following table, the thermal resistance parameters are listed. Parameter Description Θ Thermal Resistance (Junction to Ambient) Θ Thermal Resistance (Junction to Case) Output AC Test Conditions Input Pulse Levels ...

  • Page 8: Switching Waveforms

    AC Switching Characteristics SRAM Read Cycle Parameter Cypress Parameter ELQV AVAV, ELEH AVQV GLQV AXQX LZCE ELQX HZCE EHQZ LZOE GLQX HZOE GHQZ ELICCH [3, 4] EHICCL Switching Waveforms Figure 5. SRAM Read Cycle 1: Address Controlled Figure 6. SRAM Read Cycle 2: CE and OE Controlled Notes 5.
  • Page 9 Table 3. SRAM Write Cycle Parameter Cypress Parameter AVAV WLWH, WLEH ELWH, ELEH DVWH, DVEH WHDX, EHDX AVWH, AVEH AVWL, AVEL WHAX, EHAX [7,8] HZWE WLQZ LZWE WHQX Switching Waveforms Figure 7. SRAM Write Cycle 1: WE Controlled ADDRESS DATA IN DATA OUT PREVIOUS DATA Figure 8.
  • Page 10 AutoStorePlus or Power Up RECALL Parameter [10] Power up RECALL Duration HRECALL RESTORE STORE Cycle Duration STORE HLHZ [4, 6] Power-down AutoStore Slew Time to Ground Low Voltage Reset Level RESET Low Voltage Trigger Level SWITCH Switching Waveforms Notes 10. t starts from the time V rises above V HRECALL...
  • Page 11 Software Controlled STORE/RECALL Cycle The software controlled STORE/RECALL cycle follows. Parameter AVAV [11] AVEL [11] ELEH [7, 11] HACE ELAX RECALL Switching Waveforms Figure 10. CE Controlled Software STORE/RECALL Cycle ADDRESS HACE DATA VALID DQ (DATA) Notes 11. The software sequence is clocked on the falling edge of CE without involving OE (double clocking will abort the sequence). 12.

  • Page 12: Part Numbering Nomenclature

    Part Numbering Nomenclature STK16C88 - 3W F 35 I Ordering Information Speed (ns) Ordering Code STK16C88-3WF35 STK16C88-3WF35I All parts are Pb-free. The above table contains Final information. Please contact your local Cypress sales representative for availability of these parts Document Number: 001-50594 Rev. ** Temperature Range: Blank - Commercial (0 to 70°C) I - Industrial (-40 to 85°C)

  • Page 13: Package Diagrams

    STK16C88-3 Package Diagrams Figure 11. 28-Pin (600 Mil) PDIP (51-85017) 51-85017 *B Document Number: 001-50594 Rev. ** Page 13 of 14 [+] Feedback...
  • Page 14 Document History Page Document Title: STK16C88-3 256 Kbit (32K x 8) AutoStore+ nvSRAM Document Number: 001-50594 Orig. of Rev. ECN No. Change 2625096 GVCH/PYRS Sales, Solutions and Legal Information Worldwide Sales and Design Support Cypress maintains a worldwide network of offices, solution centers, manufacturer’s representatives, and distributors. To find the office closest to you, visit us at cypress.com/sales.

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