PDF STK25CA8 Data sheet ( Hoja de datos )

Número de pieza	STK25CA8
Descripción	128K x 8 AutoStore nvSRAM CMOS Nonvolatile Static RAM Module
Fabricantes	Simtek
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No Preview Available ! www.DataSheet4U.com STK25CA8 128K x 8 AutoStore™ nvSRAM QuantumTrap™ CMOS Nonvolatile Static RAM Module FEATURES • Nonvolatile Storage without Battery Problems • Directly Replaces 128K x 8 Static RAM, Battery- Backed RAM or EEPROM • 35ns and 45ns Access Times • STORE to EEPROM Initiated by AutoStore™ on Power Down • RECALL to SRAM on Power Restore • 22mA ICC at 200ns Cycle Time • Unlimited READ, WRITE and RECALL Cycles • 1,000,000 STORE Cycles to EEPROM • 100-Year Data Retention Over Full Commercial Temperature Range • Commercial and Industrial Temperatures • 32-Pin 600 mil Dual In-Line Module DESCRIPTION The Simtek STK25CA8 is a fast static RAM with a nonvolatile, electrically erasable PROM 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 EEPROM. Data transfers from the SRAM to the EEPROM (the STORE operation) can take place auto- matically on power down using charge stored in sys- tem capacitance. Transfers from the EEPROM to the SRAM (the RECALL operation) take place automati- cally on restoration of power. BLOCK DIAGRAM A15 MODULE A16 DECODER EEPROM ARRAY 512 x 512 A5 A6 STORE A7 A8 A9 STATIC RAM ARRAY RECALL A11 512 x 512 A12 A13 A14 DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7 COLUMN I/O COLUMN DEC A0 A1 A2 A3 A4 A10 STORE/ RECALL CONTROL VCC POWER CONTROL G E W PIN CONFIGURATIONS NC A16 A14 A12 A7 A6 A5 A4 A3 A2 A1 A0 DQ0 DQ1 DQ2 VSS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 32 VCC 31 A15 30 NC 29 W 28 A13 27 A8 26 A9 25 A11 24 G 23 A10 22 E 21 DQ7 20 19 DQ6 DQ5 32 - 600 mil 18 DQ4 Dual In-Line 17 DQ3 Module PIN NAMES A0 - A16 W Address Inputs Write Enable DQ0 - DQ7 E Data In/Out Chip Enable G Output Enable VCC VSS Power (+ 5V) Ground August 1999 6-1 1 page AutoStore™/POWER-UP RECALL SYMBOLS NO. Standard PARAMETER 22 tRESTORE 23 tSTORE 24 tDELAY 25 VSWITCH 26 VRESET Power-up RECALL Duration STORE Cycle Duration Time Allowed to Complete SRAM Cycle Low Voltage Trigger Level Low Voltage Reset Level Note k: tRESTORE starts from the time VCC rises above VSWITCH. AutoStore™/POWER-UP RECALL VCC 5V 25 VSWITCH 26 VRESET AutoStore™ POWER-UP RECALL W 22 tRESTORE DQ (DATA OUT) 24 tDELAY STK25CA8 (VCC = 5.0V 10%) STK25CA8 MIN MAX 550 10 1 4.0 4.5 UNITS NOTES µs k ms g µs g V 3.9 V 23 tSTORE POWER-UP BROWN OUT RECALL NO STORE DUE TO NO SRAM WRITES NO RECALL (VCC DID NOT GO BELOW VRESET) BROWN OUT AutoStore™ NO RECALL (VCC DID NOT GO BELOW VRESET) BROWN OUT AutoStore™ RECALL WHEN VCC RETURNS ABOVE VSWITCH August 1999 6-5 5 Page

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Número de pieza	Descripción	Fabricantes
STK25CA8	128K x 8 AutoStore nvSRAM CMOS Nonvolatile Static RAM Module	Simtek

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